./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound5.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 5e519f3a Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound5.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI --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 1aca3c96522e618238f11f200c96e0ec490e756d4e04895bd2a51f9a4ff85af1 --- 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-5e519f3 [2022-11-03 02:31:27,517 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-03 02:31:27,520 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-03 02:31:27,583 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-03 02:31:27,584 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-03 02:31:27,589 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-03 02:31:27,592 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-03 02:31:27,596 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-03 02:31:27,603 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-03 02:31:27,605 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-03 02:31:27,607 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-03 02:31:27,608 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-03 02:31:27,608 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-03 02:31:27,610 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-03 02:31:27,611 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-03 02:31:27,612 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-03 02:31:27,614 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-03 02:31:27,615 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-03 02:31:27,620 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-03 02:31:27,629 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-03 02:31:27,633 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-03 02:31:27,638 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-03 02:31:27,643 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-03 02:31:27,644 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-03 02:31:27,650 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-03 02:31:27,651 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-03 02:31:27,651 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-03 02:31:27,652 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-03 02:31:27,653 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-03 02:31:27,654 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-03 02:31:27,654 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-03 02:31:27,655 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-03 02:31:27,656 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-03 02:31:27,656 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-03 02:31:27,657 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-03 02:31:27,658 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-03 02:31:27,658 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-03 02:31:27,659 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-03 02:31:27,659 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-03 02:31:27,660 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-03 02:31:27,666 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-03 02:31:27,667 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-03 02:31:27,708 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-03 02:31:27,709 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-03 02:31:27,709 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-03 02:31:27,710 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-03 02:31:27,710 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-03 02:31:27,711 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-03 02:31:27,711 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-03 02:31:27,711 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-03 02:31:27,711 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-03 02:31:27,712 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-03 02:31:27,713 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-03 02:31:27,713 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-03 02:31:27,713 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-03 02:31:27,713 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-03 02:31:27,714 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-03 02:31:27,714 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-03 02:31:27,714 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-03 02:31:27,714 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-03 02:31:27,715 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-03 02:31:27,715 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-03 02:31:27,715 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-03 02:31:27,716 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-03 02:31:27,716 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-03 02:31:27,716 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-03 02:31:27,716 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-03 02:31:27,716 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-03 02:31:27,717 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-03 02:31:27,717 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-03 02:31:27,717 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-03 02:31:27,717 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-03 02:31:27,718 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-03 02:31:27,718 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-03 02:31:27,718 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 02:31:27,719 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-03 02:31:27,719 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-03 02:31:27,720 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-03 02:31:27,720 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-03 02:31:27,720 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-03 02:31:27,720 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-03 02:31:27,720 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-03 02:31:27,721 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-03 02:31:27,721 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_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1aca3c96522e618238f11f200c96e0ec490e756d4e04895bd2a51f9a4ff85af1 [2022-11-03 02:31:28,043 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-03 02:31:28,076 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-03 02:31:28,079 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-03 02:31:28,080 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-03 02:31:28,081 INFO L275 PluginConnector]: CDTParser initialized [2022-11-03 02:31:28,082 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound5.c [2022-11-03 02:31:28,172 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/data/d389a4947/a2b4f60b04bf4b59b06925394abd6213/FLAGf0a039de2 [2022-11-03 02:31:28,753 INFO L306 CDTParser]: Found 1 translation units. [2022-11-03 02:31:28,754 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound5.c [2022-11-03 02:31:28,769 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/data/d389a4947/a2b4f60b04bf4b59b06925394abd6213/FLAGf0a039de2 [2022-11-03 02:31:29,116 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/data/d389a4947/a2b4f60b04bf4b59b06925394abd6213 [2022-11-03 02:31:29,119 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-03 02:31:29,121 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-03 02:31:29,128 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-03 02:31:29,128 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-03 02:31:29,132 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-03 02:31:29,133 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 02:31:29" (1/1) ... [2022-11-03 02:31:29,134 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@979434b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:31:29, skipping insertion in model container [2022-11-03 02:31:29,134 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 02:31:29" (1/1) ... [2022-11-03 02:31:29,144 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-03 02:31:29,164 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-03 02:31:29,348 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound5.c[490,503] [2022-11-03 02:31:29,366 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 02:31:29,375 INFO L203 MainTranslator]: Completed pre-run [2022-11-03 02:31:29,387 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound5.c[490,503] [2022-11-03 02:31:29,397 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 02:31:29,410 INFO L208 MainTranslator]: Completed translation [2022-11-03 02:31:29,410 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:31:29 WrapperNode [2022-11-03 02:31:29,411 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-03 02:31:29,412 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-03 02:31:29,412 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-03 02:31:29,412 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-03 02:31:29,420 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:31:29" (1/1) ... [2022-11-03 02:31:29,426 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:31:29" (1/1) ... [2022-11-03 02:31:29,444 INFO L138 Inliner]: procedures = 14, calls = 16, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 80 [2022-11-03 02:31:29,445 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-03 02:31:29,445 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-03 02:31:29,446 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-03 02:31:29,446 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-03 02:31:29,455 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:31:29" (1/1) ... [2022-11-03 02:31:29,455 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:31:29" (1/1) ... [2022-11-03 02:31:29,470 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:31:29" (1/1) ... [2022-11-03 02:31:29,472 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:31:29" (1/1) ... [2022-11-03 02:31:29,475 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:31:29" (1/1) ... [2022-11-03 02:31:29,483 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:31:29" (1/1) ... [2022-11-03 02:31:29,486 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:31:29" (1/1) ... [2022-11-03 02:31:29,498 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:31:29" (1/1) ... [2022-11-03 02:31:29,500 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-03 02:31:29,501 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-03 02:31:29,501 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-03 02:31:29,501 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-03 02:31:29,502 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:31:29" (1/1) ... [2022-11-03 02:31:29,509 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 02:31:29,521 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:31:29,533 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-03 02:31:29,555 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-03 02:31:29,582 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-03 02:31:29,582 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-11-03 02:31:29,582 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-11-03 02:31:29,582 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-03 02:31:29,583 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-03 02:31:29,583 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-03 02:31:29,583 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-03 02:31:29,583 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-03 02:31:29,646 INFO L235 CfgBuilder]: Building ICFG [2022-11-03 02:31:29,648 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-03 02:31:29,836 INFO L276 CfgBuilder]: Performing block encoding [2022-11-03 02:31:29,894 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-03 02:31:29,894 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-11-03 02:31:29,897 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 02:31:29 BoogieIcfgContainer [2022-11-03 02:31:29,912 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-03 02:31:29,915 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-03 02:31:29,915 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-03 02:31:29,919 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-03 02:31:29,919 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.11 02:31:29" (1/3) ... [2022-11-03 02:31:29,920 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2a2f9080 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 02:31:29, skipping insertion in model container [2022-11-03 02:31:29,920 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:31:29" (2/3) ... [2022-11-03 02:31:29,921 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2a2f9080 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 02:31:29, skipping insertion in model container [2022-11-03 02:31:29,921 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 02:31:29" (3/3) ... [2022-11-03 02:31:29,923 INFO L112 eAbstractionObserver]: Analyzing ICFG egcd3-ll_valuebound5.c [2022-11-03 02:31:29,960 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-03 02:31:29,969 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-03 02:31:30,057 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-03 02:31:30,072 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;@600918ca, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-03 02:31:30,073 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-03 02:31:30,077 INFO L276 IsEmpty]: Start isEmpty. Operand has 30 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 18 states have internal predecessors, (25), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-03 02:31:30,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-03 02:31:30,086 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:31:30,087 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:31:30,087 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:31:30,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:31:30,093 INFO L85 PathProgramCache]: Analyzing trace with hash 1539547475, now seen corresponding path program 1 times [2022-11-03 02:31:30,103 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:31:30,104 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [673963066] [2022-11-03 02:31:30,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:31:30,105 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:31:30,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:31:30,310 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:31:30,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [673963066] [2022-11-03 02:31:30,311 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2022-11-03 02:31:30,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [27413592] [2022-11-03 02:31:30,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:31:30,313 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:31:30,313 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:31:30,318 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:31:30,340 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-03 02:31:30,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:31:30,443 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 1 conjunts are in the unsatisfiable core [2022-11-03 02:31:30,449 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:31:30,489 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-03 02:31:30,490 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 02:31:30,491 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [27413592] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:31:30,492 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:31:30,492 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-03 02:31:30,495 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [669118496] [2022-11-03 02:31:30,497 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:31:30,502 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-03 02:31:30,502 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:31:30,542 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-03 02:31:30,543 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-03 02:31:30,546 INFO L87 Difference]: Start difference. First operand has 30 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 18 states have internal predecessors, (25), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Second operand has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-03 02:31:30,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:31:30,606 INFO L93 Difference]: Finished difference Result 51 states and 79 transitions. [2022-11-03 02:31:30,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-03 02:31:30,609 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 20 [2022-11-03 02:31:30,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:31:30,622 INFO L225 Difference]: With dead ends: 51 [2022-11-03 02:31:30,622 INFO L226 Difference]: Without dead ends: 28 [2022-11-03 02:31:30,625 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-03 02:31:30,631 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:31:30,633 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 36 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 02:31:30,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-11-03 02:31:30,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2022-11-03 02:31:30,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 16 states have (on average 1.25) internal successors, (20), 17 states have internal predecessors, (20), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-11-03 02:31:30,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 37 transitions. [2022-11-03 02:31:30,675 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 37 transitions. Word has length 20 [2022-11-03 02:31:30,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:31:30,677 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 37 transitions. [2022-11-03 02:31:30,678 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-03 02:31:30,678 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 37 transitions. [2022-11-03 02:31:30,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-03 02:31:30,679 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:31:30,680 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:31:30,722 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-03 02:31:30,904 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2022-11-03 02:31:30,905 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:31:30,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:31:30,906 INFO L85 PathProgramCache]: Analyzing trace with hash 1863391506, now seen corresponding path program 1 times [2022-11-03 02:31:30,906 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:31:30,906 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2004925195] [2022-11-03 02:31:30,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:31:30,907 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:31:30,931 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:31:30,934 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1194812581] [2022-11-03 02:31:30,935 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:31:30,935 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:31:30,935 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:31:30,936 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:31:30,946 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-03 02:31:31,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:31:31,009 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-03 02:31:31,011 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:31:31,107 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-03 02:31:31,107 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 02:31:31,107 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:31:31,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2004925195] [2022-11-03 02:31:31,108 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:31:31,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1194812581] [2022-11-03 02:31:31,108 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1194812581] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:31:31,108 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:31:31,109 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-03 02:31:31,109 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1962059526] [2022-11-03 02:31:31,109 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:31:31,110 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-03 02:31:31,130 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:31:31,130 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-03 02:31:31,130 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-03 02:31:31,131 INFO L87 Difference]: Start difference. First operand 28 states and 37 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-03 02:31:31,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:31:31,317 INFO L93 Difference]: Finished difference Result 47 states and 62 transitions. [2022-11-03 02:31:31,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-03 02:31:31,319 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 21 [2022-11-03 02:31:31,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:31:31,320 INFO L225 Difference]: With dead ends: 47 [2022-11-03 02:31:31,321 INFO L226 Difference]: Without dead ends: 40 [2022-11-03 02:31:31,321 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-03 02:31:31,322 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 29 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:31:31,323 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 78 Invalid, 68 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 02:31:31,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-11-03 02:31:31,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 30. [2022-11-03 02:31:31,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 19 states have internal predecessors, (22), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-11-03 02:31:31,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 39 transitions. [2022-11-03 02:31:31,337 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 39 transitions. Word has length 21 [2022-11-03 02:31:31,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:31:31,338 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 39 transitions. [2022-11-03 02:31:31,339 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-03 02:31:31,339 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 39 transitions. [2022-11-03 02:31:31,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-03 02:31:31,341 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:31:31,341 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:31:31,363 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-03 02:31:31,542 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:31:31,542 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:31:31,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:31:31,543 INFO L85 PathProgramCache]: Analyzing trace with hash -73319670, now seen corresponding path program 1 times [2022-11-03 02:31:31,543 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:31:31,544 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1732845570] [2022-11-03 02:31:31,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:31:31,544 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:31:31,583 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:31:31,587 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1029722100] [2022-11-03 02:31:31,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:31:31,593 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:31:31,593 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:31:31,604 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:31:31,611 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-03 02:31:31,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:31:31,680 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-03 02:31:31,683 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:31:31,809 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-03 02:31:31,810 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 02:31:31,810 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:31:31,810 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1732845570] [2022-11-03 02:31:31,810 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:31:31,810 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1029722100] [2022-11-03 02:31:31,811 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1029722100] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:31:31,811 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:31:31,811 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-03 02:31:31,811 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [885808018] [2022-11-03 02:31:31,811 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:31:31,812 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-03 02:31:31,812 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:31:31,812 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-03 02:31:31,813 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-03 02:31:31,813 INFO L87 Difference]: Start difference. First operand 30 states and 39 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-03 02:31:31,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:31:31,876 INFO L93 Difference]: Finished difference Result 46 states and 60 transitions. [2022-11-03 02:31:31,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-03 02:31:31,877 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 24 [2022-11-03 02:31:31,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:31:31,879 INFO L225 Difference]: With dead ends: 46 [2022-11-03 02:31:31,879 INFO L226 Difference]: Without dead ends: 44 [2022-11-03 02:31:31,879 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-03 02:31:31,880 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 9 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 118 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:31:31,881 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 118 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 02:31:31,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-11-03 02:31:31,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2022-11-03 02:31:31,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 27 states have internal predecessors, (32), 13 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-11-03 02:31:31,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 57 transitions. [2022-11-03 02:31:31,894 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 57 transitions. Word has length 24 [2022-11-03 02:31:31,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:31:31,895 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 57 transitions. [2022-11-03 02:31:31,895 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-03 02:31:31,895 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 57 transitions. [2022-11-03 02:31:31,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-03 02:31:31,896 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:31:31,896 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:31:31,925 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-03 02:31:32,111 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:31:32,111 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:31:32,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:31:32,112 INFO L85 PathProgramCache]: Analyzing trace with hash -1101454984, now seen corresponding path program 1 times [2022-11-03 02:31:32,112 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:31:32,112 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1573094170] [2022-11-03 02:31:32,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:31:32,113 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:31:32,134 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:31:32,134 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [678803171] [2022-11-03 02:31:32,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:31:32,134 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:31:32,135 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:31:32,136 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:31:32,152 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-03 02:31:32,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:31:32,204 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-03 02:31:32,206 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:31:32,296 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-03 02:31:32,296 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:31:32,409 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-03 02:31:32,410 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:31:32,410 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1573094170] [2022-11-03 02:31:32,410 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:31:32,410 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [678803171] [2022-11-03 02:31:32,411 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [678803171] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:31:32,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [531858456] [2022-11-03 02:31:32,434 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-03 02:31:32,434 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:31:32,438 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:31:32,445 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:31:32,456 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:31:33,724 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-03 02:31:33,756 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:31:36,113 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [531858456] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:31:36,114 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-03 02:31:36,114 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [7, 7] total 18 [2022-11-03 02:31:36,115 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [759138248] [2022-11-03 02:31:36,115 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:31:36,115 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-03 02:31:36,116 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:31:36,116 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-03 02:31:36,117 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=214, Unknown=0, NotChecked=0, Total=306 [2022-11-03 02:31:36,117 INFO L87 Difference]: Start difference. First operand 43 states and 57 transitions. Second operand has 13 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-03 02:31:36,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:31:36,461 INFO L93 Difference]: Finished difference Result 71 states and 97 transitions. [2022-11-03 02:31:36,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-03 02:31:36,463 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 26 [2022-11-03 02:31:36,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:31:36,469 INFO L225 Difference]: With dead ends: 71 [2022-11-03 02:31:36,470 INFO L226 Difference]: Without dead ends: 64 [2022-11-03 02:31:36,471 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 54 SyntacticMatches, 6 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=92, Invalid=214, Unknown=0, NotChecked=0, Total=306 [2022-11-03 02:31:36,473 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 50 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 111 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 111 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 02:31:36,480 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [62 Valid, 40 Invalid, 144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 111 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 02:31:36,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2022-11-03 02:31:36,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 50. [2022-11-03 02:31:36,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 33 states have (on average 1.2424242424242424) internal successors, (41), 34 states have internal predecessors, (41), 13 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-11-03 02:31:36,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 66 transitions. [2022-11-03 02:31:36,530 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 66 transitions. Word has length 26 [2022-11-03 02:31:36,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:31:36,530 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 66 transitions. [2022-11-03 02:31:36,531 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-03 02:31:36,531 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 66 transitions. [2022-11-03 02:31:36,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-03 02:31:36,533 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:31:36,533 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:31:36,576 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-03 02:31:36,748 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2022-11-03 02:31:36,748 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:31:36,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:31:36,749 INFO L85 PathProgramCache]: Analyzing trace with hash -156943002, now seen corresponding path program 1 times [2022-11-03 02:31:36,749 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:31:36,749 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [164931553] [2022-11-03 02:31:36,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:31:36,750 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:31:36,775 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:31:36,776 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1903774228] [2022-11-03 02:31:36,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:31:36,777 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:31:36,778 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:31:36,779 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:31:36,795 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-03 02:31:36,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:31:36,848 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-03 02:31:36,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:31:36,958 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-03 02:31:36,958 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 02:31:36,958 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:31:36,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [164931553] [2022-11-03 02:31:36,959 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:31:36,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1903774228] [2022-11-03 02:31:36,959 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1903774228] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:31:36,959 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:31:36,960 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-03 02:31:36,960 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1071241822] [2022-11-03 02:31:36,960 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:31:36,960 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-03 02:31:36,961 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:31:36,961 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-03 02:31:36,961 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-03 02:31:36,962 INFO L87 Difference]: Start difference. First operand 50 states and 66 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-11-03 02:31:37,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:31:37,058 INFO L93 Difference]: Finished difference Result 58 states and 73 transitions. [2022-11-03 02:31:37,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-03 02:31:37,059 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 29 [2022-11-03 02:31:37,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:31:37,061 INFO L225 Difference]: With dead ends: 58 [2022-11-03 02:31:37,061 INFO L226 Difference]: Without dead ends: 56 [2022-11-03 02:31:37,061 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-03 02:31:37,062 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 9 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:31:37,063 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 112 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:31:37,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-11-03 02:31:37,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 54. [2022-11-03 02:31:37,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 36 states have (on average 1.2222222222222223) internal successors, (44), 37 states have internal predecessors, (44), 13 states have call successors, (13), 4 states have call predecessors, (13), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-11-03 02:31:37,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 69 transitions. [2022-11-03 02:31:37,092 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 69 transitions. Word has length 29 [2022-11-03 02:31:37,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:31:37,092 INFO L495 AbstractCegarLoop]: Abstraction has 54 states and 69 transitions. [2022-11-03 02:31:37,093 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-11-03 02:31:37,093 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 69 transitions. [2022-11-03 02:31:37,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-03 02:31:37,094 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:31:37,094 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:31:37,139 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-03 02:31:37,307 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:31:37,307 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:31:37,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:31:37,308 INFO L85 PathProgramCache]: Analyzing trace with hash 187338980, now seen corresponding path program 1 times [2022-11-03 02:31:37,308 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:31:37,308 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2116797218] [2022-11-03 02:31:37,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:31:37,309 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:31:37,331 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:31:37,335 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1391582311] [2022-11-03 02:31:37,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:31:37,335 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:31:37,336 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:31:37,337 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:31:37,361 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-03 02:31:37,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:31:37,406 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-03 02:31:37,408 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:31:37,500 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-03 02:31:37,501 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:31:37,647 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-03 02:31:37,647 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:31:37,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2116797218] [2022-11-03 02:31:37,648 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:31:37,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1391582311] [2022-11-03 02:31:37,648 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1391582311] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:31:37,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [250187112] [2022-11-03 02:31:37,651 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-11-03 02:31:37,651 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:31:37,652 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:31:37,652 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:31:37,652 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:31:38,455 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 38 for LOIs [2022-11-03 02:31:38,461 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-03 02:31:38,479 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:31:41,162 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [250187112] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:31:41,163 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-03 02:31:41,163 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [6, 6] total 22 [2022-11-03 02:31:41,164 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [425249146] [2022-11-03 02:31:41,164 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:31:41,164 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-03 02:31:41,164 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:31:41,165 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-03 02:31:41,165 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=358, Unknown=0, NotChecked=0, Total=462 [2022-11-03 02:31:41,166 INFO L87 Difference]: Start difference. First operand 54 states and 69 transitions. Second operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 9 states have internal predecessors, (14), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-03 02:31:41,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:31:41,652 INFO L93 Difference]: Finished difference Result 96 states and 128 transitions. [2022-11-03 02:31:41,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-03 02:31:41,663 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 9 states have internal predecessors, (14), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 29 [2022-11-03 02:31:41,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:31:41,665 INFO L225 Difference]: With dead ends: 96 [2022-11-03 02:31:41,667 INFO L226 Difference]: Without dead ends: 94 [2022-11-03 02:31:41,668 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 61 SyntacticMatches, 4 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=104, Invalid=358, Unknown=0, NotChecked=0, Total=462 [2022-11-03 02:31:41,669 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 96 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 173 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 112 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 242 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 173 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 02:31:41,670 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [112 Valid, 45 Invalid, 242 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 173 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-03 02:31:41,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2022-11-03 02:31:41,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 88. [2022-11-03 02:31:41,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 51 states have (on average 1.196078431372549) internal successors, (61), 54 states have internal predecessors, (61), 29 states have call successors, (29), 7 states have call predecessors, (29), 7 states have return successors, (28), 26 states have call predecessors, (28), 28 states have call successors, (28) [2022-11-03 02:31:41,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 118 transitions. [2022-11-03 02:31:41,732 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 118 transitions. Word has length 29 [2022-11-03 02:31:41,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:31:41,735 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 118 transitions. [2022-11-03 02:31:41,735 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 9 states have internal predecessors, (14), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-03 02:31:41,735 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 118 transitions. [2022-11-03 02:31:41,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-11-03 02:31:41,745 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:31:41,746 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 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] [2022-11-03 02:31:41,780 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-11-03 02:31:41,960 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:31:41,961 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:31:41,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:31:41,961 INFO L85 PathProgramCache]: Analyzing trace with hash -1193022788, now seen corresponding path program 1 times [2022-11-03 02:31:41,961 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:31:41,961 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1078611203] [2022-11-03 02:31:41,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:31:41,961 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:31:41,974 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:31:41,974 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1911440535] [2022-11-03 02:31:41,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:31:41,975 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:31:41,975 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:31:41,976 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:31:41,985 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-03 02:31:42,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:31:42,040 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 50 conjunts are in the unsatisfiable core [2022-11-03 02:31:42,043 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:31:42,519 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 10 proven. 11 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2022-11-03 02:31:42,519 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:31:43,315 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 10 proven. 11 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2022-11-03 02:31:43,315 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:31:43,315 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1078611203] [2022-11-03 02:31:43,316 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:31:43,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1911440535] [2022-11-03 02:31:43,316 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1911440535] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:31:43,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [293617233] [2022-11-03 02:31:43,321 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-03 02:31:43,321 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:31:43,323 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:31:43,323 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:31:43,323 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:31:51,689 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-03 02:31:51,698 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-03 02:31:51,714 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:31:59,451 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1999#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:31:59,452 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:31:59,452 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 02:31:59,452 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 20 [2022-11-03 02:31:59,452 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1148255015] [2022-11-03 02:31:59,452 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 02:31:59,453 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-03 02:31:59,453 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:31:59,454 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-03 02:31:59,455 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=1393, Unknown=0, NotChecked=0, Total=1560 [2022-11-03 02:31:59,455 INFO L87 Difference]: Start difference. First operand 88 states and 118 transitions. Second operand has 20 states, 18 states have (on average 2.2222222222222223) internal successors, (40), 19 states have internal predecessors, (40), 6 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-11-03 02:32:07,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:32:07,574 INFO L93 Difference]: Finished difference Result 223 states and 326 transitions. [2022-11-03 02:32:07,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-11-03 02:32:07,575 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 18 states have (on average 2.2222222222222223) internal successors, (40), 19 states have internal predecessors, (40), 6 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 51 [2022-11-03 02:32:07,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:32:07,578 INFO L225 Difference]: With dead ends: 223 [2022-11-03 02:32:07,578 INFO L226 Difference]: Without dead ends: 219 [2022-11-03 02:32:07,581 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 109 SyntacticMatches, 4 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1095 ImplicationChecksByTransitivity, 9.6s TimeCoverageRelationStatistics Valid=430, Invalid=3476, Unknown=0, NotChecked=0, Total=3906 [2022-11-03 02:32:07,581 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 137 mSDsluCounter, 223 mSDsCounter, 0 mSdLazyCounter, 1238 mSolverCounterSat, 329 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 144 SdHoareTripleChecker+Valid, 239 SdHoareTripleChecker+Invalid, 1567 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 329 IncrementalHoareTripleChecker+Valid, 1238 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.6s IncrementalHoareTripleChecker+Time [2022-11-03 02:32:07,582 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [144 Valid, 239 Invalid, 1567 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [329 Valid, 1238 Invalid, 0 Unknown, 0 Unchecked, 6.6s Time] [2022-11-03 02:32:07,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2022-11-03 02:32:07,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 163. [2022-11-03 02:32:07,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 163 states, 104 states have (on average 1.2403846153846154) internal successors, (129), 106 states have internal predecessors, (129), 49 states have call successors, (49), 9 states have call predecessors, (49), 9 states have return successors, (48), 47 states have call predecessors, (48), 48 states have call successors, (48) [2022-11-03 02:32:07,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 226 transitions. [2022-11-03 02:32:07,711 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 226 transitions. Word has length 51 [2022-11-03 02:32:07,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:32:07,712 INFO L495 AbstractCegarLoop]: Abstraction has 163 states and 226 transitions. [2022-11-03 02:32:07,712 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 18 states have (on average 2.2222222222222223) internal successors, (40), 19 states have internal predecessors, (40), 6 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-11-03 02:32:07,713 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 226 transitions. [2022-11-03 02:32:07,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-11-03 02:32:07,714 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:32:07,714 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 3, 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] [2022-11-03 02:32:07,752 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-03 02:32:07,940 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:32:07,940 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:32:07,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:32:07,941 INFO L85 PathProgramCache]: Analyzing trace with hash -900294476, now seen corresponding path program 1 times [2022-11-03 02:32:07,941 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:32:07,941 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1214864220] [2022-11-03 02:32:07,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:32:07,941 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:32:07,954 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:32:07,955 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [782557301] [2022-11-03 02:32:07,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:32:07,955 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:32:07,955 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:32:07,956 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:32:07,976 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-03 02:32:08,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:32:08,020 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-03 02:32:08,021 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:32:08,061 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-11-03 02:32:08,061 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 02:32:08,061 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:32:08,061 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1214864220] [2022-11-03 02:32:08,061 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:32:08,062 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [782557301] [2022-11-03 02:32:08,062 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [782557301] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:32:08,062 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:32:08,062 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-03 02:32:08,062 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1500116290] [2022-11-03 02:32:08,062 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:32:08,064 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-03 02:32:08,065 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:32:08,065 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-03 02:32:08,065 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-03 02:32:08,066 INFO L87 Difference]: Start difference. First operand 163 states and 226 transitions. Second operand has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-11-03 02:32:08,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:32:08,231 INFO L93 Difference]: Finished difference Result 266 states and 372 transitions. [2022-11-03 02:32:08,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-03 02:32:08,232 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 54 [2022-11-03 02:32:08,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:32:08,233 INFO L225 Difference]: With dead ends: 266 [2022-11-03 02:32:08,234 INFO L226 Difference]: Without dead ends: 188 [2022-11-03 02:32:08,235 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2022-11-03 02:32:08,235 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 3 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:32:08,236 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 84 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:32:08,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2022-11-03 02:32:08,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 182. [2022-11-03 02:32:08,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 182 states, 115 states have (on average 1.2173913043478262) internal successors, (140), 116 states have internal predecessors, (140), 57 states have call successors, (57), 9 states have call predecessors, (57), 9 states have return successors, (56), 56 states have call predecessors, (56), 56 states have call successors, (56) [2022-11-03 02:32:08,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 253 transitions. [2022-11-03 02:32:08,348 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 253 transitions. Word has length 54 [2022-11-03 02:32:08,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:32:08,348 INFO L495 AbstractCegarLoop]: Abstraction has 182 states and 253 transitions. [2022-11-03 02:32:08,349 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-11-03 02:32:08,349 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 253 transitions. [2022-11-03 02:32:08,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-11-03 02:32:08,353 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:32:08,353 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 4, 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] [2022-11-03 02:32:08,376 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-03 02:32:08,556 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2022-11-03 02:32:08,557 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:32:08,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:32:08,557 INFO L85 PathProgramCache]: Analyzing trace with hash 1047855047, now seen corresponding path program 1 times [2022-11-03 02:32:08,557 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:32:08,557 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2008906508] [2022-11-03 02:32:08,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:32:08,557 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:32:08,569 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:32:08,569 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1131924639] [2022-11-03 02:32:08,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:32:08,570 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:32:08,570 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:32:08,571 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:32:08,573 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-03 02:32:08,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:32:08,628 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 38 conjunts are in the unsatisfiable core [2022-11-03 02:32:08,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:32:09,141 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 30 proven. 11 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2022-11-03 02:32:09,142 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:32:09,425 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 33 proven. 4 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-11-03 02:32:09,425 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:32:09,425 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2008906508] [2022-11-03 02:32:09,425 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:32:09,425 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1131924639] [2022-11-03 02:32:09,426 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1131924639] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:32:09,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2003946314] [2022-11-03 02:32:09,429 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-03 02:32:09,429 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:32:09,430 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:32:09,430 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:32:09,430 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:32:16,054 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-03 02:32:16,058 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-03 02:32:16,072 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:32:18,452 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3912#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:32:18,452 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:32:18,452 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 02:32:18,453 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 9] total 18 [2022-11-03 02:32:18,453 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1693233719] [2022-11-03 02:32:18,453 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 02:32:18,453 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-03 02:32:18,454 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:32:18,454 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-03 02:32:18,454 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=960, Unknown=0, NotChecked=0, Total=1122 [2022-11-03 02:32:18,455 INFO L87 Difference]: Start difference. First operand 182 states and 253 transitions. Second operand has 18 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 14 states have internal predecessors, (32), 8 states have call successors, (23), 2 states have call predecessors, (23), 3 states have return successors, (22), 9 states have call predecessors, (22), 8 states have call successors, (22) [2022-11-03 02:32:19,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:32:19,455 INFO L93 Difference]: Finished difference Result 242 states and 333 transitions. [2022-11-03 02:32:19,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-03 02:32:19,455 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 14 states have internal predecessors, (32), 8 states have call successors, (23), 2 states have call predecessors, (23), 3 states have return successors, (22), 9 states have call predecessors, (22), 8 states have call successors, (22) Word has length 61 [2022-11-03 02:32:19,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:32:19,457 INFO L225 Difference]: With dead ends: 242 [2022-11-03 02:32:19,458 INFO L226 Difference]: Without dead ends: 240 [2022-11-03 02:32:19,459 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 152 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 470 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=242, Invalid=1480, Unknown=0, NotChecked=0, Total=1722 [2022-11-03 02:32:19,459 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 80 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 454 mSolverCounterSat, 114 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 568 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 114 IncrementalHoareTripleChecker+Valid, 454 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-03 02:32:19,460 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [81 Valid, 109 Invalid, 568 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [114 Valid, 454 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-03 02:32:19,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240 states. [2022-11-03 02:32:19,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240 to 194. [2022-11-03 02:32:19,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 194 states, 124 states have (on average 1.2016129032258065) internal successors, (149), 125 states have internal predecessors, (149), 57 states have call successors, (57), 12 states have call predecessors, (57), 12 states have return successors, (56), 56 states have call predecessors, (56), 56 states have call successors, (56) [2022-11-03 02:32:19,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 262 transitions. [2022-11-03 02:32:19,569 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 262 transitions. Word has length 61 [2022-11-03 02:32:19,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:32:19,569 INFO L495 AbstractCegarLoop]: Abstraction has 194 states and 262 transitions. [2022-11-03 02:32:19,569 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 14 states have internal predecessors, (32), 8 states have call successors, (23), 2 states have call predecessors, (23), 3 states have return successors, (22), 9 states have call predecessors, (22), 8 states have call successors, (22) [2022-11-03 02:32:19,569 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 262 transitions. [2022-11-03 02:32:19,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-11-03 02:32:19,571 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:32:19,571 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 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] [2022-11-03 02:32:19,593 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-03 02:32:19,771 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-11-03 02:32:19,772 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:32:19,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:32:19,772 INFO L85 PathProgramCache]: Analyzing trace with hash -94425734, now seen corresponding path program 2 times [2022-11-03 02:32:19,772 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:32:19,772 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [274108811] [2022-11-03 02:32:19,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:32:19,773 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:32:19,784 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:32:19,785 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1949486292] [2022-11-03 02:32:19,785 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:32:19,785 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:32:19,785 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:32:19,786 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:32:19,820 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-03 02:32:19,871 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-03 02:32:19,871 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:32:19,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 47 conjunts are in the unsatisfiable core [2022-11-03 02:32:19,876 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:32:20,372 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 8 proven. 21 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-03 02:32:20,372 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:32:21,199 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 10 proven. 19 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-03 02:32:21,199 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:32:21,200 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [274108811] [2022-11-03 02:32:21,200 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:32:21,200 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1949486292] [2022-11-03 02:32:21,200 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1949486292] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:32:21,200 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2041592712] [2022-11-03 02:32:21,202 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-03 02:32:21,202 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:32:21,202 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:32:21,203 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:32:21,203 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:32:27,609 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 50 for LOIs [2022-11-03 02:32:27,668 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-03 02:32:27,682 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:32:32,582 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4988#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:32:32,582 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:32:32,582 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 02:32:32,583 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 22 [2022-11-03 02:32:32,583 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [120424361] [2022-11-03 02:32:32,583 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 02:32:32,583 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-03 02:32:32,583 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:32:32,584 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-03 02:32:32,584 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=1432, Unknown=0, NotChecked=0, Total=1640 [2022-11-03 02:32:32,585 INFO L87 Difference]: Start difference. First operand 194 states and 262 transitions. Second operand has 22 states, 22 states have (on average 2.3181818181818183) internal successors, (51), 21 states have internal predecessors, (51), 5 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2022-11-03 02:32:44,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:32:44,296 INFO L93 Difference]: Finished difference Result 464 states and 653 transitions. [2022-11-03 02:32:44,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-11-03 02:32:44,297 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.3181818181818183) internal successors, (51), 21 states have internal predecessors, (51), 5 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) Word has length 59 [2022-11-03 02:32:44,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:32:44,299 INFO L225 Difference]: With dead ends: 464 [2022-11-03 02:32:44,300 INFO L226 Difference]: Without dead ends: 407 [2022-11-03 02:32:44,304 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 128 SyntacticMatches, 8 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1567 ImplicationChecksByTransitivity, 10.2s TimeCoverageRelationStatistics Valid=636, Invalid=4056, Unknown=0, NotChecked=0, Total=4692 [2022-11-03 02:32:44,305 INFO L413 NwaCegarLoop]: 79 mSDtfsCounter, 200 mSDsluCounter, 293 mSDsCounter, 0 mSdLazyCounter, 904 mSolverCounterSat, 315 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 200 SdHoareTripleChecker+Valid, 360 SdHoareTripleChecker+Invalid, 1219 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 315 IncrementalHoareTripleChecker+Valid, 904 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.8s IncrementalHoareTripleChecker+Time [2022-11-03 02:32:44,305 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [200 Valid, 360 Invalid, 1219 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [315 Valid, 904 Invalid, 0 Unknown, 0 Unchecked, 6.8s Time] [2022-11-03 02:32:44,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 407 states. [2022-11-03 02:32:44,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 407 to 283. [2022-11-03 02:32:44,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 283 states, 186 states have (on average 1.2150537634408602) internal successors, (226), 187 states have internal predecessors, (226), 81 states have call successors, (81), 15 states have call predecessors, (81), 15 states have return successors, (80), 80 states have call predecessors, (80), 80 states have call successors, (80) [2022-11-03 02:32:44,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 283 states to 283 states and 387 transitions. [2022-11-03 02:32:44,482 INFO L78 Accepts]: Start accepts. Automaton has 283 states and 387 transitions. Word has length 59 [2022-11-03 02:32:44,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:32:44,482 INFO L495 AbstractCegarLoop]: Abstraction has 283 states and 387 transitions. [2022-11-03 02:32:44,483 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.3181818181818183) internal successors, (51), 21 states have internal predecessors, (51), 5 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2022-11-03 02:32:44,483 INFO L276 IsEmpty]: Start isEmpty. Operand 283 states and 387 transitions. [2022-11-03 02:32:44,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-11-03 02:32:44,484 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:32:44,484 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 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] [2022-11-03 02:32:44,507 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-03 02:32:44,686 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:32:44,687 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:32:44,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:32:44,687 INFO L85 PathProgramCache]: Analyzing trace with hash -1223812978, now seen corresponding path program 3 times [2022-11-03 02:32:44,687 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:32:44,687 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [817778570] [2022-11-03 02:32:44,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:32:44,688 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:32:44,704 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:32:44,711 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [799566872] [2022-11-03 02:32:44,711 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:32:44,711 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:32:44,712 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:32:44,713 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:32:44,716 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-03 02:32:44,772 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:32:44,772 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:32:44,773 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-03 02:32:44,775 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:32:44,838 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 27 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-03 02:32:44,838 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:32:44,941 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 27 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-03 02:32:44,942 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:32:44,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [817778570] [2022-11-03 02:32:44,942 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:32:44,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [799566872] [2022-11-03 02:32:44,942 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [799566872] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:32:44,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1447670604] [2022-11-03 02:32:44,945 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-03 02:32:44,945 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:32:44,945 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:32:44,945 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:32:44,945 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:32:50,709 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 50 for LOIs [2022-11-03 02:32:50,762 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-03 02:32:50,776 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:32:53,073 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6578#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2022-11-03 02:32:53,073 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:32:53,073 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 02:32:53,073 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2022-11-03 02:32:53,073 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1954560726] [2022-11-03 02:32:53,074 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 02:32:53,074 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-03 02:32:53,074 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:32:53,075 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-03 02:32:53,075 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=798, Unknown=0, NotChecked=0, Total=930 [2022-11-03 02:32:53,075 INFO L87 Difference]: Start difference. First operand 283 states and 387 transitions. Second operand has 12 states, 12 states have (on average 3.4166666666666665) internal successors, (41), 12 states have internal predecessors, (41), 4 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2022-11-03 02:32:53,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:32:53,762 INFO L93 Difference]: Finished difference Result 389 states and 541 transitions. [2022-11-03 02:32:53,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-03 02:32:53,763 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.4166666666666665) internal successors, (41), 12 states have internal predecessors, (41), 4 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) Word has length 59 [2022-11-03 02:32:53,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:32:53,765 INFO L225 Difference]: With dead ends: 389 [2022-11-03 02:32:53,765 INFO L226 Difference]: Without dead ends: 297 [2022-11-03 02:32:53,767 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 144 SyntacticMatches, 6 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 640 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=244, Invalid=1562, Unknown=0, NotChecked=0, Total=1806 [2022-11-03 02:32:53,768 INFO L413 NwaCegarLoop]: 59 mSDtfsCounter, 42 mSDsluCounter, 170 mSDsCounter, 0 mSdLazyCounter, 324 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 221 SdHoareTripleChecker+Invalid, 384 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 324 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 02:32:53,769 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [46 Valid, 221 Invalid, 384 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 324 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 02:32:53,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 297 states. [2022-11-03 02:32:53,918 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 297 to 258. [2022-11-03 02:32:53,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 258 states, 169 states have (on average 1.1715976331360947) internal successors, (198), 170 states have internal predecessors, (198), 73 states have call successors, (73), 15 states have call predecessors, (73), 15 states have return successors, (72), 72 states have call predecessors, (72), 72 states have call successors, (72) [2022-11-03 02:32:53,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 258 states to 258 states and 343 transitions. [2022-11-03 02:32:53,920 INFO L78 Accepts]: Start accepts. Automaton has 258 states and 343 transitions. Word has length 59 [2022-11-03 02:32:53,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:32:53,921 INFO L495 AbstractCegarLoop]: Abstraction has 258 states and 343 transitions. [2022-11-03 02:32:53,921 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.4166666666666665) internal successors, (41), 12 states have internal predecessors, (41), 4 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2022-11-03 02:32:53,921 INFO L276 IsEmpty]: Start isEmpty. Operand 258 states and 343 transitions. [2022-11-03 02:32:53,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-11-03 02:32:53,922 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:32:53,922 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 4, 3, 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] [2022-11-03 02:32:53,945 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-03 02:32:54,124 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:32:54,124 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:32:54,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:32:54,125 INFO L85 PathProgramCache]: Analyzing trace with hash 255729376, now seen corresponding path program 4 times [2022-11-03 02:32:54,125 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:32:54,125 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2103088337] [2022-11-03 02:32:54,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:32:54,125 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:32:54,135 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:32:54,135 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [779760398] [2022-11-03 02:32:54,136 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:32:54,136 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:32:54,136 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:32:54,145 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:32:54,148 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-03 02:32:54,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:32:54,210 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-03 02:32:54,212 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:32:54,305 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 18 proven. 6 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2022-11-03 02:32:54,306 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:32:54,369 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 20 proven. 0 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2022-11-03 02:32:54,369 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:32:54,369 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2103088337] [2022-11-03 02:32:54,369 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:32:54,370 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [779760398] [2022-11-03 02:32:54,370 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [779760398] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-03 02:32:54,370 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 02:32:54,370 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 9 [2022-11-03 02:32:54,370 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [536509364] [2022-11-03 02:32:54,371 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:32:54,371 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-03 02:32:54,371 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:32:54,371 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-03 02:32:54,372 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2022-11-03 02:32:54,372 INFO L87 Difference]: Start difference. First operand 258 states and 343 transitions. Second operand has 5 states, 5 states have (on average 4.6) internal successors, (23), 4 states have internal predecessors, (23), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2022-11-03 02:32:54,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:32:54,658 INFO L93 Difference]: Finished difference Result 299 states and 408 transitions. [2022-11-03 02:32:54,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-03 02:32:54,658 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 4 states have internal predecessors, (23), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 64 [2022-11-03 02:32:54,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:32:54,661 INFO L225 Difference]: With dead ends: 299 [2022-11-03 02:32:54,661 INFO L226 Difference]: Without dead ends: 297 [2022-11-03 02:32:54,661 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 117 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2022-11-03 02:32:54,662 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 8 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:32:54,662 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 106 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:32:54,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 297 states. [2022-11-03 02:32:54,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 297 to 292. [2022-11-03 02:32:54,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 292 states, 182 states have (on average 1.1868131868131868) internal successors, (216), 183 states have internal predecessors, (216), 93 states have call successors, (93), 16 states have call predecessors, (93), 16 states have return successors, (92), 92 states have call predecessors, (92), 92 states have call successors, (92) [2022-11-03 02:32:54,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 401 transitions. [2022-11-03 02:32:54,871 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 401 transitions. Word has length 64 [2022-11-03 02:32:54,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:32:54,872 INFO L495 AbstractCegarLoop]: Abstraction has 292 states and 401 transitions. [2022-11-03 02:32:54,872 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 4 states have internal predecessors, (23), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2022-11-03 02:32:54,872 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 401 transitions. [2022-11-03 02:32:54,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-11-03 02:32:54,873 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:32:54,873 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 4, 4, 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] [2022-11-03 02:32:54,899 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-03 02:32:55,082 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-03 02:32:55,083 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:32:55,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:32:55,083 INFO L85 PathProgramCache]: Analyzing trace with hash 1508724982, now seen corresponding path program 5 times [2022-11-03 02:32:55,083 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:32:55,083 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [784304784] [2022-11-03 02:32:55,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:32:55,083 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:32:55,095 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:32:55,095 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [583696615] [2022-11-03 02:32:55,095 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:32:55,095 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:32:55,095 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:32:55,096 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:32:55,131 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-03 02:32:55,179 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-03 02:32:55,180 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:32:55,182 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 68 conjunts are in the unsatisfiable core [2022-11-03 02:32:55,184 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:32:55,961 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 21 proven. 23 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-11-03 02:32:55,961 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:33:03,310 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 21 proven. 23 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-11-03 02:33:03,310 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:33:03,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [784304784] [2022-11-03 02:33:03,311 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:33:03,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [583696615] [2022-11-03 02:33:03,311 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [583696615] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:33:03,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1458355997] [2022-11-03 02:33:03,313 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-03 02:33:03,313 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:33:03,314 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:33:03,314 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:33:03,314 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:33:11,084 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-03 02:33:11,089 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-03 02:33:11,101 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:33:18,779 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9331#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:33:18,780 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:33:18,780 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 02:33:18,780 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 27 [2022-11-03 02:33:18,780 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1099304624] [2022-11-03 02:33:18,780 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 02:33:18,781 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-11-03 02:33:18,781 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:33:18,781 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-11-03 02:33:18,782 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=217, Invalid=1852, Unknown=1, NotChecked=0, Total=2070 [2022-11-03 02:33:18,782 INFO L87 Difference]: Start difference. First operand 292 states and 401 transitions. Second operand has 27 states, 25 states have (on average 2.24) internal successors, (56), 24 states have internal predecessors, (56), 7 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2022-11-03 02:33:37,678 WARN L234 SmtUtils]: Spent 10.57s on a formula simplification. DAG size of input: 74 DAG size of output: 65 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-03 02:33:47,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:33:47,870 INFO L93 Difference]: Finished difference Result 391 states and 535 transitions. [2022-11-03 02:33:47,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-11-03 02:33:47,870 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 25 states have (on average 2.24) internal successors, (56), 24 states have internal predecessors, (56), 7 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) Word has length 64 [2022-11-03 02:33:47,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:33:47,873 INFO L225 Difference]: With dead ends: 391 [2022-11-03 02:33:47,873 INFO L226 Difference]: Without dead ends: 389 [2022-11-03 02:33:47,875 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 154 SyntacticMatches, 8 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1968 ImplicationChecksByTransitivity, 36.2s TimeCoverageRelationStatistics Valid=694, Invalid=5467, Unknown=1, NotChecked=0, Total=6162 [2022-11-03 02:33:47,876 INFO L413 NwaCegarLoop]: 41 mSDtfsCounter, 142 mSDsluCounter, 348 mSDsCounter, 0 mSdLazyCounter, 1143 mSolverCounterSat, 244 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 143 SdHoareTripleChecker+Valid, 369 SdHoareTripleChecker+Invalid, 1677 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 244 IncrementalHoareTripleChecker+Valid, 1143 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 290 IncrementalHoareTripleChecker+Unchecked, 5.7s IncrementalHoareTripleChecker+Time [2022-11-03 02:33:47,876 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [143 Valid, 369 Invalid, 1677 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [244 Valid, 1143 Invalid, 0 Unknown, 290 Unchecked, 5.7s Time] [2022-11-03 02:33:47,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 389 states. [2022-11-03 02:33:48,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 389 to 375. [2022-11-03 02:33:48,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 375 states, 235 states have (on average 1.1787234042553192) internal successors, (277), 238 states have internal predecessors, (277), 117 states have call successors, (117), 22 states have call predecessors, (117), 22 states have return successors, (116), 114 states have call predecessors, (116), 116 states have call successors, (116) [2022-11-03 02:33:48,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 375 states to 375 states and 510 transitions. [2022-11-03 02:33:48,166 INFO L78 Accepts]: Start accepts. Automaton has 375 states and 510 transitions. Word has length 64 [2022-11-03 02:33:48,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:33:48,167 INFO L495 AbstractCegarLoop]: Abstraction has 375 states and 510 transitions. [2022-11-03 02:33:48,167 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 25 states have (on average 2.24) internal successors, (56), 24 states have internal predecessors, (56), 7 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2022-11-03 02:33:48,167 INFO L276 IsEmpty]: Start isEmpty. Operand 375 states and 510 transitions. [2022-11-03 02:33:48,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2022-11-03 02:33:48,169 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:33:48,169 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:33:48,191 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-11-03 02:33:48,372 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:33:48,373 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:33:48,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:33:48,373 INFO L85 PathProgramCache]: Analyzing trace with hash 1897496259, now seen corresponding path program 1 times [2022-11-03 02:33:48,373 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:33:48,373 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [392081574] [2022-11-03 02:33:48,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:33:48,373 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:33:48,384 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:33:48,384 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [560024984] [2022-11-03 02:33:48,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:33:48,385 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:33:48,385 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:33:48,386 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:33:48,403 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-03 02:33:48,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:33:48,457 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 85 conjunts are in the unsatisfiable core [2022-11-03 02:33:48,460 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:33:49,281 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 51 proven. 32 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2022-11-03 02:33:49,282 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:33:50,811 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 61 proven. 17 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2022-11-03 02:33:50,811 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:33:50,811 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [392081574] [2022-11-03 02:33:50,811 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:33:50,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [560024984] [2022-11-03 02:33:50,812 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [560024984] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:33:50,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [363898906] [2022-11-03 02:33:50,814 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-03 02:33:50,814 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:33:50,815 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:33:50,815 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:33:50,815 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:33:56,829 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-03 02:33:56,833 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-03 02:33:56,846 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:34:23,217 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11116#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:34:23,217 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:34:23,217 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 02:34:23,217 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 15] total 27 [2022-11-03 02:34:23,217 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1555465083] [2022-11-03 02:34:23,217 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 02:34:23,218 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-11-03 02:34:23,218 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:34:23,219 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-11-03 02:34:23,219 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=1704, Unknown=0, NotChecked=0, Total=1892 [2022-11-03 02:34:23,220 INFO L87 Difference]: Start difference. First operand 375 states and 510 transitions. Second operand has 27 states, 22 states have (on average 2.409090909090909) internal successors, (53), 23 states have internal predecessors, (53), 11 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (20), 8 states have call predecessors, (20), 9 states have call successors, (20) [2022-11-03 02:34:24,807 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.30s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [] [2022-11-03 02:34:35,923 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:34:38,430 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:34:41,958 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.50s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:34:45,593 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:34:51,185 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.17s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:34:57,884 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.31s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:35:01,112 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:35:08,444 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.21s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:35:11,703 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:35:16,839 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:35:23,268 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:35:25,794 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:35:28,763 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.40s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:35:30,766 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:35:33,928 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.11s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:35:42,421 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:35:44,426 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:35:46,425 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.89s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:35:48,427 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:35:52,518 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:35:53,842 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.13s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:35:55,454 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.61s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:35:57,274 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.69s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:36:01,181 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:36:03,468 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:36:07,009 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:36:09,013 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:36:09,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:36:09,049 INFO L93 Difference]: Finished difference Result 567 states and 800 transitions. [2022-11-03 02:36:09,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2022-11-03 02:36:09,052 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 22 states have (on average 2.409090909090909) internal successors, (53), 23 states have internal predecessors, (53), 11 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (20), 8 states have call predecessors, (20), 9 states have call successors, (20) Word has length 78 [2022-11-03 02:36:09,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:36:09,055 INFO L225 Difference]: With dead ends: 567 [2022-11-03 02:36:09,055 INFO L226 Difference]: Without dead ends: 563 [2022-11-03 02:36:09,058 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 303 GetRequests, 195 SyntacticMatches, 10 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3355 ImplicationChecksByTransitivity, 51.2s TimeCoverageRelationStatistics Valid=1205, Invalid=8695, Unknown=0, NotChecked=0, Total=9900 [2022-11-03 02:36:09,059 INFO L413 NwaCegarLoop]: 58 mSDtfsCounter, 190 mSDsluCounter, 356 mSDsCounter, 0 mSdLazyCounter, 2078 mSolverCounterSat, 452 mSolverCounterUnsat, 17 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 81.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 193 SdHoareTripleChecker+Valid, 396 SdHoareTripleChecker+Invalid, 2547 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 452 IncrementalHoareTripleChecker+Valid, 2078 IncrementalHoareTripleChecker+Invalid, 17 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 81.4s IncrementalHoareTripleChecker+Time [2022-11-03 02:36:09,059 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [193 Valid, 396 Invalid, 2547 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [452 Valid, 2078 Invalid, 17 Unknown, 0 Unchecked, 81.4s Time] [2022-11-03 02:36:09,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 563 states. [2022-11-03 02:36:09,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 563 to 472. [2022-11-03 02:36:09,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 472 states, 299 states have (on average 1.1839464882943145) internal successors, (354), 302 states have internal predecessors, (354), 145 states have call successors, (145), 27 states have call predecessors, (145), 27 states have return successors, (144), 142 states have call predecessors, (144), 144 states have call successors, (144) [2022-11-03 02:36:09,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 472 states to 472 states and 643 transitions. [2022-11-03 02:36:09,459 INFO L78 Accepts]: Start accepts. Automaton has 472 states and 643 transitions. Word has length 78 [2022-11-03 02:36:09,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:36:09,460 INFO L495 AbstractCegarLoop]: Abstraction has 472 states and 643 transitions. [2022-11-03 02:36:09,460 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 22 states have (on average 2.409090909090909) internal successors, (53), 23 states have internal predecessors, (53), 11 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (20), 8 states have call predecessors, (20), 9 states have call successors, (20) [2022-11-03 02:36:09,460 INFO L276 IsEmpty]: Start isEmpty. Operand 472 states and 643 transitions. [2022-11-03 02:36:09,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2022-11-03 02:36:09,462 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:36:09,462 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:36:09,490 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2022-11-03 02:36:09,676 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-03 02:36:09,677 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:36:09,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:36:09,677 INFO L85 PathProgramCache]: Analyzing trace with hash -1729932497, now seen corresponding path program 1 times [2022-11-03 02:36:09,677 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:36:09,677 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1466630712] [2022-11-03 02:36:09,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:36:09,677 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:36:09,687 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:36:09,687 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [57412943] [2022-11-03 02:36:09,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:36:09,688 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:36:09,688 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:36:09,689 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:36:09,699 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-03 02:36:09,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:36:09,748 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 27 conjunts are in the unsatisfiable core [2022-11-03 02:36:09,750 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:36:10,143 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 20 proven. 19 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2022-11-03 02:36:10,143 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:36:10,776 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 20 proven. 16 refuted. 0 times theorem prover too weak. 192 trivial. 0 not checked. [2022-11-03 02:36:10,777 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:36:10,777 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1466630712] [2022-11-03 02:36:10,777 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:36:10,777 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [57412943] [2022-11-03 02:36:10,777 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [57412943] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:36:10,778 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1957869568] [2022-11-03 02:36:10,779 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-03 02:36:10,780 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:36:10,780 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:36:10,780 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:36:10,780 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:36:13,815 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2022-11-03 02:36:13,853 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-03 02:36:13,865 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:36:16,789 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13382#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:36:16,789 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:36:16,789 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 02:36:16,789 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10] total 19 [2022-11-03 02:36:16,789 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1475371577] [2022-11-03 02:36:16,789 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 02:36:16,790 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-03 02:36:16,790 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:36:16,790 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-03 02:36:16,791 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=1096, Unknown=0, NotChecked=0, Total=1260 [2022-11-03 02:36:16,791 INFO L87 Difference]: Start difference. First operand 472 states and 643 transitions. Second operand has 19 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 18 states have internal predecessors, (37), 8 states have call successors, (29), 2 states have call predecessors, (29), 2 states have return successors, (28), 8 states have call predecessors, (28), 8 states have call successors, (28) [2022-11-03 02:36:21,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:36:21,178 INFO L93 Difference]: Finished difference Result 817 states and 1204 transitions. [2022-11-03 02:36:21,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-11-03 02:36:21,178 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 18 states have internal predecessors, (37), 8 states have call successors, (29), 2 states have call predecessors, (29), 2 states have return successors, (28), 8 states have call predecessors, (28), 8 states have call successors, (28) Word has length 81 [2022-11-03 02:36:21,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:36:21,183 INFO L225 Difference]: With dead ends: 817 [2022-11-03 02:36:21,183 INFO L226 Difference]: Without dead ends: 815 [2022-11-03 02:36:21,185 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 280 GetRequests, 206 SyntacticMatches, 13 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1611 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=568, Invalid=3338, Unknown=0, NotChecked=0, Total=3906 [2022-11-03 02:36:21,185 INFO L413 NwaCegarLoop]: 86 mSDtfsCounter, 108 mSDsluCounter, 437 mSDsCounter, 0 mSdLazyCounter, 675 mSolverCounterSat, 150 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 510 SdHoareTripleChecker+Invalid, 965 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 150 IncrementalHoareTripleChecker+Valid, 675 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 140 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:36:21,186 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [114 Valid, 510 Invalid, 965 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [150 Valid, 675 Invalid, 0 Unknown, 140 Unchecked, 2.0s Time] [2022-11-03 02:36:21,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 815 states. [2022-11-03 02:36:22,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 815 to 773. [2022-11-03 02:36:22,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 773 states, 432 states have (on average 1.2523148148148149) internal successors, (541), 435 states have internal predecessors, (541), 309 states have call successors, (309), 31 states have call predecessors, (309), 31 states have return successors, (308), 306 states have call predecessors, (308), 308 states have call successors, (308) [2022-11-03 02:36:22,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 773 states to 773 states and 1158 transitions. [2022-11-03 02:36:22,103 INFO L78 Accepts]: Start accepts. Automaton has 773 states and 1158 transitions. Word has length 81 [2022-11-03 02:36:22,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:36:22,104 INFO L495 AbstractCegarLoop]: Abstraction has 773 states and 1158 transitions. [2022-11-03 02:36:22,104 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 18 states have internal predecessors, (37), 8 states have call successors, (29), 2 states have call predecessors, (29), 2 states have return successors, (28), 8 states have call predecessors, (28), 8 states have call successors, (28) [2022-11-03 02:36:22,104 INFO L276 IsEmpty]: Start isEmpty. Operand 773 states and 1158 transitions. [2022-11-03 02:36:22,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2022-11-03 02:36:22,109 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:36:22,109 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 5, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:36:22,148 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-03 02:36:22,332 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-03 02:36:22,332 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:36:22,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:36:22,333 INFO L85 PathProgramCache]: Analyzing trace with hash 646028470, now seen corresponding path program 6 times [2022-11-03 02:36:22,333 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:36:22,333 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [457875707] [2022-11-03 02:36:22,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:36:22,333 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:36:22,354 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:36:22,367 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [260428221] [2022-11-03 02:36:22,367 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:36:22,367 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:36:22,367 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:36:22,368 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:36:22,392 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-03 02:36:22,444 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:36:22,444 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:36:22,446 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-03 02:36:22,448 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:36:24,784 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 34 proven. 44 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2022-11-03 02:36:24,785 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:36:25,885 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 55 proven. 9 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2022-11-03 02:36:25,885 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:36:25,886 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [457875707] [2022-11-03 02:36:25,886 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:36:25,886 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [260428221] [2022-11-03 02:36:25,886 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [260428221] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:36:25,886 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2068645192] [2022-11-03 02:36:25,888 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-03 02:36:25,888 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:36:25,889 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:36:25,889 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:36:25,889 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:36:30,726 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 50 for LOIs [2022-11-03 02:36:30,784 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-03 02:36:30,797 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:36:35,185 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16550#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2022-11-03 02:36:35,188 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:36:35,188 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 02:36:35,188 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 9] total 23 [2022-11-03 02:36:35,188 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1263414273] [2022-11-03 02:36:35,189 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 02:36:35,189 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-11-03 02:36:35,189 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:36:35,189 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-11-03 02:36:35,190 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=178, Invalid=1544, Unknown=0, NotChecked=0, Total=1722 [2022-11-03 02:36:35,190 INFO L87 Difference]: Start difference. First operand 773 states and 1158 transitions. Second operand has 23 states, 22 states have (on average 2.772727272727273) internal successors, (61), 19 states have internal predecessors, (61), 8 states have call successors, (21), 2 states have call predecessors, (21), 3 states have return successors, (21), 6 states have call predecessors, (21), 6 states have call successors, (21) [2022-11-03 02:37:00,648 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:37:08,417 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.80s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:37:15,442 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.46s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:37:16,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:37:16,101 INFO L93 Difference]: Finished difference Result 866 states and 1297 transitions. [2022-11-03 02:37:16,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-11-03 02:37:16,102 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 2.772727272727273) internal successors, (61), 19 states have internal predecessors, (61), 8 states have call successors, (21), 2 states have call predecessors, (21), 3 states have return successors, (21), 6 states have call predecessors, (21), 6 states have call successors, (21) Word has length 84 [2022-11-03 02:37:16,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:37:16,107 INFO L225 Difference]: With dead ends: 866 [2022-11-03 02:37:16,107 INFO L226 Difference]: Without dead ends: 864 [2022-11-03 02:37:16,109 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 204 SyntacticMatches, 13 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1519 ImplicationChecksByTransitivity, 26.8s TimeCoverageRelationStatistics Valid=372, Invalid=3168, Unknown=0, NotChecked=0, Total=3540 [2022-11-03 02:37:16,109 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 118 mSDsluCounter, 261 mSDsCounter, 0 mSdLazyCounter, 1025 mSolverCounterSat, 182 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 19.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 120 SdHoareTripleChecker+Valid, 294 SdHoareTripleChecker+Invalid, 1208 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 182 IncrementalHoareTripleChecker+Valid, 1025 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19.3s IncrementalHoareTripleChecker+Time [2022-11-03 02:37:16,110 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [120 Valid, 294 Invalid, 1208 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [182 Valid, 1025 Invalid, 1 Unknown, 0 Unchecked, 19.3s Time] [2022-11-03 02:37:16,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 864 states. [2022-11-03 02:37:17,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 864 to 785. [2022-11-03 02:37:17,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 785 states, 441 states have (on average 1.2471655328798186) internal successors, (550), 444 states have internal predecessors, (550), 309 states have call successors, (309), 34 states have call predecessors, (309), 34 states have return successors, (308), 306 states have call predecessors, (308), 308 states have call successors, (308) [2022-11-03 02:37:17,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 785 states to 785 states and 1167 transitions. [2022-11-03 02:37:17,082 INFO L78 Accepts]: Start accepts. Automaton has 785 states and 1167 transitions. Word has length 84 [2022-11-03 02:37:17,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:37:17,082 INFO L495 AbstractCegarLoop]: Abstraction has 785 states and 1167 transitions. [2022-11-03 02:37:17,082 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 2.772727272727273) internal successors, (61), 19 states have internal predecessors, (61), 8 states have call successors, (21), 2 states have call predecessors, (21), 3 states have return successors, (21), 6 states have call predecessors, (21), 6 states have call successors, (21) [2022-11-03 02:37:17,083 INFO L276 IsEmpty]: Start isEmpty. Operand 785 states and 1167 transitions. [2022-11-03 02:37:17,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2022-11-03 02:37:17,084 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:37:17,084 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 5, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:37:17,119 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-03 02:37:17,300 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-03 02:37:17,300 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:37:17,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:37:17,301 INFO L85 PathProgramCache]: Analyzing trace with hash 1618080332, now seen corresponding path program 2 times [2022-11-03 02:37:17,301 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:37:17,301 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [332085362] [2022-11-03 02:37:17,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:37:17,301 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:37:17,322 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:37:17,324 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1422998265] [2022-11-03 02:37:17,325 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:37:17,325 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:37:17,325 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:37:17,326 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:37:17,351 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-03 02:37:17,391 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-03 02:37:17,391 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:37:17,392 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-03 02:37:17,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:37:17,473 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 45 proven. 5 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2022-11-03 02:37:17,473 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:37:17,581 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 45 proven. 5 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2022-11-03 02:37:17,581 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:37:17,581 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [332085362] [2022-11-03 02:37:17,581 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:37:17,581 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1422998265] [2022-11-03 02:37:17,581 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1422998265] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:37:17,581 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1314252219] [2022-11-03 02:37:17,583 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-03 02:37:17,583 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:37:17,583 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:37:17,584 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:37:17,584 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:37:24,990 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-03 02:37:24,994 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-03 02:37:25,007 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:37:27,525 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19806#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:37:27,525 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:37:27,525 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 02:37:27,526 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2022-11-03 02:37:27,526 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [219479020] [2022-11-03 02:37:27,526 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 02:37:27,526 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-03 02:37:27,526 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:37:27,527 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-03 02:37:27,527 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=645, Unknown=0, NotChecked=0, Total=756 [2022-11-03 02:37:27,527 INFO L87 Difference]: Start difference. First operand 785 states and 1167 transitions. Second operand has 8 states, 8 states have (on average 4.125) internal successors, (33), 8 states have internal predecessors, (33), 3 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2022-11-03 02:37:29,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:37:29,040 INFO L93 Difference]: Finished difference Result 914 states and 1356 transitions. [2022-11-03 02:37:29,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-03 02:37:29,041 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.125) internal successors, (33), 8 states have internal predecessors, (33), 3 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) Word has length 86 [2022-11-03 02:37:29,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:37:29,046 INFO L225 Difference]: With dead ends: 914 [2022-11-03 02:37:29,046 INFO L226 Difference]: Without dead ends: 907 [2022-11-03 02:37:29,047 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 270 GetRequests, 227 SyntacticMatches, 6 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 342 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=191, Invalid=1291, Unknown=0, NotChecked=0, Total=1482 [2022-11-03 02:37:29,048 INFO L413 NwaCegarLoop]: 72 mSDtfsCounter, 47 mSDsluCounter, 184 mSDsCounter, 0 mSdLazyCounter, 259 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 250 SdHoareTripleChecker+Invalid, 334 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 259 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:37:29,049 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [51 Valid, 250 Invalid, 334 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 259 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 02:37:29,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 907 states. [2022-11-03 02:37:29,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 907 to 757. [2022-11-03 02:37:29,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 757 states, 421 states have (on average 1.2494061757719714) internal successors, (526), 424 states have internal predecessors, (526), 301 states have call successors, (301), 34 states have call predecessors, (301), 34 states have return successors, (300), 298 states have call predecessors, (300), 300 states have call successors, (300) [2022-11-03 02:37:29,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 757 states to 757 states and 1127 transitions. [2022-11-03 02:37:29,859 INFO L78 Accepts]: Start accepts. Automaton has 757 states and 1127 transitions. Word has length 86 [2022-11-03 02:37:29,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:37:29,859 INFO L495 AbstractCegarLoop]: Abstraction has 757 states and 1127 transitions. [2022-11-03 02:37:29,859 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.125) internal successors, (33), 8 states have internal predecessors, (33), 3 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2022-11-03 02:37:29,859 INFO L276 IsEmpty]: Start isEmpty. Operand 757 states and 1127 transitions. [2022-11-03 02:37:29,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2022-11-03 02:37:29,861 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:37:29,861 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 5, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:37:29,900 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2022-11-03 02:37:30,076 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-03 02:37:30,076 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:37:30,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:37:30,077 INFO L85 PathProgramCache]: Analyzing trace with hash 1130039098, now seen corresponding path program 7 times [2022-11-03 02:37:30,077 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:37:30,077 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [952300332] [2022-11-03 02:37:30,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:37:30,077 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:37:30,086 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:37:30,086 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [433549794] [2022-11-03 02:37:30,086 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:37:30,086 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:37:30,087 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:37:30,088 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:37:30,089 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-03 02:37:30,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:37:30,161 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 87 conjunts are in the unsatisfiable core [2022-11-03 02:37:30,163 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:37:31,160 INFO L134 CoverageAnalysis]: Checked inductivity of 214 backedges. 47 proven. 71 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2022-11-03 02:37:31,160 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:37:31,867 INFO L134 CoverageAnalysis]: Checked inductivity of 214 backedges. 78 proven. 18 refuted. 0 times theorem prover too weak. 118 trivial. 0 not checked. [2022-11-03 02:37:31,868 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:37:31,868 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [952300332] [2022-11-03 02:37:31,868 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:37:31,868 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [433549794] [2022-11-03 02:37:31,868 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [433549794] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:37:31,868 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1894427436] [2022-11-03 02:37:31,870 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-03 02:37:31,870 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:37:31,870 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:37:31,871 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:37:31,871 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:37:37,327 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 50 for LOIs [2022-11-03 02:37:37,374 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-03 02:37:37,387 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:37:46,049 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23107#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2022-11-03 02:37:46,050 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:37:46,050 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 02:37:46,050 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 12] total 26 [2022-11-03 02:37:46,050 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [859606785] [2022-11-03 02:37:46,050 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 02:37:46,050 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-03 02:37:46,051 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:37:46,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-03 02:37:46,052 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=1772, Unknown=0, NotChecked=0, Total=1980 [2022-11-03 02:37:46,052 INFO L87 Difference]: Start difference. First operand 757 states and 1127 transitions. Second operand has 26 states, 23 states have (on average 2.782608695652174) internal successors, (64), 22 states have internal predecessors, (64), 12 states have call successors, (24), 2 states have call predecessors, (24), 2 states have return successors, (22), 7 states have call predecessors, (22), 10 states have call successors, (22) [2022-11-03 02:37:50,388 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:37:59,071 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:37:59,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:37:59,702 INFO L93 Difference]: Finished difference Result 875 states and 1287 transitions. [2022-11-03 02:37:59,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-03 02:37:59,703 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 23 states have (on average 2.782608695652174) internal successors, (64), 22 states have internal predecessors, (64), 12 states have call successors, (24), 2 states have call predecessors, (24), 2 states have return successors, (22), 7 states have call predecessors, (22), 10 states have call successors, (22) Word has length 89 [2022-11-03 02:37:59,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:37:59,708 INFO L225 Difference]: With dead ends: 875 [2022-11-03 02:37:59,708 INFO L226 Difference]: Without dead ends: 873 [2022-11-03 02:37:59,709 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 214 SyntacticMatches, 14 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1593 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=449, Invalid=3583, Unknown=0, NotChecked=0, Total=4032 [2022-11-03 02:37:59,710 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 117 mSDsluCounter, 253 mSDsCounter, 0 mSdLazyCounter, 1030 mSolverCounterSat, 243 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 117 SdHoareTripleChecker+Valid, 276 SdHoareTripleChecker+Invalid, 1275 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 243 IncrementalHoareTripleChecker+Valid, 1030 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:37:59,710 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [117 Valid, 276 Invalid, 1275 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [243 Valid, 1030 Invalid, 2 Unknown, 0 Unchecked, 11.2s Time] [2022-11-03 02:37:59,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 873 states. [2022-11-03 02:38:00,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 873 to 859. [2022-11-03 02:38:00,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 859 states, 480 states have (on average 1.2458333333333333) internal successors, (598), 483 states have internal predecessors, (598), 337 states have call successors, (337), 41 states have call predecessors, (337), 41 states have return successors, (336), 334 states have call predecessors, (336), 336 states have call successors, (336) [2022-11-03 02:38:00,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 859 states to 859 states and 1271 transitions. [2022-11-03 02:38:00,820 INFO L78 Accepts]: Start accepts. Automaton has 859 states and 1271 transitions. Word has length 89 [2022-11-03 02:38:00,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:38:00,820 INFO L495 AbstractCegarLoop]: Abstraction has 859 states and 1271 transitions. [2022-11-03 02:38:00,820 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 23 states have (on average 2.782608695652174) internal successors, (64), 22 states have internal predecessors, (64), 12 states have call successors, (24), 2 states have call predecessors, (24), 2 states have return successors, (22), 7 states have call predecessors, (22), 10 states have call successors, (22) [2022-11-03 02:38:00,821 INFO L276 IsEmpty]: Start isEmpty. Operand 859 states and 1271 transitions. [2022-11-03 02:38:00,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2022-11-03 02:38:00,823 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:38:00,823 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:38:00,858 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2022-11-03 02:38:01,048 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-03 02:38:01,049 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:38:01,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:38:01,049 INFO L85 PathProgramCache]: Analyzing trace with hash 355863159, now seen corresponding path program 2 times [2022-11-03 02:38:01,049 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:38:01,049 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1931737589] [2022-11-03 02:38:01,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:38:01,049 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:38:01,057 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:38:01,058 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1616192134] [2022-11-03 02:38:01,058 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:38:01,058 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:38:01,058 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:38:01,059 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:38:01,066 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-03 02:38:01,132 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-03 02:38:01,132 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:38:01,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 67 conjunts are in the unsatisfiable core [2022-11-03 02:38:01,137 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:38:04,508 INFO L134 CoverageAnalysis]: Checked inductivity of 327 backedges. 44 proven. 43 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2022-11-03 02:38:04,509 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:38:07,592 INFO L134 CoverageAnalysis]: Checked inductivity of 327 backedges. 44 proven. 40 refuted. 0 times theorem prover too weak. 243 trivial. 0 not checked. [2022-11-03 02:38:07,592 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:38:07,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1931737589] [2022-11-03 02:38:07,592 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:38:07,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1616192134] [2022-11-03 02:38:07,592 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1616192134] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:38:07,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1806666264] [2022-11-03 02:38:07,594 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-03 02:38:07,594 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:38:07,595 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:38:07,595 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:38:07,595 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:38:13,405 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-03 02:38:13,408 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-03 02:38:13,421 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:38:27,334 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26579#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:38:27,335 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:38:27,335 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 02:38:27,335 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 32 [2022-11-03 02:38:27,335 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1214083707] [2022-11-03 02:38:27,335 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 02:38:27,336 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-03 02:38:27,336 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:38:27,336 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-03 02:38:27,337 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=267, Invalid=2085, Unknown=0, NotChecked=0, Total=2352 [2022-11-03 02:38:27,338 INFO L87 Difference]: Start difference. First operand 859 states and 1271 transitions. Second operand has 32 states, 29 states have (on average 1.9310344827586208) internal successors, (56), 29 states have internal predecessors, (56), 10 states have call successors, (33), 2 states have call predecessors, (33), 3 states have return successors, (32), 10 states have call predecessors, (32), 8 states have call successors, (32) [2022-11-03 02:39:20,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:39:20,655 INFO L93 Difference]: Finished difference Result 1251 states and 1859 transitions. [2022-11-03 02:39:20,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2022-11-03 02:39:20,657 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 29 states have (on average 1.9310344827586208) internal successors, (56), 29 states have internal predecessors, (56), 10 states have call successors, (33), 2 states have call predecessors, (33), 3 states have return successors, (32), 10 states have call predecessors, (32), 8 states have call successors, (32) Word has length 98 [2022-11-03 02:39:20,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:39:20,662 INFO L225 Difference]: With dead ends: 1251 [2022-11-03 02:39:20,662 INFO L226 Difference]: Without dead ends: 973 [2022-11-03 02:39:20,666 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 220 SyntacticMatches, 25 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4739 ImplicationChecksByTransitivity, 49.7s TimeCoverageRelationStatistics Valid=1864, Invalid=9266, Unknown=0, NotChecked=0, Total=11130 [2022-11-03 02:39:20,666 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 211 mSDsluCounter, 232 mSDsCounter, 0 mSdLazyCounter, 1810 mSolverCounterSat, 471 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 211 SdHoareTripleChecker+Valid, 240 SdHoareTripleChecker+Invalid, 2281 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 471 IncrementalHoareTripleChecker+Valid, 1810 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:39:20,667 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [211 Valid, 240 Invalid, 2281 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [471 Valid, 1810 Invalid, 0 Unknown, 0 Unchecked, 19.1s Time] [2022-11-03 02:39:20,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 973 states. [2022-11-03 02:39:21,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 973 to 870. [2022-11-03 02:39:21,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 870 states, 487 states have (on average 1.242299794661191) internal successors, (605), 490 states have internal predecessors, (605), 341 states have call successors, (341), 41 states have call predecessors, (341), 41 states have return successors, (340), 338 states have call predecessors, (340), 340 states have call successors, (340) [2022-11-03 02:39:21,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 870 states to 870 states and 1286 transitions. [2022-11-03 02:39:21,889 INFO L78 Accepts]: Start accepts. Automaton has 870 states and 1286 transitions. Word has length 98 [2022-11-03 02:39:21,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:39:21,890 INFO L495 AbstractCegarLoop]: Abstraction has 870 states and 1286 transitions. [2022-11-03 02:39:21,890 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 29 states have (on average 1.9310344827586208) internal successors, (56), 29 states have internal predecessors, (56), 10 states have call successors, (33), 2 states have call predecessors, (33), 3 states have return successors, (32), 10 states have call predecessors, (32), 8 states have call successors, (32) [2022-11-03 02:39:21,890 INFO L276 IsEmpty]: Start isEmpty. Operand 870 states and 1286 transitions. [2022-11-03 02:39:21,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2022-11-03 02:39:21,891 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:39:21,891 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:39:21,913 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-03 02:39:22,091 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:39:22,092 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:39:22,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:39:22,092 INFO L85 PathProgramCache]: Analyzing trace with hash -327458570, now seen corresponding path program 1 times [2022-11-03 02:39:22,092 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:39:22,092 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [276427196] [2022-11-03 02:39:22,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:39:22,092 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:39:22,102 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:39:22,102 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [289993664] [2022-11-03 02:39:22,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:39:22,103 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:39:22,103 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:39:22,104 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:39:22,116 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-03 02:39:22,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:39:22,175 INFO L263 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-03 02:39:22,177 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:39:22,722 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 29 proven. 40 refuted. 0 times theorem prover too weak. 373 trivial. 0 not checked. [2022-11-03 02:39:22,723 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:39:24,295 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 29 proven. 40 refuted. 0 times theorem prover too weak. 373 trivial. 0 not checked. [2022-11-03 02:39:24,296 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:39:24,296 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [276427196] [2022-11-03 02:39:24,296 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:39:24,296 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [289993664] [2022-11-03 02:39:24,296 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [289993664] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:39:24,296 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1647181929] [2022-11-03 02:39:24,298 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-03 02:39:24,298 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:39:24,298 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:39:24,299 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:39:24,299 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:39:29,956 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2022-11-03 02:39:29,997 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-03 02:39:30,010 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:39:33,679 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30806#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:39:33,679 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:39:33,680 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 02:39:33,680 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 16] total 26 [2022-11-03 02:39:33,680 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2043709832] [2022-11-03 02:39:33,680 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 02:39:33,681 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-03 02:39:33,681 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:39:33,681 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-03 02:39:33,682 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=1539, Unknown=0, NotChecked=0, Total=1722 [2022-11-03 02:39:33,682 INFO L87 Difference]: Start difference. First operand 870 states and 1286 transitions. Second operand has 26 states, 25 states have (on average 2.0) internal successors, (50), 23 states have internal predecessors, (50), 11 states have call successors, (36), 2 states have call predecessors, (36), 2 states have return successors, (35), 11 states have call predecessors, (35), 11 states have call successors, (35) [2022-11-03 02:39:50,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:39:50,447 INFO L93 Difference]: Finished difference Result 1514 states and 2337 transitions. [2022-11-03 02:39:50,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-11-03 02:39:50,448 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.0) internal successors, (50), 23 states have internal predecessors, (50), 11 states have call successors, (36), 2 states have call predecessors, (36), 2 states have return successors, (35), 11 states have call predecessors, (35), 11 states have call successors, (35) Word has length 108 [2022-11-03 02:39:50,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:39:50,453 INFO L225 Difference]: With dead ends: 1514 [2022-11-03 02:39:50,453 INFO L226 Difference]: Without dead ends: 1512 [2022-11-03 02:39:50,455 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 357 GetRequests, 259 SyntacticMatches, 23 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2374 ImplicationChecksByTransitivity, 14.0s TimeCoverageRelationStatistics Valid=990, Invalid=4862, Unknown=0, NotChecked=0, Total=5852 [2022-11-03 02:39:50,455 INFO L413 NwaCegarLoop]: 93 mSDtfsCounter, 206 mSDsluCounter, 434 mSDsCounter, 0 mSdLazyCounter, 1184 mSolverCounterSat, 550 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 206 SdHoareTripleChecker+Valid, 511 SdHoareTripleChecker+Invalid, 1734 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 550 IncrementalHoareTripleChecker+Valid, 1184 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.9s IncrementalHoareTripleChecker+Time [2022-11-03 02:39:50,456 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [206 Valid, 511 Invalid, 1734 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [550 Valid, 1184 Invalid, 0 Unknown, 0 Unchecked, 4.9s Time] [2022-11-03 02:39:50,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1512 states. [2022-11-03 02:39:52,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1512 to 1423. [2022-11-03 02:39:52,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1423 states, 725 states have (on average 1.2979310344827586) internal successors, (941), 728 states have internal predecessors, (941), 649 states have call successors, (649), 48 states have call predecessors, (649), 48 states have return successors, (648), 646 states have call predecessors, (648), 648 states have call successors, (648) [2022-11-03 02:39:52,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1423 states to 1423 states and 2238 transitions. [2022-11-03 02:39:52,852 INFO L78 Accepts]: Start accepts. Automaton has 1423 states and 2238 transitions. Word has length 108 [2022-11-03 02:39:52,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:39:52,852 INFO L495 AbstractCegarLoop]: Abstraction has 1423 states and 2238 transitions. [2022-11-03 02:39:52,852 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 2.0) internal successors, (50), 23 states have internal predecessors, (50), 11 states have call successors, (36), 2 states have call predecessors, (36), 2 states have return successors, (35), 11 states have call predecessors, (35), 11 states have call successors, (35) [2022-11-03 02:39:52,853 INFO L276 IsEmpty]: Start isEmpty. Operand 1423 states and 2238 transitions. [2022-11-03 02:39:52,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2022-11-03 02:39:52,856 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:39:52,856 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:39:52,891 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-03 02:39:53,084 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:39:53,084 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:39:53,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:39:53,085 INFO L85 PathProgramCache]: Analyzing trace with hash -1702861936, now seen corresponding path program 3 times [2022-11-03 02:39:53,085 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:39:53,085 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2106723810] [2022-11-03 02:39:53,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:39:53,085 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:39:53,104 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:39:53,104 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [162548530] [2022-11-03 02:39:53,104 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:39:53,105 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:39:53,105 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:39:53,106 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:39:53,108 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-03 02:39:53,179 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:39:53,179 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:39:53,182 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 93 conjunts are in the unsatisfiable core [2022-11-03 02:39:53,186 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:40:06,081 INFO L134 CoverageAnalysis]: Checked inductivity of 580 backedges. 91 proven. 141 refuted. 0 times theorem prover too weak. 348 trivial. 0 not checked. [2022-11-03 02:40:06,081 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:40:16,268 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:40:16,269 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2106723810] [2022-11-03 02:40:16,269 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:40:16,269 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [162548530] [2022-11-03 02:40:16,269 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [162548530] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:40:16,269 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1892201597] [2022-11-03 02:40:16,271 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-03 02:40:16,271 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:40:16,271 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:40:16,271 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:40:16,271 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:40:21,942 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-03 02:40:21,945 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-03 02:40:21,971 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:41:01,901 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '36393#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:41:01,901 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:41:01,901 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-03 02:41:01,901 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2022-11-03 02:41:01,902 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1023218035] [2022-11-03 02:41:01,902 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-03 02:41:01,902 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-11-03 02:41:01,902 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:41:01,903 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-11-03 02:41:01,903 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=211, Invalid=2138, Unknown=3, NotChecked=0, Total=2352 [2022-11-03 02:41:01,904 INFO L87 Difference]: Start difference. First operand 1423 states and 2238 transitions. Second operand has 21 states, 20 states have (on average 1.95) internal successors, (39), 18 states have internal predecessors, (39), 8 states have call successors, (21), 2 states have call predecessors, (21), 2 states have return successors, (20), 7 states have call predecessors, (20), 7 states have call successors, (20) [2022-11-03 02:41:07,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:41:07,708 INFO L93 Difference]: Finished difference Result 1456 states and 2267 transitions. [2022-11-03 02:41:07,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-03 02:41:07,709 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 1.95) internal successors, (39), 18 states have internal predecessors, (39), 8 states have call successors, (21), 2 states have call predecessors, (21), 2 states have return successors, (20), 7 states have call predecessors, (20), 7 states have call successors, (20) Word has length 125 [2022-11-03 02:41:07,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:41:07,716 INFO L225 Difference]: With dead ends: 1456 [2022-11-03 02:41:07,716 INFO L226 Difference]: Without dead ends: 1449 [2022-11-03 02:41:07,718 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 340 GetRequests, 269 SyntacticMatches, 14 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1208 ImplicationChecksByTransitivity, 59.9s TimeCoverageRelationStatistics Valid=312, Invalid=3107, Unknown=3, NotChecked=0, Total=3422 [2022-11-03 02:41:07,718 INFO L413 NwaCegarLoop]: 49 mSDtfsCounter, 62 mSDsluCounter, 365 mSDsCounter, 0 mSdLazyCounter, 1413 mSolverCounterSat, 79 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 78 SdHoareTripleChecker+Valid, 394 SdHoareTripleChecker+Invalid, 1736 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 79 IncrementalHoareTripleChecker+Valid, 1413 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 244 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:41:07,719 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [78 Valid, 394 Invalid, 1736 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 1413 Invalid, 0 Unknown, 244 Unchecked, 2.0s Time] [2022-11-03 02:41:07,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1449 states. [2022-11-03 02:41:09,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1449 to 1439. [2022-11-03 02:41:09,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1439 states, 737 states have (on average 1.2930800542740841) internal successors, (953), 740 states have internal predecessors, (953), 649 states have call successors, (649), 52 states have call predecessors, (649), 52 states have return successors, (648), 646 states have call predecessors, (648), 648 states have call successors, (648) [2022-11-03 02:41:09,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1439 states to 1439 states and 2250 transitions. [2022-11-03 02:41:09,910 INFO L78 Accepts]: Start accepts. Automaton has 1439 states and 2250 transitions. Word has length 125 [2022-11-03 02:41:09,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:41:09,910 INFO L495 AbstractCegarLoop]: Abstraction has 1439 states and 2250 transitions. [2022-11-03 02:41:09,910 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 1.95) internal successors, (39), 18 states have internal predecessors, (39), 8 states have call successors, (21), 2 states have call predecessors, (21), 2 states have return successors, (20), 7 states have call predecessors, (20), 7 states have call successors, (20) [2022-11-03 02:41:09,910 INFO L276 IsEmpty]: Start isEmpty. Operand 1439 states and 2250 transitions. [2022-11-03 02:41:09,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2022-11-03 02:41:09,913 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:41:09,914 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:41:09,940 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-03 02:41:10,128 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:41:10,129 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:41:10,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:41:10,129 INFO L85 PathProgramCache]: Analyzing trace with hash 254217485, now seen corresponding path program 4 times [2022-11-03 02:41:10,129 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:41:10,129 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [858404832] [2022-11-03 02:41:10,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:41:10,129 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:41:10,141 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:41:10,141 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [239231889] [2022-11-03 02:41:10,141 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:41:10,141 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:41:10,142 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:41:10,143 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:41:10,144 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-03 02:41:10,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:41:10,222 INFO L263 TraceCheckSpWp]: Trace formula consists of 317 conjuncts, 107 conjunts are in the unsatisfiable core [2022-11-03 02:41:10,227 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:41:29,182 WARN L234 SmtUtils]: Spent 8.87s on a formula simplification that was a NOOP. DAG size: 93 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-03 02:41:58,505 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:41:58,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [858404832] [2022-11-03 02:41:58,512 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:41:58,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [239231889] [2022-11-03 02:41:58,512 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: Div with more than two parameters [2022-11-03 02:41:58,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [777894766] [2022-11-03 02:41:58,513 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-03 02:41:58,513 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:41:58,514 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:41:58,514 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:41:58,514 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:42:04,225 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2022-11-03 02:42:04,265 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-03 02:42:04,278 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:42:21,946 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '41629#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2022-11-03 02:42:21,947 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:42:21,947 INFO L184 FreeRefinementEngine]: Found 0 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:42:21,947 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [] total 0 [2022-11-03 02:42:21,947 ERROR L170 FreeRefinementEngine]: Strategy SIFA_TAIPAN failed to provide any proof altough trace is infeasible [2022-11-03 02:42:21,947 INFO L359 BasicCegarLoop]: Counterexample might be feasible [2022-11-03 02:42:21,954 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2022-11-03 02:42:21,993 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-11-03 02:42:22,172 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:42:22,175 INFO L444 BasicCegarLoop]: Path program histogram: [7, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:42:22,179 INFO L178 ceAbstractionStarter]: Computing trace abstraction results [2022-11-03 02:42:22,216 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 03.11 02:42:22 BoogieIcfgContainer [2022-11-03 02:42:22,216 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2022-11-03 02:42:22,217 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2022-11-03 02:42:22,217 INFO L271 PluginConnector]: Initializing Witness Printer... [2022-11-03 02:42:22,217 INFO L275 PluginConnector]: Witness Printer initialized [2022-11-03 02:42:22,218 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 02:31:29" (3/4) ... [2022-11-03 02:42:22,220 INFO L140 WitnessPrinter]: No result that supports witness generation found [2022-11-03 02:42:22,220 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2022-11-03 02:42:22,220 INFO L158 Benchmark]: Toolchain (without parser) took 653100.08ms. Allocated memory was 125.8MB in the beginning and 708.8MB in the end (delta: 583.0MB). Free memory was 94.6MB in the beginning and 594.0MB in the end (delta: -499.4MB). Peak memory consumption was 84.7MB. Max. memory is 16.1GB. [2022-11-03 02:42:22,221 INFO L158 Benchmark]: CDTParser took 0.26ms. Allocated memory is still 90.2MB. Free memory is still 45.0MB. There was no memory consumed. Max. memory is 16.1GB. [2022-11-03 02:42:22,221 INFO L158 Benchmark]: CACSL2BoogieTranslator took 283.25ms. Allocated memory is still 125.8MB. Free memory was 94.6MB in the beginning and 101.5MB in the end (delta: -6.9MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2022-11-03 02:42:22,221 INFO L158 Benchmark]: Boogie Procedure Inliner took 33.16ms. Allocated memory is still 125.8MB. Free memory was 101.5MB in the beginning and 100.2MB in the end (delta: 1.4MB). There was no memory consumed. Max. memory is 16.1GB. [2022-11-03 02:42:22,222 INFO L158 Benchmark]: Boogie Preprocessor took 54.70ms. Allocated memory is still 125.8MB. Free memory was 100.2MB in the beginning and 98.9MB in the end (delta: 1.3MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2022-11-03 02:42:22,222 INFO L158 Benchmark]: RCFGBuilder took 411.47ms. Allocated memory is still 125.8MB. Free memory was 98.9MB in the beginning and 86.0MB in the end (delta: 12.9MB). Peak memory consumption was 12.6MB. Max. memory is 16.1GB. [2022-11-03 02:42:22,222 INFO L158 Benchmark]: TraceAbstraction took 652301.41ms. Allocated memory was 125.8MB in the beginning and 708.8MB in the end (delta: 583.0MB). Free memory was 85.5MB in the beginning and 594.0MB in the end (delta: -508.5MB). Peak memory consumption was 77.3MB. Max. memory is 16.1GB. [2022-11-03 02:42:22,222 INFO L158 Benchmark]: Witness Printer took 3.29ms. Allocated memory is still 708.8MB. Free memory is still 594.0MB. There was no memory consumed. Max. memory is 16.1GB. [2022-11-03 02:42:22,224 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.26ms. Allocated memory is still 90.2MB. Free memory is still 45.0MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 283.25ms. Allocated memory is still 125.8MB. Free memory was 94.6MB in the beginning and 101.5MB in the end (delta: -6.9MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 33.16ms. Allocated memory is still 125.8MB. Free memory was 101.5MB in the beginning and 100.2MB in the end (delta: 1.4MB). There was no memory consumed. Max. memory is 16.1GB. * Boogie Preprocessor took 54.70ms. Allocated memory is still 125.8MB. Free memory was 100.2MB in the beginning and 98.9MB in the end (delta: 1.3MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 411.47ms. Allocated memory is still 125.8MB. Free memory was 98.9MB in the beginning and 86.0MB in the end (delta: 12.9MB). Peak memory consumption was 12.6MB. Max. memory is 16.1GB. * TraceAbstraction took 652301.41ms. Allocated memory was 125.8MB in the beginning and 708.8MB in the end (delta: 583.0MB). Free memory was 85.5MB in the beginning and 594.0MB in the end (delta: -508.5MB). Peak memory consumption was 77.3MB. Max. memory is 16.1GB. * Witness Printer took 3.29ms. Allocated memory is still 708.8MB. Free memory is still 594.0MB. There was no memory consumed. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - UnprovableResult [Line: 13]: Unable to prove that call to reach_error is unreachable Unable to prove that call to reach_error is unreachable Reason: unable to decide satisfiability of path constraint. Possible FailurePath: [L19] int x, y; [L20] long long a, b, p, q, r, s; [L21] x = __VERIFIER_nondet_int() [L22] CALL assume_abort_if_not(x>=0 && x<=5) [L8] COND FALSE !(!cond) [L22] RET assume_abort_if_not(x>=0 && x<=5) [L23] y = __VERIFIER_nondet_int() [L24] CALL assume_abort_if_not(y>=0 && y<=5) [L8] COND FALSE !(!cond) [L24] RET assume_abort_if_not(y>=0 && y<=5) [L25] CALL assume_abort_if_not(x >= 1) [L8] COND FALSE !(!cond) [L25] RET assume_abort_if_not(x >= 1) [L26] CALL assume_abort_if_not(y >= 1) [L8] COND FALSE !(!cond) [L26] RET assume_abort_if_not(y >= 1) [L28] a = x [L29] b = y [L30] p = 1 [L31] q = 0 [L32] r = 0 [L33] s = 1 [L35] COND TRUE 1 [L36] COND FALSE !(!(b != 0)) [L38] long long c, k; [L39] c = a [L40] k = 0 [L42] COND TRUE 1 [L43] COND FALSE !(!(c >= b)) [L45] long long d, v; [L46] d = 1 [L47] v = b [L49] COND TRUE 1 [L50] CALL __VERIFIER_assert(a == y * r + x * p) [L11] COND FALSE !(!(cond)) [L50] RET __VERIFIER_assert(a == y * r + x * p) [L51] CALL __VERIFIER_assert(b == x * q + y * s) [L11] COND FALSE !(!(cond)) [L51] RET __VERIFIER_assert(b == x * q + y * s) [L52] CALL __VERIFIER_assert(a == k * b + c) [L11] COND FALSE !(!(cond)) [L52] RET __VERIFIER_assert(a == k * b + c) [L53] CALL __VERIFIER_assert(v == b * d) [L11] COND FALSE !(!(cond)) [L53] RET __VERIFIER_assert(v == b * d) [L55] COND TRUE !(c >= 2 * v) [L60] c = c - v [L61] k = k + d [L42] COND TRUE 1 [L43] COND TRUE !(c >= b) [L64] a = b [L65] b = c [L66] long long temp; [L67] temp = p [L68] p = q [L69] q = temp - q * k [L70] temp = r [L71] r = s [L72] s = temp - s * k [L35] COND TRUE 1 [L36] COND FALSE !(!(b != 0)) [L38] long long c, k; [L39] c = a [L40] k = 0 [L42] COND TRUE 1 [L43] COND FALSE !(!(c >= b)) [L45] long long d, v; [L46] d = 1 [L47] v = b [L49] COND TRUE 1 [L50] CALL __VERIFIER_assert(a == y * r + x * p) [L11] COND FALSE !(!(cond)) [L50] RET __VERIFIER_assert(a == y * r + x * p) [L51] CALL __VERIFIER_assert(b == x * q + y * s) [L11] COND FALSE !(!(cond)) [L51] RET __VERIFIER_assert(b == x * q + y * s) [L52] CALL __VERIFIER_assert(a == k * b + c) [L11] COND FALSE !(!(cond)) [L52] RET __VERIFIER_assert(a == k * b + c) [L53] CALL __VERIFIER_assert(v == b * d) [L11] COND FALSE !(!(cond)) [L53] RET __VERIFIER_assert(v == b * d) [L55] COND FALSE !(!(c >= 2 * v)) [L57] d = 2 * d [L58] v = 2 * v [L49] COND TRUE 1 [L50] CALL __VERIFIER_assert(a == y * r + x * p) [L11] COND FALSE !(!(cond)) [L50] RET __VERIFIER_assert(a == y * r + x * p) [L51] CALL __VERIFIER_assert(b == x * q + y * s) [L11] COND FALSE !(!(cond)) [L51] RET __VERIFIER_assert(b == x * q + y * s) [L52] CALL __VERIFIER_assert(a == k * b + c) [L11] COND FALSE !(!(cond)) [L52] RET __VERIFIER_assert(a == k * b + c) [L53] CALL __VERIFIER_assert(v == b * d) [L11] COND FALSE !(!(cond)) [L53] RET __VERIFIER_assert(v == b * d) [L55] COND TRUE !(c >= 2 * v) [L60] c = c - v [L61] k = k + d [L42] COND TRUE 1 [L43] COND FALSE !(!(c >= b)) [L45] long long d, v; [L46] d = 1 [L47] v = b [L49] COND TRUE 1 [L50] CALL __VERIFIER_assert(a == y * r + x * p) [L11] COND FALSE !(!(cond)) [L50] RET __VERIFIER_assert(a == y * r + x * p) [L51] CALL __VERIFIER_assert(b == x * q + y * s) [L11] COND FALSE !(!(cond)) [L51] RET __VERIFIER_assert(b == x * q + y * s) [L52] CALL __VERIFIER_assert(a == k * b + c) [L11] COND FALSE !(!(cond)) [L52] RET __VERIFIER_assert(a == k * b + c) [L53] CALL __VERIFIER_assert(v == b * d) [L11] COND FALSE !(!(cond)) [L53] RET __VERIFIER_assert(v == b * d) [L55] COND TRUE !(c >= 2 * v) [L60] c = c - v [L61] k = k + d [L42] COND TRUE 1 [L43] COND TRUE !(c >= b) [L64] a = b [L65] b = c [L66] long long temp; [L67] temp = p [L68] p = q [L69] q = temp - q * k [L70] temp = r [L71] r = s [L72] s = temp - s * k [L35] COND TRUE 1 [L36] COND TRUE !(b != 0) [L74] CALL __VERIFIER_assert(p*x - q*x + r*y - s*y == a) [L11] COND TRUE !(cond) [L13] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 30 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 652.1s, OverallIterations: 22, TraceHistogramMax: 17, PathProgramHistogramMax: 7, EmptinessCheckTime: 0.1s, AutomataDifference: 294.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 20 mSolverCounterUnknown, 1949 SdHoareTripleChecker+Valid, 161.3s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 1864 mSDsluCounter, 4788 SdHoareTripleChecker+Invalid, 158.9s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 674 IncrementalHoareTripleChecker+Unchecked, 4052 mSDsCounter, 3379 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 14083 IncrementalHoareTripleChecker+Invalid, 18156 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 3379 mSolverCounterUnsat, 945 mSDtfsCounter, 14083 mSolverCounterSat, 0.2s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 3901 GetRequests, 2845 SyntacticMatches, 158 SemanticMatches, 898 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22602 ImplicationChecksByTransitivity, 286.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=1439occurred in iteration=21, InterpolantAutomatonStates: 491, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 11.4s AutomataMinimizationTime, 21 MinimizatonAttempts, 901 StatesRemovedByMinimization, 20 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.3s SsaConstructionTime, 0.9s SatisfiabilityAnalysisTime, 101.5s InterpolantComputationTime, 1458 NumberOfCodeBlocks, 1338 NumberOfCodeBlocksAsserted, 33 NumberOfCheckSat, 2311 ConstructedInterpolants, 21 QuantifiedInterpolants, 19990 SizeOfPredicates, 159 NumberOfNonLiveVariables, 3840 ConjunctsInSsa, 822 ConjunctsInUnsatCore, 36 InterpolantComputations, 6 PerfectInterpolantSequences, 4463/5150 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: OVERALL_TIME: 2.2s, ICFG_INTERPRETER_ENTERED_PROCEDURES: 5, DAG_INTERPRETER_EARLY_EXIT_QUERIES_NONTRIVIAL: 38, DAG_INTERPRETER_EARLY_EXITS: 2, TOOLS_POST_APPLICATIONS: 43, TOOLS_POST_TIME: 0.8s, TOOLS_POST_CALL_APPLICATIONS: 25, TOOLS_POST_CALL_TIME: 0.7s, TOOLS_POST_RETURN_APPLICATIONS: 16, TOOLS_POST_RETURN_TIME: 0.1s, TOOLS_QUANTIFIERELIM_APPLICATIONS: 84, TOOLS_QUANTIFIERELIM_TIME: 1.5s, TOOLS_QUANTIFIERELIM_MAX_TIME: 0.2s, FLUID_QUERY_TIME: 0.0s, FLUID_QUERIES: 119, FLUID_YES_ANSWERS: 0, DOMAIN_JOIN_APPLICATIONS: 30, DOMAIN_JOIN_TIME: 0.3s, DOMAIN_ALPHA_APPLICATIONS: 0, DOMAIN_ALPHA_TIME: 0.0s, DOMAIN_WIDEN_APPLICATIONS: 2, DOMAIN_WIDEN_TIME: 0.1s, DOMAIN_ISSUBSETEQ_APPLICATIONS: 4, DOMAIN_ISSUBSETEQ_TIME: 0.0s, DOMAIN_ISBOTTOM_APPLICATIONS: 38, DOMAIN_ISBOTTOM_TIME: 0.1s, LOOP_SUMMARIZER_APPLICATIONS: 2, LOOP_SUMMARIZER_CACHE_MISSES: 2, LOOP_SUMMARIZER_OVERALL_TIME: 0.5s, LOOP_SUMMARIZER_NEW_COMPUTATION_TIME: 0.5s, LOOP_SUMMARIZER_FIXPOINT_ITERATIONS: 4, CALL_SUMMARIZER_APPLICATIONS: 16, CALL_SUMMARIZER_CACHE_MISSES: 2, CALL_SUMMARIZER_OVERALL_TIME: 0.0s, CALL_SUMMARIZER_NEW_COMPUTATION_TIME: 0.0s, PROCEDURE_GRAPH_BUILDER_TIME: 0.0s, PATH_EXPR_TIME: 0.0s, REGEX_TO_DAG_TIME: 0.0s, DAG_COMPRESSION_TIME: 0.0s, DAG_COMPRESSION_PROCESSED_NODES: 487, DAG_COMPRESSION_RETAINED_NODES: 119, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces [2022-11-03 02:42:22,381 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound5.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI --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 1aca3c96522e618238f11f200c96e0ec490e756d4e04895bd2a51f9a4ff85af1 --- 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-5e519f3 [2022-11-03 02:42:24,631 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-03 02:42:24,633 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-03 02:42:24,681 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-03 02:42:24,681 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-03 02:42:24,682 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-03 02:42:24,684 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-03 02:42:24,685 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-03 02:42:24,690 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-03 02:42:24,692 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-03 02:42:24,693 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-03 02:42:24,695 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-03 02:42:24,695 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-03 02:42:24,696 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-03 02:42:24,697 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-03 02:42:24,699 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-03 02:42:24,699 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-03 02:42:24,700 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-03 02:42:24,702 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-03 02:42:24,704 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-03 02:42:24,705 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-03 02:42:24,706 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-03 02:42:24,707 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-03 02:42:24,708 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-03 02:42:24,712 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-03 02:42:24,712 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-03 02:42:24,712 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-03 02:42:24,713 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-03 02:42:24,714 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-03 02:42:24,715 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-03 02:42:24,715 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-03 02:42:24,716 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-03 02:42:24,717 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-03 02:42:24,717 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-03 02:42:24,718 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-03 02:42:24,719 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-03 02:42:24,720 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-03 02:42:24,720 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-03 02:42:24,720 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-03 02:42:24,721 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-03 02:42:24,722 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-03 02:42:24,723 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2022-11-03 02:42:24,745 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-03 02:42:24,746 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-03 02:42:24,746 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-03 02:42:24,746 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-03 02:42:24,747 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-03 02:42:24,747 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-03 02:42:24,748 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-03 02:42:24,748 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-03 02:42:24,748 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-03 02:42:24,748 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-03 02:42:24,749 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-03 02:42:24,749 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-03 02:42:24,750 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-03 02:42:24,750 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-03 02:42:24,750 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-03 02:42:24,750 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-03 02:42:24,750 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-03 02:42:24,751 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-03 02:42:24,751 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-03 02:42:24,751 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-11-03 02:42:24,751 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2022-11-03 02:42:24,752 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2022-11-03 02:42:24,752 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-03 02:42:24,752 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-03 02:42:24,752 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-03 02:42:24,753 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-03 02:42:24,753 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-03 02:42:24,753 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-11-03 02:42:24,753 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-03 02:42:24,753 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 02:42:24,754 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-03 02:42:24,754 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-03 02:42:24,754 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-03 02:42:24,754 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2022-11-03 02:42:24,755 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2022-11-03 02:42:24,755 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-03 02:42:24,755 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-03 02:42:24,755 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2022-11-03 02:42:24,756 INFO L138 SettingsManager]: * Logic for external solver=AUFBV 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_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1aca3c96522e618238f11f200c96e0ec490e756d4e04895bd2a51f9a4ff85af1 [2022-11-03 02:42:25,131 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-03 02:42:25,162 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-03 02:42:25,166 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-03 02:42:25,167 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-03 02:42:25,168 INFO L275 PluginConnector]: CDTParser initialized [2022-11-03 02:42:25,170 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound5.c [2022-11-03 02:42:25,241 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/data/748a5f182/325da26fc63e487b875eb48a459ec025/FLAG2c9c22faa [2022-11-03 02:42:25,790 INFO L306 CDTParser]: Found 1 translation units. [2022-11-03 02:42:25,793 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound5.c [2022-11-03 02:42:25,801 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/data/748a5f182/325da26fc63e487b875eb48a459ec025/FLAG2c9c22faa [2022-11-03 02:42:26,156 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/data/748a5f182/325da26fc63e487b875eb48a459ec025 [2022-11-03 02:42:26,159 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-03 02:42:26,160 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-03 02:42:26,166 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-03 02:42:26,166 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-03 02:42:26,170 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-03 02:42:26,171 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 02:42:26" (1/1) ... [2022-11-03 02:42:26,173 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@68fb1580 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:42:26, skipping insertion in model container [2022-11-03 02:42:26,174 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 02:42:26" (1/1) ... [2022-11-03 02:42:26,184 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-03 02:42:26,205 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-03 02:42:26,345 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound5.c[490,503] [2022-11-03 02:42:26,366 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 02:42:26,377 INFO L203 MainTranslator]: Completed pre-run [2022-11-03 02:42:26,414 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound5.c[490,503] [2022-11-03 02:42:26,446 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 02:42:26,460 INFO L208 MainTranslator]: Completed translation [2022-11-03 02:42:26,461 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:42:26 WrapperNode [2022-11-03 02:42:26,461 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-03 02:42:26,462 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-03 02:42:26,462 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-03 02:42:26,463 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-03 02:42:26,470 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:42:26" (1/1) ... [2022-11-03 02:42:26,477 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:42:26" (1/1) ... [2022-11-03 02:42:26,496 INFO L138 Inliner]: procedures = 14, calls = 16, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 78 [2022-11-03 02:42:26,496 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-03 02:42:26,497 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-03 02:42:26,497 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-03 02:42:26,498 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-03 02:42:26,506 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:42:26" (1/1) ... [2022-11-03 02:42:26,506 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:42:26" (1/1) ... [2022-11-03 02:42:26,509 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:42:26" (1/1) ... [2022-11-03 02:42:26,509 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:42:26" (1/1) ... [2022-11-03 02:42:26,514 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:42:26" (1/1) ... [2022-11-03 02:42:26,518 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:42:26" (1/1) ... [2022-11-03 02:42:26,520 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:42:26" (1/1) ... [2022-11-03 02:42:26,521 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:42:26" (1/1) ... [2022-11-03 02:42:26,523 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-03 02:42:26,524 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-03 02:42:26,524 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-03 02:42:26,524 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-03 02:42:26,525 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:42:26" (1/1) ... [2022-11-03 02:42:26,531 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 02:42:26,541 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:42:26,554 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-03 02:42:26,584 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-03 02:42:26,604 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-03 02:42:26,605 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2022-11-03 02:42:26,605 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-11-03 02:42:26,605 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-11-03 02:42:26,605 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-03 02:42:26,605 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-03 02:42:26,605 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-03 02:42:26,606 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-03 02:42:26,693 INFO L235 CfgBuilder]: Building ICFG [2022-11-03 02:42:26,695 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-03 02:42:27,091 INFO L276 CfgBuilder]: Performing block encoding [2022-11-03 02:42:27,097 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-03 02:42:27,108 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-11-03 02:42:27,110 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 02:42:27 BoogieIcfgContainer [2022-11-03 02:42:27,117 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-03 02:42:27,119 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-03 02:42:27,120 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-03 02:42:27,123 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-03 02:42:27,125 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.11 02:42:26" (1/3) ... [2022-11-03 02:42:27,126 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7f7068ee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 02:42:27, skipping insertion in model container [2022-11-03 02:42:27,126 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:42:26" (2/3) ... [2022-11-03 02:42:27,127 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7f7068ee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 02:42:27, skipping insertion in model container [2022-11-03 02:42:27,127 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 02:42:27" (3/3) ... [2022-11-03 02:42:27,129 INFO L112 eAbstractionObserver]: Analyzing ICFG egcd3-ll_valuebound5.c [2022-11-03 02:42:27,149 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-03 02:42:27,150 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-03 02:42:27,235 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-03 02:42:27,245 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;@3da87cdb, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-03 02:42:27,245 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-03 02:42:27,250 INFO L276 IsEmpty]: Start isEmpty. Operand has 35 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 23 states have internal predecessors, (34), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-03 02:42:27,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-03 02:42:27,259 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:42:27,260 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:42:27,261 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:42:27,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:42:27,268 INFO L85 PathProgramCache]: Analyzing trace with hash 872320404, now seen corresponding path program 1 times [2022-11-03 02:42:27,283 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 02:42:27,283 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [236045217] [2022-11-03 02:42:27,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:42:27,284 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 02:42:27,284 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 02:42:27,289 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 02:42:27,331 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2022-11-03 02:42:27,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:42:27,536 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 1 conjunts are in the unsatisfiable core [2022-11-03 02:42:27,541 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:42:27,573 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-03 02:42:27,574 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 02:42:27,575 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 02:42:27,576 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [236045217] [2022-11-03 02:42:27,577 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [236045217] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:42:27,578 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:42:27,579 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-03 02:42:27,580 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [707523421] [2022-11-03 02:42:27,582 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:42:27,587 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-03 02:42:27,587 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 02:42:27,627 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-03 02:42:27,628 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-03 02:42:27,630 INFO L87 Difference]: Start difference. First operand has 35 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 23 states have internal predecessors, (34), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Second operand has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-03 02:42:27,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:42:27,663 INFO L93 Difference]: Finished difference Result 67 states and 109 transitions. [2022-11-03 02:42:27,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-03 02:42:27,669 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 29 [2022-11-03 02:42:27,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:42:27,676 INFO L225 Difference]: With dead ends: 67 [2022-11-03 02:42:27,677 INFO L226 Difference]: Without dead ends: 31 [2022-11-03 02:42:27,680 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-03 02:42:27,684 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:42:27,688 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 02:42:27,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-11-03 02:42:27,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2022-11-03 02:42:27,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 20 states have internal predecessors, (23), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-11-03 02:42:27,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 40 transitions. [2022-11-03 02:42:27,727 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 40 transitions. Word has length 29 [2022-11-03 02:42:27,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:42:27,728 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 40 transitions. [2022-11-03 02:42:27,729 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-03 02:42:27,731 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 40 transitions. [2022-11-03 02:42:27,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-03 02:42:27,733 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:42:27,733 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:42:27,749 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (2)] Ended with exit code 0 [2022-11-03 02:42:27,936 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 [2022-11-03 02:42:27,937 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:42:27,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:42:27,937 INFO L85 PathProgramCache]: Analyzing trace with hash 1714405113, now seen corresponding path program 1 times [2022-11-03 02:42:27,938 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 02:42:27,938 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [956211444] [2022-11-03 02:42:27,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:42:27,939 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 02:42:27,939 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 02:42:27,940 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 02:42:27,972 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2022-11-03 02:42:28,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:42:28,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-03 02:42:28,188 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:42:28,471 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-03 02:42:28,471 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:42:28,761 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 02:42:28,761 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 02:42:28,761 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [956211444] [2022-11-03 02:42:28,761 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [956211444] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-03 02:42:28,761 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 02:42:28,762 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [7] total 10 [2022-11-03 02:42:28,762 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1407215244] [2022-11-03 02:42:28,762 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:42:28,763 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-03 02:42:28,763 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 02:42:28,764 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-03 02:42:28,764 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2022-11-03 02:42:28,764 INFO L87 Difference]: Start difference. First operand 31 states and 40 transitions. Second operand has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-03 02:42:31,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:42:31,165 INFO L93 Difference]: Finished difference Result 40 states and 49 transitions. [2022-11-03 02:42:31,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-03 02:42:31,174 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 30 [2022-11-03 02:42:31,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:42:31,175 INFO L225 Difference]: With dead ends: 40 [2022-11-03 02:42:31,175 INFO L226 Difference]: Without dead ends: 33 [2022-11-03 02:42:31,176 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2022-11-03 02:42:31,177 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 23 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2022-11-03 02:42:31,178 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 92 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2022-11-03 02:42:31,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-11-03 02:42:31,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2022-11-03 02:42:31,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 21 states have (on average 1.1904761904761905) internal successors, (25), 22 states have internal predecessors, (25), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-11-03 02:42:31,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 42 transitions. [2022-11-03 02:42:31,201 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 42 transitions. Word has length 30 [2022-11-03 02:42:31,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:42:31,203 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 42 transitions. [2022-11-03 02:42:31,203 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-03 02:42:31,203 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 42 transitions. [2022-11-03 02:42:31,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-11-03 02:42:31,206 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:42:31,206 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:42:31,228 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2022-11-03 02:42:31,421 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 [2022-11-03 02:42:31,422 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:42:31,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:42:31,422 INFO L85 PathProgramCache]: Analyzing trace with hash -1825736765, now seen corresponding path program 1 times [2022-11-03 02:42:31,423 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 02:42:31,423 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1750737797] [2022-11-03 02:42:31,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:42:31,423 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 02:42:31,423 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 02:42:31,424 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 02:42:31,429 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2022-11-03 02:42:31,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:42:31,567 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-03 02:42:31,570 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:42:32,461 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 02:42:32,461 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:42:38,832 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-03 02:42:38,833 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 02:42:38,833 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1750737797] [2022-11-03 02:42:38,833 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1750737797] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-03 02:42:38,833 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 02:42:38,833 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10] total 13 [2022-11-03 02:42:38,834 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1650602726] [2022-11-03 02:42:38,834 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:42:38,834 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-03 02:42:38,834 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 02:42:38,835 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-03 02:42:38,835 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2022-11-03 02:42:38,836 INFO L87 Difference]: Start difference. First operand 33 states and 42 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-03 02:42:46,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:42:46,217 INFO L93 Difference]: Finished difference Result 49 states and 63 transitions. [2022-11-03 02:42:46,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-03 02:42:46,241 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 33 [2022-11-03 02:42:46,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:42:46,242 INFO L225 Difference]: With dead ends: 49 [2022-11-03 02:42:46,242 INFO L226 Difference]: Without dead ends: 47 [2022-11-03 02:42:46,242 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2022-11-03 02:42:46,243 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 10 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:42:46,244 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 133 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 7.0s Time] [2022-11-03 02:42:46,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-11-03 02:42:46,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 46. [2022-11-03 02:42:46,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 29 states have (on average 1.206896551724138) internal successors, (35), 30 states have internal predecessors, (35), 13 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-11-03 02:42:46,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 60 transitions. [2022-11-03 02:42:46,270 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 60 transitions. Word has length 33 [2022-11-03 02:42:46,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:42:46,271 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 60 transitions. [2022-11-03 02:42:46,271 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-03 02:42:46,272 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 60 transitions. [2022-11-03 02:42:46,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-11-03 02:42:46,274 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:42:46,274 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:42:46,293 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2022-11-03 02:42:46,475 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 [2022-11-03 02:42:46,475 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:42:46,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:42:46,476 INFO L85 PathProgramCache]: Analyzing trace with hash -1547103247, now seen corresponding path program 1 times [2022-11-03 02:42:46,476 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 02:42:46,477 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1197379071] [2022-11-03 02:42:46,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:42:46,477 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 02:42:46,477 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 02:42:46,478 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 02:42:46,496 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2022-11-03 02:42:46,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:42:46,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-03 02:42:46,755 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:42:47,338 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 3 proven. 11 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-03 02:42:47,339 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:42:47,907 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 6 proven. 5 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 02:42:47,907 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 02:42:47,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1197379071] [2022-11-03 02:42:47,907 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1197379071] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:42:47,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [200840961] [2022-11-03 02:42:47,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:42:47,908 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-03 02:42:47,908 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/cvc4 [2022-11-03 02:42:47,916 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-03 02:42:47,948 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (6)] Waiting until timeout for monitored process [2022-11-03 02:42:48,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:42:48,354 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-03 02:42:48,356 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:42:49,149 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 6 proven. 5 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 02:42:49,149 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:42:49,360 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 6 proven. 5 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 02:42:49,360 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [200840961] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:42:49,360 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [222910238] [2022-11-03 02:42:49,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:42:49,361 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:42:49,361 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:42:49,374 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:42:49,384 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-03 02:42:49,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:42:49,658 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-03 02:42:49,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:42:49,827 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 6 proven. 5 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 02:42:49,827 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:42:50,021 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 6 proven. 5 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 02:42:50,022 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [222910238] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:42:50,022 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-03 02:42:50,022 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8, 8, 8, 8] total 18 [2022-11-03 02:42:50,022 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1418416654] [2022-11-03 02:42:50,022 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-03 02:42:50,023 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-03 02:42:50,023 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 02:42:50,024 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-03 02:42:50,024 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2022-11-03 02:42:50,024 INFO L87 Difference]: Start difference. First operand 46 states and 60 transitions. Second operand has 18 states, 18 states have (on average 2.1666666666666665) internal successors, (39), 15 states have internal predecessors, (39), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (10), 5 states have call predecessors, (10), 5 states have call successors, (10) [2022-11-03 02:42:51,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:42:51,574 INFO L93 Difference]: Finished difference Result 58 states and 73 transitions. [2022-11-03 02:42:51,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-03 02:42:51,575 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.1666666666666665) internal successors, (39), 15 states have internal predecessors, (39), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (10), 5 states have call predecessors, (10), 5 states have call successors, (10) Word has length 35 [2022-11-03 02:42:51,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:42:51,576 INFO L225 Difference]: With dead ends: 58 [2022-11-03 02:42:51,577 INFO L226 Difference]: Without dead ends: 51 [2022-11-03 02:42:51,578 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 188 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=62, Invalid=318, Unknown=0, NotChecked=0, Total=380 [2022-11-03 02:42:51,579 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 4 mSDsluCounter, 268 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 299 SdHoareTripleChecker+Invalid, 100 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 27 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-11-03 02:42:51,579 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 299 Invalid, 100 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 72 Invalid, 0 Unknown, 27 Unchecked, 1.4s Time] [2022-11-03 02:42:51,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-11-03 02:42:51,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2022-11-03 02:42:51,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 34 states have (on average 1.2058823529411764) internal successors, (41), 35 states have internal predecessors, (41), 13 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-11-03 02:42:51,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 66 transitions. [2022-11-03 02:42:51,607 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 66 transitions. Word has length 35 [2022-11-03 02:42:51,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:42:51,607 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 66 transitions. [2022-11-03 02:42:51,608 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.1666666666666665) internal successors, (39), 15 states have internal predecessors, (39), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (10), 5 states have call predecessors, (10), 5 states have call successors, (10) [2022-11-03 02:42:51,608 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 66 transitions. [2022-11-03 02:42:51,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-11-03 02:42:51,609 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:42:51,609 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 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] [2022-11-03 02:42:51,621 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (6)] Forceful destruction successful, exit code 0 [2022-11-03 02:42:51,830 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2022-11-03 02:42:52,050 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-03 02:42:52,217 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:42:52,217 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:42:52,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:42:52,218 INFO L85 PathProgramCache]: Analyzing trace with hash -720434099, now seen corresponding path program 1 times [2022-11-03 02:42:52,218 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 02:42:52,218 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1568982860] [2022-11-03 02:42:52,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:42:52,219 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 02:42:52,219 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 02:42:52,220 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 02:42:52,223 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2022-11-03 02:42:52,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:42:52,367 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-03 02:42:52,369 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:42:53,253 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 02:42:53,253 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:43:06,115 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-03 02:43:06,115 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 02:43:06,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1568982860] [2022-11-03 02:43:06,115 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1568982860] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-03 02:43:06,115 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 02:43:06,115 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [10] total 14 [2022-11-03 02:43:06,116 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1429557464] [2022-11-03 02:43:06,116 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:43:06,116 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-03 02:43:06,116 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 02:43:06,117 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-03 02:43:06,117 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2022-11-03 02:43:06,117 INFO L87 Difference]: Start difference. First operand 51 states and 66 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-11-03 02:43:20,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:43:20,516 INFO L93 Difference]: Finished difference Result 58 states and 72 transitions. [2022-11-03 02:43:20,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-03 02:43:20,556 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 38 [2022-11-03 02:43:20,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:43:20,557 INFO L225 Difference]: With dead ends: 58 [2022-11-03 02:43:20,557 INFO L226 Difference]: Without dead ends: 56 [2022-11-03 02:43:20,557 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 9.9s TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2022-11-03 02:43:20,558 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 13 mSDsluCounter, 111 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 13.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 151 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.8s IncrementalHoareTripleChecker+Time [2022-11-03 02:43:20,559 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 151 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 13.8s Time] [2022-11-03 02:43:20,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-11-03 02:43:20,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2022-11-03 02:43:20,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 37 states have (on average 1.1891891891891893) internal successors, (44), 38 states have internal predecessors, (44), 13 states have call successors, (13), 4 states have call predecessors, (13), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-11-03 02:43:20,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 69 transitions. [2022-11-03 02:43:20,578 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 69 transitions. Word has length 38 [2022-11-03 02:43:20,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:43:20,579 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 69 transitions. [2022-11-03 02:43:20,579 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-11-03 02:43:20,579 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 69 transitions. [2022-11-03 02:43:20,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-11-03 02:43:20,580 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:43:20,581 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:43:20,598 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2022-11-03 02:43:20,798 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 [2022-11-03 02:43:20,798 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:43:20,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:43:20,799 INFO L85 PathProgramCache]: Analyzing trace with hash -376152117, now seen corresponding path program 1 times [2022-11-03 02:43:20,799 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 02:43:20,800 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1394708287] [2022-11-03 02:43:20,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:43:20,804 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 02:43:20,804 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 02:43:20,805 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 02:43:20,807 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2022-11-03 02:43:21,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:43:21,021 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-03 02:43:21,023 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:43:22,184 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 02:43:22,184 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:43:37,073 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-03 02:43:37,074 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 02:43:37,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1394708287] [2022-11-03 02:43:37,074 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1394708287] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:43:37,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1718916881] [2022-11-03 02:43:37,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:43:37,074 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-03 02:43:37,074 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/cvc4 [2022-11-03 02:43:37,075 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-03 02:43:37,081 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (10)] Waiting until timeout for monitored process [2022-11-03 02:43:37,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:43:37,477 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-03 02:43:37,479 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:43:39,093 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-03 02:43:39,094 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:43:53,799 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-03 02:43:53,799 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1718916881] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:43:53,799 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [201780309] [2022-11-03 02:43:53,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:43:53,799 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:43:53,800 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:43:53,801 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:43:53,802 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-03 02:43:53,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:43:53,980 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-03 02:43:53,982 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:43:54,667 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 02:43:54,668 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:43:59,104 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-03 02:43:59,105 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [201780309] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:43:59,105 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-03 02:43:59,105 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 6, 6, 6, 11, 6] total 19 [2022-11-03 02:43:59,106 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1837686917] [2022-11-03 02:43:59,106 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-03 02:43:59,106 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-03 02:43:59,107 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 02:43:59,107 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-03 02:43:59,107 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=284, Unknown=0, NotChecked=0, Total=342 [2022-11-03 02:43:59,108 INFO L87 Difference]: Start difference. First operand 55 states and 69 transitions. Second operand has 19 states, 18 states have (on average 3.2777777777777777) internal successors, (59), 15 states have internal predecessors, (59), 7 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (8), 4 states have call predecessors, (8), 3 states have call successors, (8) [2022-11-03 02:44:11,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:44:11,208 INFO L93 Difference]: Finished difference Result 75 states and 95 transitions. [2022-11-03 02:44:11,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-03 02:44:11,220 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 3.2777777777777777) internal successors, (59), 15 states have internal predecessors, (59), 7 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (8), 4 states have call predecessors, (8), 3 states have call successors, (8) Word has length 38 [2022-11-03 02:44:11,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:44:11,221 INFO L225 Difference]: With dead ends: 75 [2022-11-03 02:44:11,221 INFO L226 Difference]: Without dead ends: 73 [2022-11-03 02:44:11,222 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 205 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 22.9s TimeCoverageRelationStatistics Valid=68, Invalid=352, Unknown=0, NotChecked=0, Total=420 [2022-11-03 02:44:11,222 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 82 mSDsluCounter, 268 mSDsCounter, 0 mSdLazyCounter, 271 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 319 SdHoareTripleChecker+Invalid, 338 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 271 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 38 IncrementalHoareTripleChecker+Unchecked, 11.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:44:11,223 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [96 Valid, 319 Invalid, 338 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 271 Invalid, 0 Unknown, 38 Unchecked, 11.1s Time] [2022-11-03 02:44:11,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2022-11-03 02:44:11,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 71. [2022-11-03 02:44:11,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 48 states have (on average 1.2083333333333333) internal successors, (58), 49 states have internal predecessors, (58), 17 states have call successors, (17), 5 states have call predecessors, (17), 5 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2022-11-03 02:44:11,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 91 transitions. [2022-11-03 02:44:11,244 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 91 transitions. Word has length 38 [2022-11-03 02:44:11,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:44:11,244 INFO L495 AbstractCegarLoop]: Abstraction has 71 states and 91 transitions. [2022-11-03 02:44:11,244 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 3.2777777777777777) internal successors, (59), 15 states have internal predecessors, (59), 7 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (8), 4 states have call predecessors, (8), 3 states have call successors, (8) [2022-11-03 02:44:11,245 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 91 transitions. [2022-11-03 02:44:11,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-11-03 02:44:11,245 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:44:11,246 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:44:11,260 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2022-11-03 02:44:11,455 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (10)] Forceful destruction successful, exit code 0 [2022-11-03 02:44:11,680 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-03 02:44:11,851 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:44:11,851 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:44:11,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:44:11,852 INFO L85 PathProgramCache]: Analyzing trace with hash -65660423, now seen corresponding path program 2 times [2022-11-03 02:44:11,852 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 02:44:11,853 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1980829839] [2022-11-03 02:44:11,853 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-03 02:44:11,853 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 02:44:11,853 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 02:44:11,854 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 02:44:11,856 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2022-11-03 02:44:12,145 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-03 02:44:12,145 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:44:12,186 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-03 02:44:12,187 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:44:12,859 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 5 proven. 13 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 02:44:12,859 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:44:13,146 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-03 02:44:13,146 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 02:44:13,146 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1980829839] [2022-11-03 02:44:13,147 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1980829839] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:44:13,147 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [906272827] [2022-11-03 02:44:13,147 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-03 02:44:13,147 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-03 02:44:13,147 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/cvc4 [2022-11-03 02:44:13,148 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-03 02:44:13,149 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (13)] Waiting until timeout for monitored process [2022-11-03 02:44:13,503 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-03 02:44:13,503 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:44:13,504 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-03 02:44:13,505 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:44:13,555 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-03 02:44:13,556 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:44:13,618 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-03 02:44:13,619 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [906272827] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:44:13,619 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1342885934] [2022-11-03 02:44:13,619 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-03 02:44:13,619 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:44:13,619 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:44:13,620 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:44:13,621 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-03 02:44:13,901 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-03 02:44:13,901 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:44:13,938 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-03 02:44:13,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:44:13,995 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-03 02:44:13,995 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:44:14,053 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-03 02:44:14,053 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1342885934] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:44:14,054 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-03 02:44:14,054 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 5, 5, 5, 5, 5] total 12 [2022-11-03 02:44:14,054 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1249457520] [2022-11-03 02:44:14,054 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-03 02:44:14,055 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-03 02:44:14,055 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 02:44:14,055 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-03 02:44:14,056 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=107, Unknown=0, NotChecked=0, Total=132 [2022-11-03 02:44:14,056 INFO L87 Difference]: Start difference. First operand 71 states and 91 transitions. Second operand has 12 states, 12 states have (on average 3.1666666666666665) internal successors, (38), 11 states have internal predecessors, (38), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-03 02:44:16,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:44:16,513 INFO L93 Difference]: Finished difference Result 103 states and 132 transitions. [2022-11-03 02:44:16,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-03 02:44:16,514 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.1666666666666665) internal successors, (38), 11 states have internal predecessors, (38), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 40 [2022-11-03 02:44:16,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:44:16,515 INFO L225 Difference]: With dead ends: 103 [2022-11-03 02:44:16,515 INFO L226 Difference]: Without dead ends: 96 [2022-11-03 02:44:16,516 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 227 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=67, Invalid=313, Unknown=0, NotChecked=0, Total=380 [2022-11-03 02:44:16,516 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 6 mSDsluCounter, 277 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 314 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 47 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2022-11-03 02:44:16,517 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 314 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 39 Invalid, 0 Unknown, 47 Unchecked, 1.9s Time] [2022-11-03 02:44:16,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2022-11-03 02:44:16,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 85. [2022-11-03 02:44:16,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 62 states have (on average 1.2419354838709677) internal successors, (77), 63 states have internal predecessors, (77), 17 states have call successors, (17), 5 states have call predecessors, (17), 5 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2022-11-03 02:44:16,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 110 transitions. [2022-11-03 02:44:16,536 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 110 transitions. Word has length 40 [2022-11-03 02:44:16,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:44:16,537 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 110 transitions. [2022-11-03 02:44:16,537 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.1666666666666665) internal successors, (38), 11 states have internal predecessors, (38), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-03 02:44:16,537 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 110 transitions. [2022-11-03 02:44:16,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-11-03 02:44:16,538 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:44:16,538 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 3, 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] [2022-11-03 02:44:16,564 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2022-11-03 02:44:16,764 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (13)] Forceful destruction successful, exit code 0 [2022-11-03 02:44:17,022 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-03 02:44:17,161 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:44:17,161 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:44:17,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:44:17,161 INFO L85 PathProgramCache]: Analyzing trace with hash 279172547, now seen corresponding path program 1 times [2022-11-03 02:44:17,162 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 02:44:17,162 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2076735523] [2022-11-03 02:44:17,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:44:17,162 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 02:44:17,162 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 02:44:17,163 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 02:44:17,164 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2022-11-03 02:44:17,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:44:17,386 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-03 02:44:17,387 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:44:18,339 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2022-11-03 02:44:18,339 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:44:22,363 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-03 02:44:22,363 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 02:44:22,364 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2076735523] [2022-11-03 02:44:22,364 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2076735523] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-03 02:44:22,364 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 02:44:22,364 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [11] total 14 [2022-11-03 02:44:22,364 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [949320023] [2022-11-03 02:44:22,364 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:44:22,365 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-03 02:44:22,365 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 02:44:22,365 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-03 02:44:22,365 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=150, Unknown=0, NotChecked=0, Total=182 [2022-11-03 02:44:22,366 INFO L87 Difference]: Start difference. First operand 85 states and 110 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-03 02:44:29,346 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.15s for a HTC check with result INVALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-11-03 02:44:29,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:44:29,926 INFO L93 Difference]: Finished difference Result 112 states and 151 transitions. [2022-11-03 02:44:29,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-03 02:44:29,938 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 43 [2022-11-03 02:44:29,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:44:29,939 INFO L225 Difference]: With dead ends: 112 [2022-11-03 02:44:29,939 INFO L226 Difference]: Without dead ends: 110 [2022-11-03 02:44:29,939 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=36, Invalid=174, Unknown=0, NotChecked=0, Total=210 [2022-11-03 02:44:29,940 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 7 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.3s IncrementalHoareTripleChecker+Time [2022-11-03 02:44:29,940 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 124 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 7.3s Time] [2022-11-03 02:44:29,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2022-11-03 02:44:29,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 107. [2022-11-03 02:44:29,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 71 states have (on average 1.2535211267605635) internal successors, (89), 72 states have internal predecessors, (89), 29 states have call successors, (29), 6 states have call predecessors, (29), 6 states have return successors, (28), 28 states have call predecessors, (28), 28 states have call successors, (28) [2022-11-03 02:44:29,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 146 transitions. [2022-11-03 02:44:29,969 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 146 transitions. Word has length 43 [2022-11-03 02:44:29,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:44:29,969 INFO L495 AbstractCegarLoop]: Abstraction has 107 states and 146 transitions. [2022-11-03 02:44:29,970 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-03 02:44:29,970 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 146 transitions. [2022-11-03 02:44:29,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-11-03 02:44:29,971 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:44:29,971 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 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] [2022-11-03 02:44:29,992 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2022-11-03 02:44:30,189 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 [2022-11-03 02:44:30,190 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:44:30,190 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:44:30,190 INFO L85 PathProgramCache]: Analyzing trace with hash -2141198011, now seen corresponding path program 1 times [2022-11-03 02:44:30,190 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 02:44:30,190 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1015022188] [2022-11-03 02:44:30,191 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:44:30,191 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 02:44:30,191 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 02:44:30,192 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 02:44:30,194 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_719c45af-6816-4e34-8dee-557c00647378/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2022-11-03 02:44:30,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:44:30,483 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 29 conjunts are in the unsatisfiable core [2022-11-03 02:44:30,485 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:44:32,474 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 2 proven. 13 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 02:44:32,474 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:45:26,541 WARN L234 SmtUtils]: Spent 7.79s on a formula simplification that was a NOOP. DAG size: 26 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)