./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.10.cil-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 2329fc70 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.10.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh --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 fe6bee847a7b573239a2f60b60a87297f25c539812daa07adcb7591b7977879b --- 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-2329fc7 [2022-12-14 12:12:40,253 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 12:12:40,255 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 12:12:40,267 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 12:12:40,267 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 12:12:40,268 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 12:12:40,269 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 12:12:40,270 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 12:12:40,271 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 12:12:40,271 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 12:12:40,272 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 12:12:40,273 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 12:12:40,273 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 12:12:40,273 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 12:12:40,274 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 12:12:40,275 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 12:12:40,275 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 12:12:40,276 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 12:12:40,277 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 12:12:40,278 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 12:12:40,279 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 12:12:40,280 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 12:12:40,280 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 12:12:40,281 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 12:12:40,283 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 12:12:40,283 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 12:12:40,283 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 12:12:40,284 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 12:12:40,284 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 12:12:40,284 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 12:12:40,285 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 12:12:40,285 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 12:12:40,285 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 12:12:40,286 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 12:12:40,286 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 12:12:40,287 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 12:12:40,287 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 12:12:40,287 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 12:12:40,287 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 12:12:40,288 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 12:12:40,288 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 12:12:40,289 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-12-14 12:12:40,303 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 12:12:40,303 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 12:12:40,303 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 12:12:40,303 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 12:12:40,304 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 12:12:40,304 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 12:12:40,304 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 12:12:40,304 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 12:12:40,304 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 12:12:40,312 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 12:12:40,312 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 12:12:40,312 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 12:12:40,313 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 12:12:40,313 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 12:12:40,313 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 12:12:40,313 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 12:12:40,313 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 12:12:40,313 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 12:12:40,314 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 12:12:40,314 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-14 12:12:40,314 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 12:12:40,315 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-14 12:12:40,315 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 12:12:40,315 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-12-14 12:12:40,315 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 12:12:40,315 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-12-14 12:12:40,315 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-14 12:12:40,316 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-12-14 12:12:40,316 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 12:12:40,316 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-12-14 12:12:40,316 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 12:12:40,316 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 12:12:40,316 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 12:12:40,317 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 12:12:40,317 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 12:12:40,317 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 12:12:40,317 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-12-14 12:12:40,317 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 12:12:40,317 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 12:12:40,318 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-12-14 12:12:40,318 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 12:12:40,318 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_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> fe6bee847a7b573239a2f60b60a87297f25c539812daa07adcb7591b7977879b [2022-12-14 12:12:40,485 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 12:12:40,504 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 12:12:40,506 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 12:12:40,506 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 12:12:40,507 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 12:12:40,508 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.10.cil-1.c [2022-12-14 12:12:43,046 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 12:12:43,199 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 12:12:43,199 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.10.cil-1.c [2022-12-14 12:12:43,208 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/data/47a1ef706/11d3d65c5c164240ac7d9d6c95a1555b/FLAG5049d62dd [2022-12-14 12:12:43,603 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/data/47a1ef706/11d3d65c5c164240ac7d9d6c95a1555b [2022-12-14 12:12:43,605 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 12:12:43,606 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 12:12:43,607 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 12:12:43,607 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 12:12:43,610 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 12:12:43,610 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 12:12:43" (1/1) ... [2022-12-14 12:12:43,611 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@622db283 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:12:43, skipping insertion in model container [2022-12-14 12:12:43,611 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 12:12:43" (1/1) ... [2022-12-14 12:12:43,616 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 12:12:43,645 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 12:12:43,741 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.10.cil-1.c[913,926] [2022-12-14 12:12:43,771 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.10.cil-1.c[5977,5990] [2022-12-14 12:12:43,830 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 12:12:43,839 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 12:12:43,847 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.10.cil-1.c[913,926] [2022-12-14 12:12:43,857 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.10.cil-1.c[5977,5990] [2022-12-14 12:12:43,896 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 12:12:43,910 INFO L208 MainTranslator]: Completed translation [2022-12-14 12:12:43,910 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:12:43 WrapperNode [2022-12-14 12:12:43,910 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 12:12:43,911 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 12:12:43,911 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 12:12:43,911 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 12:12:43,916 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:12:43" (1/1) ... [2022-12-14 12:12:43,925 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:12:43" (1/1) ... [2022-12-14 12:12:43,954 INFO L138 Inliner]: procedures = 68, calls = 79, calls flagged for inlining = 42, calls inlined = 42, statements flattened = 944 [2022-12-14 12:12:43,954 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 12:12:43,954 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 12:12:43,954 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 12:12:43,955 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 12:12:43,961 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:12:43" (1/1) ... [2022-12-14 12:12:43,961 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:12:43" (1/1) ... [2022-12-14 12:12:43,964 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:12:43" (1/1) ... [2022-12-14 12:12:43,964 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:12:43" (1/1) ... [2022-12-14 12:12:43,972 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:12:43" (1/1) ... [2022-12-14 12:12:43,980 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:12:43" (1/1) ... [2022-12-14 12:12:43,982 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:12:43" (1/1) ... [2022-12-14 12:12:43,984 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:12:43" (1/1) ... [2022-12-14 12:12:43,988 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 12:12:43,989 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 12:12:43,989 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 12:12:43,989 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 12:12:43,989 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:12:43" (1/1) ... [2022-12-14 12:12:43,994 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 12:12:44,002 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:12:44,012 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 12:12:44,014 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 12:12:44,048 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-14 12:12:44,048 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2022-12-14 12:12:44,048 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2022-12-14 12:12:44,048 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify_threads [2022-12-14 12:12:44,049 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify_threads [2022-12-14 12:12:44,049 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread1 [2022-12-14 12:12:44,049 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread1 [2022-12-14 12:12:44,049 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread2 [2022-12-14 12:12:44,049 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread2 [2022-12-14 12:12:44,049 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events2 [2022-12-14 12:12:44,049 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events2 [2022-12-14 12:12:44,050 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads2 [2022-12-14 12:12:44,050 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads2 [2022-12-14 12:12:44,050 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels2 [2022-12-14 12:12:44,050 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels2 [2022-12-14 12:12:44,050 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-12-14 12:12:44,050 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events2 [2022-12-14 12:12:44,060 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events2 [2022-12-14 12:12:44,060 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 12:12:44,060 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 12:12:44,061 INFO L130 BoogieDeclarations]: Found specification of procedure error1 [2022-12-14 12:12:44,061 INFO L138 BoogieDeclarations]: Found implementation of procedure error1 [2022-12-14 12:12:44,062 INFO L130 BoogieDeclarations]: Found specification of procedure error2 [2022-12-14 12:12:44,062 INFO L138 BoogieDeclarations]: Found implementation of procedure error2 [2022-12-14 12:12:44,175 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 12:12:44,177 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 12:12:44,764 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 12:12:45,134 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 12:12:45,135 INFO L300 CfgBuilder]: Removed 17 assume(true) statements. [2022-12-14 12:12:45,138 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 12:12:45 BoogieIcfgContainer [2022-12-14 12:12:45,138 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 12:12:45,140 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 12:12:45,140 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 12:12:45,143 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 12:12:45,144 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 12:12:43" (1/3) ... [2022-12-14 12:12:45,144 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2c700124 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 12:12:45, skipping insertion in model container [2022-12-14 12:12:45,144 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:12:43" (2/3) ... [2022-12-14 12:12:45,145 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2c700124 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 12:12:45, skipping insertion in model container [2022-12-14 12:12:45,145 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 12:12:45" (3/3) ... [2022-12-14 12:12:45,146 INFO L112 eAbstractionObserver]: Analyzing ICFG pc_sfifo_1.cil-2+token_ring.10.cil-1.c [2022-12-14 12:12:45,165 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 12:12:45,166 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2022-12-14 12:12:45,217 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 12:12:45,223 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;@505af2b9, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 12:12:45,223 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2022-12-14 12:12:45,228 INFO L276 IsEmpty]: Start isEmpty. Operand has 223 states, 178 states have (on average 1.5674157303370786) internal successors, (279), 185 states have internal predecessors, (279), 32 states have call successors, (32), 10 states have call predecessors, (32), 10 states have return successors, (32), 30 states have call predecessors, (32), 32 states have call successors, (32) [2022-12-14 12:12:45,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-12-14 12:12:45,236 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:12:45,236 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] [2022-12-14 12:12:45,237 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:12:45,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:12:45,241 INFO L85 PathProgramCache]: Analyzing trace with hash 88463459, now seen corresponding path program 1 times [2022-12-14 12:12:45,247 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:12:45,248 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1031202846] [2022-12-14 12:12:45,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:12:45,248 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:12:45,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:12:45,484 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:12:45,484 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:12:45,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1031202846] [2022-12-14 12:12:45,485 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1031202846] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 12:12:45,485 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 12:12:45,485 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 12:12:45,487 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1958332299] [2022-12-14 12:12:45,487 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 12:12:45,491 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 12:12:45,492 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:12:45,519 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 12:12:45,519 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 12:12:45,522 INFO L87 Difference]: Start difference. First operand has 223 states, 178 states have (on average 1.5674157303370786) internal successors, (279), 185 states have internal predecessors, (279), 32 states have call successors, (32), 10 states have call predecessors, (32), 10 states have return successors, (32), 30 states have call predecessors, (32), 32 states have call successors, (32) Second operand has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-12-14 12:12:45,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:12:45,701 INFO L93 Difference]: Finished difference Result 478 states and 734 transitions. [2022-12-14 12:12:45,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 12:12:45,704 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 28 [2022-12-14 12:12:45,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:12:45,713 INFO L225 Difference]: With dead ends: 478 [2022-12-14 12:12:45,714 INFO L226 Difference]: Without dead ends: 255 [2022-12-14 12:12:45,718 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 [2022-12-14 12:12:45,720 INFO L413 NwaCegarLoop]: 290 mSDtfsCounter, 308 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 308 SdHoareTripleChecker+Valid, 345 SdHoareTripleChecker+Invalid, 80 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 12:12:45,721 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [308 Valid, 345 Invalid, 80 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 12:12:45,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 255 states. [2022-12-14 12:12:45,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 255 to 251. [2022-12-14 12:12:45,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 251 states, 204 states have (on average 1.5) internal successors, (306), 208 states have internal predecessors, (306), 35 states have call successors, (35), 12 states have call predecessors, (35), 10 states have return successors, (31), 31 states have call predecessors, (31), 31 states have call successors, (31) [2022-12-14 12:12:45,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 372 transitions. [2022-12-14 12:12:45,780 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 372 transitions. Word has length 28 [2022-12-14 12:12:45,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:12:45,781 INFO L495 AbstractCegarLoop]: Abstraction has 251 states and 372 transitions. [2022-12-14 12:12:45,781 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-12-14 12:12:45,781 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 372 transitions. [2022-12-14 12:12:45,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-12-14 12:12:45,783 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:12:45,784 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] [2022-12-14 12:12:45,784 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-12-14 12:12:45,784 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:12:45,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:12:45,785 INFO L85 PathProgramCache]: Analyzing trace with hash -803991760, now seen corresponding path program 1 times [2022-12-14 12:12:45,785 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:12:45,785 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1766844306] [2022-12-14 12:12:45,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:12:45,786 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:12:45,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:12:45,835 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:12:45,835 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:12:45,835 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1766844306] [2022-12-14 12:12:45,836 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1766844306] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 12:12:45,836 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 12:12:45,836 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 12:12:45,836 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1737609901] [2022-12-14 12:12:45,836 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 12:12:45,837 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 12:12:45,837 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:12:45,837 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 12:12:45,838 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 12:12:45,838 INFO L87 Difference]: Start difference. First operand 251 states and 372 transitions. Second operand has 3 states, 3 states have (on average 8.0) internal successors, (24), 3 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-12-14 12:12:45,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:12:45,955 INFO L93 Difference]: Finished difference Result 407 states and 589 transitions. [2022-12-14 12:12:45,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 12:12:45,956 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 8.0) internal successors, (24), 3 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 29 [2022-12-14 12:12:45,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:12:45,959 INFO L225 Difference]: With dead ends: 407 [2022-12-14 12:12:45,960 INFO L226 Difference]: Without dead ends: 326 [2022-12-14 12:12:45,960 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 [2022-12-14 12:12:45,961 INFO L413 NwaCegarLoop]: 277 mSDtfsCounter, 306 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 306 SdHoareTripleChecker+Valid, 330 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 12:12:45,961 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [306 Valid, 330 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 12:12:45,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 326 states. [2022-12-14 12:12:45,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 326 to 322. [2022-12-14 12:12:45,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 322 states, 264 states have (on average 1.4659090909090908) internal successors, (387), 268 states have internal predecessors, (387), 42 states have call successors, (42), 16 states have call predecessors, (42), 14 states have return successors, (38), 38 states have call predecessors, (38), 38 states have call successors, (38) [2022-12-14 12:12:45,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 322 states to 322 states and 467 transitions. [2022-12-14 12:12:45,983 INFO L78 Accepts]: Start accepts. Automaton has 322 states and 467 transitions. Word has length 29 [2022-12-14 12:12:45,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:12:45,983 INFO L495 AbstractCegarLoop]: Abstraction has 322 states and 467 transitions. [2022-12-14 12:12:45,983 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 8.0) internal successors, (24), 3 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-12-14 12:12:45,984 INFO L276 IsEmpty]: Start isEmpty. Operand 322 states and 467 transitions. [2022-12-14 12:12:45,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-12-14 12:12:45,984 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:12:45,985 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] [2022-12-14 12:12:45,985 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-12-14 12:12:45,985 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:12:45,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:12:45,985 INFO L85 PathProgramCache]: Analyzing trace with hash 870984232, now seen corresponding path program 1 times [2022-12-14 12:12:45,985 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:12:45,985 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [249484873] [2022-12-14 12:12:45,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:12:45,986 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:12:45,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:12:46,022 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:12:46,022 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:12:46,022 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [249484873] [2022-12-14 12:12:46,023 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [249484873] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 12:12:46,023 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 12:12:46,023 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 12:12:46,023 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1690819506] [2022-12-14 12:12:46,023 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 12:12:46,024 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 12:12:46,024 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:12:46,024 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 12:12:46,024 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 12:12:46,025 INFO L87 Difference]: Start difference. First operand 322 states and 467 transitions. Second operand has 3 states, 3 states have (on average 8.333333333333334) internal successors, (25), 3 states have internal predecessors, (25), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-12-14 12:12:46,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:12:46,136 INFO L93 Difference]: Finished difference Result 562 states and 795 transitions. [2022-12-14 12:12:46,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 12:12:46,137 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 8.333333333333334) internal successors, (25), 3 states have internal predecessors, (25), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 30 [2022-12-14 12:12:46,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:12:46,140 INFO L225 Difference]: With dead ends: 562 [2022-12-14 12:12:46,140 INFO L226 Difference]: Without dead ends: 410 [2022-12-14 12:12:46,141 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 [2022-12-14 12:12:46,142 INFO L413 NwaCegarLoop]: 287 mSDtfsCounter, 46 mSDsluCounter, 258 mSDsCounter, 0 mSdLazyCounter, 107 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 545 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 107 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 12:12:46,143 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [46 Valid, 545 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 107 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 12:12:46,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 410 states. [2022-12-14 12:12:46,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 410 to 396. [2022-12-14 12:12:46,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 396 states, 327 states have (on average 1.4434250764525993) internal successors, (472), 333 states have internal predecessors, (472), 48 states have call successors, (48), 21 states have call predecessors, (48), 19 states have return successors, (44), 42 states have call predecessors, (44), 44 states have call successors, (44) [2022-12-14 12:12:46,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 396 states to 396 states and 564 transitions. [2022-12-14 12:12:46,173 INFO L78 Accepts]: Start accepts. Automaton has 396 states and 564 transitions. Word has length 30 [2022-12-14 12:12:46,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:12:46,173 INFO L495 AbstractCegarLoop]: Abstraction has 396 states and 564 transitions. [2022-12-14 12:12:46,173 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 8.333333333333334) internal successors, (25), 3 states have internal predecessors, (25), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-12-14 12:12:46,173 INFO L276 IsEmpty]: Start isEmpty. Operand 396 states and 564 transitions. [2022-12-14 12:12:46,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-12-14 12:12:46,175 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:12:46,175 INFO L195 NwaCegarLoop]: trace histogram [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] [2022-12-14 12:12:46,175 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-12-14 12:12:46,176 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:12:46,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:12:46,176 INFO L85 PathProgramCache]: Analyzing trace with hash 1172959241, now seen corresponding path program 1 times [2022-12-14 12:12:46,176 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:12:46,176 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [724457128] [2022-12-14 12:12:46,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:12:46,177 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:12:46,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:12:46,233 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 12:12:46,234 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:12:46,234 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [724457128] [2022-12-14 12:12:46,234 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [724457128] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 12:12:46,234 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 12:12:46,234 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 12:12:46,234 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [310941249] [2022-12-14 12:12:46,234 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 12:12:46,235 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 12:12:46,235 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:12:46,235 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 12:12:46,235 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 12:12:46,236 INFO L87 Difference]: Start difference. First operand 396 states and 564 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, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-12-14 12:12:46,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:12:46,347 INFO L93 Difference]: Finished difference Result 559 states and 782 transitions. [2022-12-14 12:12:46,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 12:12:46,348 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, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 43 [2022-12-14 12:12:46,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:12:46,350 INFO L225 Difference]: With dead ends: 559 [2022-12-14 12:12:46,350 INFO L226 Difference]: Without dead ends: 401 [2022-12-14 12:12:46,351 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 [2022-12-14 12:12:46,352 INFO L413 NwaCegarLoop]: 306 mSDtfsCounter, 32 mSDsluCounter, 271 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 577 SdHoareTripleChecker+Invalid, 110 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 12:12:46,352 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 577 Invalid, 110 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 12:12:46,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 401 states. [2022-12-14 12:12:46,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 401 to 390. [2022-12-14 12:12:46,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 390 states, 321 states have (on average 1.426791277258567) internal successors, (458), 327 states have internal predecessors, (458), 48 states have call successors, (48), 21 states have call predecessors, (48), 19 states have return successors, (44), 42 states have call predecessors, (44), 44 states have call successors, (44) [2022-12-14 12:12:46,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 390 states to 390 states and 550 transitions. [2022-12-14 12:12:46,367 INFO L78 Accepts]: Start accepts. Automaton has 390 states and 550 transitions. Word has length 43 [2022-12-14 12:12:46,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:12:46,367 INFO L495 AbstractCegarLoop]: Abstraction has 390 states and 550 transitions. [2022-12-14 12:12:46,367 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, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-12-14 12:12:46,367 INFO L276 IsEmpty]: Start isEmpty. Operand 390 states and 550 transitions. [2022-12-14 12:12:46,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-12-14 12:12:46,368 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:12:46,368 INFO L195 NwaCegarLoop]: trace histogram [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] [2022-12-14 12:12:46,369 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-12-14 12:12:46,369 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:12:46,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:12:46,369 INFO L85 PathProgramCache]: Analyzing trace with hash -730409120, now seen corresponding path program 1 times [2022-12-14 12:12:46,369 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:12:46,369 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2047998554] [2022-12-14 12:12:46,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:12:46,370 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:12:46,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:12:46,402 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-12-14 12:12:46,403 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:12:46,403 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2047998554] [2022-12-14 12:12:46,403 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2047998554] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 12:12:46,403 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 12:12:46,403 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 12:12:46,403 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1470753379] [2022-12-14 12:12:46,404 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 12:12:46,404 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 12:12:46,404 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:12:46,404 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 12:12:46,404 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 12:12:46,405 INFO L87 Difference]: Start difference. First operand 390 states and 550 transitions. Second operand has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-12-14 12:12:46,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:12:46,490 INFO L93 Difference]: Finished difference Result 639 states and 874 transitions. [2022-12-14 12:12:46,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 12:12:46,491 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 46 [2022-12-14 12:12:46,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:12:46,493 INFO L225 Difference]: With dead ends: 639 [2022-12-14 12:12:46,493 INFO L226 Difference]: Without dead ends: 436 [2022-12-14 12:12:46,493 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 [2022-12-14 12:12:46,494 INFO L413 NwaCegarLoop]: 276 mSDtfsCounter, 292 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 292 SdHoareTripleChecker+Valid, 328 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 12:12:46,494 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [292 Valid, 328 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 12:12:46,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 436 states. [2022-12-14 12:12:46,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 436 to 436. [2022-12-14 12:12:46,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 436 states, 360 states have (on average 1.3916666666666666) internal successors, (501), 366 states have internal predecessors, (501), 52 states have call successors, (52), 24 states have call predecessors, (52), 22 states have return successors, (48), 46 states have call predecessors, (48), 48 states have call successors, (48) [2022-12-14 12:12:46,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 436 states to 436 states and 601 transitions. [2022-12-14 12:12:46,510 INFO L78 Accepts]: Start accepts. Automaton has 436 states and 601 transitions. Word has length 46 [2022-12-14 12:12:46,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:12:46,510 INFO L495 AbstractCegarLoop]: Abstraction has 436 states and 601 transitions. [2022-12-14 12:12:46,510 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-12-14 12:12:46,510 INFO L276 IsEmpty]: Start isEmpty. Operand 436 states and 601 transitions. [2022-12-14 12:12:46,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-12-14 12:12:46,511 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:12:46,511 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:12:46,511 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-12-14 12:12:46,512 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:12:46,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:12:46,512 INFO L85 PathProgramCache]: Analyzing trace with hash 623822379, now seen corresponding path program 1 times [2022-12-14 12:12:46,512 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:12:46,512 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [237165043] [2022-12-14 12:12:46,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:12:46,512 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:12:46,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:12:46,573 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-12-14 12:12:46,573 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:12:46,574 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [237165043] [2022-12-14 12:12:46,574 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [237165043] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 12:12:46,574 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 12:12:46,574 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-12-14 12:12:46,574 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [837286049] [2022-12-14 12:12:46,574 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 12:12:46,574 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 12:12:46,575 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:12:46,575 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 12:12:46,575 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-12-14 12:12:46,575 INFO L87 Difference]: Start difference. First operand 436 states and 601 transitions. Second operand has 4 states, 4 states have (on average 8.75) internal successors, (35), 4 states have internal predecessors, (35), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-12-14 12:12:46,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:12:46,757 INFO L93 Difference]: Finished difference Result 476 states and 648 transitions. [2022-12-14 12:12:46,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 12:12:46,757 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.75) internal successors, (35), 4 states have internal predecessors, (35), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 47 [2022-12-14 12:12:46,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:12:46,760 INFO L225 Difference]: With dead ends: 476 [2022-12-14 12:12:46,760 INFO L226 Difference]: Without dead ends: 473 [2022-12-14 12:12:46,760 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-12-14 12:12:46,761 INFO L413 NwaCegarLoop]: 285 mSDtfsCounter, 532 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 115 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 532 SdHoareTripleChecker+Valid, 326 SdHoareTripleChecker+Invalid, 182 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 115 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 12:12:46,761 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [532 Valid, 326 Invalid, 182 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [115 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 12:12:46,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 473 states. [2022-12-14 12:12:46,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 473 to 435. [2022-12-14 12:12:46,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 435 states, 360 states have (on average 1.386111111111111) internal successors, (499), 365 states have internal predecessors, (499), 51 states have call successors, (51), 24 states have call predecessors, (51), 22 states have return successors, (48), 46 states have call predecessors, (48), 48 states have call successors, (48) [2022-12-14 12:12:46,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 435 states to 435 states and 598 transitions. [2022-12-14 12:12:46,779 INFO L78 Accepts]: Start accepts. Automaton has 435 states and 598 transitions. Word has length 47 [2022-12-14 12:12:46,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:12:46,780 INFO L495 AbstractCegarLoop]: Abstraction has 435 states and 598 transitions. [2022-12-14 12:12:46,780 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.75) internal successors, (35), 4 states have internal predecessors, (35), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-12-14 12:12:46,780 INFO L276 IsEmpty]: Start isEmpty. Operand 435 states and 598 transitions. [2022-12-14 12:12:46,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-12-14 12:12:46,781 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:12:46,781 INFO L195 NwaCegarLoop]: trace histogram [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] [2022-12-14 12:12:46,781 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-12-14 12:12:46,781 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:12:46,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:12:46,781 INFO L85 PathProgramCache]: Analyzing trace with hash -2137616893, now seen corresponding path program 1 times [2022-12-14 12:12:46,781 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:12:46,781 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [955264777] [2022-12-14 12:12:46,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:12:46,782 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:12:46,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:12:46,880 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-12-14 12:12:46,880 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:12:46,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [955264777] [2022-12-14 12:12:46,881 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [955264777] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:12:46,881 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1911123440] [2022-12-14 12:12:46,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:12:46,881 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:12:46,881 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:12:46,882 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:12:46,883 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-12-14 12:12:46,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:12:46,977 INFO L263 TraceCheckSpWp]: Trace formula consists of 342 conjuncts, 9 conjunts are in the unsatisfiable core [2022-12-14 12:12:46,983 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:12:47,247 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:12:47,247 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:12:47,350 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-12-14 12:12:47,350 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1911123440] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:12:47,350 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [929235394] [2022-12-14 12:12:47,368 INFO L159 IcfgInterpreter]: Started Sifa with 40 locations of interest [2022-12-14 12:12:47,368 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:12:47,372 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:12:47,376 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:12:47,377 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:12:50,647 INFO L197 IcfgInterpreter]: Interpreting procedure error1 with input of size 165 for LOIs [2022-12-14 12:12:50,660 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread1 with input of size 180 for LOIs [2022-12-14 12:12:50,676 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify_threads with input of size 376 for LOIs [2022-12-14 12:12:52,867 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:13:14,102 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8198#(and (= ~T6_E~0 2) (= ~t6_i~0 0) (= ~t5_i~0 0) (= 0 ~t5_pc~0) (= ~E_4~0 2) (= ~t10_i~0 0) (= ~t7_i~0 0) (= ~t1_pc~0 0) (= 0 ~t8_pc~0) (= 0 ~t7_pc~0) (= ~T4_E~0 2) (= ~E_7~0 2) (= ~E_8~0 2) (= 0 ~t4_st~0) (= ~T1_E~0 2) (= ~T5_E~0 2) (= ~m_st~0 0) (= ~E_5~0 2) (= ~q_free~0 1) (<= 0 ~p_num_write~0) (= ~E_10~0 2) (= ~T2_E~0 2) (= 1 ~c_dr_i~0) (= ~T9_E~0 2) (= 0 ~t6_pc~0) (= 0 ~t5_st~0) (= ~E_3~0 2) (= 0 ~t3_pc~0) (= 0 ~t6_st~0) (= ~t9_i~0 0) (= ~t2_i~0 0) (= 0 ~t8_st~0) (= ~E_6~0 2) (= ~t4_i~0 0) (= ~t1_st~0 0) (= ~c_num_read~0 1) (= ~T7_E~0 2) (<= ~p_num_write~0 1) (= ~m_i~0 0) (= ~t10_st~0 0) (= ~t10_pc~0 0) (= 0 ~t9_pc~0) (not (= ~c_num_read~0 ~p_num_write~0)) (<= 0 (+ ~q_buf_0~0 2147483648)) (= ~p_dw_pc~0 1) (= ~q_write_ev~0 2) (= ~E_2~0 2) (= ~p_dw_st~0 0) (= ~c_last_read~0 ~q_buf_0~0) (= ~T3_E~0 2) (= ~local~0 0) (= ~t3_i~0 0) (= 0 ~t7_st~0) (= ~t8_i~0 0) (= ~token~0 0) (= ~q_read_ev~0 2) (= ~c_dr_pc~0 0) (= ~m_pc~0 0) (= 0 ~t9_st~0) (= ~T10_E~0 2) (= ~p_dw_i~0 1) (= 0 ~t2_pc~0) (= |#NULL.offset| 0) (= ~c_last_read~0 ~p_last_write~0) (<= ~p_last_write~0 2147483647) (= ~E_M~0 2) (= ~a_t~0 0) (= 0 ~t2_st~0) (= 0 ~t4_pc~0) (= ~E_1~0 2) (= 0 ~t3_st~0) (= ~T8_E~0 2) (= ~M_E~0 2) (<= 0 |#StackHeapBarrier|) (= ~E_9~0 2) (= ~t1_i~0 0) (= |#NULL.base| 0))' at error location [2022-12-14 12:13:14,102 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:13:14,102 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:13:14,102 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 4] total 7 [2022-12-14 12:13:14,102 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [317784480] [2022-12-14 12:13:14,103 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:13:14,103 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-12-14 12:13:14,103 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:13:14,104 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-12-14 12:13:14,104 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=1072, Unknown=0, NotChecked=0, Total=1190 [2022-12-14 12:13:14,104 INFO L87 Difference]: Start difference. First operand 435 states and 598 transitions. Second operand has 7 states, 7 states have (on average 10.857142857142858) internal successors, (76), 7 states have internal predecessors, (76), 6 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2022-12-14 12:13:14,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:13:14,411 INFO L93 Difference]: Finished difference Result 878 states and 1166 transitions. [2022-12-14 12:13:14,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-12-14 12:13:14,411 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 10.857142857142858) internal successors, (76), 7 states have internal predecessors, (76), 6 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) Word has length 48 [2022-12-14 12:13:14,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:13:14,414 INFO L225 Difference]: With dead ends: 878 [2022-12-14 12:13:14,414 INFO L226 Difference]: Without dead ends: 875 [2022-12-14 12:13:14,415 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 109 SyntacticMatches, 5 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 21.2s TimeCoverageRelationStatistics Valid=118, Invalid=1072, Unknown=0, NotChecked=0, Total=1190 [2022-12-14 12:13:14,415 INFO L413 NwaCegarLoop]: 339 mSDtfsCounter, 655 mSDsluCounter, 818 mSDsCounter, 0 mSdLazyCounter, 466 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 655 SdHoareTripleChecker+Valid, 1157 SdHoareTripleChecker+Invalid, 524 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 466 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 12:13:14,416 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [655 Valid, 1157 Invalid, 524 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 466 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 12:13:14,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 875 states. [2022-12-14 12:13:14,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 875 to 644. [2022-12-14 12:13:14,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 644 states, 537 states have (on average 1.3631284916201116) internal successors, (732), 544 states have internal predecessors, (732), 70 states have call successors, (70), 37 states have call predecessors, (70), 35 states have return successors, (67), 63 states have call predecessors, (67), 67 states have call successors, (67) [2022-12-14 12:13:14,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 644 states to 644 states and 869 transitions. [2022-12-14 12:13:14,446 INFO L78 Accepts]: Start accepts. Automaton has 644 states and 869 transitions. Word has length 48 [2022-12-14 12:13:14,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:13:14,447 INFO L495 AbstractCegarLoop]: Abstraction has 644 states and 869 transitions. [2022-12-14 12:13:14,447 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 10.857142857142858) internal successors, (76), 7 states have internal predecessors, (76), 6 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2022-12-14 12:13:14,447 INFO L276 IsEmpty]: Start isEmpty. Operand 644 states and 869 transitions. [2022-12-14 12:13:14,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2022-12-14 12:13:14,448 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:13:14,448 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, 1, 1, 1] [2022-12-14 12:13:14,455 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-12-14 12:13:14,649 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:13:14,649 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:13:14,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:13:14,650 INFO L85 PathProgramCache]: Analyzing trace with hash 2031223186, now seen corresponding path program 1 times [2022-12-14 12:13:14,650 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:13:14,650 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [690554408] [2022-12-14 12:13:14,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:13:14,651 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:13:14,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:13:14,778 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:13:14,778 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:13:14,778 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [690554408] [2022-12-14 12:13:14,778 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [690554408] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 12:13:14,779 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 12:13:14,779 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-12-14 12:13:14,779 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1777631829] [2022-12-14 12:13:14,779 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 12:13:14,779 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 12:13:14,779 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:13:14,780 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 12:13:14,780 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-12-14 12:13:14,780 INFO L87 Difference]: Start difference. First operand 644 states and 869 transitions. Second operand has 4 states, 4 states have (on average 12.75) internal successors, (51), 4 states have internal predecessors, (51), 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) [2022-12-14 12:13:15,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:13:15,067 INFO L93 Difference]: Finished difference Result 960 states and 1380 transitions. [2022-12-14 12:13:15,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 12:13:15,067 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.75) internal successors, (51), 4 states have internal predecessors, (51), 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 62 [2022-12-14 12:13:15,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:13:15,071 INFO L225 Difference]: With dead ends: 960 [2022-12-14 12:13:15,071 INFO L226 Difference]: Without dead ends: 796 [2022-12-14 12:13:15,072 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 [2022-12-14 12:13:15,073 INFO L413 NwaCegarLoop]: 456 mSDtfsCounter, 510 mSDsluCounter, 355 mSDsCounter, 0 mSdLazyCounter, 289 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 510 SdHoareTripleChecker+Valid, 811 SdHoareTripleChecker+Invalid, 296 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 289 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 12:13:15,073 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [510 Valid, 811 Invalid, 296 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 289 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 12:13:15,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 796 states. [2022-12-14 12:13:15,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 796 to 795. [2022-12-14 12:13:15,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 795 states, 662 states have (on average 1.3867069486404835) internal successors, (918), 670 states have internal predecessors, (918), 90 states have call successors, (90), 43 states have call predecessors, (90), 41 states have return successors, (87), 82 states have call predecessors, (87), 87 states have call successors, (87) [2022-12-14 12:13:15,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 795 states to 795 states and 1095 transitions. [2022-12-14 12:13:15,134 INFO L78 Accepts]: Start accepts. Automaton has 795 states and 1095 transitions. Word has length 62 [2022-12-14 12:13:15,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:13:15,134 INFO L495 AbstractCegarLoop]: Abstraction has 795 states and 1095 transitions. [2022-12-14 12:13:15,134 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.75) internal successors, (51), 4 states have internal predecessors, (51), 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) [2022-12-14 12:13:15,135 INFO L276 IsEmpty]: Start isEmpty. Operand 795 states and 1095 transitions. [2022-12-14 12:13:15,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-12-14 12:13:15,136 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:13:15,136 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 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] [2022-12-14 12:13:15,136 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-12-14 12:13:15,136 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:13:15,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:13:15,136 INFO L85 PathProgramCache]: Analyzing trace with hash 219959389, now seen corresponding path program 2 times [2022-12-14 12:13:15,136 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:13:15,137 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1788403063] [2022-12-14 12:13:15,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:13:15,137 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:13:15,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:13:15,162 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-12-14 12:13:15,162 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:13:15,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1788403063] [2022-12-14 12:13:15,163 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1788403063] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 12:13:15,163 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 12:13:15,163 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 12:13:15,163 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [506133120] [2022-12-14 12:13:15,163 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 12:13:15,163 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 12:13:15,163 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:13:15,164 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 12:13:15,164 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 12:13:15,164 INFO L87 Difference]: Start difference. First operand 795 states and 1095 transitions. Second operand has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2022-12-14 12:13:15,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:13:15,270 INFO L93 Difference]: Finished difference Result 1125 states and 1528 transitions. [2022-12-14 12:13:15,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 12:13:15,271 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 61 [2022-12-14 12:13:15,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:13:15,273 INFO L225 Difference]: With dead ends: 1125 [2022-12-14 12:13:15,273 INFO L226 Difference]: Without dead ends: 737 [2022-12-14 12:13:15,274 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 [2022-12-14 12:13:15,275 INFO L413 NwaCegarLoop]: 295 mSDtfsCounter, 304 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 304 SdHoareTripleChecker+Valid, 340 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 12:13:15,275 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [304 Valid, 340 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 12:13:15,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 737 states. [2022-12-14 12:13:15,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 737 to 728. [2022-12-14 12:13:15,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 728 states, 605 states have (on average 1.3834710743801653) internal successors, (837), 614 states have internal predecessors, (837), 84 states have call successors, (84), 39 states have call predecessors, (84), 37 states have return successors, (81), 75 states have call predecessors, (81), 81 states have call successors, (81) [2022-12-14 12:13:15,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 728 states to 728 states and 1002 transitions. [2022-12-14 12:13:15,310 INFO L78 Accepts]: Start accepts. Automaton has 728 states and 1002 transitions. Word has length 61 [2022-12-14 12:13:15,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:13:15,310 INFO L495 AbstractCegarLoop]: Abstraction has 728 states and 1002 transitions. [2022-12-14 12:13:15,310 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2022-12-14 12:13:15,310 INFO L276 IsEmpty]: Start isEmpty. Operand 728 states and 1002 transitions. [2022-12-14 12:13:15,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-12-14 12:13:15,312 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:13:15,312 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 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] [2022-12-14 12:13:15,312 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-12-14 12:13:15,312 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:13:15,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:13:15,312 INFO L85 PathProgramCache]: Analyzing trace with hash -1992881019, now seen corresponding path program 1 times [2022-12-14 12:13:15,312 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:13:15,313 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2142957652] [2022-12-14 12:13:15,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:13:15,313 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:13:15,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:13:15,407 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 16 proven. 14 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 12:13:15,407 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:13:15,407 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2142957652] [2022-12-14 12:13:15,407 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2142957652] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:13:15,408 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [600198146] [2022-12-14 12:13:15,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:13:15,408 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:13:15,408 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:13:15,409 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:13:15,410 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-12-14 12:13:15,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:13:15,488 INFO L263 TraceCheckSpWp]: Trace formula consists of 425 conjuncts, 2 conjunts are in the unsatisfiable core [2022-12-14 12:13:15,490 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:13:15,502 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 32 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-12-14 12:13:15,503 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 12:13:15,503 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [600198146] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 12:13:15,503 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-12-14 12:13:15,503 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2022-12-14 12:13:15,503 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [999583932] [2022-12-14 12:13:15,503 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 12:13:15,504 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 12:13:15,504 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:13:15,504 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 12:13:15,504 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-12-14 12:13:15,504 INFO L87 Difference]: Start difference. First operand 728 states and 1002 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2022-12-14 12:13:15,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:13:15,593 INFO L93 Difference]: Finished difference Result 855 states and 1161 transitions. [2022-12-14 12:13:15,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 12:13:15,594 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 73 [2022-12-14 12:13:15,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:13:15,595 INFO L225 Difference]: With dead ends: 855 [2022-12-14 12:13:15,595 INFO L226 Difference]: Without dead ends: 321 [2022-12-14 12:13:15,596 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-12-14 12:13:15,597 INFO L413 NwaCegarLoop]: 287 mSDtfsCounter, 25 mSDsluCounter, 259 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 546 SdHoareTripleChecker+Invalid, 108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 12:13:15,597 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 546 Invalid, 108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 108 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 12:13:15,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 321 states. [2022-12-14 12:13:15,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 321 to 321. [2022-12-14 12:13:15,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 321 states, 262 states have (on average 1.5076335877862594) internal successors, (395), 265 states have internal predecessors, (395), 46 states have call successors, (46), 13 states have call predecessors, (46), 12 states have return successors, (44), 43 states have call predecessors, (44), 44 states have call successors, (44) [2022-12-14 12:13:15,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 321 states to 321 states and 485 transitions. [2022-12-14 12:13:15,621 INFO L78 Accepts]: Start accepts. Automaton has 321 states and 485 transitions. Word has length 73 [2022-12-14 12:13:15,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:13:15,621 INFO L495 AbstractCegarLoop]: Abstraction has 321 states and 485 transitions. [2022-12-14 12:13:15,621 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2022-12-14 12:13:15,621 INFO L276 IsEmpty]: Start isEmpty. Operand 321 states and 485 transitions. [2022-12-14 12:13:15,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2022-12-14 12:13:15,623 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:13:15,623 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, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:13:15,629 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-12-14 12:13:15,823 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:13:15,824 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:13:15,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:13:15,824 INFO L85 PathProgramCache]: Analyzing trace with hash 741579701, now seen corresponding path program 1 times [2022-12-14 12:13:15,824 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:13:15,824 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1745201501] [2022-12-14 12:13:15,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:13:15,824 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:13:15,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:13:15,926 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-12-14 12:13:15,926 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:13:15,926 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1745201501] [2022-12-14 12:13:15,926 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1745201501] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:13:15,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [188168745] [2022-12-14 12:13:15,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:13:15,927 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:13:15,927 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:13:15,928 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:13:15,929 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-12-14 12:13:16,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:13:16,085 INFO L263 TraceCheckSpWp]: Trace formula consists of 915 conjuncts, 2 conjunts are in the unsatisfiable core [2022-12-14 12:13:16,089 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:13:16,123 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-12-14 12:13:16,124 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 12:13:16,124 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [188168745] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 12:13:16,124 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-12-14 12:13:16,124 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-12-14 12:13:16,124 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [457535479] [2022-12-14 12:13:16,124 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 12:13:16,125 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 12:13:16,125 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:13:16,125 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 12:13:16,125 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-12-14 12:13:16,125 INFO L87 Difference]: Start difference. First operand 321 states and 485 transitions. Second operand has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 2 states have internal predecessors, (95), 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) [2022-12-14 12:13:16,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:13:16,242 INFO L93 Difference]: Finished difference Result 944 states and 1452 transitions. [2022-12-14 12:13:16,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 12:13:16,242 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 2 states have internal predecessors, (95), 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 123 [2022-12-14 12:13:16,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:13:16,245 INFO L225 Difference]: With dead ends: 944 [2022-12-14 12:13:16,245 INFO L226 Difference]: Without dead ends: 629 [2022-12-14 12:13:16,246 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-12-14 12:13:16,246 INFO L413 NwaCegarLoop]: 268 mSDtfsCounter, 212 mSDsluCounter, 202 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 212 SdHoareTripleChecker+Valid, 470 SdHoareTripleChecker+Invalid, 97 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 95 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 12:13:16,246 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [212 Valid, 470 Invalid, 97 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 95 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 12:13:16,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 629 states. [2022-12-14 12:13:16,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 629 to 623. [2022-12-14 12:13:16,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 623 states, 514 states have (on average 1.5058365758754864) internal successors, (774), 518 states have internal predecessors, (774), 84 states have call successors, (84), 25 states have call predecessors, (84), 24 states have return successors, (82), 80 states have call predecessors, (82), 82 states have call successors, (82) [2022-12-14 12:13:16,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 623 states to 623 states and 940 transitions. [2022-12-14 12:13:16,276 INFO L78 Accepts]: Start accepts. Automaton has 623 states and 940 transitions. Word has length 123 [2022-12-14 12:13:16,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:13:16,276 INFO L495 AbstractCegarLoop]: Abstraction has 623 states and 940 transitions. [2022-12-14 12:13:16,276 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 2 states have internal predecessors, (95), 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) [2022-12-14 12:13:16,276 INFO L276 IsEmpty]: Start isEmpty. Operand 623 states and 940 transitions. [2022-12-14 12:13:16,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2022-12-14 12:13:16,277 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:13:16,278 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, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:13:16,284 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-12-14 12:13:16,478 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-12-14 12:13:16,478 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:13:16,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:13:16,478 INFO L85 PathProgramCache]: Analyzing trace with hash -2104257195, now seen corresponding path program 1 times [2022-12-14 12:13:16,478 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:13:16,479 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [639962749] [2022-12-14 12:13:16,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:13:16,479 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:13:16,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:13:16,575 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-12-14 12:13:16,576 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:13:16,576 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [639962749] [2022-12-14 12:13:16,576 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [639962749] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:13:16,576 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1981142594] [2022-12-14 12:13:16,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:13:16,576 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:13:16,576 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:13:16,577 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:13:16,578 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-12-14 12:13:16,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:13:16,743 INFO L263 TraceCheckSpWp]: Trace formula consists of 909 conjuncts, 2 conjunts are in the unsatisfiable core [2022-12-14 12:13:16,746 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:13:16,780 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2022-12-14 12:13:16,780 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 12:13:16,780 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1981142594] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 12:13:16,780 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-12-14 12:13:16,781 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-12-14 12:13:16,781 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [237906945] [2022-12-14 12:13:16,781 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 12:13:16,781 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 12:13:16,781 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:13:16,782 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 12:13:16,782 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-12-14 12:13:16,782 INFO L87 Difference]: Start difference. First operand 623 states and 940 transitions. Second operand has 3 states, 3 states have (on average 27.666666666666668) internal successors, (83), 2 states have internal predecessors, (83), 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) [2022-12-14 12:13:16,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:13:16,954 INFO L93 Difference]: Finished difference Result 1844 states and 2831 transitions. [2022-12-14 12:13:16,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 12:13:16,955 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.666666666666668) internal successors, (83), 2 states have internal predecessors, (83), 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 123 [2022-12-14 12:13:16,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:13:16,959 INFO L225 Difference]: With dead ends: 1844 [2022-12-14 12:13:16,959 INFO L226 Difference]: Without dead ends: 1227 [2022-12-14 12:13:16,960 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-12-14 12:13:16,961 INFO L413 NwaCegarLoop]: 267 mSDtfsCounter, 224 mSDsluCounter, 202 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 224 SdHoareTripleChecker+Valid, 469 SdHoareTripleChecker+Invalid, 97 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 95 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 12:13:16,961 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [224 Valid, 469 Invalid, 97 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 95 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 12:13:16,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1227 states. [2022-12-14 12:13:17,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1227 to 1219. [2022-12-14 12:13:17,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1219 states, 1012 states have (on average 1.5019762845849802) internal successors, (1520), 1018 states have internal predecessors, (1520), 158 states have call successors, (158), 49 states have call predecessors, (158), 48 states have return successors, (156), 152 states have call predecessors, (156), 156 states have call successors, (156) [2022-12-14 12:13:17,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1219 states to 1219 states and 1834 transitions. [2022-12-14 12:13:17,020 INFO L78 Accepts]: Start accepts. Automaton has 1219 states and 1834 transitions. Word has length 123 [2022-12-14 12:13:17,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:13:17,020 INFO L495 AbstractCegarLoop]: Abstraction has 1219 states and 1834 transitions. [2022-12-14 12:13:17,020 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.666666666666668) internal successors, (83), 2 states have internal predecessors, (83), 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) [2022-12-14 12:13:17,020 INFO L276 IsEmpty]: Start isEmpty. Operand 1219 states and 1834 transitions. [2022-12-14 12:13:17,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2022-12-14 12:13:17,022 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:13:17,022 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, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:13:17,027 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-12-14 12:13:17,222 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-12-14 12:13:17,223 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:13:17,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:13:17,223 INFO L85 PathProgramCache]: Analyzing trace with hash -978706699, now seen corresponding path program 1 times [2022-12-14 12:13:17,223 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:13:17,223 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1145965765] [2022-12-14 12:13:17,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:13:17,223 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:13:17,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:13:17,324 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-12-14 12:13:17,324 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:13:17,324 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1145965765] [2022-12-14 12:13:17,324 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1145965765] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:13:17,324 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1190307465] [2022-12-14 12:13:17,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:13:17,324 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:13:17,325 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:13:17,325 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:13:17,326 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-12-14 12:13:17,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:13:17,476 INFO L263 TraceCheckSpWp]: Trace formula consists of 903 conjuncts, 2 conjunts are in the unsatisfiable core [2022-12-14 12:13:17,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:13:17,499 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-12-14 12:13:17,499 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 12:13:17,499 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1190307465] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 12:13:17,499 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-12-14 12:13:17,499 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-12-14 12:13:17,500 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2125946700] [2022-12-14 12:13:17,500 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 12:13:17,500 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 12:13:17,500 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:13:17,500 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 12:13:17,500 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-12-14 12:13:17,500 INFO L87 Difference]: Start difference. First operand 1219 states and 1834 transitions. Second operand has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 2 states have internal predecessors, (74), 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) [2022-12-14 12:13:17,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:13:17,729 INFO L93 Difference]: Finished difference Result 3620 states and 5539 transitions. [2022-12-14 12:13:17,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 12:13:17,730 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 2 states have internal predecessors, (74), 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 123 [2022-12-14 12:13:17,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:13:17,737 INFO L225 Difference]: With dead ends: 3620 [2022-12-14 12:13:17,737 INFO L226 Difference]: Without dead ends: 2407 [2022-12-14 12:13:17,741 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-12-14 12:13:17,742 INFO L413 NwaCegarLoop]: 266 mSDtfsCounter, 233 mSDsluCounter, 202 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 233 SdHoareTripleChecker+Valid, 468 SdHoareTripleChecker+Invalid, 97 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 95 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 12:13:17,742 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [233 Valid, 468 Invalid, 97 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 95 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 12:13:17,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2407 states. [2022-12-14 12:13:17,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2407 to 2395. [2022-12-14 12:13:17,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2395 states, 1996 states have (on average 1.496993987975952) internal successors, (2988), 2006 states have internal predecessors, (2988), 302 states have call successors, (302), 97 states have call predecessors, (302), 96 states have return successors, (300), 292 states have call predecessors, (300), 300 states have call successors, (300) [2022-12-14 12:13:17,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2395 states to 2395 states and 3590 transitions. [2022-12-14 12:13:17,888 INFO L78 Accepts]: Start accepts. Automaton has 2395 states and 3590 transitions. Word has length 123 [2022-12-14 12:13:17,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:13:17,888 INFO L495 AbstractCegarLoop]: Abstraction has 2395 states and 3590 transitions. [2022-12-14 12:13:17,888 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 2 states have internal predecessors, (74), 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) [2022-12-14 12:13:17,889 INFO L276 IsEmpty]: Start isEmpty. Operand 2395 states and 3590 transitions. [2022-12-14 12:13:17,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2022-12-14 12:13:17,892 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:13:17,892 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, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:13:17,897 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-12-14 12:13:18,092 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-12-14 12:13:18,092 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:13:18,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:13:18,093 INFO L85 PathProgramCache]: Analyzing trace with hash -1765512875, now seen corresponding path program 1 times [2022-12-14 12:13:18,093 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:13:18,093 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1382427925] [2022-12-14 12:13:18,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:13:18,093 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:13:18,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:13:18,182 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-12-14 12:13:18,183 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:13:18,183 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1382427925] [2022-12-14 12:13:18,183 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1382427925] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:13:18,183 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1321964389] [2022-12-14 12:13:18,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:13:18,183 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:13:18,183 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:13:18,184 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:13:18,185 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-12-14 12:13:18,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:13:18,348 INFO L263 TraceCheckSpWp]: Trace formula consists of 897 conjuncts, 2 conjunts are in the unsatisfiable core [2022-12-14 12:13:18,351 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:13:18,377 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-12-14 12:13:18,378 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 12:13:18,378 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1321964389] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 12:13:18,378 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-12-14 12:13:18,378 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-12-14 12:13:18,378 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1136928211] [2022-12-14 12:13:18,378 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 12:13:18,378 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 12:13:18,379 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:13:18,379 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 12:13:18,379 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-12-14 12:13:18,379 INFO L87 Difference]: Start difference. First operand 2395 states and 3590 transitions. Second operand has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 2 states have internal predecessors, (89), 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) [2022-12-14 12:13:18,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:13:18,687 INFO L93 Difference]: Finished difference Result 7124 states and 10855 transitions. [2022-12-14 12:13:18,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 12:13:18,687 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 2 states have internal predecessors, (89), 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 123 [2022-12-14 12:13:18,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:13:18,699 INFO L225 Difference]: With dead ends: 7124 [2022-12-14 12:13:18,699 INFO L226 Difference]: Without dead ends: 4735 [2022-12-14 12:13:18,704 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-12-14 12:13:18,705 INFO L413 NwaCegarLoop]: 230 mSDtfsCounter, 218 mSDsluCounter, 202 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 218 SdHoareTripleChecker+Valid, 432 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 12:13:18,705 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [218 Valid, 432 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 12:13:18,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4735 states. [2022-12-14 12:13:18,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4735 to 4715. [2022-12-14 12:13:18,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4715 states, 3940 states have (on average 1.4913705583756345) internal successors, (5876), 3958 states have internal predecessors, (5876), 582 states have call successors, (582), 193 states have call predecessors, (582), 192 states have return successors, (580), 564 states have call predecessors, (580), 580 states have call successors, (580) [2022-12-14 12:13:18,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4715 states to 4715 states and 7038 transitions. [2022-12-14 12:13:18,926 INFO L78 Accepts]: Start accepts. Automaton has 4715 states and 7038 transitions. Word has length 123 [2022-12-14 12:13:18,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:13:18,927 INFO L495 AbstractCegarLoop]: Abstraction has 4715 states and 7038 transitions. [2022-12-14 12:13:18,927 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 2 states have internal predecessors, (89), 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) [2022-12-14 12:13:18,927 INFO L276 IsEmpty]: Start isEmpty. Operand 4715 states and 7038 transitions. [2022-12-14 12:13:18,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2022-12-14 12:13:18,932 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:13:18,932 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, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:13:18,937 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-12-14 12:13:19,133 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-12-14 12:13:19,133 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:13:19,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:13:19,134 INFO L85 PathProgramCache]: Analyzing trace with hash 1768598261, now seen corresponding path program 1 times [2022-12-14 12:13:19,134 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:13:19,134 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1374721694] [2022-12-14 12:13:19,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:13:19,134 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:13:19,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:13:19,227 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-12-14 12:13:19,227 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:13:19,227 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1374721694] [2022-12-14 12:13:19,227 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1374721694] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:13:19,227 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2139779778] [2022-12-14 12:13:19,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:13:19,228 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:13:19,228 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:13:19,228 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:13:19,229 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-12-14 12:13:19,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:13:19,373 INFO L263 TraceCheckSpWp]: Trace formula consists of 891 conjuncts, 2 conjunts are in the unsatisfiable core [2022-12-14 12:13:19,376 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:13:19,396 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-12-14 12:13:19,396 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 12:13:19,397 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2139779778] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 12:13:19,397 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-12-14 12:13:19,397 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-12-14 12:13:19,397 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2030704365] [2022-12-14 12:13:19,397 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 12:13:19,398 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 12:13:19,398 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:13:19,398 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 12:13:19,398 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-12-14 12:13:19,398 INFO L87 Difference]: Start difference. First operand 4715 states and 7038 transitions. Second operand has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 2 states have internal predecessors, (80), 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) [2022-12-14 12:13:19,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:13:19,919 INFO L93 Difference]: Finished difference Result 14036 states and 21287 transitions. [2022-12-14 12:13:19,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 12:13:19,920 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 2 states have internal predecessors, (80), 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 123 [2022-12-14 12:13:19,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:13:19,944 INFO L225 Difference]: With dead ends: 14036 [2022-12-14 12:13:19,944 INFO L226 Difference]: Without dead ends: 9327 [2022-12-14 12:13:19,953 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-12-14 12:13:19,954 INFO L413 NwaCegarLoop]: 230 mSDtfsCounter, 227 mSDsluCounter, 202 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 227 SdHoareTripleChecker+Valid, 432 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 12:13:19,954 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [227 Valid, 432 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 12:13:19,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9327 states. [2022-12-14 12:13:20,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9327 to 9291. [2022-12-14 12:13:20,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9291 states, 7780 states have (on average 1.4853470437017995) internal successors, (11556), 7814 states have internal predecessors, (11556), 1126 states have call successors, (1126), 385 states have call predecessors, (1126), 384 states have return successors, (1124), 1092 states have call predecessors, (1124), 1124 states have call successors, (1124) [2022-12-14 12:13:20,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9291 states to 9291 states and 13806 transitions. [2022-12-14 12:13:20,473 INFO L78 Accepts]: Start accepts. Automaton has 9291 states and 13806 transitions. Word has length 123 [2022-12-14 12:13:20,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:13:20,474 INFO L495 AbstractCegarLoop]: Abstraction has 9291 states and 13806 transitions. [2022-12-14 12:13:20,474 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 2 states have internal predecessors, (80), 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) [2022-12-14 12:13:20,474 INFO L276 IsEmpty]: Start isEmpty. Operand 9291 states and 13806 transitions. [2022-12-14 12:13:20,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2022-12-14 12:13:20,484 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:13:20,484 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, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:13:20,490 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-12-14 12:13:20,685 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-12-14 12:13:20,685 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:13:20,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:13:20,686 INFO L85 PathProgramCache]: Analyzing trace with hash -2061222571, now seen corresponding path program 1 times [2022-12-14 12:13:20,686 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:13:20,686 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [974981165] [2022-12-14 12:13:20,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:13:20,686 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:13:20,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:13:21,014 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2022-12-14 12:13:21,015 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:13:21,015 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [974981165] [2022-12-14 12:13:21,015 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [974981165] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 12:13:21,015 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 12:13:21,015 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-12-14 12:13:21,015 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [237140054] [2022-12-14 12:13:21,016 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 12:13:21,016 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-12-14 12:13:21,016 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:13:21,017 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-12-14 12:13:21,017 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-12-14 12:13:21,017 INFO L87 Difference]: Start difference. First operand 9291 states and 13806 transitions. Second operand has 6 states, 6 states have (on average 11.833333333333334) internal successors, (71), 6 states have internal predecessors, (71), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2022-12-14 12:13:22,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:13:22,551 INFO L93 Difference]: Finished difference Result 29779 states and 44565 transitions. [2022-12-14 12:13:22,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-12-14 12:13:22,552 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 11.833333333333334) internal successors, (71), 6 states have internal predecessors, (71), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 123 [2022-12-14 12:13:22,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:13:22,623 INFO L225 Difference]: With dead ends: 29779 [2022-12-14 12:13:22,623 INFO L226 Difference]: Without dead ends: 20495 [2022-12-14 12:13:22,641 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2022-12-14 12:13:22,642 INFO L413 NwaCegarLoop]: 237 mSDtfsCounter, 772 mSDsluCounter, 500 mSDsCounter, 0 mSdLazyCounter, 355 mSolverCounterSat, 133 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 791 SdHoareTripleChecker+Valid, 737 SdHoareTripleChecker+Invalid, 488 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 133 IncrementalHoareTripleChecker+Valid, 355 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 12:13:22,642 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [791 Valid, 737 Invalid, 488 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [133 Valid, 355 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 12:13:22,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20495 states. [2022-12-14 12:13:23,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20495 to 18187. [2022-12-14 12:13:23,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18187 states, 15236 states have (on average 1.4788658440535574) internal successors, (22532), 15302 states have internal predecessors, (22532), 2182 states have call successors, (2182), 769 states have call predecessors, (2182), 768 states have return successors, (2180), 2116 states have call predecessors, (2180), 2180 states have call successors, (2180) [2022-12-14 12:13:23,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18187 states to 18187 states and 26894 transitions. [2022-12-14 12:13:23,699 INFO L78 Accepts]: Start accepts. Automaton has 18187 states and 26894 transitions. Word has length 123 [2022-12-14 12:13:23,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:13:23,699 INFO L495 AbstractCegarLoop]: Abstraction has 18187 states and 26894 transitions. [2022-12-14 12:13:23,699 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 11.833333333333334) internal successors, (71), 6 states have internal predecessors, (71), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2022-12-14 12:13:23,700 INFO L276 IsEmpty]: Start isEmpty. Operand 18187 states and 26894 transitions. [2022-12-14 12:13:23,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2022-12-14 12:13:23,723 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:13:23,723 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, 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] [2022-12-14 12:13:23,723 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2022-12-14 12:13:23,723 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:13:23,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:13:23,723 INFO L85 PathProgramCache]: Analyzing trace with hash 707152003, now seen corresponding path program 1 times [2022-12-14 12:13:23,723 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:13:23,723 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [107471943] [2022-12-14 12:13:23,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:13:23,724 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:13:23,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:13:24,027 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2022-12-14 12:13:24,027 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:13:24,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [107471943] [2022-12-14 12:13:24,027 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [107471943] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 12:13:24,027 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 12:13:24,027 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-12-14 12:13:24,027 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [169041453] [2022-12-14 12:13:24,028 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 12:13:24,028 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-12-14 12:13:24,028 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:13:24,029 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-12-14 12:13:24,029 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-12-14 12:13:24,029 INFO L87 Difference]: Start difference. First operand 18187 states and 26894 transitions. Second operand has 6 states, 6 states have (on average 12.0) internal successors, (72), 6 states have internal predecessors, (72), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2022-12-14 12:13:26,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:13:26,799 INFO L93 Difference]: Finished difference Result 63123 states and 93461 transitions. [2022-12-14 12:13:26,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-12-14 12:13:26,799 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.0) internal successors, (72), 6 states have internal predecessors, (72), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 124 [2022-12-14 12:13:26,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:13:26,897 INFO L225 Difference]: With dead ends: 63123 [2022-12-14 12:13:26,897 INFO L226 Difference]: Without dead ends: 44943 [2022-12-14 12:13:26,926 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2022-12-14 12:13:26,926 INFO L413 NwaCegarLoop]: 238 mSDtfsCounter, 914 mSDsluCounter, 529 mSDsCounter, 0 mSdLazyCounter, 360 mSolverCounterSat, 133 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 933 SdHoareTripleChecker+Valid, 767 SdHoareTripleChecker+Invalid, 493 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 133 IncrementalHoareTripleChecker+Valid, 360 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 12:13:26,927 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [933 Valid, 767 Invalid, 493 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [133 Valid, 360 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 12:13:26,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44943 states. [2022-12-14 12:13:29,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44943 to 35595. [2022-12-14 12:13:29,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35595 states, 29828 states have (on average 1.4720396942470162) internal successors, (43908), 29958 states have internal predecessors, (43908), 4230 states have call successors, (4230), 1537 states have call predecessors, (4230), 1536 states have return successors, (4228), 4100 states have call predecessors, (4228), 4228 states have call successors, (4228) [2022-12-14 12:13:29,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35595 states to 35595 states and 52366 transitions. [2022-12-14 12:13:29,405 INFO L78 Accepts]: Start accepts. Automaton has 35595 states and 52366 transitions. Word has length 124 [2022-12-14 12:13:29,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:13:29,405 INFO L495 AbstractCegarLoop]: Abstraction has 35595 states and 52366 transitions. [2022-12-14 12:13:29,405 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.0) internal successors, (72), 6 states have internal predecessors, (72), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2022-12-14 12:13:29,405 INFO L276 IsEmpty]: Start isEmpty. Operand 35595 states and 52366 transitions. [2022-12-14 12:13:29,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2022-12-14 12:13:29,438 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:13:29,439 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2022-12-14 12:13:29,439 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2022-12-14 12:13:29,439 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:13:29,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:13:29,439 INFO L85 PathProgramCache]: Analyzing trace with hash 1350032557, now seen corresponding path program 1 times [2022-12-14 12:13:29,439 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:13:29,439 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1996236337] [2022-12-14 12:13:29,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:13:29,439 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:13:29,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:13:29,601 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 10 proven. 35 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-12-14 12:13:29,601 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:13:29,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1996236337] [2022-12-14 12:13:29,601 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1996236337] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:13:29,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2035355242] [2022-12-14 12:13:29,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:13:29,602 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:13:29,602 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:13:29,603 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:13:29,603 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-12-14 12:13:29,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:13:29,774 INFO L263 TraceCheckSpWp]: Trace formula consists of 938 conjuncts, 2 conjunts are in the unsatisfiable core [2022-12-14 12:13:29,776 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:13:29,797 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 27 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-12-14 12:13:29,798 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 12:13:29,798 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2035355242] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 12:13:29,798 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-12-14 12:13:29,798 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2022-12-14 12:13:29,798 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1782296381] [2022-12-14 12:13:29,798 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 12:13:29,799 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 12:13:29,799 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:13:29,799 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 12:13:29,799 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-12-14 12:13:29,800 INFO L87 Difference]: Start difference. First operand 35595 states and 52366 transitions. Second operand has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 3 states have internal predecessors, (88), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-12-14 12:13:32,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:13:32,419 INFO L93 Difference]: Finished difference Result 63119 states and 94353 transitions. [2022-12-14 12:13:32,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 12:13:32,420 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 3 states have internal predecessors, (88), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 145 [2022-12-14 12:13:32,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:13:32,538 INFO L225 Difference]: With dead ends: 63119 [2022-12-14 12:13:32,539 INFO L226 Difference]: Without dead ends: 44811 [2022-12-14 12:13:32,573 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-12-14 12:13:32,574 INFO L413 NwaCegarLoop]: 324 mSDtfsCounter, 106 mSDsluCounter, 222 mSDsCounter, 0 mSdLazyCounter, 114 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 106 SdHoareTripleChecker+Valid, 546 SdHoareTripleChecker+Invalid, 114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 114 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 12:13:32,574 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [106 Valid, 546 Invalid, 114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 114 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 12:13:32,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44811 states. [2022-12-14 12:13:35,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44811 to 42059. [2022-12-14 12:13:35,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42059 states, 36036 states have (on average 1.5132645132645133) internal successors, (54532), 36166 states have internal predecessors, (54532), 4358 states have call successors, (4358), 1665 states have call predecessors, (4358), 1664 states have return successors, (4356), 4228 states have call predecessors, (4356), 4356 states have call successors, (4356) [2022-12-14 12:13:35,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42059 states to 42059 states and 63246 transitions. [2022-12-14 12:13:35,490 INFO L78 Accepts]: Start accepts. Automaton has 42059 states and 63246 transitions. Word has length 145 [2022-12-14 12:13:35,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:13:35,491 INFO L495 AbstractCegarLoop]: Abstraction has 42059 states and 63246 transitions. [2022-12-14 12:13:35,491 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 3 states have internal predecessors, (88), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-12-14 12:13:35,491 INFO L276 IsEmpty]: Start isEmpty. Operand 42059 states and 63246 transitions. [2022-12-14 12:13:35,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2022-12-14 12:13:35,550 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:13:35,550 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, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:13:35,555 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-12-14 12:13:35,750 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-12-14 12:13:35,750 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:13:35,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:13:35,751 INFO L85 PathProgramCache]: Analyzing trace with hash 259942080, now seen corresponding path program 1 times [2022-12-14 12:13:35,751 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:13:35,751 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [640975387] [2022-12-14 12:13:35,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:13:35,751 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:13:35,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:13:35,951 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 10 proven. 69 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2022-12-14 12:13:35,951 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:13:35,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [640975387] [2022-12-14 12:13:35,951 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [640975387] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:13:35,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [270550020] [2022-12-14 12:13:35,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:13:35,951 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:13:35,951 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:13:35,952 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:13:35,953 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-12-14 12:13:36,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:13:36,131 INFO L263 TraceCheckSpWp]: Trace formula consists of 1166 conjuncts, 2 conjunts are in the unsatisfiable core [2022-12-14 12:13:36,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:13:36,255 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 87 proven. 0 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2022-12-14 12:13:36,255 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 12:13:36,255 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [270550020] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 12:13:36,255 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-12-14 12:13:36,255 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [6] total 7 [2022-12-14 12:13:36,256 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1955058417] [2022-12-14 12:13:36,256 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 12:13:36,256 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 12:13:36,256 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:13:36,257 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 12:13:36,257 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-12-14 12:13:36,257 INFO L87 Difference]: Start difference. First operand 42059 states and 63246 transitions. Second operand has 3 states, 3 states have (on average 39.666666666666664) internal successors, (119), 2 states have internal predecessors, (119), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2022-12-14 12:13:41,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:13:41,038 INFO L93 Difference]: Finished difference Result 125396 states and 190871 transitions. [2022-12-14 12:13:41,039 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 12:13:41,039 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 39.666666666666664) internal successors, (119), 2 states have internal predecessors, (119), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 189 [2022-12-14 12:13:41,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:13:41,272 INFO L225 Difference]: With dead ends: 125396 [2022-12-14 12:13:41,273 INFO L226 Difference]: Without dead ends: 83343 [2022-12-14 12:13:41,335 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 191 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-12-14 12:13:41,335 INFO L413 NwaCegarLoop]: 238 mSDtfsCounter, 165 mSDsluCounter, 202 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 165 SdHoareTripleChecker+Valid, 440 SdHoareTripleChecker+Invalid, 96 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 12:13:41,335 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [165 Valid, 440 Invalid, 96 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 12:13:41,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83343 states. [2022-12-14 12:13:45,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83343 to 82955. [2022-12-14 12:13:45,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82955 states, 71172 states have (on average 1.5071657393356939) internal successors, (107268), 71430 states have internal predecessors, (107268), 8454 states have call successors, (8454), 3329 states have call predecessors, (8454), 3328 states have return successors, (8452), 8196 states have call predecessors, (8452), 8452 states have call successors, (8452) [2022-12-14 12:13:45,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82955 states to 82955 states and 124174 transitions. [2022-12-14 12:13:46,003 INFO L78 Accepts]: Start accepts. Automaton has 82955 states and 124174 transitions. Word has length 189 [2022-12-14 12:13:46,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:13:46,003 INFO L495 AbstractCegarLoop]: Abstraction has 82955 states and 124174 transitions. [2022-12-14 12:13:46,003 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 39.666666666666664) internal successors, (119), 2 states have internal predecessors, (119), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2022-12-14 12:13:46,003 INFO L276 IsEmpty]: Start isEmpty. Operand 82955 states and 124174 transitions. [2022-12-14 12:13:46,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2022-12-14 12:13:46,121 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:13:46,121 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, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:13:46,126 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2022-12-14 12:13:46,322 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:13:46,322 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:13:46,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:13:46,322 INFO L85 PathProgramCache]: Analyzing trace with hash 366333382, now seen corresponding path program 1 times [2022-12-14 12:13:46,322 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:13:46,322 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1280484617] [2022-12-14 12:13:46,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:13:46,322 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:13:46,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:13:46,532 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 10 proven. 69 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2022-12-14 12:13:46,533 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:13:46,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1280484617] [2022-12-14 12:13:46,533 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1280484617] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:13:46,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1687258542] [2022-12-14 12:13:46,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:13:46,533 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:13:46,533 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:13:46,534 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:13:46,535 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-12-14 12:13:46,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:13:46,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 1166 conjuncts, 2 conjunts are in the unsatisfiable core [2022-12-14 12:13:46,724 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:13:46,816 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 89 proven. 0 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2022-12-14 12:13:46,816 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 12:13:46,816 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1687258542] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 12:13:46,816 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-12-14 12:13:46,816 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [6] total 7 [2022-12-14 12:13:46,816 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [235792949] [2022-12-14 12:13:46,816 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 12:13:46,817 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 12:13:46,817 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:13:46,817 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 12:13:46,818 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-12-14 12:13:46,818 INFO L87 Difference]: Start difference. First operand 82955 states and 124174 transitions. Second operand has 3 states, 3 states have (on average 40.333333333333336) internal successors, (121), 2 states have internal predecessors, (121), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2022-12-14 12:13:55,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:13:55,970 INFO L93 Difference]: Finished difference Result 247316 states and 374551 transitions. [2022-12-14 12:13:55,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 12:13:55,971 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 40.333333333333336) internal successors, (121), 2 states have internal predecessors, (121), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 189 [2022-12-14 12:13:55,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:13:56,529 INFO L225 Difference]: With dead ends: 247316 [2022-12-14 12:13:56,529 INFO L226 Difference]: Without dead ends: 164367 [2022-12-14 12:13:56,673 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 191 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-12-14 12:13:56,673 INFO L413 NwaCegarLoop]: 230 mSDtfsCounter, 165 mSDsluCounter, 202 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 165 SdHoareTripleChecker+Valid, 432 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 12:13:56,673 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [165 Valid, 432 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 12:13:56,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164367 states. [2022-12-14 12:14:06,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164367 to 163595. [2022-12-14 12:14:06,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 163595 states, 140548 states have (on average 1.5008964908785611) internal successors, (210948), 141062 states have internal predecessors, (210948), 16390 states have call successors, (16390), 6657 states have call predecessors, (16390), 6656 states have return successors, (16388), 15876 states have call predecessors, (16388), 16388 states have call successors, (16388) [2022-12-14 12:14:06,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163595 states to 163595 states and 243726 transitions. [2022-12-14 12:14:06,548 INFO L78 Accepts]: Start accepts. Automaton has 163595 states and 243726 transitions. Word has length 189 [2022-12-14 12:14:06,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:14:06,548 INFO L495 AbstractCegarLoop]: Abstraction has 163595 states and 243726 transitions. [2022-12-14 12:14:06,548 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 40.333333333333336) internal successors, (121), 2 states have internal predecessors, (121), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2022-12-14 12:14:06,548 INFO L276 IsEmpty]: Start isEmpty. Operand 163595 states and 243726 transitions. [2022-12-14 12:14:06,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2022-12-14 12:14:06,797 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:14:06,797 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, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:14:06,802 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2022-12-14 12:14:06,997 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:14:06,998 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:14:06,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:14:06,999 INFO L85 PathProgramCache]: Analyzing trace with hash 692230257, now seen corresponding path program 1 times [2022-12-14 12:14:07,000 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:14:07,000 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1191294319] [2022-12-14 12:14:07,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:14:07,001 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:14:07,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:14:07,221 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 10 proven. 69 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2022-12-14 12:14:07,221 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:14:07,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1191294319] [2022-12-14 12:14:07,221 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1191294319] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:14:07,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [226423369] [2022-12-14 12:14:07,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:14:07,222 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:14:07,222 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:14:07,223 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:14:07,223 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-12-14 12:14:07,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:14:07,349 INFO L263 TraceCheckSpWp]: Trace formula consists of 1166 conjuncts, 2 conjunts are in the unsatisfiable core [2022-12-14 12:14:07,351 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:14:07,455 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 95 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-12-14 12:14:07,455 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 12:14:07,455 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [226423369] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 12:14:07,455 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-12-14 12:14:07,455 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [6] total 7 [2022-12-14 12:14:07,455 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1490801791] [2022-12-14 12:14:07,455 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 12:14:07,455 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 12:14:07,456 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:14:07,456 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 12:14:07,456 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-12-14 12:14:07,456 INFO L87 Difference]: Start difference. First operand 163595 states and 243726 transitions. Second operand has 3 states, 3 states have (on average 42.333333333333336) internal successors, (127), 2 states have internal predecessors, (127), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2022-12-14 12:14:25,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:14:25,589 INFO L93 Difference]: Finished difference Result 487700 states and 734743 transitions. [2022-12-14 12:14:25,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 12:14:25,590 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 42.333333333333336) internal successors, (127), 2 states have internal predecessors, (127), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 189 [2022-12-14 12:14:25,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:14:26,620 INFO L225 Difference]: With dead ends: 487700 [2022-12-14 12:14:26,621 INFO L226 Difference]: Without dead ends: 324111 [2022-12-14 12:14:26,918 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 191 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-12-14 12:14:26,919 INFO L413 NwaCegarLoop]: 230 mSDtfsCounter, 165 mSDsluCounter, 202 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 165 SdHoareTripleChecker+Valid, 432 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 12:14:26,919 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [165 Valid, 432 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 12:14:27,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 324111 states. [2022-12-14 12:14:45,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 324111 to 322571. [2022-12-14 12:14:45,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 322571 states, 277508 states have (on average 1.4944578174322902) internal successors, (414724), 278534 states have internal predecessors, (414724), 31750 states have call successors, (31750), 13313 states have call predecessors, (31750), 13312 states have return successors, (31748), 30724 states have call predecessors, (31748), 31748 states have call successors, (31748) [2022-12-14 12:14:46,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 322571 states to 322571 states and 478222 transitions. [2022-12-14 12:14:46,865 INFO L78 Accepts]: Start accepts. Automaton has 322571 states and 478222 transitions. Word has length 189 [2022-12-14 12:14:46,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:14:46,865 INFO L495 AbstractCegarLoop]: Abstraction has 322571 states and 478222 transitions. [2022-12-14 12:14:46,865 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 42.333333333333336) internal successors, (127), 2 states have internal predecessors, (127), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2022-12-14 12:14:46,865 INFO L276 IsEmpty]: Start isEmpty. Operand 322571 states and 478222 transitions. [2022-12-14 12:14:47,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2022-12-14 12:14:47,399 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:14:47,400 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, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:14:47,406 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-12-14 12:14:47,600 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:14:47,601 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:14:47,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:14:47,602 INFO L85 PathProgramCache]: Analyzing trace with hash 1870683964, now seen corresponding path program 1 times [2022-12-14 12:14:47,602 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:14:47,603 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1812585228] [2022-12-14 12:14:47,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:14:47,603 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:14:47,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:14:47,801 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 10 proven. 69 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2022-12-14 12:14:47,802 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:14:47,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1812585228] [2022-12-14 12:14:47,802 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1812585228] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:14:47,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1071225414] [2022-12-14 12:14:47,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:14:47,802 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:14:47,802 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:14:47,803 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:14:47,804 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-12-14 12:14:47,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:14:47,959 INFO L263 TraceCheckSpWp]: Trace formula consists of 1159 conjuncts, 2 conjunts are in the unsatisfiable core [2022-12-14 12:14:47,962 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:14:48,067 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 91 proven. 0 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2022-12-14 12:14:48,067 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 12:14:48,067 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1071225414] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 12:14:48,067 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-12-14 12:14:48,067 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [6] total 7 [2022-12-14 12:14:48,068 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [908166230] [2022-12-14 12:14:48,068 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 12:14:48,068 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 12:14:48,068 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:14:48,069 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 12:14:48,069 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-12-14 12:14:48,069 INFO L87 Difference]: Start difference. First operand 322571 states and 478222 transitions. Second operand has 3 states, 3 states have (on average 40.666666666666664) internal successors, (122), 2 states have internal predecessors, (122), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2022-12-14 12:15:16,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:15:16,608 INFO L93 Difference]: Finished difference Result 807444 states and 1205271 transitions. [2022-12-14 12:15:16,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 12:15:16,609 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 40.666666666666664) internal successors, (122), 2 states have internal predecessors, (122), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 188 [2022-12-14 12:15:16,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:15:18,337 INFO L225 Difference]: With dead ends: 807444 [2022-12-14 12:15:18,337 INFO L226 Difference]: Without dead ends: 484879 [2022-12-14 12:15:18,855 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 190 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-12-14 12:15:18,856 INFO L413 NwaCegarLoop]: 230 mSDtfsCounter, 165 mSDsluCounter, 202 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 165 SdHoareTripleChecker+Valid, 432 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 12:15:18,856 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [165 Valid, 432 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 12:15:19,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 484879 states. [2022-12-14 12:15:47,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 484879 to 483339. [2022-12-14 12:15:47,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 483339 states, 416260 states have (on average 1.4895401912266373) internal successors, (620036), 417798 states have internal predecessors, (620036), 47110 states have call successors, (47110), 19969 states have call predecessors, (47110), 19968 states have return successors, (47108), 45572 states have call predecessors, (47108), 47108 states have call successors, (47108) [2022-12-14 12:15:49,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 483339 states to 483339 states and 714254 transitions. [2022-12-14 12:15:49,460 INFO L78 Accepts]: Start accepts. Automaton has 483339 states and 714254 transitions. Word has length 188 [2022-12-14 12:15:49,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:15:49,460 INFO L495 AbstractCegarLoop]: Abstraction has 483339 states and 714254 transitions. [2022-12-14 12:15:49,460 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 40.666666666666664) internal successors, (122), 2 states have internal predecessors, (122), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2022-12-14 12:15:49,460 INFO L276 IsEmpty]: Start isEmpty. Operand 483339 states and 714254 transitions. [2022-12-14 12:15:50,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2022-12-14 12:15:50,267 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:15:50,267 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, 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, 1, 1] [2022-12-14 12:15:50,274 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2022-12-14 12:15:50,468 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:15:50,469 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:15:50,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:15:50,470 INFO L85 PathProgramCache]: Analyzing trace with hash 782885350, now seen corresponding path program 1 times [2022-12-14 12:15:50,470 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:15:50,471 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1389763755] [2022-12-14 12:15:50,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:15:50,471 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:15:50,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:15:50,555 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2022-12-14 12:15:50,555 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:15:50,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1389763755] [2022-12-14 12:15:50,555 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1389763755] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 12:15:50,555 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 12:15:50,555 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 12:15:50,555 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [80205831] [2022-12-14 12:15:50,555 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 12:15:50,556 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 12:15:50,556 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:15:50,556 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 12:15:50,556 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 12:15:50,556 INFO L87 Difference]: Start difference. First operand 483339 states and 714254 transitions. Second operand has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 states have internal predecessors, (79), 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) [2022-12-14 12:16:35,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:16:35,359 INFO L93 Difference]: Finished difference Result 1207572 states and 1795351 transitions. [2022-12-14 12:16:35,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 12:16:35,360 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 states have internal predecessors, (79), 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 168 [2022-12-14 12:16:35,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:16:37,990 INFO L225 Difference]: With dead ends: 1207572 [2022-12-14 12:16:37,990 INFO L226 Difference]: Without dead ends: 724239 [2022-12-14 12:16:39,205 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 [2022-12-14 12:16:39,206 INFO L413 NwaCegarLoop]: 261 mSDtfsCounter, 226 mSDsluCounter, 202 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 226 SdHoareTripleChecker+Valid, 463 SdHoareTripleChecker+Invalid, 95 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 12:16:39,206 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [226 Valid, 463 Invalid, 95 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 93 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 12:16:39,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 724239 states. [2022-12-14 12:17:22,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 724239 to 721931. [2022-12-14 12:17:23,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 721931 states, 622084 states have (on average 1.4827129455186117) internal successors, (922372), 624390 states have internal predecessors, (922372), 69894 states have call successors, (69894), 29953 states have call predecessors, (69894), 29952 states have return successors, (69892), 67588 states have call predecessors, (69892), 69892 states have call successors, (69892) [2022-12-14 12:17:26,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 721931 states to 721931 states and 1062158 transitions. [2022-12-14 12:17:26,229 INFO L78 Accepts]: Start accepts. Automaton has 721931 states and 1062158 transitions. Word has length 168 [2022-12-14 12:17:26,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:17:26,229 INFO L495 AbstractCegarLoop]: Abstraction has 721931 states and 1062158 transitions. [2022-12-14 12:17:26,229 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 states have internal predecessors, (79), 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) [2022-12-14 12:17:26,229 INFO L276 IsEmpty]: Start isEmpty. Operand 721931 states and 1062158 transitions. [2022-12-14 12:17:27,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 193 [2022-12-14 12:17:27,825 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:17:27,825 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, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:17:27,825 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2022-12-14 12:17:27,826 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:17:27,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:17:27,826 INFO L85 PathProgramCache]: Analyzing trace with hash 1202620601, now seen corresponding path program 1 times [2022-12-14 12:17:27,826 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:17:27,826 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1438592135] [2022-12-14 12:17:27,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:17:27,827 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:17:27,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:17:28,091 INFO L134 CoverageAnalysis]: Checked inductivity of 143 backedges. 10 proven. 69 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2022-12-14 12:17:28,091 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:17:28,091 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1438592135] [2022-12-14 12:17:28,091 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1438592135] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:17:28,091 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [810512768] [2022-12-14 12:17:28,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:17:28,092 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:17:28,092 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:17:28,093 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:17:28,093 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9d24134-af9b-4ca9-a192-f29816afeba8/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-12-14 12:17:28,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:17:28,378 INFO L263 TraceCheckSpWp]: Trace formula consists of 1180 conjuncts, 3 conjunts are in the unsatisfiable core [2022-12-14 12:17:28,381 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:17:28,414 INFO L134 CoverageAnalysis]: Checked inductivity of 143 backedges. 111 proven. 0 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-12-14 12:17:28,414 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 12:17:28,414 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [810512768] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 12:17:28,414 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-12-14 12:17:28,414 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2022-12-14 12:17:28,415 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [290902104] [2022-12-14 12:17:28,415 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 12:17:28,415 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 12:17:28,415 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:17:28,416 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 12:17:28,416 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-12-14 12:17:28,416 INFO L87 Difference]: Start difference. First operand 721931 states and 1062158 transitions. Second operand has 3 states, 3 states have (on average 46.333333333333336) internal successors, (139), 3 states have internal predecessors, (139), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2022-12-14 12:18:16,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:18:16,140 INFO L93 Difference]: Finished difference Result 1206803 states and 1805076 transitions. [2022-12-14 12:18:16,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 12:18:16,141 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 46.333333333333336) internal successors, (139), 3 states have internal predecessors, (139), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 192 [2022-12-14 12:18:16,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:18:18,565 INFO L225 Difference]: With dead ends: 1206803 [2022-12-14 12:18:18,566 INFO L226 Difference]: Without dead ends: 723471 [2022-12-14 12:18:19,726 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 194 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-12-14 12:18:19,727 INFO L413 NwaCegarLoop]: 379 mSDtfsCounter, 214 mSDsluCounter, 204 mSDsCounter, 0 mSdLazyCounter, 123 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 214 SdHoareTripleChecker+Valid, 583 SdHoareTripleChecker+Invalid, 125 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 123 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 12:18:19,727 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [214 Valid, 583 Invalid, 125 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 123 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 12:18:20,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 723471 states. [2022-12-14 12:19:08,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 723471 to 720395. [2022-12-14 12:19:08,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 720395 states, 620548 states have (on average 1.4715316139927934) internal successors, (913156), 622854 states have internal predecessors, (913156), 69894 states have call successors, (69894), 29953 states have call predecessors, (69894), 29952 states have return successors, (69892), 67588 states have call predecessors, (69892), 69892 states have call successors, (69892) [2022-12-14 12:19:11,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 720395 states to 720395 states and 1052942 transitions. [2022-12-14 12:19:11,721 INFO L78 Accepts]: Start accepts. Automaton has 720395 states and 1052942 transitions. Word has length 192 [2022-12-14 12:19:11,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:19:11,721 INFO L495 AbstractCegarLoop]: Abstraction has 720395 states and 1052942 transitions. [2022-12-14 12:19:11,721 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 46.333333333333336) internal successors, (139), 3 states have internal predecessors, (139), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2022-12-14 12:19:11,721 INFO L276 IsEmpty]: Start isEmpty. Operand 720395 states and 1052942 transitions.