./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.09.cil-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version e04fb08f 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_80da25ef-b662-43ab-b73e-79cb720e2f52/bin/utaipan-Xvt2sAort0/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80da25ef-b662-43ab-b73e-79cb720e2f52/bin/utaipan-Xvt2sAort0/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80da25ef-b662-43ab-b73e-79cb720e2f52/bin/utaipan-Xvt2sAort0/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80da25ef-b662-43ab-b73e-79cb720e2f52/bin/utaipan-Xvt2sAort0/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.09.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80da25ef-b662-43ab-b73e-79cb720e2f52/bin/utaipan-Xvt2sAort0/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80da25ef-b662-43ab-b73e-79cb720e2f52/bin/utaipan-Xvt2sAort0 --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 20da2548babe3ea7ba69c8856235b685b3dad9dcce2cbb8d7159e2037477f2fb --- 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-e04fb08 [2022-11-16 20:10:24,639 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-16 20:10:24,641 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-16 20:10:24,664 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-16 20:10:24,664 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-16 20:10:24,665 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-16 20:10:24,667 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-16 20:10:24,668 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-16 20:10:24,670 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-16 20:10:24,671 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-16 20:10:24,672 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-16 20:10:24,673 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-16 20:10:24,673 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-16 20:10:24,674 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-16 20:10:24,675 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-16 20:10:24,677 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-16 20:10:24,678 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-16 20:10:24,678 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-16 20:10:24,680 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-16 20:10:24,682 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-16 20:10:24,684 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-16 20:10:24,685 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-16 20:10:24,686 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-16 20:10:24,687 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-16 20:10:24,691 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-16 20:10:24,691 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-16 20:10:24,692 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-16 20:10:24,693 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-16 20:10:24,693 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-16 20:10:24,694 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-16 20:10:24,695 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-16 20:10:24,696 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-16 20:10:24,696 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-16 20:10:24,697 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-16 20:10:24,698 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-16 20:10:24,699 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-16 20:10:24,700 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-16 20:10:24,700 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-16 20:10:24,700 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-16 20:10:24,701 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-16 20:10:24,702 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-16 20:10:24,703 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80da25ef-b662-43ab-b73e-79cb720e2f52/bin/utaipan-Xvt2sAort0/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-16 20:10:24,745 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-16 20:10:24,745 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-16 20:10:24,746 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-16 20:10:24,746 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-16 20:10:24,747 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-16 20:10:24,747 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-16 20:10:24,747 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-16 20:10:24,747 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-16 20:10:24,748 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-16 20:10:24,748 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-16 20:10:24,748 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-16 20:10:24,748 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-16 20:10:24,748 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-16 20:10:24,749 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-16 20:10:24,749 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-16 20:10:24,749 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-16 20:10:24,749 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-16 20:10:24,750 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-16 20:10:24,750 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-16 20:10:24,751 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-16 20:10:24,751 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-16 20:10:24,751 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-16 20:10:24,752 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-16 20:10:24,752 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-16 20:10:24,752 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-16 20:10:24,752 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-16 20:10:24,752 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-16 20:10:24,753 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-16 20:10:24,753 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-16 20:10:24,753 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-16 20:10:24,754 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-16 20:10:24,754 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-16 20:10:24,754 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-16 20:10:24,754 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-16 20:10:24,755 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-16 20:10:24,755 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-16 20:10:24,755 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-16 20:10:24,755 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-16 20:10:24,755 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-16 20:10:24,756 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-16 20:10:24,756 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-16 20:10:24,756 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_80da25ef-b662-43ab-b73e-79cb720e2f52/bin/utaipan-Xvt2sAort0/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80da25ef-b662-43ab-b73e-79cb720e2f52/bin/utaipan-Xvt2sAort0 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 20da2548babe3ea7ba69c8856235b685b3dad9dcce2cbb8d7159e2037477f2fb [2022-11-16 20:10:24,985 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-16 20:10:25,019 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-16 20:10:25,022 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-16 20:10:25,023 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-16 20:10:25,024 INFO L275 PluginConnector]: CDTParser initialized [2022-11-16 20:10:25,026 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80da25ef-b662-43ab-b73e-79cb720e2f52/bin/utaipan-Xvt2sAort0/../../sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.09.cil-2.c [2022-11-16 20:10:25,102 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80da25ef-b662-43ab-b73e-79cb720e2f52/bin/utaipan-Xvt2sAort0/data/87dda7b81/8a08d2237b43431bbec75dd792abeddb/FLAG56e8a431a [2022-11-16 20:10:25,636 INFO L306 CDTParser]: Found 1 translation units. [2022-11-16 20:10:25,637 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80da25ef-b662-43ab-b73e-79cb720e2f52/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.09.cil-2.c [2022-11-16 20:10:25,650 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80da25ef-b662-43ab-b73e-79cb720e2f52/bin/utaipan-Xvt2sAort0/data/87dda7b81/8a08d2237b43431bbec75dd792abeddb/FLAG56e8a431a [2022-11-16 20:10:25,953 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80da25ef-b662-43ab-b73e-79cb720e2f52/bin/utaipan-Xvt2sAort0/data/87dda7b81/8a08d2237b43431bbec75dd792abeddb [2022-11-16 20:10:25,955 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-16 20:10:25,957 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-16 20:10:25,958 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-16 20:10:25,958 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-16 20:10:25,962 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-16 20:10:25,962 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.11 08:10:25" (1/1) ... [2022-11-16 20:10:25,963 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7aee1394 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:10:25, skipping insertion in model container [2022-11-16 20:10:25,964 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.11 08:10:25" (1/1) ... [2022-11-16 20:10:25,971 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-16 20:10:26,034 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-16 20:10:26,209 WARN L229 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_80da25ef-b662-43ab-b73e-79cb720e2f52/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.09.cil-2.c[911,924] [2022-11-16 20:10:26,266 WARN L229 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_80da25ef-b662-43ab-b73e-79cb720e2f52/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.09.cil-2.c[8416,8429] [2022-11-16 20:10:26,353 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-16 20:10:26,384 INFO L203 MainTranslator]: Completed pre-run [2022-11-16 20:10:26,395 WARN L229 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_80da25ef-b662-43ab-b73e-79cb720e2f52/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.09.cil-2.c[911,924] [2022-11-16 20:10:26,424 WARN L229 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_80da25ef-b662-43ab-b73e-79cb720e2f52/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.09.cil-2.c[8416,8429] [2022-11-16 20:10:26,514 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-16 20:10:26,553 INFO L208 MainTranslator]: Completed translation [2022-11-16 20:10:26,554 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:10:26 WrapperNode [2022-11-16 20:10:26,554 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-16 20:10:26,555 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-16 20:10:26,555 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-16 20:10:26,555 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-16 20:10:26,561 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:10:26" (1/1) ... [2022-11-16 20:10:26,574 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:10:26" (1/1) ... [2022-11-16 20:10:26,635 INFO L138 Inliner]: procedures = 73, calls = 89, calls flagged for inlining = 41, calls inlined = 41, statements flattened = 909 [2022-11-16 20:10:26,635 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-16 20:10:26,636 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-16 20:10:26,636 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-16 20:10:26,636 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-16 20:10:26,645 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:10:26" (1/1) ... [2022-11-16 20:10:26,646 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:10:26" (1/1) ... [2022-11-16 20:10:26,652 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:10:26" (1/1) ... [2022-11-16 20:10:26,652 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:10:26" (1/1) ... [2022-11-16 20:10:26,681 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:10:26" (1/1) ... [2022-11-16 20:10:26,694 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:10:26" (1/1) ... [2022-11-16 20:10:26,710 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:10:26" (1/1) ... [2022-11-16 20:10:26,713 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:10:26" (1/1) ... [2022-11-16 20:10:26,719 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-16 20:10:26,720 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-16 20:10:26,720 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-16 20:10:26,720 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-16 20:10:26,721 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:10:26" (1/1) ... [2022-11-16 20:10:26,736 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-16 20:10:26,746 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80da25ef-b662-43ab-b73e-79cb720e2f52/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:10:26,760 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80da25ef-b662-43ab-b73e-79cb720e2f52/bin/utaipan-Xvt2sAort0/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-16 20:10:26,783 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80da25ef-b662-43ab-b73e-79cb720e2f52/bin/utaipan-Xvt2sAort0/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-16 20:10:26,810 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-16 20:10:26,811 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2022-11-16 20:10:26,811 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2022-11-16 20:10:26,811 INFO L130 BoogieDeclarations]: Found specification of procedure is_do_write_p_triggered [2022-11-16 20:10:26,811 INFO L138 BoogieDeclarations]: Found implementation of procedure is_do_write_p_triggered [2022-11-16 20:10:26,811 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread1 [2022-11-16 20:10:26,812 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread1 [2022-11-16 20:10:26,812 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread2 [2022-11-16 20:10:26,812 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread2 [2022-11-16 20:10:26,812 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events1 [2022-11-16 20:10:26,812 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events1 [2022-11-16 20:10:26,813 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events2 [2022-11-16 20:10:26,813 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events2 [2022-11-16 20:10:26,813 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads2 [2022-11-16 20:10:26,813 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads2 [2022-11-16 20:10:26,813 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads1 [2022-11-16 20:10:26,813 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads1 [2022-11-16 20:10:26,814 INFO L130 BoogieDeclarations]: Found specification of procedure is_do_read_c_triggered [2022-11-16 20:10:26,814 INFO L138 BoogieDeclarations]: Found implementation of procedure is_do_read_c_triggered [2022-11-16 20:10:26,814 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels1 [2022-11-16 20:10:26,814 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels1 [2022-11-16 20:10:26,814 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels2 [2022-11-16 20:10:26,814 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels2 [2022-11-16 20:10:26,815 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-16 20:10:26,815 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events2 [2022-11-16 20:10:26,815 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events2 [2022-11-16 20:10:26,816 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events1 [2022-11-16 20:10:26,817 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events1 [2022-11-16 20:10:26,817 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-16 20:10:26,817 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-16 20:10:26,818 INFO L130 BoogieDeclarations]: Found specification of procedure error1 [2022-11-16 20:10:26,818 INFO L138 BoogieDeclarations]: Found implementation of procedure error1 [2022-11-16 20:10:26,818 INFO L130 BoogieDeclarations]: Found specification of procedure error2 [2022-11-16 20:10:26,818 INFO L138 BoogieDeclarations]: Found implementation of procedure error2 [2022-11-16 20:10:27,004 INFO L235 CfgBuilder]: Building ICFG [2022-11-16 20:10:27,006 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-16 20:10:27,959 INFO L769 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##56: assume !(1 == ~q_free~0); [2022-11-16 20:10:27,960 INFO L769 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##55: assume 1 == ~q_free~0;~c_dr_st~0 := 2;~c_dr_pc~0 := 2;~a_t~0 := do_read_c_~a~0#1; [2022-11-16 20:10:28,072 INFO L276 CfgBuilder]: Performing block encoding [2022-11-16 20:10:28,549 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-16 20:10:28,549 INFO L300 CfgBuilder]: Removed 16 assume(true) statements. [2022-11-16 20:10:28,554 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.11 08:10:28 BoogieIcfgContainer [2022-11-16 20:10:28,554 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-16 20:10:28,558 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-16 20:10:28,559 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-16 20:10:28,562 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-16 20:10:28,563 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 16.11 08:10:25" (1/3) ... [2022-11-16 20:10:28,565 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@33e79785 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.11 08:10:28, skipping insertion in model container [2022-11-16 20:10:28,565 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:10:26" (2/3) ... [2022-11-16 20:10:28,565 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@33e79785 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.11 08:10:28, skipping insertion in model container [2022-11-16 20:10:28,565 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.11 08:10:28" (3/3) ... [2022-11-16 20:10:28,567 INFO L112 eAbstractionObserver]: Analyzing ICFG pc_sfifo_3.cil+token_ring.09.cil-2.c [2022-11-16 20:10:28,586 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-16 20:10:28,586 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2022-11-16 20:10:28,675 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-16 20:10:28,686 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;@75fb45bf, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-16 20:10:28,686 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2022-11-16 20:10:28,692 INFO L276 IsEmpty]: Start isEmpty. Operand has 240 states, 181 states have (on average 1.5414364640883977) internal successors, (279), 189 states have internal predecessors, (279), 41 states have call successors, (41), 15 states have call predecessors, (41), 15 states have return successors, (41), 39 states have call predecessors, (41), 41 states have call successors, (41) [2022-11-16 20:10:28,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-11-16 20:10:28,706 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:10:28,707 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] [2022-11-16 20:10:28,707 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 20:10:28,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:10:28,715 INFO L85 PathProgramCache]: Analyzing trace with hash -2144909491, now seen corresponding path program 1 times [2022-11-16 20:10:28,724 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:10:28,725 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1042472869] [2022-11-16 20:10:28,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:10:28,726 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:10:28,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:10:29,133 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:10:29,134 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:10:29,134 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1042472869] [2022-11-16 20:10:29,135 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1042472869] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 20:10:29,135 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 20:10:29,136 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-16 20:10:29,138 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1644638460] [2022-11-16 20:10:29,139 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 20:10:29,143 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-16 20:10:29,143 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:10:29,166 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-16 20:10:29,167 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-16 20:10:29,169 INFO L87 Difference]: Start difference. First operand has 240 states, 181 states have (on average 1.5414364640883977) internal successors, (279), 189 states have internal predecessors, (279), 41 states have call successors, (41), 15 states have call predecessors, (41), 15 states have return successors, (41), 39 states have call predecessors, (41), 41 states have call successors, (41) Second operand has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) [2022-11-16 20:10:29,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:10:29,785 INFO L93 Difference]: Finished difference Result 602 states and 900 transitions. [2022-11-16 20:10:29,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-16 20:10:29,789 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) Word has length 44 [2022-11-16 20:10:29,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:10:29,801 INFO L225 Difference]: With dead ends: 602 [2022-11-16 20:10:29,801 INFO L226 Difference]: Without dead ends: 363 [2022-11-16 20:10:29,806 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 [2022-11-16 20:10:29,809 INFO L413 NwaCegarLoop]: 358 mSDtfsCounter, 411 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 288 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 411 SdHoareTripleChecker+Valid, 634 SdHoareTripleChecker+Invalid, 310 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 288 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-16 20:10:29,810 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [411 Valid, 634 Invalid, 310 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 288 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-16 20:10:29,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 363 states. [2022-11-16 20:10:29,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 363 to 352. [2022-11-16 20:10:29,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 352 states, 262 states have (on average 1.4465648854961832) internal successors, (379), 267 states have internal predecessors, (379), 61 states have call successors, (61), 29 states have call predecessors, (61), 27 states have return successors, (60), 57 states have call predecessors, (60), 57 states have call successors, (60) [2022-11-16 20:10:29,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 352 states to 352 states and 500 transitions. [2022-11-16 20:10:29,884 INFO L78 Accepts]: Start accepts. Automaton has 352 states and 500 transitions. Word has length 44 [2022-11-16 20:10:29,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:10:29,885 INFO L495 AbstractCegarLoop]: Abstraction has 352 states and 500 transitions. [2022-11-16 20:10:29,885 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) [2022-11-16 20:10:29,886 INFO L276 IsEmpty]: Start isEmpty. Operand 352 states and 500 transitions. [2022-11-16 20:10:29,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-11-16 20:10:29,888 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:10:29,888 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] [2022-11-16 20:10:29,888 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-16 20:10:29,889 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 20:10:29,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:10:29,889 INFO L85 PathProgramCache]: Analyzing trace with hash -1099465994, now seen corresponding path program 1 times [2022-11-16 20:10:29,890 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:10:29,890 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [270159766] [2022-11-16 20:10:29,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:10:29,890 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:10:29,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:10:30,081 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:10:30,082 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:10:30,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [270159766] [2022-11-16 20:10:30,082 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [270159766] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 20:10:30,083 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 20:10:30,083 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-16 20:10:30,083 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [849334514] [2022-11-16 20:10:30,083 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 20:10:30,085 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-16 20:10:30,085 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:10:30,085 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-16 20:10:30,086 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-16 20:10:30,087 INFO L87 Difference]: Start difference. First operand 352 states and 500 transitions. Second operand has 6 states, 6 states have (on average 5.0) internal successors, (30), 6 states have internal predecessors, (30), 4 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2022-11-16 20:10:31,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:10:31,026 INFO L93 Difference]: Finished difference Result 889 states and 1223 transitions. [2022-11-16 20:10:31,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-16 20:10:31,026 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 5.0) internal successors, (30), 6 states have internal predecessors, (30), 4 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) Word has length 45 [2022-11-16 20:10:31,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:10:31,030 INFO L225 Difference]: With dead ends: 889 [2022-11-16 20:10:31,030 INFO L226 Difference]: Without dead ends: 423 [2022-11-16 20:10:31,032 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2022-11-16 20:10:31,033 INFO L413 NwaCegarLoop]: 430 mSDtfsCounter, 890 mSDsluCounter, 666 mSDsCounter, 0 mSdLazyCounter, 778 mSolverCounterSat, 288 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 898 SdHoareTripleChecker+Valid, 1096 SdHoareTripleChecker+Invalid, 1066 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 288 IncrementalHoareTripleChecker+Valid, 778 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-16 20:10:31,033 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [898 Valid, 1096 Invalid, 1066 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [288 Valid, 778 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-16 20:10:31,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 423 states. [2022-11-16 20:10:31,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 423 to 338. [2022-11-16 20:10:31,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 338 states, 248 states have (on average 1.3951612903225807) internal successors, (346), 253 states have internal predecessors, (346), 61 states have call successors, (61), 29 states have call predecessors, (61), 27 states have return successors, (57), 57 states have call predecessors, (57), 57 states have call successors, (57) [2022-11-16 20:10:31,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 338 states to 338 states and 464 transitions. [2022-11-16 20:10:31,084 INFO L78 Accepts]: Start accepts. Automaton has 338 states and 464 transitions. Word has length 45 [2022-11-16 20:10:31,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:10:31,085 INFO L495 AbstractCegarLoop]: Abstraction has 338 states and 464 transitions. [2022-11-16 20:10:31,085 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 5.0) internal successors, (30), 6 states have internal predecessors, (30), 4 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2022-11-16 20:10:31,086 INFO L276 IsEmpty]: Start isEmpty. Operand 338 states and 464 transitions. [2022-11-16 20:10:31,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-11-16 20:10:31,093 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:10:31,093 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] [2022-11-16 20:10:31,094 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-16 20:10:31,094 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 20:10:31,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:10:31,099 INFO L85 PathProgramCache]: Analyzing trace with hash 1387964004, now seen corresponding path program 1 times [2022-11-16 20:10:31,099 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:10:31,099 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1448075945] [2022-11-16 20:10:31,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:10:31,100 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:10:31,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:10:31,238 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:10:31,239 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:10:31,239 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1448075945] [2022-11-16 20:10:31,239 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1448075945] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 20:10:31,239 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 20:10:31,240 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-16 20:10:31,240 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [885515566] [2022-11-16 20:10:31,240 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 20:10:31,240 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-16 20:10:31,241 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:10:31,241 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-16 20:10:31,242 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-16 20:10:31,242 INFO L87 Difference]: Start difference. First operand 338 states and 464 transitions. Second operand has 6 states, 6 states have (on average 5.166666666666667) internal successors, (31), 6 states have internal predecessors, (31), 4 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2022-11-16 20:10:32,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:10:32,039 INFO L93 Difference]: Finished difference Result 804 states and 1072 transitions. [2022-11-16 20:10:32,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-16 20:10:32,040 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 5.166666666666667) internal successors, (31), 6 states have internal predecessors, (31), 4 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) Word has length 46 [2022-11-16 20:10:32,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:10:32,047 INFO L225 Difference]: With dead ends: 804 [2022-11-16 20:10:32,047 INFO L226 Difference]: Without dead ends: 627 [2022-11-16 20:10:32,052 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2022-11-16 20:10:32,056 INFO L413 NwaCegarLoop]: 418 mSDtfsCounter, 798 mSDsluCounter, 629 mSDsCounter, 0 mSdLazyCounter, 668 mSolverCounterSat, 287 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 807 SdHoareTripleChecker+Valid, 1047 SdHoareTripleChecker+Invalid, 955 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 287 IncrementalHoareTripleChecker+Valid, 668 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-16 20:10:32,057 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [807 Valid, 1047 Invalid, 955 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [287 Valid, 668 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-16 20:10:32,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 627 states. [2022-11-16 20:10:32,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 627 to 602. [2022-11-16 20:10:32,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 602 states, 429 states have (on average 1.317016317016317) internal successors, (565), 434 states have internal predecessors, (565), 110 states have call successors, (110), 63 states have call predecessors, (110), 61 states have return successors, (123), 106 states have call predecessors, (123), 106 states have call successors, (123) [2022-11-16 20:10:32,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 602 states to 602 states and 798 transitions. [2022-11-16 20:10:32,119 INFO L78 Accepts]: Start accepts. Automaton has 602 states and 798 transitions. Word has length 46 [2022-11-16 20:10:32,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:10:32,120 INFO L495 AbstractCegarLoop]: Abstraction has 602 states and 798 transitions. [2022-11-16 20:10:32,120 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 5.166666666666667) internal successors, (31), 6 states have internal predecessors, (31), 4 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2022-11-16 20:10:32,120 INFO L276 IsEmpty]: Start isEmpty. Operand 602 states and 798 transitions. [2022-11-16 20:10:32,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-11-16 20:10:32,122 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:10:32,122 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] [2022-11-16 20:10:32,122 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-16 20:10:32,122 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 20:10:32,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:10:32,123 INFO L85 PathProgramCache]: Analyzing trace with hash -277811671, now seen corresponding path program 1 times [2022-11-16 20:10:32,123 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:10:32,123 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1669158920] [2022-11-16 20:10:32,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:10:32,124 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:10:32,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:10:32,177 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:10:32,177 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:10:32,178 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1669158920] [2022-11-16 20:10:32,178 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1669158920] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 20:10:32,178 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 20:10:32,178 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-16 20:10:32,179 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1374298495] [2022-11-16 20:10:32,179 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 20:10:32,179 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-16 20:10:32,179 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:10:32,180 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-16 20:10:32,180 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-16 20:10:32,180 INFO L87 Difference]: Start difference. First operand 602 states and 798 transitions. Second operand has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 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) [2022-11-16 20:10:32,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:10:32,329 INFO L93 Difference]: Finished difference Result 603 states and 799 transitions. [2022-11-16 20:10:32,330 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-16 20:10:32,330 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 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 50 [2022-11-16 20:10:32,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:10:32,332 INFO L225 Difference]: With dead ends: 603 [2022-11-16 20:10:32,332 INFO L226 Difference]: Without dead ends: 159 [2022-11-16 20:10:32,334 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 [2022-11-16 20:10:32,335 INFO L413 NwaCegarLoop]: 270 mSDtfsCounter, 308 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 308 SdHoareTripleChecker+Valid, 270 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 20:10:32,335 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [308 Valid, 270 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 20:10:32,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2022-11-16 20:10:32,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 159. [2022-11-16 20:10:32,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 127 states have (on average 1.5196850393700787) internal successors, (193), 129 states have internal predecessors, (193), 25 states have call successors, (25), 7 states have call predecessors, (25), 6 states have return successors, (23), 23 states have call predecessors, (23), 23 states have call successors, (23) [2022-11-16 20:10:32,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 241 transitions. [2022-11-16 20:10:32,357 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 241 transitions. Word has length 50 [2022-11-16 20:10:32,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:10:32,357 INFO L495 AbstractCegarLoop]: Abstraction has 159 states and 241 transitions. [2022-11-16 20:10:32,358 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 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) [2022-11-16 20:10:32,358 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 241 transitions. [2022-11-16 20:10:32,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-11-16 20:10:32,359 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:10:32,359 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, 1, 1, 1, 1] [2022-11-16 20:10:32,360 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-11-16 20:10:32,360 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 20:10:32,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:10:32,361 INFO L85 PathProgramCache]: Analyzing trace with hash -1478670711, now seen corresponding path program 1 times [2022-11-16 20:10:32,361 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:10:32,361 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1710874805] [2022-11-16 20:10:32,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:10:32,362 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:10:32,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:10:32,567 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:10:32,567 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:10:32,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1710874805] [2022-11-16 20:10:32,567 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1710874805] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 20:10:32,569 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 20:10:32,569 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-16 20:10:32,569 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2046910000] [2022-11-16 20:10:32,569 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 20:10:32,570 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-16 20:10:32,570 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:10:32,570 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-16 20:10:32,571 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-16 20:10:32,571 INFO L87 Difference]: Start difference. First operand 159 states and 241 transitions. Second operand has 5 states, 5 states have (on average 9.6) internal successors, (48), 5 states have internal predecessors, (48), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-11-16 20:10:33,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:10:33,373 INFO L93 Difference]: Finished difference Result 882 states and 1425 transitions. [2022-11-16 20:10:33,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-16 20:10:33,373 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 9.6) internal successors, (48), 5 states have internal predecessors, (48), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 59 [2022-11-16 20:10:33,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:10:33,381 INFO L225 Difference]: With dead ends: 882 [2022-11-16 20:10:33,381 INFO L226 Difference]: Without dead ends: 729 [2022-11-16 20:10:33,383 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-11-16 20:10:33,388 INFO L413 NwaCegarLoop]: 445 mSDtfsCounter, 1055 mSDsluCounter, 651 mSDsCounter, 0 mSdLazyCounter, 519 mSolverCounterSat, 213 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1069 SdHoareTripleChecker+Valid, 1096 SdHoareTripleChecker+Invalid, 732 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 213 IncrementalHoareTripleChecker+Valid, 519 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-16 20:10:33,388 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1069 Valid, 1096 Invalid, 732 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [213 Valid, 519 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-16 20:10:33,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 729 states. [2022-11-16 20:10:33,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 729 to 716. [2022-11-16 20:10:33,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 716 states, 587 states have (on average 1.514480408858603) internal successors, (889), 592 states have internal predecessors, (889), 98 states have call successors, (98), 31 states have call predecessors, (98), 30 states have return successors, (146), 93 states have call predecessors, (146), 96 states have call successors, (146) [2022-11-16 20:10:33,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 716 states to 716 states and 1133 transitions. [2022-11-16 20:10:33,467 INFO L78 Accepts]: Start accepts. Automaton has 716 states and 1133 transitions. Word has length 59 [2022-11-16 20:10:33,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:10:33,467 INFO L495 AbstractCegarLoop]: Abstraction has 716 states and 1133 transitions. [2022-11-16 20:10:33,467 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 9.6) internal successors, (48), 5 states have internal predecessors, (48), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-11-16 20:10:33,468 INFO L276 IsEmpty]: Start isEmpty. Operand 716 states and 1133 transitions. [2022-11-16 20:10:33,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2022-11-16 20:10:33,470 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:10:33,470 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:10:33,471 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-11-16 20:10:33,471 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 20:10:33,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:10:33,472 INFO L85 PathProgramCache]: Analyzing trace with hash -765711903, now seen corresponding path program 1 times [2022-11-16 20:10:33,472 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:10:33,472 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [463196750] [2022-11-16 20:10:33,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:10:33,472 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:10:33,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:10:33,673 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-16 20:10:33,674 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:10:33,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [463196750] [2022-11-16 20:10:33,674 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [463196750] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:10:33,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [630016840] [2022-11-16 20:10:33,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:10:33,675 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:10:33,675 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80da25ef-b662-43ab-b73e-79cb720e2f52/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:10:33,678 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80da25ef-b662-43ab-b73e-79cb720e2f52/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:10:33,717 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80da25ef-b662-43ab-b73e-79cb720e2f52/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-16 20:10:33,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:10:33,946 INFO L263 TraceCheckSpWp]: Trace formula consists of 853 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-16 20:10:33,956 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:10:34,049 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-11-16 20:10:34,063 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-16 20:10:34,063 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [630016840] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 20:10:34,063 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-16 20:10:34,063 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-16 20:10:34,064 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1693431958] [2022-11-16 20:10:34,064 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 20:10:34,064 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-16 20:10:34,065 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:10:34,065 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-16 20:10:34,079 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-16 20:10:34,079 INFO L87 Difference]: Start difference. First operand 716 states and 1133 transitions. Second operand has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 2 states have internal predecessors, (73), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-16 20:10:34,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:10:34,345 INFO L93 Difference]: Finished difference Result 2120 states and 3454 transitions. [2022-11-16 20:10:34,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-16 20:10:34,346 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 2 states have internal predecessors, (73), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 116 [2022-11-16 20:10:34,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:10:34,356 INFO L225 Difference]: With dead ends: 2120 [2022-11-16 20:10:34,356 INFO L226 Difference]: Without dead ends: 1410 [2022-11-16 20:10:34,361 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-16 20:10:34,363 INFO L413 NwaCegarLoop]: 215 mSDtfsCounter, 213 mSDsluCounter, 188 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 213 SdHoareTripleChecker+Valid, 403 SdHoareTripleChecker+Invalid, 87 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 20:10:34,364 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [213 Valid, 403 Invalid, 87 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 20:10:34,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1410 states. [2022-11-16 20:10:34,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1410 to 1401. [2022-11-16 20:10:34,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1401 states, 1155 states have (on average 1.50995670995671) internal successors, (1744), 1163 states have internal predecessors, (1744), 185 states have call successors, (185), 61 states have call predecessors, (185), 60 states have return successors, (279), 177 states have call predecessors, (279), 183 states have call successors, (279) [2022-11-16 20:10:34,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1401 states to 1401 states and 2208 transitions. [2022-11-16 20:10:34,542 INFO L78 Accepts]: Start accepts. Automaton has 1401 states and 2208 transitions. Word has length 116 [2022-11-16 20:10:34,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:10:34,543 INFO L495 AbstractCegarLoop]: Abstraction has 1401 states and 2208 transitions. [2022-11-16 20:10:34,543 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 2 states have internal predecessors, (73), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-16 20:10:34,543 INFO L276 IsEmpty]: Start isEmpty. Operand 1401 states and 2208 transitions. [2022-11-16 20:10:34,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2022-11-16 20:10:34,549 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:10:34,549 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:10:34,563 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80da25ef-b662-43ab-b73e-79cb720e2f52/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-16 20:10:34,757 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80da25ef-b662-43ab-b73e-79cb720e2f52/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:10:34,758 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 20:10:34,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:10:34,758 INFO L85 PathProgramCache]: Analyzing trace with hash 1022719263, now seen corresponding path program 1 times [2022-11-16 20:10:34,758 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:10:34,759 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1578172025] [2022-11-16 20:10:34,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:10:34,759 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:10:34,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:10:34,951 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-16 20:10:34,952 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:10:34,952 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1578172025] [2022-11-16 20:10:34,952 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1578172025] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:10:34,952 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1366481130] [2022-11-16 20:10:34,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:10:34,953 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:10:34,953 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80da25ef-b662-43ab-b73e-79cb720e2f52/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:10:34,954 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80da25ef-b662-43ab-b73e-79cb720e2f52/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:10:34,975 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80da25ef-b662-43ab-b73e-79cb720e2f52/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-16 20:10:35,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:10:35,200 INFO L263 TraceCheckSpWp]: Trace formula consists of 847 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-16 20:10:35,205 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:10:35,272 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2022-11-16 20:10:35,272 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-16 20:10:35,272 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1366481130] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 20:10:35,272 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-16 20:10:35,273 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-16 20:10:35,273 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1486840694] [2022-11-16 20:10:35,273 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 20:10:35,273 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-16 20:10:35,274 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:10:35,274 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-16 20:10:35,274 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-16 20:10:35,275 INFO L87 Difference]: Start difference. First operand 1401 states and 2208 transitions. Second operand has 3 states, 3 states have (on average 25.333333333333332) internal successors, (76), 2 states have internal predecessors, (76), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-16 20:10:35,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:10:35,617 INFO L93 Difference]: Finished difference Result 4160 states and 6744 transitions. [2022-11-16 20:10:35,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-16 20:10:35,618 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.333333333333332) internal successors, (76), 2 states have internal predecessors, (76), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 116 [2022-11-16 20:10:35,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:10:35,634 INFO L225 Difference]: With dead ends: 4160 [2022-11-16 20:10:35,634 INFO L226 Difference]: Without dead ends: 2765 [2022-11-16 20:10:35,641 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-16 20:10:35,642 INFO L413 NwaCegarLoop]: 215 mSDtfsCounter, 210 mSDsluCounter, 188 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 210 SdHoareTripleChecker+Valid, 403 SdHoareTripleChecker+Invalid, 87 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 20:10:35,643 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [210 Valid, 403 Invalid, 87 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 20:10:35,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2765 states. [2022-11-16 20:10:35,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2765 to 2751. [2022-11-16 20:10:35,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2751 states, 2276 states have (on average 1.5043936731107206) internal successors, (3424), 2290 states have internal predecessors, (3424), 354 states have call successors, (354), 121 states have call predecessors, (354), 120 states have return successors, (536), 340 states have call predecessors, (536), 352 states have call successors, (536) [2022-11-16 20:10:35,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2751 states to 2751 states and 4314 transitions. [2022-11-16 20:10:35,898 INFO L78 Accepts]: Start accepts. Automaton has 2751 states and 4314 transitions. Word has length 116 [2022-11-16 20:10:35,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:10:35,898 INFO L495 AbstractCegarLoop]: Abstraction has 2751 states and 4314 transitions. [2022-11-16 20:10:35,899 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.333333333333332) internal successors, (76), 2 states have internal predecessors, (76), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-16 20:10:35,899 INFO L276 IsEmpty]: Start isEmpty. Operand 2751 states and 4314 transitions. [2022-11-16 20:10:35,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2022-11-16 20:10:35,906 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:10:35,906 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:10:35,917 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80da25ef-b662-43ab-b73e-79cb720e2f52/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-11-16 20:10:36,112 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80da25ef-b662-43ab-b73e-79cb720e2f52/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-11-16 20:10:36,113 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 20:10:36,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:10:36,113 INFO L85 PathProgramCache]: Analyzing trace with hash 1266426529, now seen corresponding path program 1 times [2022-11-16 20:10:36,114 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:10:36,114 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1682953943] [2022-11-16 20:10:36,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:10:36,114 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:10:36,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:10:36,289 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-16 20:10:36,289 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:10:36,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1682953943] [2022-11-16 20:10:36,289 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1682953943] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:10:36,290 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [425712836] [2022-11-16 20:10:36,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:10:36,290 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:10:36,290 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80da25ef-b662-43ab-b73e-79cb720e2f52/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:10:36,291 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80da25ef-b662-43ab-b73e-79cb720e2f52/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:10:36,311 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80da25ef-b662-43ab-b73e-79cb720e2f52/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-16 20:10:36,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:10:36,519 INFO L263 TraceCheckSpWp]: Trace formula consists of 841 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-16 20:10:36,522 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:10:36,586 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 26 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-16 20:10:36,587 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-16 20:10:36,587 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [425712836] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 20:10:36,587 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-16 20:10:36,587 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-16 20:10:36,588 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [542008442] [2022-11-16 20:10:36,588 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 20:10:36,588 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-16 20:10:36,588 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:10:36,589 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-16 20:10:36,589 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-16 20:10:36,589 INFO L87 Difference]: Start difference. First operand 2751 states and 4314 transitions. Second operand has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 2 states have internal predecessors, (88), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-16 20:10:37,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:10:37,145 INFO L93 Difference]: Finished difference Result 8180 states and 13183 transitions. [2022-11-16 20:10:37,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-16 20:10:37,146 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 2 states have internal predecessors, (88), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 116 [2022-11-16 20:10:37,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:10:37,181 INFO L225 Difference]: With dead ends: 8180 [2022-11-16 20:10:37,182 INFO L226 Difference]: Without dead ends: 5435 [2022-11-16 20:10:37,196 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-16 20:10:37,197 INFO L413 NwaCegarLoop]: 215 mSDtfsCounter, 198 mSDsluCounter, 188 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 198 SdHoareTripleChecker+Valid, 403 SdHoareTripleChecker+Invalid, 87 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 20:10:37,197 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [198 Valid, 403 Invalid, 87 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 20:10:37,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5435 states. [2022-11-16 20:10:37,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5435 to 5411. [2022-11-16 20:10:37,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5411 states, 4488 states have (on average 1.4982174688057042) internal successors, (6724), 4514 states have internal predecessors, (6724), 682 states have call successors, (682), 241 states have call predecessors, (682), 240 states have return successors, (1032), 656 states have call predecessors, (1032), 680 states have call successors, (1032) [2022-11-16 20:10:37,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5411 states to 5411 states and 8438 transitions. [2022-11-16 20:10:37,668 INFO L78 Accepts]: Start accepts. Automaton has 5411 states and 8438 transitions. Word has length 116 [2022-11-16 20:10:37,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:10:37,669 INFO L495 AbstractCegarLoop]: Abstraction has 5411 states and 8438 transitions. [2022-11-16 20:10:37,669 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 2 states have internal predecessors, (88), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-16 20:10:37,669 INFO L276 IsEmpty]: Start isEmpty. Operand 5411 states and 8438 transitions. [2022-11-16 20:10:37,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2022-11-16 20:10:37,677 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:10:37,678 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:10:37,692 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80da25ef-b662-43ab-b73e-79cb720e2f52/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-16 20:10:37,884 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80da25ef-b662-43ab-b73e-79cb720e2f52/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:10:37,885 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 20:10:37,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:10:37,885 INFO L85 PathProgramCache]: Analyzing trace with hash 1149862691, now seen corresponding path program 1 times [2022-11-16 20:10:37,885 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:10:37,886 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [104375064] [2022-11-16 20:10:37,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:10:37,886 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:10:37,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:10:38,106 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-16 20:10:38,106 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:10:38,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [104375064] [2022-11-16 20:10:38,110 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [104375064] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:10:38,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1550496136] [2022-11-16 20:10:38,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:10:38,111 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:10:38,111 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80da25ef-b662-43ab-b73e-79cb720e2f52/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:10:38,115 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80da25ef-b662-43ab-b73e-79cb720e2f52/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:10:38,139 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80da25ef-b662-43ab-b73e-79cb720e2f52/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-16 20:10:38,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:10:38,346 INFO L263 TraceCheckSpWp]: Trace formula consists of 835 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-16 20:10:38,349 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:10:38,422 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 20 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-16 20:10:38,422 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-16 20:10:38,423 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1550496136] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 20:10:38,423 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-16 20:10:38,423 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-16 20:10:38,423 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [275819565] [2022-11-16 20:10:38,423 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 20:10:38,424 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-16 20:10:38,424 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:10:38,424 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-16 20:10:38,424 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-16 20:10:38,425 INFO L87 Difference]: Start difference. First operand 5411 states and 8438 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 2 states have internal predecessors, (82), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-16 20:10:39,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:10:39,395 INFO L93 Difference]: Finished difference Result 16100 states and 25779 transitions. [2022-11-16 20:10:39,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-16 20:10:39,396 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 2 states have internal predecessors, (82), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 116 [2022-11-16 20:10:39,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:10:39,468 INFO L225 Difference]: With dead ends: 16100 [2022-11-16 20:10:39,468 INFO L226 Difference]: Without dead ends: 10695 [2022-11-16 20:10:39,495 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-16 20:10:39,497 INFO L413 NwaCegarLoop]: 215 mSDtfsCounter, 204 mSDsluCounter, 188 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 204 SdHoareTripleChecker+Valid, 403 SdHoareTripleChecker+Invalid, 87 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 20:10:39,497 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [204 Valid, 403 Invalid, 87 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 20:10:39,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10695 states. [2022-11-16 20:10:40,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10695 to 10651. [2022-11-16 20:10:40,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10651 states, 8852 states have (on average 1.491640307275192) internal successors, (13204), 8902 states have internal predecessors, (13204), 1318 states have call successors, (1318), 481 states have call predecessors, (1318), 480 states have return successors, (1988), 1268 states have call predecessors, (1988), 1316 states have call successors, (1988) [2022-11-16 20:10:40,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10651 states to 10651 states and 16510 transitions. [2022-11-16 20:10:40,473 INFO L78 Accepts]: Start accepts. Automaton has 10651 states and 16510 transitions. Word has length 116 [2022-11-16 20:10:40,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:10:40,474 INFO L495 AbstractCegarLoop]: Abstraction has 10651 states and 16510 transitions. [2022-11-16 20:10:40,475 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 2 states have internal predecessors, (82), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-16 20:10:40,475 INFO L276 IsEmpty]: Start isEmpty. Operand 10651 states and 16510 transitions. [2022-11-16 20:10:40,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2022-11-16 20:10:40,495 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:10:40,495 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:10:40,506 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80da25ef-b662-43ab-b73e-79cb720e2f52/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-16 20:10:40,701 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80da25ef-b662-43ab-b73e-79cb720e2f52/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:10:40,702 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 20:10:40,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:10:40,702 INFO L85 PathProgramCache]: Analyzing trace with hash -1292305883, now seen corresponding path program 1 times [2022-11-16 20:10:40,702 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:10:40,702 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1486324923] [2022-11-16 20:10:40,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:10:40,703 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:10:40,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:10:40,836 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2022-11-16 20:10:40,836 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:10:40,837 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1486324923] [2022-11-16 20:10:40,837 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1486324923] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 20:10:40,837 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 20:10:40,837 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-16 20:10:40,837 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [191723134] [2022-11-16 20:10:40,837 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 20:10:40,838 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-16 20:10:40,838 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:10:40,838 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-16 20:10:40,839 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-16 20:10:40,839 INFO L87 Difference]: Start difference. First operand 10651 states and 16510 transitions. Second operand has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 3 states have internal predecessors, (67), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-11-16 20:10:42,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:10:42,086 INFO L93 Difference]: Finished difference Result 21599 states and 34289 transitions. [2022-11-16 20:10:42,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-16 20:10:42,087 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 3 states have internal predecessors, (67), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 116 [2022-11-16 20:10:42,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:10:42,188 INFO L225 Difference]: With dead ends: 21599 [2022-11-16 20:10:42,188 INFO L226 Difference]: Without dead ends: 13051 [2022-11-16 20:10:42,229 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 [2022-11-16 20:10:42,230 INFO L413 NwaCegarLoop]: 302 mSDtfsCounter, 101 mSDsluCounter, 207 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 101 SdHoareTripleChecker+Valid, 509 SdHoareTripleChecker+Invalid, 106 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 20:10:42,231 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [101 Valid, 509 Invalid, 106 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 20:10:42,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13051 states. [2022-11-16 20:10:43,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13051 to 12235. [2022-11-16 20:10:43,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12235 states, 10372 states have (on average 1.527574238333976) internal successors, (15844), 10422 states have internal predecessors, (15844), 1350 states have call successors, (1350), 513 states have call predecessors, (1350), 512 states have return successors, (2020), 1300 states have call predecessors, (2020), 1348 states have call successors, (2020) [2022-11-16 20:10:43,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12235 states to 12235 states and 19214 transitions. [2022-11-16 20:10:43,336 INFO L78 Accepts]: Start accepts. Automaton has 12235 states and 19214 transitions. Word has length 116 [2022-11-16 20:10:43,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:10:43,336 INFO L495 AbstractCegarLoop]: Abstraction has 12235 states and 19214 transitions. [2022-11-16 20:10:43,337 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 3 states have internal predecessors, (67), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-11-16 20:10:43,337 INFO L276 IsEmpty]: Start isEmpty. Operand 12235 states and 19214 transitions. [2022-11-16 20:10:43,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2022-11-16 20:10:43,373 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:10:43,374 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2022-11-16 20:10:43,374 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2022-11-16 20:10:43,374 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 20:10:43,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:10:43,375 INFO L85 PathProgramCache]: Analyzing trace with hash 1318565842, now seen corresponding path program 1 times [2022-11-16 20:10:43,375 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:10:43,375 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [412334820] [2022-11-16 20:10:43,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:10:43,376 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:10:43,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:10:43,499 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 99 trivial. 0 not checked. [2022-11-16 20:10:43,499 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:10:43,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [412334820] [2022-11-16 20:10:43,499 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [412334820] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 20:10:43,499 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 20:10:43,500 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-16 20:10:43,500 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1249509424] [2022-11-16 20:10:43,500 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 20:10:43,501 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-16 20:10:43,502 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:10:43,502 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-16 20:10:43,502 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-16 20:10:43,503 INFO L87 Difference]: Start difference. First operand 12235 states and 19214 transitions. Second operand has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2022-11-16 20:10:45,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:10:45,467 INFO L93 Difference]: Finished difference Result 36340 states and 58295 transitions. [2022-11-16 20:10:45,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-16 20:10:45,468 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 157 [2022-11-16 20:10:45,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:10:45,592 INFO L225 Difference]: With dead ends: 36340 [2022-11-16 20:10:45,593 INFO L226 Difference]: Without dead ends: 24111 [2022-11-16 20:10:45,641 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 [2022-11-16 20:10:45,642 INFO L413 NwaCegarLoop]: 217 mSDtfsCounter, 202 mSDsluCounter, 188 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 202 SdHoareTripleChecker+Valid, 405 SdHoareTripleChecker+Invalid, 85 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 20:10:45,642 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [202 Valid, 405 Invalid, 85 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 20:10:45,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24111 states. [2022-11-16 20:10:47,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24111 to 23995. [2022-11-16 20:10:47,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23995 states, 20356 states have (on average 1.5187659658086068) internal successors, (30916), 20454 states have internal predecessors, (30916), 2614 states have call successors, (2614), 1025 states have call predecessors, (2614), 1024 states have return successors, (3892), 2516 states have call predecessors, (3892), 2612 states have call successors, (3892) [2022-11-16 20:10:47,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23995 states to 23995 states and 37422 transitions. [2022-11-16 20:10:47,576 INFO L78 Accepts]: Start accepts. Automaton has 23995 states and 37422 transitions. Word has length 157 [2022-11-16 20:10:47,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:10:47,576 INFO L495 AbstractCegarLoop]: Abstraction has 23995 states and 37422 transitions. [2022-11-16 20:10:47,577 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2022-11-16 20:10:47,577 INFO L276 IsEmpty]: Start isEmpty. Operand 23995 states and 37422 transitions. [2022-11-16 20:10:47,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2022-11-16 20:10:47,650 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:10:47,650 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2022-11-16 20:10:47,651 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2022-11-16 20:10:47,651 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 20:10:47,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:10:47,652 INFO L85 PathProgramCache]: Analyzing trace with hash 455584564, now seen corresponding path program 1 times [2022-11-16 20:10:47,652 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:10:47,652 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2026758651] [2022-11-16 20:10:47,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:10:47,652 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:10:47,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:10:47,753 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 99 trivial. 0 not checked. [2022-11-16 20:10:47,754 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:10:47,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2026758651] [2022-11-16 20:10:47,754 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2026758651] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 20:10:47,754 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 20:10:47,754 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-16 20:10:47,755 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [983247592] [2022-11-16 20:10:47,755 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 20:10:47,755 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-16 20:10:47,755 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:10:47,756 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-16 20:10:47,756 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-16 20:10:47,756 INFO L87 Difference]: Start difference. First operand 23995 states and 37422 transitions. Second operand has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2022-11-16 20:10:51,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:10:51,134 INFO L93 Difference]: Finished difference Result 71268 states and 113447 transitions. [2022-11-16 20:10:51,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-16 20:10:51,135 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 157 [2022-11-16 20:10:51,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:10:51,336 INFO L225 Difference]: With dead ends: 71268 [2022-11-16 20:10:51,336 INFO L226 Difference]: Without dead ends: 47279 [2022-11-16 20:10:51,583 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 [2022-11-16 20:10:51,584 INFO L413 NwaCegarLoop]: 217 mSDtfsCounter, 204 mSDsluCounter, 188 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 204 SdHoareTripleChecker+Valid, 405 SdHoareTripleChecker+Invalid, 85 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 20:10:51,584 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [204 Valid, 405 Invalid, 85 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 20:10:51,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47279 states. [2022-11-16 20:10:54,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47279 to 47051. [2022-11-16 20:10:54,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47051 states, 39940 states have (on average 1.5095643465197797) internal successors, (60292), 40134 states have internal predecessors, (60292), 5062 states have call successors, (5062), 2049 states have call predecessors, (5062), 2048 states have return successors, (7492), 4868 states have call predecessors, (7492), 5060 states have call successors, (7492) [2022-11-16 20:10:55,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47051 states to 47051 states and 72846 transitions. [2022-11-16 20:10:55,043 INFO L78 Accepts]: Start accepts. Automaton has 47051 states and 72846 transitions. Word has length 157 [2022-11-16 20:10:55,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:10:55,044 INFO L495 AbstractCegarLoop]: Abstraction has 47051 states and 72846 transitions. [2022-11-16 20:10:55,044 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2022-11-16 20:10:55,044 INFO L276 IsEmpty]: Start isEmpty. Operand 47051 states and 72846 transitions. [2022-11-16 20:10:55,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2022-11-16 20:10:55,159 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:10:55,160 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2022-11-16 20:10:55,160 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2022-11-16 20:10:55,160 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 20:10:55,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:10:55,161 INFO L85 PathProgramCache]: Analyzing trace with hash 1114194710, now seen corresponding path program 1 times [2022-11-16 20:10:55,161 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:10:55,161 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1927955057] [2022-11-16 20:10:55,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:10:55,162 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:10:55,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:10:55,309 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 99 trivial. 0 not checked. [2022-11-16 20:10:55,309 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:10:55,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1927955057] [2022-11-16 20:10:55,309 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1927955057] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 20:10:55,310 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 20:10:55,310 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-16 20:10:55,310 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1257672154] [2022-11-16 20:10:55,310 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 20:10:55,311 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-16 20:10:55,311 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:10:55,311 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-16 20:10:55,312 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-16 20:10:55,312 INFO L87 Difference]: Start difference. First operand 47051 states and 72846 transitions. Second operand has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2022-11-16 20:11:01,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:11:01,136 INFO L93 Difference]: Finished difference Result 139732 states and 220631 transitions. [2022-11-16 20:11:01,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-16 20:11:01,136 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 157 [2022-11-16 20:11:01,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:11:01,540 INFO L225 Difference]: With dead ends: 139732 [2022-11-16 20:11:01,540 INFO L226 Difference]: Without dead ends: 92687 [2022-11-16 20:11:01,919 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 [2022-11-16 20:11:01,920 INFO L413 NwaCegarLoop]: 217 mSDtfsCounter, 206 mSDsluCounter, 188 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 206 SdHoareTripleChecker+Valid, 405 SdHoareTripleChecker+Invalid, 85 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-16 20:11:01,920 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [206 Valid, 405 Invalid, 85 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-16 20:11:01,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92687 states. [2022-11-16 20:11:07,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92687 to 92235. [2022-11-16 20:11:07,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92235 states, 78340 states have (on average 1.4999744702578504) internal successors, (117508), 78726 states have internal predecessors, (117508), 9798 states have call successors, (9798), 4097 states have call predecessors, (9798), 4096 states have return successors, (14404), 9412 states have call predecessors, (14404), 9796 states have call successors, (14404) [2022-11-16 20:11:08,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92235 states to 92235 states and 141710 transitions. [2022-11-16 20:11:08,701 INFO L78 Accepts]: Start accepts. Automaton has 92235 states and 141710 transitions. Word has length 157 [2022-11-16 20:11:08,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:11:08,702 INFO L495 AbstractCegarLoop]: Abstraction has 92235 states and 141710 transitions. [2022-11-16 20:11:08,702 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2022-11-16 20:11:08,702 INFO L276 IsEmpty]: Start isEmpty. Operand 92235 states and 141710 transitions. [2022-11-16 20:11:08,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2022-11-16 20:11:08,942 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:11:08,943 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2022-11-16 20:11:08,943 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2022-11-16 20:11:08,943 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 20:11:08,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:11:08,944 INFO L85 PathProgramCache]: Analyzing trace with hash -607371350, now seen corresponding path program 1 times [2022-11-16 20:11:08,944 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:11:08,944 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1877718822] [2022-11-16 20:11:08,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:11:08,945 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:11:08,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:11:09,084 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 99 trivial. 0 not checked. [2022-11-16 20:11:09,084 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:11:09,084 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1877718822] [2022-11-16 20:11:09,084 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1877718822] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 20:11:09,085 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 20:11:09,085 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-16 20:11:09,085 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2099944176] [2022-11-16 20:11:09,085 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 20:11:09,086 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-16 20:11:09,086 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:11:09,086 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-16 20:11:09,087 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-16 20:11:09,087 INFO L87 Difference]: Start difference. First operand 92235 states and 141710 transitions. Second operand has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9)