./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/systemc/kundu2.cil.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 6b4ec56b Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55086e4b-0151-4ce4-8f08-839021d90a66/bin/utaipan-6cKwYrpEi9/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55086e4b-0151-4ce4-8f08-839021d90a66/bin/utaipan-6cKwYrpEi9/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55086e4b-0151-4ce4-8f08-839021d90a66/bin/utaipan-6cKwYrpEi9/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55086e4b-0151-4ce4-8f08-839021d90a66/bin/utaipan-6cKwYrpEi9/config/TaipanReach.xml -i ../../sv-benchmarks/c/systemc/kundu2.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55086e4b-0151-4ce4-8f08-839021d90a66/bin/utaipan-6cKwYrpEi9/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55086e4b-0151-4ce4-8f08-839021d90a66/bin/utaipan-6cKwYrpEi9 --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 87760fc84dfa44e1b5109b35af0fae7e5f68f814afbb1ba90e7b46e4e9e3b4bf --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-6b4ec56 [2022-11-20 20:08:39,017 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-20 20:08:39,022 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-20 20:08:39,051 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-20 20:08:39,055 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-20 20:08:39,060 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-20 20:08:39,066 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-20 20:08:39,069 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-20 20:08:39,072 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-20 20:08:39,075 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-20 20:08:39,077 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-20 20:08:39,080 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-20 20:08:39,081 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-20 20:08:39,088 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-20 20:08:39,089 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-20 20:08:39,093 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-20 20:08:39,094 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-20 20:08:39,096 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-20 20:08:39,098 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-20 20:08:39,100 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-20 20:08:39,105 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-20 20:08:39,107 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-20 20:08:39,108 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-20 20:08:39,109 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-20 20:08:39,112 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-20 20:08:39,112 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-20 20:08:39,113 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-20 20:08:39,113 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-20 20:08:39,114 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-20 20:08:39,115 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-20 20:08:39,115 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-20 20:08:39,116 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-20 20:08:39,117 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-20 20:08:39,118 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-20 20:08:39,122 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-20 20:08:39,126 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-20 20:08:39,128 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-20 20:08:39,128 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-20 20:08:39,128 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-20 20:08:39,130 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-20 20:08:39,131 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-20 20:08:39,132 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55086e4b-0151-4ce4-8f08-839021d90a66/bin/utaipan-6cKwYrpEi9/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-20 20:08:39,177 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-20 20:08:39,178 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-20 20:08:39,178 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-20 20:08:39,179 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-20 20:08:39,179 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-20 20:08:39,180 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-20 20:08:39,180 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-20 20:08:39,180 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-20 20:08:39,180 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-20 20:08:39,180 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-20 20:08:39,182 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-20 20:08:39,182 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-20 20:08:39,182 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-20 20:08:39,182 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-20 20:08:39,182 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-20 20:08:39,183 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-20 20:08:39,183 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-20 20:08:39,183 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-20 20:08:39,184 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-20 20:08:39,184 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-20 20:08:39,184 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-20 20:08:39,184 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-20 20:08:39,184 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-20 20:08:39,185 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-20 20:08:39,185 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-20 20:08:39,185 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-20 20:08:39,186 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-20 20:08:39,186 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-20 20:08:39,186 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-20 20:08:39,186 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-20 20:08:39,186 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-20 20:08:39,187 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-20 20:08:39,187 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-20 20:08:39,187 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-20 20:08:39,187 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-20 20:08:39,188 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-20 20:08:39,188 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-20 20:08:39,188 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-20 20:08:39,188 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-20 20:08:39,188 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-20 20:08:39,188 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-20 20:08:39,189 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55086e4b-0151-4ce4-8f08-839021d90a66/bin/utaipan-6cKwYrpEi9/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55086e4b-0151-4ce4-8f08-839021d90a66/bin/utaipan-6cKwYrpEi9 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 87760fc84dfa44e1b5109b35af0fae7e5f68f814afbb1ba90e7b46e4e9e3b4bf [2022-11-20 20:08:39,534 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-20 20:08:39,570 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-20 20:08:39,573 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-20 20:08:39,574 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-20 20:08:39,575 INFO L275 PluginConnector]: CDTParser initialized [2022-11-20 20:08:39,576 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55086e4b-0151-4ce4-8f08-839021d90a66/bin/utaipan-6cKwYrpEi9/../../sv-benchmarks/c/systemc/kundu2.cil.c [2022-11-20 20:08:42,663 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-20 20:08:42,891 INFO L351 CDTParser]: Found 1 translation units. [2022-11-20 20:08:42,891 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55086e4b-0151-4ce4-8f08-839021d90a66/sv-benchmarks/c/systemc/kundu2.cil.c [2022-11-20 20:08:42,905 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55086e4b-0151-4ce4-8f08-839021d90a66/bin/utaipan-6cKwYrpEi9/data/ded2c33ea/a96a0073635645b5b959e4f15d71f194/FLAG58db56bcc [2022-11-20 20:08:42,921 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55086e4b-0151-4ce4-8f08-839021d90a66/bin/utaipan-6cKwYrpEi9/data/ded2c33ea/a96a0073635645b5b959e4f15d71f194 [2022-11-20 20:08:42,923 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-20 20:08:42,925 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-20 20:08:42,926 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-20 20:08:42,926 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-20 20:08:42,930 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-20 20:08:42,931 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 08:08:42" (1/1) ... [2022-11-20 20:08:42,932 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1e1b518d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:08:42, skipping insertion in model container [2022-11-20 20:08:42,932 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 08:08:42" (1/1) ... [2022-11-20 20:08:42,940 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-20 20:08:42,985 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-20 20:08:43,170 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55086e4b-0151-4ce4-8f08-839021d90a66/sv-benchmarks/c/systemc/kundu2.cil.c[636,649] [2022-11-20 20:08:43,230 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-20 20:08:43,241 INFO L203 MainTranslator]: Completed pre-run [2022-11-20 20:08:43,253 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55086e4b-0151-4ce4-8f08-839021d90a66/sv-benchmarks/c/systemc/kundu2.cil.c[636,649] [2022-11-20 20:08:43,282 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-20 20:08:43,298 INFO L208 MainTranslator]: Completed translation [2022-11-20 20:08:43,298 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:08:43 WrapperNode [2022-11-20 20:08:43,299 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-20 20:08:43,300 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-20 20:08:43,300 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-20 20:08:43,300 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-20 20:08:43,308 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:08:43" (1/1) ... [2022-11-20 20:08:43,316 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:08:43" (1/1) ... [2022-11-20 20:08:43,358 INFO L138 Inliner]: procedures = 34, calls = 40, calls flagged for inlining = 17, calls inlined = 17, statements flattened = 310 [2022-11-20 20:08:43,362 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-20 20:08:43,363 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-20 20:08:43,364 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-20 20:08:43,364 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-20 20:08:43,374 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:08:43" (1/1) ... [2022-11-20 20:08:43,375 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:08:43" (1/1) ... [2022-11-20 20:08:43,388 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:08:43" (1/1) ... [2022-11-20 20:08:43,398 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:08:43" (1/1) ... [2022-11-20 20:08:43,403 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:08:43" (1/1) ... [2022-11-20 20:08:43,422 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:08:43" (1/1) ... [2022-11-20 20:08:43,424 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:08:43" (1/1) ... [2022-11-20 20:08:43,425 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:08:43" (1/1) ... [2022-11-20 20:08:43,428 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-20 20:08:43,429 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-20 20:08:43,429 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-20 20:08:43,429 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-20 20:08:43,430 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:08:43" (1/1) ... [2022-11-20 20:08:43,443 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-20 20:08:43,455 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55086e4b-0151-4ce4-8f08-839021d90a66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:08:43,480 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55086e4b-0151-4ce4-8f08-839021d90a66/bin/utaipan-6cKwYrpEi9/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-20 20:08:43,512 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55086e4b-0151-4ce4-8f08-839021d90a66/bin/utaipan-6cKwYrpEi9/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-20 20:08:43,536 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-20 20:08:43,536 INFO L130 BoogieDeclarations]: Found specification of procedure write_data [2022-11-20 20:08:43,536 INFO L138 BoogieDeclarations]: Found implementation of procedure write_data [2022-11-20 20:08:43,536 INFO L130 BoogieDeclarations]: Found specification of procedure error [2022-11-20 20:08:43,537 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2022-11-20 20:08:43,537 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2022-11-20 20:08:43,537 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2022-11-20 20:08:43,537 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2022-11-20 20:08:43,537 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2022-11-20 20:08:43,537 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2022-11-20 20:08:43,537 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2022-11-20 20:08:43,538 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2022-11-20 20:08:43,538 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2022-11-20 20:08:43,538 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-20 20:08:43,538 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2022-11-20 20:08:43,538 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2022-11-20 20:08:43,538 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-20 20:08:43,538 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-20 20:08:43,654 INFO L235 CfgBuilder]: Building ICFG [2022-11-20 20:08:43,657 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-20 20:08:44,118 INFO L276 CfgBuilder]: Performing block encoding [2022-11-20 20:08:44,263 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-20 20:08:44,263 INFO L300 CfgBuilder]: Removed 5 assume(true) statements. [2022-11-20 20:08:44,266 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 08:08:44 BoogieIcfgContainer [2022-11-20 20:08:44,266 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-20 20:08:44,269 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-20 20:08:44,269 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-20 20:08:44,273 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-20 20:08:44,273 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 08:08:42" (1/3) ... [2022-11-20 20:08:44,274 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@32192e0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 08:08:44, skipping insertion in model container [2022-11-20 20:08:44,274 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:08:43" (2/3) ... [2022-11-20 20:08:44,275 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@32192e0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 08:08:44, skipping insertion in model container [2022-11-20 20:08:44,275 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 08:08:44" (3/3) ... [2022-11-20 20:08:44,276 INFO L112 eAbstractionObserver]: Analyzing ICFG kundu2.cil.c [2022-11-20 20:08:44,296 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-20 20:08:44,296 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-20 20:08:44,349 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-20 20:08:44,356 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@4a5036e6, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-20 20:08:44,357 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-20 20:08:44,362 INFO L276 IsEmpty]: Start isEmpty. Operand has 93 states, 66 states have (on average 1.4848484848484849) internal successors, (98), 70 states have internal predecessors, (98), 18 states have call successors, (18), 7 states have call predecessors, (18), 7 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2022-11-20 20:08:44,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-11-20 20:08:44,372 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:08:44,373 INFO L195 NwaCegarLoop]: 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] [2022-11-20 20:08:44,373 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:08:44,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:08:44,383 INFO L85 PathProgramCache]: Analyzing trace with hash -122069048, now seen corresponding path program 1 times [2022-11-20 20:08:44,395 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:08:44,396 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [666763999] [2022-11-20 20:08:44,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:08:44,397 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:08:44,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:08:44,712 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:08:44,713 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:08:44,713 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [666763999] [2022-11-20 20:08:44,714 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [666763999] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:08:44,714 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:08:44,714 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-20 20:08:44,716 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2052457139] [2022-11-20 20:08:44,716 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:08:44,721 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-20 20:08:44,721 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:08:44,748 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-20 20:08:44,749 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-20 20:08:44,752 INFO L87 Difference]: Start difference. First operand has 93 states, 66 states have (on average 1.4848484848484849) internal successors, (98), 70 states have internal predecessors, (98), 18 states have call successors, (18), 7 states have call predecessors, (18), 7 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) Second operand has 4 states, 4 states have (on average 6.75) internal successors, (27), 4 states have internal predecessors, (27), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-11-20 20:08:45,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:08:45,122 INFO L93 Difference]: Finished difference Result 263 states and 388 transitions. [2022-11-20 20:08:45,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-20 20:08:45,137 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.75) internal successors, (27), 4 states have internal predecessors, (27), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 39 [2022-11-20 20:08:45,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:08:45,181 INFO L225 Difference]: With dead ends: 263 [2022-11-20 20:08:45,181 INFO L226 Difference]: Without dead ends: 171 [2022-11-20 20:08:45,185 INFO L412 NwaCegarLoop]: 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 [2022-11-20 20:08:45,188 INFO L413 NwaCegarLoop]: 204 mSDtfsCounter, 226 mSDsluCounter, 144 mSDsCounter, 0 mSdLazyCounter, 134 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 226 SdHoareTripleChecker+Valid, 348 SdHoareTripleChecker+Invalid, 141 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 20:08:45,189 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [226 Valid, 348 Invalid, 141 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 134 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-20 20:08:45,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2022-11-20 20:08:45,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 165. [2022-11-20 20:08:45,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 123 states have (on average 1.4390243902439024) internal successors, (177), 127 states have internal predecessors, (177), 29 states have call successors, (29), 13 states have call predecessors, (29), 12 states have return successors, (26), 25 states have call predecessors, (26), 26 states have call successors, (26) [2022-11-20 20:08:45,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 232 transitions. [2022-11-20 20:08:45,321 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 232 transitions. Word has length 39 [2022-11-20 20:08:45,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:08:45,321 INFO L495 AbstractCegarLoop]: Abstraction has 165 states and 232 transitions. [2022-11-20 20:08:45,322 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 6.75) internal successors, (27), 4 states have internal predecessors, (27), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-11-20 20:08:45,322 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 232 transitions. [2022-11-20 20:08:45,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-11-20 20:08:45,324 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:08:45,324 INFO L195 NwaCegarLoop]: 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] [2022-11-20 20:08:45,325 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-20 20:08:45,325 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:08:45,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:08:45,326 INFO L85 PathProgramCache]: Analyzing trace with hash -1093743735, now seen corresponding path program 1 times [2022-11-20 20:08:45,326 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:08:45,326 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1797305192] [2022-11-20 20:08:45,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:08:45,332 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:08:45,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:08:45,520 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:08:45,521 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:08:45,521 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1797305192] [2022-11-20 20:08:45,521 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1797305192] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:08:45,521 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:08:45,521 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-20 20:08:45,522 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [453307234] [2022-11-20 20:08:45,522 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:08:45,523 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-20 20:08:45,523 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:08:45,524 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-20 20:08:45,524 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-20 20:08:45,524 INFO L87 Difference]: Start difference. First operand 165 states and 232 transitions. Second operand has 4 states, 4 states have (on average 6.75) internal successors, (27), 4 states have internal predecessors, (27), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-11-20 20:08:45,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:08:45,842 INFO L93 Difference]: Finished difference Result 480 states and 677 transitions. [2022-11-20 20:08:45,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-20 20:08:45,842 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.75) internal successors, (27), 4 states have internal predecessors, (27), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 39 [2022-11-20 20:08:45,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:08:45,855 INFO L225 Difference]: With dead ends: 480 [2022-11-20 20:08:45,856 INFO L226 Difference]: Without dead ends: 320 [2022-11-20 20:08:45,864 INFO L412 NwaCegarLoop]: 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 [2022-11-20 20:08:45,866 INFO L413 NwaCegarLoop]: 190 mSDtfsCounter, 221 mSDsluCounter, 130 mSDsCounter, 0 mSdLazyCounter, 144 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 221 SdHoareTripleChecker+Valid, 320 SdHoareTripleChecker+Invalid, 152 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 144 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 20:08:45,869 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [221 Valid, 320 Invalid, 152 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 144 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-20 20:08:45,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 320 states. [2022-11-20 20:08:45,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 320 to 301. [2022-11-20 20:08:45,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 301 states, 225 states have (on average 1.3911111111111112) internal successors, (313), 230 states have internal predecessors, (313), 51 states have call successors, (51), 25 states have call predecessors, (51), 24 states have return successors, (48), 46 states have call predecessors, (48), 48 states have call successors, (48) [2022-11-20 20:08:45,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 301 states to 301 states and 412 transitions. [2022-11-20 20:08:45,922 INFO L78 Accepts]: Start accepts. Automaton has 301 states and 412 transitions. Word has length 39 [2022-11-20 20:08:45,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:08:45,922 INFO L495 AbstractCegarLoop]: Abstraction has 301 states and 412 transitions. [2022-11-20 20:08:45,923 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 6.75) internal successors, (27), 4 states have internal predecessors, (27), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-11-20 20:08:45,923 INFO L276 IsEmpty]: Start isEmpty. Operand 301 states and 412 transitions. [2022-11-20 20:08:45,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-11-20 20:08:45,924 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:08:45,924 INFO L195 NwaCegarLoop]: 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] [2022-11-20 20:08:45,924 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-20 20:08:45,925 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:08:45,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:08:45,926 INFO L85 PathProgramCache]: Analyzing trace with hash 1806477916, now seen corresponding path program 1 times [2022-11-20 20:08:45,926 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:08:45,926 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [933253766] [2022-11-20 20:08:45,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:08:45,926 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:08:45,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:08:46,173 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:08:46,174 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:08:46,175 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [933253766] [2022-11-20 20:08:46,175 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [933253766] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:08:46,177 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:08:46,177 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-20 20:08:46,178 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1597909869] [2022-11-20 20:08:46,178 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:08:46,180 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-20 20:08:46,180 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:08:46,181 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-20 20:08:46,181 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-20 20:08:46,182 INFO L87 Difference]: Start difference. First operand 301 states and 412 transitions. Second operand has 5 states, 5 states have (on average 5.6) internal successors, (28), 4 states have internal predecessors, (28), 2 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2022-11-20 20:08:46,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:08:46,389 INFO L93 Difference]: Finished difference Result 801 states and 1098 transitions. [2022-11-20 20:08:46,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-20 20:08:46,390 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.6) internal successors, (28), 4 states have internal predecessors, (28), 2 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) Word has length 40 [2022-11-20 20:08:46,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:08:46,393 INFO L225 Difference]: With dead ends: 801 [2022-11-20 20:08:46,393 INFO L226 Difference]: Without dead ends: 506 [2022-11-20 20:08:46,394 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2022-11-20 20:08:46,395 INFO L413 NwaCegarLoop]: 115 mSDtfsCounter, 90 mSDsluCounter, 318 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 433 SdHoareTripleChecker+Invalid, 106 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:08:46,396 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [92 Valid, 433 Invalid, 106 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 20:08:46,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 506 states. [2022-11-20 20:08:46,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 506 to 491. [2022-11-20 20:08:46,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 491 states, 367 states have (on average 1.3814713896457766) internal successors, (507), 378 states have internal predecessors, (507), 81 states have call successors, (81), 43 states have call predecessors, (81), 42 states have return successors, (78), 70 states have call predecessors, (78), 78 states have call successors, (78) [2022-11-20 20:08:46,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 491 states to 491 states and 666 transitions. [2022-11-20 20:08:46,454 INFO L78 Accepts]: Start accepts. Automaton has 491 states and 666 transitions. Word has length 40 [2022-11-20 20:08:46,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:08:46,455 INFO L495 AbstractCegarLoop]: Abstraction has 491 states and 666 transitions. [2022-11-20 20:08:46,455 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.6) internal successors, (28), 4 states have internal predecessors, (28), 2 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2022-11-20 20:08:46,455 INFO L276 IsEmpty]: Start isEmpty. Operand 491 states and 666 transitions. [2022-11-20 20:08:46,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-11-20 20:08:46,457 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:08:46,457 INFO L195 NwaCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1] [2022-11-20 20:08:46,457 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-20 20:08:46,458 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:08:46,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:08:46,458 INFO L85 PathProgramCache]: Analyzing trace with hash -1512041001, now seen corresponding path program 1 times [2022-11-20 20:08:46,459 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:08:46,459 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1362704678] [2022-11-20 20:08:46,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:08:46,459 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:08:46,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:08:46,658 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:08:46,659 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:08:46,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1362704678] [2022-11-20 20:08:46,659 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1362704678] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:08:46,659 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:08:46,660 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-20 20:08:46,660 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1486450314] [2022-11-20 20:08:46,660 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:08:46,661 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-20 20:08:46,662 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:08:46,662 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-20 20:08:46,662 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-20 20:08:46,663 INFO L87 Difference]: Start difference. First operand 491 states and 666 transitions. Second operand has 6 states, 6 states have (on average 6.0) internal successors, (36), 5 states have internal predecessors, (36), 3 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2022-11-20 20:08:47,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:08:47,092 INFO L93 Difference]: Finished difference Result 1355 states and 1854 transitions. [2022-11-20 20:08:47,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-20 20:08:47,093 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 6.0) internal successors, (36), 5 states have internal predecessors, (36), 3 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 50 [2022-11-20 20:08:47,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:08:47,103 INFO L225 Difference]: With dead ends: 1355 [2022-11-20 20:08:47,103 INFO L226 Difference]: Without dead ends: 931 [2022-11-20 20:08:47,105 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2022-11-20 20:08:47,116 INFO L413 NwaCegarLoop]: 196 mSDtfsCounter, 197 mSDsluCounter, 570 mSDsCounter, 0 mSdLazyCounter, 250 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 199 SdHoareTripleChecker+Valid, 766 SdHoareTripleChecker+Invalid, 260 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 250 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 20:08:47,118 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [199 Valid, 766 Invalid, 260 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 250 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-20 20:08:47,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 931 states. [2022-11-20 20:08:47,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 931 to 905. [2022-11-20 20:08:47,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 905 states, 682 states have (on average 1.3768328445747802) internal successors, (939), 700 states have internal predecessors, (939), 144 states have call successors, (144), 79 states have call predecessors, (144), 78 states have return successors, (141), 126 states have call predecessors, (141), 141 states have call successors, (141) [2022-11-20 20:08:47,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 905 states to 905 states and 1224 transitions. [2022-11-20 20:08:47,230 INFO L78 Accepts]: Start accepts. Automaton has 905 states and 1224 transitions. Word has length 50 [2022-11-20 20:08:47,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:08:47,231 INFO L495 AbstractCegarLoop]: Abstraction has 905 states and 1224 transitions. [2022-11-20 20:08:47,231 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 6.0) internal successors, (36), 5 states have internal predecessors, (36), 3 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2022-11-20 20:08:47,232 INFO L276 IsEmpty]: Start isEmpty. Operand 905 states and 1224 transitions. [2022-11-20 20:08:47,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-11-20 20:08:47,233 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:08:47,234 INFO L195 NwaCegarLoop]: 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] [2022-11-20 20:08:47,234 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-11-20 20:08:47,234 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:08:47,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:08:47,240 INFO L85 PathProgramCache]: Analyzing trace with hash -1031429756, now seen corresponding path program 1 times [2022-11-20 20:08:47,241 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:08:47,241 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1946387526] [2022-11-20 20:08:47,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:08:47,241 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:08:47,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:08:47,452 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:08:47,453 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:08:47,453 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1946387526] [2022-11-20 20:08:47,453 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1946387526] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:08:47,453 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:08:47,453 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-20 20:08:47,453 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1198652774] [2022-11-20 20:08:47,454 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:08:47,454 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-20 20:08:47,454 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:08:47,454 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-20 20:08:47,455 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-20 20:08:47,455 INFO L87 Difference]: Start difference. First operand 905 states and 1224 transitions. Second operand has 6 states, 6 states have (on average 6.833333333333333) internal successors, (41), 6 states have internal predecessors, (41), 3 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-20 20:08:47,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:08:47,905 INFO L93 Difference]: Finished difference Result 2804 states and 3798 transitions. [2022-11-20 20:08:47,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-20 20:08:47,907 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 6.833333333333333) internal successors, (41), 6 states have internal predecessors, (41), 3 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 54 [2022-11-20 20:08:47,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:08:47,926 INFO L225 Difference]: With dead ends: 2804 [2022-11-20 20:08:47,926 INFO L226 Difference]: Without dead ends: 1905 [2022-11-20 20:08:47,930 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2022-11-20 20:08:47,931 INFO L413 NwaCegarLoop]: 106 mSDtfsCounter, 345 mSDsluCounter, 151 mSDsCounter, 0 mSdLazyCounter, 170 mSolverCounterSat, 82 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 356 SdHoareTripleChecker+Valid, 257 SdHoareTripleChecker+Invalid, 252 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 82 IncrementalHoareTripleChecker+Valid, 170 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 20:08:47,931 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [356 Valid, 257 Invalid, 252 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [82 Valid, 170 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-20 20:08:47,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1905 states. [2022-11-20 20:08:48,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1905 to 1677. [2022-11-20 20:08:48,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1677 states, 1271 states have (on average 1.3634933123524784) internal successors, (1733), 1292 states have internal predecessors, (1733), 255 states have call successors, (255), 151 states have call predecessors, (255), 150 states have return successors, (252), 234 states have call predecessors, (252), 252 states have call successors, (252) [2022-11-20 20:08:48,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1677 states to 1677 states and 2240 transitions. [2022-11-20 20:08:48,133 INFO L78 Accepts]: Start accepts. Automaton has 1677 states and 2240 transitions. Word has length 54 [2022-11-20 20:08:48,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:08:48,134 INFO L495 AbstractCegarLoop]: Abstraction has 1677 states and 2240 transitions. [2022-11-20 20:08:48,134 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 6.833333333333333) internal successors, (41), 6 states have internal predecessors, (41), 3 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-20 20:08:48,134 INFO L276 IsEmpty]: Start isEmpty. Operand 1677 states and 2240 transitions. [2022-11-20 20:08:48,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-11-20 20:08:48,136 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:08:48,136 INFO L195 NwaCegarLoop]: 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] [2022-11-20 20:08:48,136 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-11-20 20:08:48,137 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:08:48,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:08:48,137 INFO L85 PathProgramCache]: Analyzing trace with hash -1333824375, now seen corresponding path program 1 times [2022-11-20 20:08:48,137 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:08:48,137 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [583236085] [2022-11-20 20:08:48,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:08:48,138 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:08:48,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:08:48,245 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:08:48,246 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:08:48,246 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [583236085] [2022-11-20 20:08:48,247 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [583236085] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:08:48,247 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:08:48,247 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-20 20:08:48,247 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1363214046] [2022-11-20 20:08:48,247 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:08:48,249 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-20 20:08:48,249 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:08:48,249 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-20 20:08:48,250 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2022-11-20 20:08:48,250 INFO L87 Difference]: Start difference. First operand 1677 states and 2240 transitions. Second operand has 6 states, 6 states have (on average 7.0) internal successors, (42), 6 states have internal predecessors, (42), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2022-11-20 20:08:48,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:08:48,784 INFO L93 Difference]: Finished difference Result 3769 states and 5161 transitions. [2022-11-20 20:08:48,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-20 20:08:48,785 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 7.0) internal successors, (42), 6 states have internal predecessors, (42), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 55 [2022-11-20 20:08:48,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:08:48,798 INFO L225 Difference]: With dead ends: 3769 [2022-11-20 20:08:48,799 INFO L226 Difference]: Without dead ends: 2707 [2022-11-20 20:08:48,804 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2022-11-20 20:08:48,806 INFO L413 NwaCegarLoop]: 184 mSDtfsCounter, 345 mSDsluCounter, 582 mSDsCounter, 0 mSdLazyCounter, 312 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 356 SdHoareTripleChecker+Valid, 766 SdHoareTripleChecker+Invalid, 340 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 312 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 20:08:48,807 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [356 Valid, 766 Invalid, 340 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 312 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-20 20:08:48,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2707 states. [2022-11-20 20:08:49,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2707 to 2177. [2022-11-20 20:08:49,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2177 states, 1657 states have (on average 1.368135184067592) internal successors, (2267), 1679 states have internal predecessors, (2267), 326 states have call successors, (326), 194 states have call predecessors, (326), 193 states have return successors, (323), 304 states have call predecessors, (323), 323 states have call successors, (323) [2022-11-20 20:08:49,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2177 states to 2177 states and 2916 transitions. [2022-11-20 20:08:49,036 INFO L78 Accepts]: Start accepts. Automaton has 2177 states and 2916 transitions. Word has length 55 [2022-11-20 20:08:49,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:08:49,036 INFO L495 AbstractCegarLoop]: Abstraction has 2177 states and 2916 transitions. [2022-11-20 20:08:49,037 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 7.0) internal successors, (42), 6 states have internal predecessors, (42), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2022-11-20 20:08:49,037 INFO L276 IsEmpty]: Start isEmpty. Operand 2177 states and 2916 transitions. [2022-11-20 20:08:49,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2022-11-20 20:08:49,039 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:08:49,039 INFO L195 NwaCegarLoop]: trace histogram [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] [2022-11-20 20:08:49,040 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-11-20 20:08:49,040 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:08:49,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:08:49,040 INFO L85 PathProgramCache]: Analyzing trace with hash -1244810678, now seen corresponding path program 1 times [2022-11-20 20:08:49,041 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:08:49,041 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [704192349] [2022-11-20 20:08:49,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:08:49,041 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:08:49,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:08:49,222 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-20 20:08:49,222 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:08:49,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [704192349] [2022-11-20 20:08:49,223 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [704192349] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:08:49,224 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:08:49,224 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-20 20:08:49,225 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [319306884] [2022-11-20 20:08:49,225 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:08:49,225 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-20 20:08:49,225 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:08:49,226 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-20 20:08:49,226 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-20 20:08:49,226 INFO L87 Difference]: Start difference. First operand 2177 states and 2916 transitions. Second operand has 6 states, 6 states have (on average 6.5) internal successors, (39), 6 states have internal predecessors, (39), 3 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2022-11-20 20:08:49,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:08:49,934 INFO L93 Difference]: Finished difference Result 6714 states and 9032 transitions. [2022-11-20 20:08:49,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-20 20:08:49,935 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 6.5) internal successors, (39), 6 states have internal predecessors, (39), 3 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 57 [2022-11-20 20:08:49,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:08:49,956 INFO L225 Difference]: With dead ends: 6714 [2022-11-20 20:08:49,956 INFO L226 Difference]: Without dead ends: 4543 [2022-11-20 20:08:49,962 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2022-11-20 20:08:49,963 INFO L413 NwaCegarLoop]: 115 mSDtfsCounter, 339 mSDsluCounter, 231 mSDsCounter, 0 mSdLazyCounter, 235 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 350 SdHoareTripleChecker+Valid, 346 SdHoareTripleChecker+Invalid, 320 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 235 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 20:08:49,964 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [350 Valid, 346 Invalid, 320 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 235 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-20 20:08:49,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4543 states. [2022-11-20 20:08:50,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4543 to 4170. [2022-11-20 20:08:50,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4170 states, 3169 states have (on average 1.3502682234143264) internal successors, (4279), 3197 states have internal predecessors, (4279), 622 states have call successors, (622), 379 states have call predecessors, (622), 378 states have return successors, (619), 594 states have call predecessors, (619), 619 states have call successors, (619) [2022-11-20 20:08:50,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4170 states to 4170 states and 5520 transitions. [2022-11-20 20:08:50,423 INFO L78 Accepts]: Start accepts. Automaton has 4170 states and 5520 transitions. Word has length 57 [2022-11-20 20:08:50,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:08:50,424 INFO L495 AbstractCegarLoop]: Abstraction has 4170 states and 5520 transitions. [2022-11-20 20:08:50,425 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 6.5) internal successors, (39), 6 states have internal predecessors, (39), 3 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2022-11-20 20:08:50,425 INFO L276 IsEmpty]: Start isEmpty. Operand 4170 states and 5520 transitions. [2022-11-20 20:08:50,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-11-20 20:08:50,429 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:08:50,429 INFO L195 NwaCegarLoop]: trace histogram [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] [2022-11-20 20:08:50,429 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-11-20 20:08:50,430 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:08:50,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:08:50,430 INFO L85 PathProgramCache]: Analyzing trace with hash -1580588632, now seen corresponding path program 1 times [2022-11-20 20:08:50,430 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:08:50,430 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1736968337] [2022-11-20 20:08:50,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:08:50,431 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:08:50,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:08:50,495 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:08:50,495 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:08:50,495 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1736968337] [2022-11-20 20:08:50,495 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1736968337] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:08:50,496 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:08:50,498 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-20 20:08:50,498 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2019675210] [2022-11-20 20:08:50,498 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:08:50,499 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 20:08:50,499 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:08:50,500 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 20:08:50,500 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 20:08:50,500 INFO L87 Difference]: Start difference. First operand 4170 states and 5520 transitions. Second operand has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-20 20:08:51,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:08:51,175 INFO L93 Difference]: Finished difference Result 11026 states and 14612 transitions. [2022-11-20 20:08:51,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 20:08:51,176 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 59 [2022-11-20 20:08:51,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:08:51,208 INFO L225 Difference]: With dead ends: 11026 [2022-11-20 20:08:51,208 INFO L226 Difference]: Without dead ends: 6862 [2022-11-20 20:08:51,219 INFO L412 NwaCegarLoop]: 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 [2022-11-20 20:08:51,219 INFO L413 NwaCegarLoop]: 165 mSDtfsCounter, 63 mSDsluCounter, 105 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 270 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-20 20:08:51,220 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 270 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-20 20:08:51,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6862 states. [2022-11-20 20:08:51,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6862 to 5293. [2022-11-20 20:08:51,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5293 states, 4061 states have (on average 1.3545924649101206) internal successors, (5501), 4115 states have internal predecessors, (5501), 745 states have call successors, (745), 487 states have call predecessors, (745), 486 states have return successors, (742), 691 states have call predecessors, (742), 742 states have call successors, (742) [2022-11-20 20:08:51,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5293 states to 5293 states and 6988 transitions. [2022-11-20 20:08:51,763 INFO L78 Accepts]: Start accepts. Automaton has 5293 states and 6988 transitions. Word has length 59 [2022-11-20 20:08:51,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:08:51,764 INFO L495 AbstractCegarLoop]: Abstraction has 5293 states and 6988 transitions. [2022-11-20 20:08:51,764 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-20 20:08:51,764 INFO L276 IsEmpty]: Start isEmpty. Operand 5293 states and 6988 transitions. [2022-11-20 20:08:51,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2022-11-20 20:08:51,767 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:08:51,768 INFO L195 NwaCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:08:51,768 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-11-20 20:08:51,768 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:08:51,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:08:51,769 INFO L85 PathProgramCache]: Analyzing trace with hash -112529311, now seen corresponding path program 1 times [2022-11-20 20:08:51,769 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:08:51,769 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1904257971] [2022-11-20 20:08:51,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:08:51,769 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:08:51,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:08:51,840 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-20 20:08:51,841 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:08:51,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1904257971] [2022-11-20 20:08:51,841 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1904257971] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:08:51,841 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:08:51,841 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-20 20:08:51,841 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1405948499] [2022-11-20 20:08:51,842 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:08:51,842 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-20 20:08:51,842 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:08:51,842 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-20 20:08:51,843 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2022-11-20 20:08:51,843 INFO L87 Difference]: Start difference. First operand 5293 states and 6988 transitions. Second operand has 5 states, 5 states have (on average 9.2) internal successors, (46), 5 states have internal predecessors, (46), 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) [2022-11-20 20:08:52,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:08:52,789 INFO L93 Difference]: Finished difference Result 10425 states and 13868 transitions. [2022-11-20 20:08:52,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-20 20:08:52,790 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 9.2) internal successors, (46), 5 states have internal predecessors, (46), 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 63 [2022-11-20 20:08:52,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:08:52,823 INFO L225 Difference]: With dead ends: 10425 [2022-11-20 20:08:52,823 INFO L226 Difference]: Without dead ends: 6650 [2022-11-20 20:08:52,836 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2022-11-20 20:08:52,837 INFO L413 NwaCegarLoop]: 255 mSDtfsCounter, 300 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 160 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 300 SdHoareTripleChecker+Valid, 388 SdHoareTripleChecker+Invalid, 182 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 160 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 20:08:52,837 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [300 Valid, 388 Invalid, 182 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 160 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-20 20:08:52,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6650 states. [2022-11-20 20:08:53,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6650 to 6553. [2022-11-20 20:08:53,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6553 states, 5053 states have (on average 1.3554324163863052) internal successors, (6849), 5109 states have internal predecessors, (6849), 907 states have call successors, (907), 593 states have call predecessors, (907), 592 states have return successors, (904), 851 states have call predecessors, (904), 904 states have call successors, (904) [2022-11-20 20:08:53,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6553 states to 6553 states and 8660 transitions. [2022-11-20 20:08:53,539 INFO L78 Accepts]: Start accepts. Automaton has 6553 states and 8660 transitions. Word has length 63 [2022-11-20 20:08:53,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:08:53,539 INFO L495 AbstractCegarLoop]: Abstraction has 6553 states and 8660 transitions. [2022-11-20 20:08:53,540 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 9.2) internal successors, (46), 5 states have internal predecessors, (46), 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) [2022-11-20 20:08:53,540 INFO L276 IsEmpty]: Start isEmpty. Operand 6553 states and 8660 transitions. [2022-11-20 20:08:53,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-11-20 20:08:53,543 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:08:53,544 INFO L195 NwaCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:08:53,544 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-11-20 20:08:53,544 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:08:53,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:08:53,544 INFO L85 PathProgramCache]: Analyzing trace with hash 1982299313, now seen corresponding path program 1 times [2022-11-20 20:08:53,545 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:08:53,545 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1161482823] [2022-11-20 20:08:53,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:08:53,545 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:08:53,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:08:53,691 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-20 20:08:53,691 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:08:53,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1161482823] [2022-11-20 20:08:53,691 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1161482823] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:08:53,691 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:08:53,692 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-20 20:08:53,692 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1202606931] [2022-11-20 20:08:53,692 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:08:53,692 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-20 20:08:53,693 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:08:53,693 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-20 20:08:53,693 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-20 20:08:53,694 INFO L87 Difference]: Start difference. First operand 6553 states and 8660 transitions. Second operand has 6 states, 6 states have (on average 8.166666666666666) internal successors, (49), 6 states have internal predecessors, (49), 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) [2022-11-20 20:08:55,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:08:55,311 INFO L93 Difference]: Finished difference Result 17413 states and 23670 transitions. [2022-11-20 20:08:55,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-20 20:08:55,311 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 8.166666666666666) internal successors, (49), 6 states have internal predecessors, (49), 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 66 [2022-11-20 20:08:55,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:08:55,386 INFO L225 Difference]: With dead ends: 17413 [2022-11-20 20:08:55,387 INFO L226 Difference]: Without dead ends: 12378 [2022-11-20 20:08:55,405 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2022-11-20 20:08:55,406 INFO L413 NwaCegarLoop]: 417 mSDtfsCounter, 439 mSDsluCounter, 980 mSDsCounter, 0 mSdLazyCounter, 735 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 450 SdHoareTripleChecker+Valid, 1397 SdHoareTripleChecker+Invalid, 774 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 735 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-20 20:08:55,406 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [450 Valid, 1397 Invalid, 774 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 735 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-20 20:08:55,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12378 states. [2022-11-20 20:08:56,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12378 to 9013. [2022-11-20 20:08:56,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9013 states, 6973 states have (on average 1.3562311773985372) internal successors, (9457), 7021 states have internal predecessors, (9457), 1235 states have call successors, (1235), 805 states have call predecessors, (1235), 804 states have return successors, (1232), 1187 states have call predecessors, (1232), 1232 states have call successors, (1232) [2022-11-20 20:08:56,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9013 states to 9013 states and 11924 transitions. [2022-11-20 20:08:56,625 INFO L78 Accepts]: Start accepts. Automaton has 9013 states and 11924 transitions. Word has length 66 [2022-11-20 20:08:56,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:08:56,625 INFO L495 AbstractCegarLoop]: Abstraction has 9013 states and 11924 transitions. [2022-11-20 20:08:56,626 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 8.166666666666666) internal successors, (49), 6 states have internal predecessors, (49), 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) [2022-11-20 20:08:56,626 INFO L276 IsEmpty]: Start isEmpty. Operand 9013 states and 11924 transitions. [2022-11-20 20:08:56,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2022-11-20 20:08:56,632 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:08:56,632 INFO L195 NwaCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1] [2022-11-20 20:08:56,633 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2022-11-20 20:08:56,633 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:08:56,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:08:56,634 INFO L85 PathProgramCache]: Analyzing trace with hash -1721327867, now seen corresponding path program 1 times [2022-11-20 20:08:56,634 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:08:56,634 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [610253839] [2022-11-20 20:08:56,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:08:56,634 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:08:56,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:08:56,680 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:08:56,681 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:08:56,681 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [610253839] [2022-11-20 20:08:56,681 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [610253839] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:08:56,681 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:08:56,681 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-20 20:08:56,682 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1988442086] [2022-11-20 20:08:56,682 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:08:56,683 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 20:08:56,683 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:08:56,683 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 20:08:56,684 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 20:08:56,684 INFO L87 Difference]: Start difference. First operand 9013 states and 11924 transitions. Second operand has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-20 20:08:57,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:08:57,734 INFO L93 Difference]: Finished difference Result 20864 states and 27576 transitions. [2022-11-20 20:08:57,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 20:08:57,735 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 69 [2022-11-20 20:08:57,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:08:57,783 INFO L225 Difference]: With dead ends: 20864 [2022-11-20 20:08:57,783 INFO L226 Difference]: Without dead ends: 11857 [2022-11-20 20:08:57,802 INFO L412 NwaCegarLoop]: 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 [2022-11-20 20:08:57,803 INFO L413 NwaCegarLoop]: 151 mSDtfsCounter, 52 mSDsluCounter, 106 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 257 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-20 20:08:57,803 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [52 Valid, 257 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-20 20:08:57,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11857 states. [2022-11-20 20:08:58,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11857 to 11053. [2022-11-20 20:08:58,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11053 states, 8697 states have (on average 1.3601241807519835) internal successors, (11829), 8753 states have internal predecessors, (11829), 1393 states have call successors, (1393), 963 states have call predecessors, (1393), 962 states have return successors, (1390), 1337 states have call predecessors, (1390), 1390 states have call successors, (1390) [2022-11-20 20:08:58,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11053 states to 11053 states and 14612 transitions. [2022-11-20 20:08:58,698 INFO L78 Accepts]: Start accepts. Automaton has 11053 states and 14612 transitions. Word has length 69 [2022-11-20 20:08:58,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:08:58,698 INFO L495 AbstractCegarLoop]: Abstraction has 11053 states and 14612 transitions. [2022-11-20 20:08:58,698 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-20 20:08:58,699 INFO L276 IsEmpty]: Start isEmpty. Operand 11053 states and 14612 transitions. [2022-11-20 20:08:58,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-11-20 20:08:58,702 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:08:58,702 INFO L195 NwaCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:08:58,702 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2022-11-20 20:08:58,703 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:08:58,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:08:58,703 INFO L85 PathProgramCache]: Analyzing trace with hash -1550974787, now seen corresponding path program 1 times [2022-11-20 20:08:58,703 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:08:58,704 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [73100243] [2022-11-20 20:08:58,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:08:58,704 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:08:58,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:08:58,782 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:08:58,782 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:08:58,783 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [73100243] [2022-11-20 20:08:58,783 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [73100243] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:08:58,783 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:08:58,783 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-20 20:08:58,783 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1870638937] [2022-11-20 20:08:58,783 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:08:58,784 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-20 20:08:58,784 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:08:58,784 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-20 20:08:58,784 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-20 20:08:58,785 INFO L87 Difference]: Start difference. First operand 11053 states and 14612 transitions. Second operand has 6 states, 6 states have (on average 8.833333333333334) internal successors, (53), 5 states have internal predecessors, (53), 3 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-20 20:09:00,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:09:00,429 INFO L93 Difference]: Finished difference Result 23158 states and 30980 transitions. [2022-11-20 20:09:00,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-20 20:09:00,429 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 8.833333333333334) internal successors, (53), 5 states have internal predecessors, (53), 3 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 70 [2022-11-20 20:09:00,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:09:00,492 INFO L225 Difference]: With dead ends: 23158 [2022-11-20 20:09:00,493 INFO L226 Difference]: Without dead ends: 14615 [2022-11-20 20:09:00,516 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2022-11-20 20:09:00,517 INFO L413 NwaCegarLoop]: 161 mSDtfsCounter, 186 mSDsluCounter, 516 mSDsCounter, 0 mSdLazyCounter, 296 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 200 SdHoareTripleChecker+Valid, 677 SdHoareTripleChecker+Invalid, 313 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 296 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 20:09:00,518 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [200 Valid, 677 Invalid, 313 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 296 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-20 20:09:00,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14615 states. [2022-11-20 20:09:01,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14615 to 12481. [2022-11-20 20:09:01,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12481 states, 9789 states have (on average 1.3530493410971498) internal successors, (13245), 9881 states have internal predecessors, (13245), 1589 states have call successors, (1589), 1103 states have call predecessors, (1589), 1102 states have return successors, (1586), 1497 states have call predecessors, (1586), 1586 states have call successors, (1586) [2022-11-20 20:09:01,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12481 states to 12481 states and 16420 transitions. [2022-11-20 20:09:01,851 INFO L78 Accepts]: Start accepts. Automaton has 12481 states and 16420 transitions. Word has length 70 [2022-11-20 20:09:01,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:09:01,851 INFO L495 AbstractCegarLoop]: Abstraction has 12481 states and 16420 transitions. [2022-11-20 20:09:01,852 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 8.833333333333334) internal successors, (53), 5 states have internal predecessors, (53), 3 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-20 20:09:01,852 INFO L276 IsEmpty]: Start isEmpty. Operand 12481 states and 16420 transitions. [2022-11-20 20:09:01,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-11-20 20:09:01,855 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:09:01,855 INFO L195 NwaCegarLoop]: trace histogram [3, 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, 1, 1] [2022-11-20 20:09:01,856 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2022-11-20 20:09:01,856 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:09:01,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:09:01,856 INFO L85 PathProgramCache]: Analyzing trace with hash -1837219835, now seen corresponding path program 1 times [2022-11-20 20:09:01,857 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:09:01,857 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [936682916] [2022-11-20 20:09:01,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:09:01,857 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:09:01,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:09:01,919 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 13 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-20 20:09:01,919 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:09:01,919 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [936682916] [2022-11-20 20:09:01,920 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [936682916] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 20:09:01,920 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [531170570] [2022-11-20 20:09:01,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:09:01,920 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:09:01,920 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55086e4b-0151-4ce4-8f08-839021d90a66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:09:01,937 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55086e4b-0151-4ce4-8f08-839021d90a66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:09:01,943 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55086e4b-0151-4ce4-8f08-839021d90a66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-20 20:09:02,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:09:02,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-20 20:09:02,060 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:09:02,131 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 16 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-20 20:09:02,131 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:09:02,132 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [531170570] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:09:02,132 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-20 20:09:02,132 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2022-11-20 20:09:02,132 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1040117157] [2022-11-20 20:09:02,132 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:09:02,133 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 20:09:02,133 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:09:02,133 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 20:09:02,134 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-20 20:09:02,134 INFO L87 Difference]: Start difference. First operand 12481 states and 16420 transitions. Second operand has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-11-20 20:09:04,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:09:04,007 INFO L93 Difference]: Finished difference Result 29180 states and 38393 transitions. [2022-11-20 20:09:04,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 20:09:04,008 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 71 [2022-11-20 20:09:04,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:09:04,069 INFO L225 Difference]: With dead ends: 29180 [2022-11-20 20:09:04,070 INFO L226 Difference]: Without dead ends: 16705 [2022-11-20 20:09:04,099 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-20 20:09:04,100 INFO L413 NwaCegarLoop]: 163 mSDtfsCounter, 63 mSDsluCounter, 105 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 268 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:09:04,101 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 268 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 20:09:04,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16705 states. [2022-11-20 20:09:05,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16705 to 15412. [2022-11-20 20:09:05,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15412 states, 12272 states have (on average 1.3516949152542372) internal successors, (16588), 12372 states have internal predecessors, (16588), 1813 states have call successors, (1813), 1327 states have call predecessors, (1813), 1326 states have return successors, (1810), 1713 states have call predecessors, (1810), 1810 states have call successors, (1810) [2022-11-20 20:09:05,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15412 states to 15412 states and 20211 transitions. [2022-11-20 20:09:05,465 INFO L78 Accepts]: Start accepts. Automaton has 15412 states and 20211 transitions. Word has length 71 [2022-11-20 20:09:05,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:09:05,466 INFO L495 AbstractCegarLoop]: Abstraction has 15412 states and 20211 transitions. [2022-11-20 20:09:05,466 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-11-20 20:09:05,466 INFO L276 IsEmpty]: Start isEmpty. Operand 15412 states and 20211 transitions. [2022-11-20 20:09:05,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2022-11-20 20:09:05,470 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:09:05,471 INFO L195 NwaCegarLoop]: trace histogram [3, 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] [2022-11-20 20:09:05,477 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55086e4b-0151-4ce4-8f08-839021d90a66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-11-20 20:09:05,677 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55086e4b-0151-4ce4-8f08-839021d90a66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-20 20:09:05,677 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:09:05,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:09:05,678 INFO L85 PathProgramCache]: Analyzing trace with hash -1572444277, now seen corresponding path program 1 times [2022-11-20 20:09:05,678 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:09:05,678 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [866792333] [2022-11-20 20:09:05,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:09:05,678 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:09:05,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:09:05,733 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-11-20 20:09:05,734 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:09:05,734 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [866792333] [2022-11-20 20:09:05,734 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [866792333] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:09:05,734 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:09:05,734 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-20 20:09:05,735 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1837250661] [2022-11-20 20:09:05,735 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:09:05,736 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 20:09:05,736 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:09:05,736 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 20:09:05,736 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 20:09:05,737 INFO L87 Difference]: Start difference. First operand 15412 states and 20211 transitions. Second operand has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 2 states have call predecessors, (9), 2 states have call successors, (9) [2022-11-20 20:09:07,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:09:07,325 INFO L93 Difference]: Finished difference Result 37059 states and 48669 transitions. [2022-11-20 20:09:07,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 20:09:07,325 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 2 states have call predecessors, (9), 2 states have call successors, (9) Word has length 84 [2022-11-20 20:09:07,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:09:07,397 INFO L225 Difference]: With dead ends: 37059 [2022-11-20 20:09:07,398 INFO L226 Difference]: Without dead ends: 22559 [2022-11-20 20:09:07,430 INFO L412 NwaCegarLoop]: 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 [2022-11-20 20:09:07,431 INFO L413 NwaCegarLoop]: 125 mSDtfsCounter, 101 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 101 SdHoareTripleChecker+Valid, 217 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-20 20:09:07,431 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [101 Valid, 217 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-20 20:09:07,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22559 states. [2022-11-20 20:09:09,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22559 to 22536. [2022-11-20 20:09:09,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22536 states, 17966 states have (on average 1.3504953801625292) internal successors, (24263), 18118 states have internal predecessors, (24263), 2621 states have call successors, (2621), 1949 states have call predecessors, (2621), 1948 states have return successors, (2618), 2469 states have call predecessors, (2618), 2618 states have call successors, (2618) [2022-11-20 20:09:09,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22536 states to 22536 states and 29502 transitions. [2022-11-20 20:09:09,847 INFO L78 Accepts]: Start accepts. Automaton has 22536 states and 29502 transitions. Word has length 84 [2022-11-20 20:09:09,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:09:09,847 INFO L495 AbstractCegarLoop]: Abstraction has 22536 states and 29502 transitions. [2022-11-20 20:09:09,847 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 2 states have call predecessors, (9), 2 states have call successors, (9) [2022-11-20 20:09:09,848 INFO L276 IsEmpty]: Start isEmpty. Operand 22536 states and 29502 transitions. [2022-11-20 20:09:09,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2022-11-20 20:09:09,857 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:09:09,858 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 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, 1, 1, 1] [2022-11-20 20:09:09,858 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2022-11-20 20:09:09,858 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:09:09,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:09:09,859 INFO L85 PathProgramCache]: Analyzing trace with hash 1696729866, now seen corresponding path program 1 times [2022-11-20 20:09:09,859 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:09:09,859 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1070497928] [2022-11-20 20:09:09,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:09:09,860 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:09:09,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:09:10,354 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 16 proven. 18 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-20 20:09:10,355 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:09:10,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1070497928] [2022-11-20 20:09:10,355 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1070497928] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 20:09:10,356 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1486073319] [2022-11-20 20:09:10,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:09:10,356 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:09:10,356 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55086e4b-0151-4ce4-8f08-839021d90a66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:09:10,359 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55086e4b-0151-4ce4-8f08-839021d90a66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:09:10,382 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55086e4b-0151-4ce4-8f08-839021d90a66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-20 20:09:10,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:09:10,488 INFO L263 TraceCheckSpWp]: Trace formula consists of 356 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-20 20:09:10,495 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:09:10,627 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 32 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-20 20:09:10,627 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:09:10,627 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1486073319] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:09:10,628 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-20 20:09:10,628 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [11] total 12 [2022-11-20 20:09:10,630 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1546849978] [2022-11-20 20:09:10,631 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:09:10,631 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 20:09:10,632 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:09:10,632 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 20:09:10,632 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2022-11-20 20:09:10,632 INFO L87 Difference]: Start difference. First operand 22536 states and 29502 transitions. Second operand has 3 states, 3 states have (on average 19.666666666666668) internal successors, (59), 2 states have internal predecessors, (59), 2 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2022-11-20 20:09:13,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:09:13,622 INFO L93 Difference]: Finished difference Result 61442 states and 80916 transitions. [2022-11-20 20:09:13,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 20:09:13,623 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.666666666666668) internal successors, (59), 2 states have internal predecessors, (59), 2 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) Word has length 100 [2022-11-20 20:09:13,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:09:13,774 INFO L225 Difference]: With dead ends: 61442 [2022-11-20 20:09:13,775 INFO L226 Difference]: Without dead ends: 41973 [2022-11-20 20:09:13,827 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 104 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2022-11-20 20:09:13,828 INFO L413 NwaCegarLoop]: 123 mSDtfsCounter, 70 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 218 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-20 20:09:13,828 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [70 Valid, 218 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-20 20:09:13,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41973 states. [2022-11-20 20:09:17,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41973 to 41968. [2022-11-20 20:09:17,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41968 states, 33510 states have (on average 1.3479558340793794) internal successors, (45170), 33806 states have internal predecessors, (45170), 4843 states have call successors, (4843), 3615 states have call predecessors, (4843), 3614 states have return successors, (4840), 4547 states have call predecessors, (4840), 4840 states have call successors, (4840) [2022-11-20 20:09:17,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41968 states to 41968 states and 54853 transitions. [2022-11-20 20:09:17,372 INFO L78 Accepts]: Start accepts. Automaton has 41968 states and 54853 transitions. Word has length 100 [2022-11-20 20:09:17,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:09:17,373 INFO L495 AbstractCegarLoop]: Abstraction has 41968 states and 54853 transitions. [2022-11-20 20:09:17,373 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.666666666666668) internal successors, (59), 2 states have internal predecessors, (59), 2 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2022-11-20 20:09:17,373 INFO L276 IsEmpty]: Start isEmpty. Operand 41968 states and 54853 transitions. [2022-11-20 20:09:17,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2022-11-20 20:09:17,383 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:09:17,383 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:09:17,389 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55086e4b-0151-4ce4-8f08-839021d90a66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-20 20:09:17,589 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55086e4b-0151-4ce4-8f08-839021d90a66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-20 20:09:17,589 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:09:17,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:09:17,590 INFO L85 PathProgramCache]: Analyzing trace with hash -315361883, now seen corresponding path program 1 times [2022-11-20 20:09:17,590 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:09:17,590 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [632764500] [2022-11-20 20:09:17,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:09:17,591 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:09:17,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:09:18,074 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 20 proven. 15 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-20 20:09:18,074 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:09:18,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [632764500] [2022-11-20 20:09:18,074 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [632764500] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 20:09:18,075 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1999487944] [2022-11-20 20:09:18,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:09:18,075 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:09:18,075 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55086e4b-0151-4ce4-8f08-839021d90a66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:09:18,076 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55086e4b-0151-4ce4-8f08-839021d90a66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:09:18,102 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55086e4b-0151-4ce4-8f08-839021d90a66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-20 20:09:18,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:09:18,194 INFO L263 TraceCheckSpWp]: Trace formula consists of 386 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-20 20:09:18,199 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:09:18,322 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 31 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-20 20:09:18,322 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:09:18,323 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1999487944] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:09:18,323 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-20 20:09:18,323 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [11] total 12 [2022-11-20 20:09:18,323 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2076996975] [2022-11-20 20:09:18,323 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:09:18,324 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 20:09:18,324 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:09:18,325 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 20:09:18,325 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2022-11-20 20:09:18,325 INFO L87 Difference]: Start difference. First operand 41968 states and 54853 transitions. Second operand has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 2 states have internal predecessors, (68), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 2 states have call predecessors, (9), 2 states have call successors, (9) [2022-11-20 20:09:23,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:09:23,229 INFO L93 Difference]: Finished difference Result 109650 states and 143525 transitions. [2022-11-20 20:09:23,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 20:09:23,230 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 2 states have internal predecessors, (68), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 2 states have call predecessors, (9), 2 states have call successors, (9) Word has length 99 [2022-11-20 20:09:23,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:09:23,631 INFO L225 Difference]: With dead ends: 109650 [2022-11-20 20:09:23,632 INFO L226 Difference]: Without dead ends: 83218 [2022-11-20 20:09:23,693 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2022-11-20 20:09:23,694 INFO L413 NwaCegarLoop]: 120 mSDtfsCounter, 60 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 218 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-20 20:09:23,694 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [60 Valid, 218 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-20 20:09:23,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83218 states.