./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound20.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 38b53e6a 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_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound20.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur --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 39b854852f8258ff198098e27d83a5b0e296df48090ebea0d59d234417af0752 --- 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-38b53e6 [2022-11-26 00:29:59,979 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-26 00:29:59,981 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-26 00:30:00,000 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-26 00:30:00,001 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-26 00:30:00,002 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-26 00:30:00,003 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-26 00:30:00,005 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-26 00:30:00,006 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-26 00:30:00,007 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-26 00:30:00,008 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-26 00:30:00,010 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-26 00:30:00,010 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-26 00:30:00,011 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-26 00:30:00,012 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-26 00:30:00,013 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-26 00:30:00,014 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-26 00:30:00,015 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-26 00:30:00,017 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-26 00:30:00,019 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-26 00:30:00,020 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-26 00:30:00,021 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-26 00:30:00,023 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-26 00:30:00,024 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-26 00:30:00,027 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-26 00:30:00,028 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-26 00:30:00,028 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-26 00:30:00,029 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-26 00:30:00,030 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-26 00:30:00,031 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-26 00:30:00,031 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-26 00:30:00,032 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-26 00:30:00,033 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-26 00:30:00,034 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-26 00:30:00,035 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-26 00:30:00,035 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-26 00:30:00,036 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-26 00:30:00,036 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-26 00:30:00,036 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-26 00:30:00,037 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-26 00:30:00,038 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-26 00:30:00,039 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-26 00:30:00,063 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-26 00:30:00,063 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-26 00:30:00,063 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-26 00:30:00,063 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-26 00:30:00,064 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-26 00:30:00,064 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-26 00:30:00,064 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-26 00:30:00,065 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-26 00:30:00,065 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-26 00:30:00,065 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-26 00:30:00,065 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-26 00:30:00,065 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-26 00:30:00,065 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-26 00:30:00,066 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-26 00:30:00,066 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-26 00:30:00,066 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-26 00:30:00,066 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-26 00:30:00,066 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-26 00:30:00,067 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-26 00:30:00,067 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-26 00:30:00,067 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-26 00:30:00,068 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-26 00:30:00,068 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-26 00:30:00,068 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-26 00:30:00,068 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-26 00:30:00,068 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-26 00:30:00,068 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-26 00:30:00,069 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-26 00:30:00,069 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-26 00:30:00,069 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-26 00:30:00,069 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-26 00:30:00,069 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-26 00:30:00,069 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-26 00:30:00,070 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-26 00:30:00,070 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-26 00:30:00,070 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-26 00:30:00,070 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-26 00:30:00,070 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-26 00:30:00,071 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-26 00:30:00,071 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-26 00:30:00,071 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-26 00:30:00,071 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_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 39b854852f8258ff198098e27d83a5b0e296df48090ebea0d59d234417af0752 [2022-11-26 00:30:00,392 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-26 00:30:00,426 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-26 00:30:00,429 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-26 00:30:00,430 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-26 00:30:00,431 INFO L275 PluginConnector]: CDTParser initialized [2022-11-26 00:30:00,432 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound20.c [2022-11-26 00:30:03,528 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-26 00:30:03,755 INFO L351 CDTParser]: Found 1 translation units. [2022-11-26 00:30:03,756 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound20.c [2022-11-26 00:30:03,763 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/data/266a043b2/8352958fe9eb484f880e362a04553cc7/FLAG94312ea80 [2022-11-26 00:30:03,779 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/data/266a043b2/8352958fe9eb484f880e362a04553cc7 [2022-11-26 00:30:03,782 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-26 00:30:03,784 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-26 00:30:03,785 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-26 00:30:03,786 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-26 00:30:03,790 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-26 00:30:03,791 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.11 12:30:03" (1/1) ... [2022-11-26 00:30:03,792 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@682dab00 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:30:03, skipping insertion in model container [2022-11-26 00:30:03,792 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.11 12:30:03" (1/1) ... [2022-11-26 00:30:03,806 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-26 00:30:03,825 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-26 00:30:04,049 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound20.c[490,503] [2022-11-26 00:30:04,069 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-26 00:30:04,079 INFO L203 MainTranslator]: Completed pre-run [2022-11-26 00:30:04,091 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound20.c[490,503] [2022-11-26 00:30:04,100 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-26 00:30:04,116 INFO L208 MainTranslator]: Completed translation [2022-11-26 00:30:04,117 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:30:04 WrapperNode [2022-11-26 00:30:04,117 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-26 00:30:04,118 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-26 00:30:04,118 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-26 00:30:04,119 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-26 00:30:04,126 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:30:04" (1/1) ... [2022-11-26 00:30:04,132 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:30:04" (1/1) ... [2022-11-26 00:30:04,151 INFO L138 Inliner]: procedures = 14, calls = 16, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 80 [2022-11-26 00:30:04,151 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-26 00:30:04,152 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-26 00:30:04,152 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-26 00:30:04,152 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-26 00:30:04,162 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:30:04" (1/1) ... [2022-11-26 00:30:04,163 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:30:04" (1/1) ... [2022-11-26 00:30:04,176 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:30:04" (1/1) ... [2022-11-26 00:30:04,176 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:30:04" (1/1) ... [2022-11-26 00:30:04,179 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:30:04" (1/1) ... [2022-11-26 00:30:04,183 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:30:04" (1/1) ... [2022-11-26 00:30:04,184 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:30:04" (1/1) ... [2022-11-26 00:30:04,185 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:30:04" (1/1) ... [2022-11-26 00:30:04,187 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-26 00:30:04,188 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-26 00:30:04,188 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-26 00:30:04,188 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-26 00:30:04,189 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:30:04" (1/1) ... [2022-11-26 00:30:04,196 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-26 00:30:04,208 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:30:04,222 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-26 00:30:04,252 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-26 00:30:04,276 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-26 00:30:04,277 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-11-26 00:30:04,277 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-11-26 00:30:04,278 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-26 00:30:04,278 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-26 00:30:04,278 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-26 00:30:04,278 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-26 00:30:04,278 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-26 00:30:04,357 INFO L235 CfgBuilder]: Building ICFG [2022-11-26 00:30:04,360 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-26 00:30:04,514 INFO L276 CfgBuilder]: Performing block encoding [2022-11-26 00:30:04,538 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-26 00:30:04,538 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-11-26 00:30:04,541 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.11 12:30:04 BoogieIcfgContainer [2022-11-26 00:30:04,541 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-26 00:30:04,544 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-26 00:30:04,544 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-26 00:30:04,548 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-26 00:30:04,548 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.11 12:30:03" (1/3) ... [2022-11-26 00:30:04,549 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@58fe0a7e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.11 12:30:04, skipping insertion in model container [2022-11-26 00:30:04,549 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:30:04" (2/3) ... [2022-11-26 00:30:04,549 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@58fe0a7e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.11 12:30:04, skipping insertion in model container [2022-11-26 00:30:04,549 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.11 12:30:04" (3/3) ... [2022-11-26 00:30:04,551 INFO L112 eAbstractionObserver]: Analyzing ICFG egcd3-ll_valuebound20.c [2022-11-26 00:30:04,572 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-26 00:30:04,572 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-26 00:30:04,631 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-26 00:30:04,638 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;@15b9a5e, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-26 00:30:04,639 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-26 00:30:04,643 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) [2022-11-26 00:30:04,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-26 00:30:04,652 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:30:04,652 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:30:04,653 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:30:04,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:30:04,659 INFO L85 PathProgramCache]: Analyzing trace with hash 1539547475, now seen corresponding path program 1 times [2022-11-26 00:30:04,669 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:30:04,670 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1678995134] [2022-11-26 00:30:04,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:30:04,670 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:30:04,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:30:04,854 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:30:04,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1678995134] [2022-11-26 00:30:04,855 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2022-11-26 00:30:04,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1270288956] [2022-11-26 00:30:04,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:30:04,856 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:30:04,856 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:30:04,862 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:30:04,883 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-26 00:30:04,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:30:04,967 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 1 conjunts are in the unsatisfiable core [2022-11-26 00:30:04,973 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:30:05,033 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-26 00:30:05,033 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-26 00:30:05,034 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1270288956] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 00:30:05,034 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-26 00:30:05,035 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-26 00:30:05,037 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1212210631] [2022-11-26 00:30:05,038 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 00:30:05,058 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-26 00:30:05,059 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:30:05,112 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-26 00:30:05,113 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-26 00:30:05,115 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) [2022-11-26 00:30:05,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:30:05,188 INFO L93 Difference]: Finished difference Result 51 states and 79 transitions. [2022-11-26 00:30:05,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-26 00:30:05,198 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 [2022-11-26 00:30:05,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:30:05,206 INFO L225 Difference]: With dead ends: 51 [2022-11-26 00:30:05,206 INFO L226 Difference]: Without dead ends: 28 [2022-11-26 00:30:05,209 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 [2022-11-26 00:30:05,213 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 [2022-11-26 00:30:05,214 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] [2022-11-26 00:30:05,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-11-26 00:30:05,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2022-11-26 00:30:05,250 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) [2022-11-26 00:30:05,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 37 transitions. [2022-11-26 00:30:05,253 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 37 transitions. Word has length 20 [2022-11-26 00:30:05,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:30:05,256 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 37 transitions. [2022-11-26 00:30:05,256 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) [2022-11-26 00:30:05,257 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 37 transitions. [2022-11-26 00:30:05,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-26 00:30:05,259 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:30:05,259 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:30:05,272 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-26 00:30:05,473 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2022-11-26 00:30:05,473 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:30:05,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:30:05,474 INFO L85 PathProgramCache]: Analyzing trace with hash 1863391506, now seen corresponding path program 1 times [2022-11-26 00:30:05,474 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:30:05,475 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [696711363] [2022-11-26 00:30:05,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:30:05,475 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:30:05,494 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-26 00:30:05,495 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1886081801] [2022-11-26 00:30:05,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:30:05,495 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:30:05,495 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:30:05,497 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:30:05,502 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-26 00:30:05,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:30:05,569 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-26 00:30:05,572 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:30:05,668 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-26 00:30:05,674 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-26 00:30:05,674 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:30:05,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [696711363] [2022-11-26 00:30:05,675 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-26 00:30:05,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1886081801] [2022-11-26 00:30:05,676 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1886081801] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 00:30:05,676 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-26 00:30:05,676 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-26 00:30:05,676 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [844411547] [2022-11-26 00:30:05,677 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 00:30:05,677 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-26 00:30:05,678 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:30:05,678 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-26 00:30:05,681 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-26 00:30:05,681 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) [2022-11-26 00:30:05,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:30:05,861 INFO L93 Difference]: Finished difference Result 47 states and 62 transitions. [2022-11-26 00:30:05,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-26 00:30:05,867 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 [2022-11-26 00:30:05,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:30:05,868 INFO L225 Difference]: With dead ends: 47 [2022-11-26 00:30:05,868 INFO L226 Difference]: Without dead ends: 40 [2022-11-26 00:30:05,868 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 [2022-11-26 00:30:05,870 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 30 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-26 00:30:05,870 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 78 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-26 00:30:05,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-11-26 00:30:05,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 30. [2022-11-26 00:30:05,886 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) [2022-11-26 00:30:05,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 39 transitions. [2022-11-26 00:30:05,887 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 39 transitions. Word has length 21 [2022-11-26 00:30:05,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:30:05,888 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 39 transitions. [2022-11-26 00:30:05,888 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) [2022-11-26 00:30:05,888 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 39 transitions. [2022-11-26 00:30:05,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-26 00:30:05,889 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:30:05,889 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] [2022-11-26 00:30:05,899 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-26 00:30:06,093 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:30:06,093 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:30:06,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:30:06,094 INFO L85 PathProgramCache]: Analyzing trace with hash -73319670, now seen corresponding path program 1 times [2022-11-26 00:30:06,094 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:30:06,098 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1939830670] [2022-11-26 00:30:06,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:30:06,099 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:30:06,128 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-26 00:30:06,128 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [308774796] [2022-11-26 00:30:06,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:30:06,129 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:30:06,129 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:30:06,138 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:30:06,139 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-26 00:30:06,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:30:06,195 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-26 00:30:06,198 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:30:06,337 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-26 00:30:06,337 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-26 00:30:06,337 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:30:06,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1939830670] [2022-11-26 00:30:06,338 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-26 00:30:06,338 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [308774796] [2022-11-26 00:30:06,338 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [308774796] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 00:30:06,338 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-26 00:30:06,338 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-11-26 00:30:06,339 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1940254254] [2022-11-26 00:30:06,339 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 00:30:06,339 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-26 00:30:06,340 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:30:06,340 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-26 00:30:06,341 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-26 00:30:06,341 INFO L87 Difference]: Start difference. First operand 30 states and 39 transitions. Second operand has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 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) [2022-11-26 00:30:06,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:30:06,459 INFO L93 Difference]: Finished difference Result 46 states and 60 transitions. [2022-11-26 00:30:06,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-26 00:30:06,460 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 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 24 [2022-11-26 00:30:06,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:30:06,462 INFO L225 Difference]: With dead ends: 46 [2022-11-26 00:30:06,462 INFO L226 Difference]: Without dead ends: 44 [2022-11-26 00:30:06,462 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2022-11-26 00:30:06,464 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 25 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-26 00:30:06,464 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 114 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-26 00:30:06,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-11-26 00:30:06,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2022-11-26 00:30:06,476 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) [2022-11-26 00:30:06,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 57 transitions. [2022-11-26 00:30:06,478 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 57 transitions. Word has length 24 [2022-11-26 00:30:06,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:30:06,479 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 57 transitions. [2022-11-26 00:30:06,479 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 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) [2022-11-26 00:30:06,479 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 57 transitions. [2022-11-26 00:30:06,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-26 00:30:06,480 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:30:06,480 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] [2022-11-26 00:30:06,491 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-26 00:30:06,687 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:30:06,687 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:30:06,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:30:06,688 INFO L85 PathProgramCache]: Analyzing trace with hash -1101454984, now seen corresponding path program 1 times [2022-11-26 00:30:06,688 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:30:06,689 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [407075271] [2022-11-26 00:30:06,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:30:06,691 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:30:06,724 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-26 00:30:06,736 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1580934262] [2022-11-26 00:30:06,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:30:06,737 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:30:06,737 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:30:06,742 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:30:06,744 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-26 00:30:06,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:30:06,847 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-26 00:30:06,857 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:30:06,952 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-26 00:30:06,952 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:30:07,085 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-26 00:30:07,085 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:30:07,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [407075271] [2022-11-26 00:30:07,086 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-26 00:30:07,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1580934262] [2022-11-26 00:30:07,086 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1580934262] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:30:07,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [223051040] [2022-11-26 00:30:07,117 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-26 00:30:07,117 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:30:07,121 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:30:07,126 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:30:07,126 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:30:08,043 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-26 00:30:08,081 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:30:10,110 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [223051040] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 00:30:10,111 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-26 00:30:10,111 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [7, 7] total 18 [2022-11-26 00:30:10,112 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [783831965] [2022-11-26 00:30:10,112 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 00:30:10,112 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-26 00:30:10,112 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:30:10,113 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-26 00:30:10,113 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=214, Unknown=0, NotChecked=0, Total=306 [2022-11-26 00:30:10,113 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) [2022-11-26 00:30:10,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:30:10,487 INFO L93 Difference]: Finished difference Result 71 states and 97 transitions. [2022-11-26 00:30:10,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-26 00:30:10,488 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 [2022-11-26 00:30:10,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:30:10,489 INFO L225 Difference]: With dead ends: 71 [2022-11-26 00:30:10,489 INFO L226 Difference]: Without dead ends: 64 [2022-11-26 00:30:10,489 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 54 SyntacticMatches, 6 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=92, Invalid=214, Unknown=0, NotChecked=0, Total=306 [2022-11-26 00:30:10,490 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 41 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 153 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 174 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 153 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-26 00:30:10,491 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [49 Valid, 58 Invalid, 174 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 153 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-26 00:30:10,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2022-11-26 00:30:10,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 50. [2022-11-26 00:30:10,527 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) [2022-11-26 00:30:10,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 66 transitions. [2022-11-26 00:30:10,533 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 66 transitions. Word has length 26 [2022-11-26 00:30:10,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:30:10,533 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 66 transitions. [2022-11-26 00:30:10,533 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) [2022-11-26 00:30:10,533 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 66 transitions. [2022-11-26 00:30:10,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-26 00:30:10,535 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:30:10,535 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] [2022-11-26 00:30:10,542 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-26 00:30:10,742 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:30:10,742 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:30:10,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:30:10,742 INFO L85 PathProgramCache]: Analyzing trace with hash -156943002, now seen corresponding path program 1 times [2022-11-26 00:30:10,743 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:30:10,743 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1549260160] [2022-11-26 00:30:10,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:30:10,743 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:30:10,757 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-26 00:30:10,757 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1693037859] [2022-11-26 00:30:10,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:30:10,758 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:30:10,758 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:30:10,759 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:30:10,779 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-26 00:30:10,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:30:10,839 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-26 00:30:10,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:30:10,929 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-26 00:30:10,929 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:30:11,013 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:30:11,013 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1549260160] [2022-11-26 00:30:11,013 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-26 00:30:11,013 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1693037859] [2022-11-26 00:30:11,014 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1693037859] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:30:11,014 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [997254090] [2022-11-26 00:30:11,017 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2022-11-26 00:30:11,017 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:30:11,017 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:30:11,018 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:30:11,019 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:30:11,490 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 38 for LOIs [2022-11-26 00:30:11,500 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-26 00:30:11,519 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:30:12,881 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [997254090] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 00:30:12,881 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-26 00:30:12,881 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [7] total 20 [2022-11-26 00:30:12,882 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [178981750] [2022-11-26 00:30:12,882 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 00:30:12,882 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-26 00:30:12,882 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:30:12,883 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-26 00:30:12,883 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=393, Unknown=0, NotChecked=0, Total=506 [2022-11-26 00:30:12,883 INFO L87 Difference]: Start difference. First operand 50 states and 66 transitions. Second operand has 15 states, 10 states have (on average 1.4) internal successors, (14), 8 states have internal predecessors, (14), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-26 00:30:13,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:30:13,300 INFO L93 Difference]: Finished difference Result 72 states and 97 transitions. [2022-11-26 00:30:13,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-26 00:30:13,301 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 10 states have (on average 1.4) internal successors, (14), 8 states have internal predecessors, (14), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 29 [2022-11-26 00:30:13,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:30:13,302 INFO L225 Difference]: With dead ends: 72 [2022-11-26 00:30:13,302 INFO L226 Difference]: Without dead ends: 70 [2022-11-26 00:30:13,303 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 38 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 146 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=113, Invalid=393, Unknown=0, NotChecked=0, Total=506 [2022-11-26 00:30:13,304 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 74 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 222 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 270 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 222 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-26 00:30:13,304 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [89 Valid, 57 Invalid, 270 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 222 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-26 00:30:13,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2022-11-26 00:30:13,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 65. [2022-11-26 00:30:13,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 41 states have internal predecessors, (48), 21 states have call successors, (21), 4 states have call predecessors, (21), 4 states have return successors, (20), 19 states have call predecessors, (20), 20 states have call successors, (20) [2022-11-26 00:30:13,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 89 transitions. [2022-11-26 00:30:13,369 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 89 transitions. Word has length 29 [2022-11-26 00:30:13,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:30:13,371 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 89 transitions. [2022-11-26 00:30:13,373 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 10 states have (on average 1.4) internal successors, (14), 8 states have internal predecessors, (14), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-26 00:30:13,373 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 89 transitions. [2022-11-26 00:30:13,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-26 00:30:13,374 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:30:13,374 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] [2022-11-26 00:30:13,387 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-26 00:30:13,579 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:30:13,580 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:30:13,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:30:13,581 INFO L85 PathProgramCache]: Analyzing trace with hash 187338980, now seen corresponding path program 1 times [2022-11-26 00:30:13,581 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:30:13,581 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [320787997] [2022-11-26 00:30:13,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:30:13,581 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:30:13,605 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-26 00:30:13,605 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1151646702] [2022-11-26 00:30:13,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:30:13,605 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:30:13,606 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:30:13,613 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:30:13,615 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-26 00:30:13,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:30:13,675 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 25 conjunts are in the unsatisfiable core [2022-11-26 00:30:13,677 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:30:13,825 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-26 00:30:13,825 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:30:14,020 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-26 00:30:14,020 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:30:14,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [320787997] [2022-11-26 00:30:14,021 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-26 00:30:14,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1151646702] [2022-11-26 00:30:14,021 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1151646702] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:30:14,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [274650918] [2022-11-26 00:30:14,028 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-11-26 00:30:14,028 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:30:14,029 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:30:14,029 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:30:14,029 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:30:14,791 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 38 for LOIs [2022-11-26 00:30:14,797 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-26 00:30:14,814 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:30:17,205 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [274650918] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 00:30:17,205 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-26 00:30:17,205 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [8, 6] total 26 [2022-11-26 00:30:17,206 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1436121834] [2022-11-26 00:30:17,206 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 00:30:17,206 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-26 00:30:17,207 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:30:17,207 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-26 00:30:17,208 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=525, Unknown=0, NotChecked=0, Total=650 [2022-11-26 00:30:17,208 INFO L87 Difference]: Start difference. First operand 65 states and 89 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) [2022-11-26 00:30:17,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:30:17,796 INFO L93 Difference]: Finished difference Result 96 states and 128 transitions. [2022-11-26 00:30:17,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-26 00:30:17,797 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 [2022-11-26 00:30:17,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:30:17,799 INFO L225 Difference]: With dead ends: 96 [2022-11-26 00:30:17,799 INFO L226 Difference]: Without dead ends: 94 [2022-11-26 00:30:17,800 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 59 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 163 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=125, Invalid=525, Unknown=0, NotChecked=0, Total=650 [2022-11-26 00:30:17,800 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 55 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 245 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 284 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 245 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-26 00:30:17,801 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [67 Valid, 56 Invalid, 284 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 245 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-26 00:30:17,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2022-11-26 00:30:17,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 88. [2022-11-26 00:30:17,846 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) [2022-11-26 00:30:17,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 118 transitions. [2022-11-26 00:30:17,847 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 118 transitions. Word has length 29 [2022-11-26 00:30:17,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:30:17,848 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 118 transitions. [2022-11-26 00:30:17,848 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) [2022-11-26 00:30:17,848 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 118 transitions. [2022-11-26 00:30:17,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-11-26 00:30:17,850 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:30:17,850 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] [2022-11-26 00:30:17,867 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-11-26 00:30:18,055 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-26 00:30:18,056 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:30:18,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:30:18,056 INFO L85 PathProgramCache]: Analyzing trace with hash -1193022788, now seen corresponding path program 1 times [2022-11-26 00:30:18,056 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:30:18,057 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [539083513] [2022-11-26 00:30:18,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:30:18,057 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:30:18,081 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-26 00:30:18,081 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1592172364] [2022-11-26 00:30:18,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:30:18,082 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:30:18,082 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:30:18,083 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:30:18,087 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-26 00:30:18,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:30:18,148 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 65 conjunts are in the unsatisfiable core [2022-11-26 00:30:18,151 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:30:18,995 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 8 proven. 19 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-26 00:30:18,996 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:30:20,374 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 8 proven. 16 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-26 00:30:20,377 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:30:20,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [539083513] [2022-11-26 00:30:20,379 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-26 00:30:20,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1592172364] [2022-11-26 00:30:20,379 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1592172364] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:30:20,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1104122619] [2022-11-26 00:30:20,381 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-26 00:30:20,381 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:30:20,382 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:30:20,382 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:30:20,382 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:30:29,451 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-26 00:30:29,455 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-26 00:30:29,469 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:30:40,243 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2087#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:30:40,243 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:30:40,243 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-26 00:30:40,243 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 13] total 26 [2022-11-26 00:30:40,243 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1847373419] [2022-11-26 00:30:40,243 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-26 00:30:40,244 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-26 00:30:40,244 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:30:40,245 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-26 00:30:40,246 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=217, Invalid=1853, Unknown=0, NotChecked=0, Total=2070 [2022-11-26 00:30:40,246 INFO L87 Difference]: Start difference. First operand 88 states and 118 transitions. Second operand has 26 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 21 states have internal predecessors, (43), 9 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 5 states have call predecessors, (14), 7 states have call successors, (14) [2022-11-26 00:30:53,621 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 [] [2022-11-26 00:30:56,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:30:56,272 INFO L93 Difference]: Finished difference Result 211 states and 299 transitions. [2022-11-26 00:30:56,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-11-26 00:30:56,272 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 21 states have internal predecessors, (43), 9 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 5 states have call predecessors, (14), 7 states have call successors, (14) Word has length 51 [2022-11-26 00:30:56,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:30:56,276 INFO L225 Difference]: With dead ends: 211 [2022-11-26 00:30:56,276 INFO L226 Difference]: Without dead ends: 173 [2022-11-26 00:30:56,278 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 104 SyntacticMatches, 6 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1730 ImplicationChecksByTransitivity, 20.2s TimeCoverageRelationStatistics Valid=554, Invalid=4276, Unknown=0, NotChecked=0, Total=4830 [2022-11-26 00:30:56,279 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 139 mSDsluCounter, 172 mSDsCounter, 0 mSdLazyCounter, 1219 mSolverCounterSat, 207 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 153 SdHoareTripleChecker+Valid, 196 SdHoareTripleChecker+Invalid, 1427 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 207 IncrementalHoareTripleChecker+Valid, 1219 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.5s IncrementalHoareTripleChecker+Time [2022-11-26 00:30:56,280 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [153 Valid, 196 Invalid, 1427 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [207 Valid, 1219 Invalid, 1 Unknown, 0 Unchecked, 7.5s Time] [2022-11-26 00:30:56,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2022-11-26 00:30:56,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 137. [2022-11-26 00:30:56,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 87 states have (on average 1.2413793103448276) internal successors, (108), 88 states have internal predecessors, (108), 41 states have call successors, (41), 8 states have call predecessors, (41), 8 states have return successors, (40), 40 states have call predecessors, (40), 40 states have call successors, (40) [2022-11-26 00:30:56,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 189 transitions. [2022-11-26 00:30:56,396 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 189 transitions. Word has length 51 [2022-11-26 00:30:56,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:30:56,397 INFO L495 AbstractCegarLoop]: Abstraction has 137 states and 189 transitions. [2022-11-26 00:30:56,397 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 21 states have internal predecessors, (43), 9 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 5 states have call predecessors, (14), 7 states have call successors, (14) [2022-11-26 00:30:56,398 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 189 transitions. [2022-11-26 00:30:56,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-11-26 00:30:56,404 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:30:56,405 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] [2022-11-26 00:30:56,415 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-26 00:30:56,610 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-11-26 00:30:56,610 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:30:56,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:30:56,611 INFO L85 PathProgramCache]: Analyzing trace with hash -900294476, now seen corresponding path program 1 times [2022-11-26 00:30:56,611 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:30:56,611 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1700393178] [2022-11-26 00:30:56,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:30:56,611 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:30:56,622 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-26 00:30:56,622 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1588212176] [2022-11-26 00:30:56,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:30:56,623 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:30:56,623 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:30:56,624 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:30:56,635 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-26 00:30:56,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:30:56,681 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-26 00:30:56,683 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:30:56,719 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-11-26 00:30:56,719 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-26 00:30:56,719 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:30:56,719 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1700393178] [2022-11-26 00:30:56,719 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-26 00:30:56,719 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1588212176] [2022-11-26 00:30:56,719 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1588212176] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 00:30:56,720 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-26 00:30:56,720 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-26 00:30:56,720 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [690089918] [2022-11-26 00:30:56,720 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 00:30:56,720 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-26 00:30:56,720 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:30:56,721 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-26 00:30:56,721 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-26 00:30:56,721 INFO L87 Difference]: Start difference. First operand 137 states and 189 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) [2022-11-26 00:30:56,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:30:56,888 INFO L93 Difference]: Finished difference Result 229 states and 321 transitions. [2022-11-26 00:30:56,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-26 00:30:56,888 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 [2022-11-26 00:30:56,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:30:56,890 INFO L225 Difference]: With dead ends: 229 [2022-11-26 00:30:56,890 INFO L226 Difference]: Without dead ends: 166 [2022-11-26 00:30:56,891 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 [2022-11-26 00:30:56,892 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 3 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-26 00:30:56,892 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 106 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-26 00:30:56,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2022-11-26 00:30:56,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 155. [2022-11-26 00:30:56,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 93 states have (on average 1.2365591397849462) internal successors, (115), 94 states have internal predecessors, (115), 53 states have call successors, (53), 8 states have call predecessors, (53), 8 states have return successors, (52), 52 states have call predecessors, (52), 52 states have call successors, (52) [2022-11-26 00:30:56,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 220 transitions. [2022-11-26 00:30:56,983 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 220 transitions. Word has length 54 [2022-11-26 00:30:56,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:30:56,984 INFO L495 AbstractCegarLoop]: Abstraction has 155 states and 220 transitions. [2022-11-26 00:30:56,984 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) [2022-11-26 00:30:56,984 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 220 transitions. [2022-11-26 00:30:56,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-11-26 00:30:56,994 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:30:56,994 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] [2022-11-26 00:30:57,005 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-26 00:30:57,200 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2022-11-26 00:30:57,201 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:30:57,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:30:57,201 INFO L85 PathProgramCache]: Analyzing trace with hash 1047855047, now seen corresponding path program 1 times [2022-11-26 00:30:57,201 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:30:57,202 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [803798723] [2022-11-26 00:30:57,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:30:57,202 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:30:57,216 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-26 00:30:57,216 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [27989732] [2022-11-26 00:30:57,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:30:57,217 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:30:57,217 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:30:57,218 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:30:57,225 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-26 00:30:57,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:30:57,277 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-26 00:30:57,279 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:30:57,444 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 25 proven. 15 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2022-11-26 00:30:57,444 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:30:57,575 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 27 proven. 10 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-11-26 00:30:57,575 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:30:57,576 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [803798723] [2022-11-26 00:30:57,576 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-26 00:30:57,576 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [27989732] [2022-11-26 00:30:57,576 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [27989732] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:30:57,576 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1946877230] [2022-11-26 00:30:57,578 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-26 00:30:57,578 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:30:57,579 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:30:57,579 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:30:57,579 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:31:04,073 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-26 00:31:04,077 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-26 00:31:04,091 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:31:05,955 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3841#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:31:05,956 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:31:05,956 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-26 00:31:05,956 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 6] total 14 [2022-11-26 00:31:05,956 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1484504386] [2022-11-26 00:31:05,956 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-26 00:31:05,957 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-26 00:31:05,957 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:31:05,957 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-26 00:31:05,958 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=741, Unknown=0, NotChecked=0, Total=870 [2022-11-26 00:31:05,958 INFO L87 Difference]: Start difference. First operand 155 states and 220 transitions. Second operand has 14 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 12 states have internal predecessors, (33), 4 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (19), 5 states have call predecessors, (19), 4 states have call successors, (19) [2022-11-26 00:31:06,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:31:06,620 INFO L93 Difference]: Finished difference Result 198 states and 272 transitions. [2022-11-26 00:31:06,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-26 00:31:06,621 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 12 states have internal predecessors, (33), 4 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (19), 5 states have call predecessors, (19), 4 states have call successors, (19) Word has length 61 [2022-11-26 00:31:06,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:31:06,623 INFO L225 Difference]: With dead ends: 198 [2022-11-26 00:31:06,623 INFO L226 Difference]: Without dead ends: 196 [2022-11-26 00:31:06,624 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 156 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 329 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=180, Invalid=1152, Unknown=0, NotChecked=0, Total=1332 [2022-11-26 00:31:06,624 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 56 mSDsluCounter, 111 mSDsCounter, 0 mSdLazyCounter, 447 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 479 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 447 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-26 00:31:06,625 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [56 Valid, 136 Invalid, 479 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 447 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-26 00:31:06,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2022-11-26 00:31:06,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 167. [2022-11-26 00:31:06,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 102 states have (on average 1.2156862745098038) internal successors, (124), 103 states have internal predecessors, (124), 53 states have call successors, (53), 11 states have call predecessors, (53), 11 states have return successors, (52), 52 states have call predecessors, (52), 52 states have call successors, (52) [2022-11-26 00:31:06,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 229 transitions. [2022-11-26 00:31:06,736 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 229 transitions. Word has length 61 [2022-11-26 00:31:06,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:31:06,737 INFO L495 AbstractCegarLoop]: Abstraction has 167 states and 229 transitions. [2022-11-26 00:31:06,737 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 12 states have internal predecessors, (33), 4 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (19), 5 states have call predecessors, (19), 4 states have call successors, (19) [2022-11-26 00:31:06,737 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 229 transitions. [2022-11-26 00:31:06,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-11-26 00:31:06,738 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:31:06,739 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] [2022-11-26 00:31:06,743 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-26 00:31:06,940 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:31:06,941 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:31:06,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:31:06,941 INFO L85 PathProgramCache]: Analyzing trace with hash -94425734, now seen corresponding path program 2 times [2022-11-26 00:31:06,941 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:31:06,941 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [675118003] [2022-11-26 00:31:06,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:31:06,941 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:31:06,952 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-26 00:31:06,952 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [126566960] [2022-11-26 00:31:06,952 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 00:31:06,952 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:31:06,952 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:31:06,953 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:31:06,960 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-26 00:31:07,022 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-26 00:31:07,022 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:31:07,023 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 46 conjunts are in the unsatisfiable core [2022-11-26 00:31:07,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:31:07,605 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 11 proven. 21 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2022-11-26 00:31:07,605 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:31:08,131 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 10 proven. 19 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-26 00:31:08,131 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:31:08,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [675118003] [2022-11-26 00:31:08,131 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-26 00:31:08,132 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [126566960] [2022-11-26 00:31:08,133 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [126566960] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:31:08,133 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1145594134] [2022-11-26 00:31:08,135 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-26 00:31:08,135 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:31:08,136 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:31:08,136 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:31:08,136 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:31:14,174 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 50 for LOIs [2022-11-26 00:31:14,230 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-26 00:31:14,242 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:31:18,918 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4812#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:31:18,918 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:31:18,918 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-26 00:31:18,918 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 26 [2022-11-26 00:31:18,918 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1836997967] [2022-11-26 00:31:18,919 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-26 00:31:18,919 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-26 00:31:18,919 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:31:18,920 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-26 00:31:18,920 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=215, Invalid=1765, Unknown=0, NotChecked=0, Total=1980 [2022-11-26 00:31:18,921 INFO L87 Difference]: Start difference. First operand 167 states and 229 transitions. Second operand has 26 states, 25 states have (on average 2.16) internal successors, (54), 23 states have internal predecessors, (54), 5 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (13), 4 states have call predecessors, (13), 3 states have call successors, (13) [2022-11-26 00:31:37,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:31:37,444 INFO L93 Difference]: Finished difference Result 450 states and 637 transitions. [2022-11-26 00:31:37,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-11-26 00:31:37,445 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.16) internal successors, (54), 23 states have internal predecessors, (54), 5 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (13), 4 states have call predecessors, (13), 3 states have call successors, (13) Word has length 59 [2022-11-26 00:31:37,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:31:37,447 INFO L225 Difference]: With dead ends: 450 [2022-11-26 00:31:37,448 INFO L226 Difference]: Without dead ends: 379 [2022-11-26 00:31:37,450 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 126 SyntacticMatches, 6 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2139 ImplicationChecksByTransitivity, 14.6s TimeCoverageRelationStatistics Valid=781, Invalid=5225, Unknown=0, NotChecked=0, Total=6006 [2022-11-26 00:31:37,451 INFO L413 NwaCegarLoop]: 73 mSDtfsCounter, 248 mSDsluCounter, 353 mSDsCounter, 0 mSdLazyCounter, 1157 mSolverCounterSat, 308 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 248 SdHoareTripleChecker+Valid, 426 SdHoareTripleChecker+Invalid, 1465 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 308 IncrementalHoareTripleChecker+Valid, 1157 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.7s IncrementalHoareTripleChecker+Time [2022-11-26 00:31:37,451 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [248 Valid, 426 Invalid, 1465 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [308 Valid, 1157 Invalid, 0 Unknown, 0 Unchecked, 8.7s Time] [2022-11-26 00:31:37,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 379 states. [2022-11-26 00:31:37,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 379 to 248. [2022-11-26 00:31:37,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 248 states, 156 states have (on average 1.2243589743589745) internal successors, (191), 157 states have internal predecessors, (191), 77 states have call successors, (77), 14 states have call predecessors, (77), 14 states have return successors, (76), 76 states have call predecessors, (76), 76 states have call successors, (76) [2022-11-26 00:31:37,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 344 transitions. [2022-11-26 00:31:37,624 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 344 transitions. Word has length 59 [2022-11-26 00:31:37,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:31:37,625 INFO L495 AbstractCegarLoop]: Abstraction has 248 states and 344 transitions. [2022-11-26 00:31:37,625 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 2.16) internal successors, (54), 23 states have internal predecessors, (54), 5 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (13), 4 states have call predecessors, (13), 3 states have call successors, (13) [2022-11-26 00:31:37,625 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 344 transitions. [2022-11-26 00:31:37,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-11-26 00:31:37,626 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:31:37,627 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] [2022-11-26 00:31:37,632 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-26 00:31:37,832 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:31:37,832 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:31:37,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:31:37,833 INFO L85 PathProgramCache]: Analyzing trace with hash -1223812978, now seen corresponding path program 3 times [2022-11-26 00:31:37,833 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:31:37,833 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1165350101] [2022-11-26 00:31:37,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:31:37,834 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:31:37,843 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-26 00:31:37,844 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1693353424] [2022-11-26 00:31:37,844 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 00:31:37,844 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:31:37,844 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:31:37,845 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:31:37,848 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-26 00:31:37,902 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 00:31:37,902 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:31:37,903 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-26 00:31:37,905 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:31:37,958 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 27 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-26 00:31:37,958 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:31:38,035 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 27 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-26 00:31:38,035 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:31:38,035 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1165350101] [2022-11-26 00:31:38,036 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-26 00:31:38,036 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1693353424] [2022-11-26 00:31:38,036 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1693353424] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:31:38,036 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [715077964] [2022-11-26 00:31:38,038 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-26 00:31:38,038 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:31:38,038 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:31:38,039 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:31:38,039 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:31:44,872 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-26 00:31:44,876 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-26 00:31:44,889 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:31:46,905 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6343#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:31:46,905 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:31:46,905 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-26 00:31:46,905 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2022-11-26 00:31:46,906 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [763494385] [2022-11-26 00:31:46,906 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-26 00:31:46,906 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-26 00:31:46,906 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:31:46,907 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-26 00:31:46,907 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=798, Unknown=0, NotChecked=0, Total=930 [2022-11-26 00:31:46,908 INFO L87 Difference]: Start difference. First operand 248 states and 344 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) [2022-11-26 00:31:47,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:31:47,511 INFO L93 Difference]: Finished difference Result 357 states and 500 transitions. [2022-11-26 00:31:47,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-26 00:31:47,512 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 [2022-11-26 00:31:47,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:31:47,514 INFO L225 Difference]: With dead ends: 357 [2022-11-26 00:31:47,514 INFO L226 Difference]: Without dead ends: 259 [2022-11-26 00:31:47,515 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 491 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=244, Invalid=1562, Unknown=0, NotChecked=0, Total=1806 [2022-11-26 00:31:47,516 INFO L413 NwaCegarLoop]: 57 mSDtfsCounter, 49 mSDsluCounter, 160 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 217 SdHoareTripleChecker+Invalid, 369 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-26 00:31:47,516 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [53 Valid, 217 Invalid, 369 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-26 00:31:47,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2022-11-26 00:31:47,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 229. [2022-11-26 00:31:47,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 229 states, 141 states have (on average 1.1914893617021276) internal successors, (168), 142 states have internal predecessors, (168), 73 states have call successors, (73), 14 states have call predecessors, (73), 14 states have return successors, (72), 72 states have call predecessors, (72), 72 states have call successors, (72) [2022-11-26 00:31:47,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 313 transitions. [2022-11-26 00:31:47,671 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 313 transitions. Word has length 59 [2022-11-26 00:31:47,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:31:47,671 INFO L495 AbstractCegarLoop]: Abstraction has 229 states and 313 transitions. [2022-11-26 00:31:47,672 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) [2022-11-26 00:31:47,672 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 313 transitions. [2022-11-26 00:31:47,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-11-26 00:31:47,673 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:31:47,673 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] [2022-11-26 00:31:47,679 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-11-26 00:31:47,878 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-26 00:31:47,878 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:31:47,879 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:31:47,879 INFO L85 PathProgramCache]: Analyzing trace with hash 255729376, now seen corresponding path program 4 times [2022-11-26 00:31:47,879 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:31:47,879 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1757469030] [2022-11-26 00:31:47,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:31:47,879 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:31:47,889 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-26 00:31:47,889 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1685077643] [2022-11-26 00:31:47,890 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-26 00:31:47,890 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:31:47,890 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:31:47,891 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:31:47,906 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-26 00:31:47,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:31:47,954 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-26 00:31:47,956 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:31:48,080 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 20 proven. 7 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2022-11-26 00:31:48,080 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:31:48,164 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 20 proven. 0 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2022-11-26 00:31:48,164 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:31:48,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1757469030] [2022-11-26 00:31:48,164 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-26 00:31:48,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1685077643] [2022-11-26 00:31:48,164 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1685077643] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-26 00:31:48,165 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-26 00:31:48,165 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [11] total 14 [2022-11-26 00:31:48,165 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1356302148] [2022-11-26 00:31:48,165 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 00:31:48,165 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-26 00:31:48,165 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:31:48,166 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-26 00:31:48,166 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2022-11-26 00:31:48,166 INFO L87 Difference]: Start difference. First operand 229 states and 313 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) [2022-11-26 00:31:48,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:31:48,389 INFO L93 Difference]: Finished difference Result 261 states and 358 transitions. [2022-11-26 00:31:48,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-26 00:31:48,389 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 [2022-11-26 00:31:48,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:31:48,391 INFO L225 Difference]: With dead ends: 261 [2022-11-26 00:31:48,392 INFO L226 Difference]: Without dead ends: 259 [2022-11-26 00:31:48,392 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2022-11-26 00:31:48,393 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 7 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-26 00:31:48,393 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 105 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-26 00:31:48,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2022-11-26 00:31:48,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 255. [2022-11-26 00:31:48,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 255 states, 153 states have (on average 1.196078431372549) internal successors, (183), 154 states have internal predecessors, (183), 85 states have call successors, (85), 16 states have call predecessors, (85), 16 states have return successors, (84), 84 states have call predecessors, (84), 84 states have call successors, (84) [2022-11-26 00:31:48,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 255 states to 255 states and 352 transitions. [2022-11-26 00:31:48,630 INFO L78 Accepts]: Start accepts. Automaton has 255 states and 352 transitions. Word has length 64 [2022-11-26 00:31:48,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:31:48,630 INFO L495 AbstractCegarLoop]: Abstraction has 255 states and 352 transitions. [2022-11-26 00:31:48,631 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) [2022-11-26 00:31:48,631 INFO L276 IsEmpty]: Start isEmpty. Operand 255 states and 352 transitions. [2022-11-26 00:31:48,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-11-26 00:31:48,632 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:31:48,632 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] [2022-11-26 00:31:48,637 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-26 00:31:48,833 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-26 00:31:48,833 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:31:48,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:31:48,834 INFO L85 PathProgramCache]: Analyzing trace with hash 1508724982, now seen corresponding path program 5 times [2022-11-26 00:31:48,834 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:31:48,834 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [840809220] [2022-11-26 00:31:48,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:31:48,834 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:31:48,842 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-26 00:31:48,842 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [152866454] [2022-11-26 00:31:48,842 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 00:31:48,843 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:31:48,843 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:31:48,844 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:31:48,848 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-26 00:31:48,904 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-26 00:31:48,904 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:31:48,906 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 63 conjunts are in the unsatisfiable core [2022-11-26 00:31:48,908 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:31:49,640 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 13 proven. 22 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2022-11-26 00:31:49,640 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:31:51,045 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 14 proven. 18 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2022-11-26 00:31:51,045 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:31:51,045 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [840809220] [2022-11-26 00:31:51,045 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-26 00:31:51,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [152866454] [2022-11-26 00:31:51,046 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [152866454] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:31:51,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1263292059] [2022-11-26 00:31:51,048 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-26 00:31:51,048 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:31:51,049 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:31:51,049 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:31:51,049 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:32:00,271 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-26 00:32:00,275 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-26 00:32:00,287 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:32:07,724 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8902#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:32:07,724 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:32:07,724 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-26 00:32:07,725 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 26 [2022-11-26 00:32:07,725 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1905398615] [2022-11-26 00:32:07,725 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-26 00:32:07,725 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-26 00:32:07,727 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:32:07,728 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-26 00:32:07,728 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=1768, Unknown=0, NotChecked=0, Total=1980 [2022-11-26 00:32:07,729 INFO L87 Difference]: Start difference. First operand 255 states and 352 transitions. Second operand has 26 states, 25 states have (on average 2.16) internal successors, (54), 23 states have internal predecessors, (54), 5 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (15), 6 states have call predecessors, (15), 5 states have call successors, (15) [2022-11-26 00:32:29,627 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.30s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-26 00:32:35,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:32:35,670 INFO L93 Difference]: Finished difference Result 395 states and 560 transitions. [2022-11-26 00:32:35,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-11-26 00:32:35,671 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.16) internal successors, (54), 23 states have internal predecessors, (54), 5 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (15), 6 states have call predecessors, (15), 5 states have call successors, (15) Word has length 64 [2022-11-26 00:32:35,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:32:35,673 INFO L225 Difference]: With dead ends: 395 [2022-11-26 00:32:35,673 INFO L226 Difference]: Without dead ends: 393 [2022-11-26 00:32:35,674 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 141 SyntacticMatches, 6 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1749 ImplicationChecksByTransitivity, 22.4s TimeCoverageRelationStatistics Valid=654, Invalid=4316, Unknown=0, NotChecked=0, Total=4970 [2022-11-26 00:32:35,675 INFO L413 NwaCegarLoop]: 62 mSDtfsCounter, 258 mSDsluCounter, 342 mSDsCounter, 0 mSdLazyCounter, 1434 mSolverCounterSat, 385 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 13.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 258 SdHoareTripleChecker+Valid, 404 SdHoareTripleChecker+Invalid, 1819 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 385 IncrementalHoareTripleChecker+Valid, 1434 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.9s IncrementalHoareTripleChecker+Time [2022-11-26 00:32:35,675 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [258 Valid, 404 Invalid, 1819 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [385 Valid, 1434 Invalid, 0 Unknown, 0 Unchecked, 13.9s Time] [2022-11-26 00:32:35,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 393 states. [2022-11-26 00:32:35,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 393 to 342. [2022-11-26 00:32:35,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 342 states, 202 states have (on average 1.2128712871287128) internal successors, (245), 203 states have internal predecessors, (245), 121 states have call successors, (121), 18 states have call predecessors, (121), 18 states have return successors, (120), 120 states have call predecessors, (120), 120 states have call successors, (120) [2022-11-26 00:32:35,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 342 states to 342 states and 486 transitions. [2022-11-26 00:32:35,933 INFO L78 Accepts]: Start accepts. Automaton has 342 states and 486 transitions. Word has length 64 [2022-11-26 00:32:35,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:32:35,933 INFO L495 AbstractCegarLoop]: Abstraction has 342 states and 486 transitions. [2022-11-26 00:32:35,933 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 2.16) internal successors, (54), 23 states have internal predecessors, (54), 5 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (15), 6 states have call predecessors, (15), 5 states have call successors, (15) [2022-11-26 00:32:35,933 INFO L276 IsEmpty]: Start isEmpty. Operand 342 states and 486 transitions. [2022-11-26 00:32:35,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2022-11-26 00:32:35,934 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:32:35,935 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] [2022-11-26 00:32:35,944 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-26 00:32:36,136 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:32:36,137 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:32:36,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:32:36,137 INFO L85 PathProgramCache]: Analyzing trace with hash 1897496259, now seen corresponding path program 1 times [2022-11-26 00:32:36,137 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:32:36,137 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1333016346] [2022-11-26 00:32:36,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:32:36,137 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:32:36,148 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-26 00:32:36,148 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2145679246] [2022-11-26 00:32:36,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:32:36,149 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:32:36,149 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:32:36,150 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:32:36,152 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-26 00:32:36,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:32:36,218 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 77 conjunts are in the unsatisfiable core [2022-11-26 00:32:36,220 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:32:37,262 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 18 proven. 20 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2022-11-26 00:32:37,262 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:32:39,245 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 16 proven. 19 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2022-11-26 00:32:39,246 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:32:39,246 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1333016346] [2022-11-26 00:32:39,246 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-26 00:32:39,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2145679246] [2022-11-26 00:32:39,247 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2145679246] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:32:39,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1631486540] [2022-11-26 00:32:39,249 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-26 00:32:39,249 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:32:39,249 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:32:39,250 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:32:39,250 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:32:45,590 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2022-11-26 00:32:45,632 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-26 00:32:45,645 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:32:52,968 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10628#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:32:52,968 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:32:52,968 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-26 00:32:52,968 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 14] total 29 [2022-11-26 00:32:52,968 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1376756791] [2022-11-26 00:32:52,968 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-26 00:32:52,969 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-11-26 00:32:52,969 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:32:52,970 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-11-26 00:32:52,971 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=1861, Unknown=0, NotChecked=0, Total=2070 [2022-11-26 00:32:52,971 INFO L87 Difference]: Start difference. First operand 342 states and 486 transitions. Second operand has 29 states, 26 states have (on average 2.0) internal successors, (52), 26 states have internal predecessors, (52), 8 states have call successors, (23), 3 states have call predecessors, (23), 2 states have return successors, (22), 6 states have call predecessors, (22), 6 states have call successors, (22) [2022-11-26 00:33:03,813 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.47s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-26 00:33:54,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:33:54,047 INFO L93 Difference]: Finished difference Result 489 states and 696 transitions. [2022-11-26 00:33:54,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2022-11-26 00:33:54,048 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 26 states have (on average 2.0) internal successors, (52), 26 states have internal predecessors, (52), 8 states have call successors, (23), 3 states have call predecessors, (23), 2 states have return successors, (22), 6 states have call predecessors, (22), 6 states have call successors, (22) Word has length 78 [2022-11-26 00:33:54,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:33:54,053 INFO L225 Difference]: With dead ends: 489 [2022-11-26 00:33:54,053 INFO L226 Difference]: Without dead ends: 485 [2022-11-26 00:33:54,058 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 295 GetRequests, 172 SyntacticMatches, 16 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4331 ImplicationChecksByTransitivity, 52.5s TimeCoverageRelationStatistics Valid=1513, Invalid=10259, Unknown=0, NotChecked=0, Total=11772 [2022-11-26 00:33:54,058 INFO L413 NwaCegarLoop]: 91 mSDtfsCounter, 295 mSDsluCounter, 458 mSDsCounter, 0 mSdLazyCounter, 2063 mSolverCounterSat, 536 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 295 SdHoareTripleChecker+Valid, 549 SdHoareTripleChecker+Invalid, 2599 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 536 IncrementalHoareTripleChecker+Valid, 2063 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 17.1s IncrementalHoareTripleChecker+Time [2022-11-26 00:33:54,059 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [295 Valid, 549 Invalid, 2599 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [536 Valid, 2063 Invalid, 0 Unknown, 0 Unchecked, 17.1s Time] [2022-11-26 00:33:54,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 485 states. [2022-11-26 00:33:54,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 485 to 441. [2022-11-26 00:33:54,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 441 states, 253 states have (on average 1.225296442687747) internal successors, (310), 254 states have internal predecessors, (310), 165 states have call successors, (165), 22 states have call predecessors, (165), 22 states have return successors, (164), 164 states have call predecessors, (164), 164 states have call successors, (164) [2022-11-26 00:33:54,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 441 states to 441 states and 639 transitions. [2022-11-26 00:33:54,500 INFO L78 Accepts]: Start accepts. Automaton has 441 states and 639 transitions. Word has length 78 [2022-11-26 00:33:54,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:33:54,501 INFO L495 AbstractCegarLoop]: Abstraction has 441 states and 639 transitions. [2022-11-26 00:33:54,501 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 26 states have (on average 2.0) internal successors, (52), 26 states have internal predecessors, (52), 8 states have call successors, (23), 3 states have call predecessors, (23), 2 states have return successors, (22), 6 states have call predecessors, (22), 6 states have call successors, (22) [2022-11-26 00:33:54,501 INFO L276 IsEmpty]: Start isEmpty. Operand 441 states and 639 transitions. [2022-11-26 00:33:54,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2022-11-26 00:33:54,502 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:33:54,503 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] [2022-11-26 00:33:54,513 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-26 00:33:54,708 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-26 00:33:54,708 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:33:54,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:33:54,708 INFO L85 PathProgramCache]: Analyzing trace with hash -1729932497, now seen corresponding path program 1 times [2022-11-26 00:33:54,709 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:33:54,709 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2042133286] [2022-11-26 00:33:54,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:33:54,709 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:33:54,718 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-26 00:33:54,718 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1787472323] [2022-11-26 00:33:54,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:33:54,719 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:33:54,719 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:33:54,720 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:33:54,723 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-26 00:33:54,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:33:54,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 31 conjunts are in the unsatisfiable core [2022-11-26 00:33:54,786 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:33:55,044 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 22 proven. 17 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2022-11-26 00:33:55,044 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:33:55,585 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 22 proven. 14 refuted. 0 times theorem prover too weak. 192 trivial. 0 not checked. [2022-11-26 00:33:55,585 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:33:55,585 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2042133286] [2022-11-26 00:33:55,585 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-26 00:33:55,585 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1787472323] [2022-11-26 00:33:55,585 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1787472323] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:33:55,585 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [97649264] [2022-11-26 00:33:55,587 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-26 00:33:55,587 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:33:55,588 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:33:55,588 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:33:55,588 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:33:58,047 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2022-11-26 00:33:58,086 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-26 00:33:58,097 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:34:00,832 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12747#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:34:00,832 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:34:00,832 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-26 00:34:00,832 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10] total 20 [2022-11-26 00:34:00,832 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [767255882] [2022-11-26 00:34:00,833 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-26 00:34:00,833 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-26 00:34:00,833 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:34:00,834 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-26 00:34:00,834 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=1170, Unknown=0, NotChecked=0, Total=1332 [2022-11-26 00:34:00,835 INFO L87 Difference]: Start difference. First operand 441 states and 639 transitions. Second operand has 20 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 17 states have internal predecessors, (37), 8 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26) [2022-11-26 00:34:04,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:34:04,567 INFO L93 Difference]: Finished difference Result 1009 states and 1593 transitions. [2022-11-26 00:34:04,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-26 00:34:04,568 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 17 states have internal predecessors, (37), 8 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26) Word has length 81 [2022-11-26 00:34:04,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:34:04,573 INFO L225 Difference]: With dead ends: 1009 [2022-11-26 00:34:04,573 INFO L226 Difference]: Without dead ends: 1007 [2022-11-26 00:34:04,575 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 196 SyntacticMatches, 11 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1319 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=469, Invalid=2837, Unknown=0, NotChecked=0, Total=3306 [2022-11-26 00:34:04,575 INFO L413 NwaCegarLoop]: 72 mSDtfsCounter, 140 mSDsluCounter, 435 mSDsCounter, 0 mSdLazyCounter, 805 mSolverCounterSat, 191 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 144 SdHoareTripleChecker+Valid, 507 SdHoareTripleChecker+Invalid, 996 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 191 IncrementalHoareTripleChecker+Valid, 805 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-11-26 00:34:04,576 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [144 Valid, 507 Invalid, 996 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [191 Valid, 805 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-11-26 00:34:04,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1007 states. [2022-11-26 00:34:06,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1007 to 929. [2022-11-26 00:34:06,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 929 states, 447 states have (on average 1.3221476510067114) internal successors, (591), 448 states have internal predecessors, (591), 457 states have call successors, (457), 24 states have call predecessors, (457), 24 states have return successors, (456), 456 states have call predecessors, (456), 456 states have call successors, (456) [2022-11-26 00:34:06,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 929 states to 929 states and 1504 transitions. [2022-11-26 00:34:06,033 INFO L78 Accepts]: Start accepts. Automaton has 929 states and 1504 transitions. Word has length 81 [2022-11-26 00:34:06,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:34:06,034 INFO L495 AbstractCegarLoop]: Abstraction has 929 states and 1504 transitions. [2022-11-26 00:34:06,034 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 17 states have internal predecessors, (37), 8 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26) [2022-11-26 00:34:06,034 INFO L276 IsEmpty]: Start isEmpty. Operand 929 states and 1504 transitions. [2022-11-26 00:34:06,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2022-11-26 00:34:06,036 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:34:06,036 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 4, 3, 3, 3, 3, 3, 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] [2022-11-26 00:34:06,044 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2022-11-26 00:34:06,241 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-26 00:34:06,241 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:34:06,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:34:06,242 INFO L85 PathProgramCache]: Analyzing trace with hash 144664241, now seen corresponding path program 1 times [2022-11-26 00:34:06,242 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:34:06,242 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [60517480] [2022-11-26 00:34:06,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:34:06,242 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:34:06,258 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-26 00:34:06,266 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [975656403] [2022-11-26 00:34:06,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:34:06,266 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:34:06,266 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:34:06,267 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:34:06,296 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-26 00:34:06,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:34:06,348 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 49 conjunts are in the unsatisfiable core [2022-11-26 00:34:06,350 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:34:07,113 INFO L134 CoverageAnalysis]: Checked inductivity of 194 backedges. 20 proven. 21 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2022-11-26 00:34:07,114 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:34:08,652 INFO L134 CoverageAnalysis]: Checked inductivity of 194 backedges. 18 proven. 20 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2022-11-26 00:34:08,653 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:34:08,653 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [60517480] [2022-11-26 00:34:08,653 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-26 00:34:08,653 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [975656403] [2022-11-26 00:34:08,653 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [975656403] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:34:08,653 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [155060743] [2022-11-26 00:34:08,655 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-26 00:34:08,655 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:34:08,656 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:34:08,656 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:34:08,656 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:34:13,829 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2022-11-26 00:34:13,868 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-26 00:34:13,884 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:34:25,016 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 [2022-11-26 00:34:25,016 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:34:25,016 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-26 00:34:25,016 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11] total 22 [2022-11-26 00:34:25,016 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1157801527] [2022-11-26 00:34:25,016 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-26 00:34:25,017 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-26 00:34:25,017 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:34:25,018 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-26 00:34:25,018 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=1250, Unknown=0, NotChecked=0, Total=1406 [2022-11-26 00:34:25,019 INFO L87 Difference]: Start difference. First operand 929 states and 1504 transitions. Second operand has 22 states, 21 states have (on average 2.2857142857142856) internal successors, (48), 19 states have internal predecessors, (48), 8 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 8 states have call predecessors, (24), 8 states have call successors, (24) [2022-11-26 00:34:59,097 WARN L837 $PredicateComparison]: unable to prove that (let ((.cse0 (* |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~p~0#1|)) (.cse1 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~r~0#1|)) (.cse5 (* 2 |c_ULTIMATE.start_main_~b~0#1|))) (let ((.cse6 (+ .cse0 .cse1 .cse5)) (.cse7 (* (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~s~0#1|) 2)) (.cse8 (* (* |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~q~0#1|) 2)) (.cse4 (* 3 |c_ULTIMATE.start_main_~b~0#1|)) (.cse9 (* |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~d~0#1| |c_ULTIMATE.start_main_~q~0#1|)) (.cse10 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~d~0#1| |c_ULTIMATE.start_main_~s~0#1|)) (.cse2 (* |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~k~0#1| |c_ULTIMATE.start_main_~q~0#1|)) (.cse3 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~s~0#1| |c_ULTIMATE.start_main_~k~0#1|))) (and (or (<= |c_ULTIMATE.start_main_~b~0#1| |c_ULTIMATE.start_main_~c~0#1|) (= (+ .cse0 .cse1) (+ |c_ULTIMATE.start_main_~c~0#1| .cse2 .cse3))) (or (<= .cse4 |c_ULTIMATE.start_main_~a~0#1|) (not (<= .cse5 |c_ULTIMATE.start_main_~a~0#1|)) (= .cse6 (+ .cse7 |c_ULTIMATE.start_main_~a~0#1| .cse8))) (or (= .cse6 (+ |c_ULTIMATE.start_main_~c~0#1| .cse7 .cse8 .cse2 .cse3)) (<= .cse4 |c_ULTIMATE.start_main_~c~0#1|) (not (<= .cse5 |c_ULTIMATE.start_main_~c~0#1|))) (= 1 |c_ULTIMATE.start_main_~q~0#1|) (= (+ 2 |c_ULTIMATE.start_main_~s~0#1|) 0) (or (= (+ .cse9 |c_ULTIMATE.start_main_~c~0#1| .cse10 .cse2 .cse3) (+ .cse0 .cse1 |c_ULTIMATE.start_main_~v~0#1|)) (<= (+ |c_ULTIMATE.start_main_~v~0#1| |c_ULTIMATE.start_main_~b~0#1|) |c_ULTIMATE.start_main_~c~0#1|)) (let ((.cse11 (* 2 |c_ULTIMATE.start_main_~v~0#1|))) (or (<= (+ |c_ULTIMATE.start_main_~b~0#1| .cse11) |c_ULTIMATE.start_main_~c~0#1|) (= (+ |c_ULTIMATE.start_main_~c~0#1| (* .cse9 2) (* 2 .cse10) .cse2 .cse3) (+ .cse0 .cse1 .cse11)) (not (<= .cse11 |c_ULTIMATE.start_main_~c~0#1|)))) (not (<= |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~b~0#1|)) (<= 0 |c_ULTIMATE.start_main_~b~0#1|) (= |c_ULTIMATE.start_main_~x~0#1| (+ (* |c_ULTIMATE.start_main_~y~0#1| 2) |c_ULTIMATE.start_main_~b~0#1|))))) is different from false [2022-11-26 00:35:01,146 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 [] [2022-11-26 00:35:12,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:35:12,471 INFO L93 Difference]: Finished difference Result 1563 states and 2541 transitions. [2022-11-26 00:35:12,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2022-11-26 00:35:12,472 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 2.2857142857142856) internal successors, (48), 19 states have internal predecessors, (48), 8 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 8 states have call predecessors, (24), 8 states have call successors, (24) Word has length 81 [2022-11-26 00:35:12,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:35:12,480 INFO L225 Difference]: With dead ends: 1563 [2022-11-26 00:35:12,481 INFO L226 Difference]: Without dead ends: 1561 [2022-11-26 00:35:12,483 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 187 SyntacticMatches, 18 SemanticMatches, 84 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 2954 ImplicationChecksByTransitivity, 35.2s TimeCoverageRelationStatistics Valid=1083, Invalid=6058, Unknown=3, NotChecked=166, Total=7310 [2022-11-26 00:35:12,484 INFO L413 NwaCegarLoop]: 84 mSDtfsCounter, 207 mSDsluCounter, 374 mSDsCounter, 0 mSdLazyCounter, 1474 mSolverCounterSat, 393 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 21.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 211 SdHoareTripleChecker+Valid, 458 SdHoareTripleChecker+Invalid, 1869 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 393 IncrementalHoareTripleChecker+Valid, 1474 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 1 IncrementalHoareTripleChecker+Unchecked, 22.0s IncrementalHoareTripleChecker+Time [2022-11-26 00:35:12,484 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [211 Valid, 458 Invalid, 1869 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [393 Valid, 1474 Invalid, 1 Unknown, 1 Unchecked, 22.0s Time] [2022-11-26 00:35:12,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1561 states. [2022-11-26 00:35:14,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1561 to 1206. [2022-11-26 00:35:14,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1206 states, 587 states have (on average 1.323679727427598) internal successors, (777), 588 states have internal predecessors, (777), 589 states have call successors, (589), 29 states have call predecessors, (589), 29 states have return successors, (588), 588 states have call predecessors, (588), 588 states have call successors, (588) [2022-11-26 00:35:14,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1206 states to 1206 states and 1954 transitions. [2022-11-26 00:35:14,250 INFO L78 Accepts]: Start accepts. Automaton has 1206 states and 1954 transitions. Word has length 81 [2022-11-26 00:35:14,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:35:14,250 INFO L495 AbstractCegarLoop]: Abstraction has 1206 states and 1954 transitions. [2022-11-26 00:35:14,250 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 2.2857142857142856) internal successors, (48), 19 states have internal predecessors, (48), 8 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 8 states have call predecessors, (24), 8 states have call successors, (24) [2022-11-26 00:35:14,250 INFO L276 IsEmpty]: Start isEmpty. Operand 1206 states and 1954 transitions. [2022-11-26 00:35:14,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2022-11-26 00:35:14,252 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:35:14,252 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] [2022-11-26 00:35:14,259 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2022-11-26 00:35:14,458 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-26 00:35:14,458 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:35:14,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:35:14,458 INFO L85 PathProgramCache]: Analyzing trace with hash 646028470, now seen corresponding path program 6 times [2022-11-26 00:35:14,458 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:35:14,458 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [141466678] [2022-11-26 00:35:14,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:35:14,459 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:35:14,468 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-26 00:35:14,468 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2067998581] [2022-11-26 00:35:14,469 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 00:35:14,469 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:35:14,469 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:35:14,470 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:35:14,476 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-26 00:35:14,535 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 00:35:14,535 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:35:14,537 INFO L263 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-26 00:35:14,539 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:35:16,706 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 34 proven. 44 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2022-11-26 00:35:16,706 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:35:17,873 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 55 proven. 9 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2022-11-26 00:35:17,874 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:35:17,874 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [141466678] [2022-11-26 00:35:17,874 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-26 00:35:17,874 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2067998581] [2022-11-26 00:35:17,875 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2067998581] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:35:17,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2025714556] [2022-11-26 00:35:17,876 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-26 00:35:17,877 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:35:17,877 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:35:17,877 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:35:17,877 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:35:24,805 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-26 00:35:24,810 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-26 00:35:24,839 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:35:27,458 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21872#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:35:27,458 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:35:27,458 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-26 00:35:27,458 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 8] total 24 [2022-11-26 00:35:27,458 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [379348777] [2022-11-26 00:35:27,458 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-26 00:35:27,459 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-26 00:35:27,459 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:35:27,459 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-26 00:35:27,460 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=1624, Unknown=0, NotChecked=0, Total=1806 [2022-11-26 00:35:27,460 INFO L87 Difference]: Start difference. First operand 1206 states and 1954 transitions. Second operand has 24 states, 23 states have (on average 2.739130434782609) internal successors, (63), 20 states have internal predecessors, (63), 8 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (21), 6 states have call predecessors, (21), 6 states have call successors, (21) [2022-11-26 00:36:03,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:36:03,728 INFO L93 Difference]: Finished difference Result 1353 states and 2168 transitions. [2022-11-26 00:36:03,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-11-26 00:36:03,729 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 2.739130434782609) internal successors, (63), 20 states have internal predecessors, (63), 8 states have call successors, (21), 3 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 [2022-11-26 00:36:03,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:36:03,735 INFO L225 Difference]: With dead ends: 1353 [2022-11-26 00:36:03,735 INFO L226 Difference]: Without dead ends: 1351 [2022-11-26 00:36:03,737 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 216 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1102 ImplicationChecksByTransitivity, 25.4s TimeCoverageRelationStatistics Valid=378, Invalid=3281, Unknown=1, NotChecked=0, Total=3660 [2022-11-26 00:36:03,738 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 110 mSDsluCounter, 261 mSDsCounter, 0 mSdLazyCounter, 1112 mSolverCounterSat, 158 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 13.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 112 SdHoareTripleChecker+Valid, 304 SdHoareTripleChecker+Invalid, 1270 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 158 IncrementalHoareTripleChecker+Valid, 1112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.3s IncrementalHoareTripleChecker+Time [2022-11-26 00:36:03,738 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [112 Valid, 304 Invalid, 1270 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [158 Valid, 1112 Invalid, 0 Unknown, 0 Unchecked, 13.3s Time] [2022-11-26 00:36:03,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1351 states. [2022-11-26 00:36:05,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1351 to 1230. [2022-11-26 00:36:05,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1230 states, 605 states have (on average 1.3140495867768596) internal successors, (795), 606 states have internal predecessors, (795), 589 states have call successors, (589), 35 states have call predecessors, (589), 35 states have return successors, (588), 588 states have call predecessors, (588), 588 states have call successors, (588) [2022-11-26 00:36:05,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1230 states to 1230 states and 1972 transitions. [2022-11-26 00:36:05,762 INFO L78 Accepts]: Start accepts. Automaton has 1230 states and 1972 transitions. Word has length 84 [2022-11-26 00:36:05,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:36:05,762 INFO L495 AbstractCegarLoop]: Abstraction has 1230 states and 1972 transitions. [2022-11-26 00:36:05,763 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 2.739130434782609) internal successors, (63), 20 states have internal predecessors, (63), 8 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (21), 6 states have call predecessors, (21), 6 states have call successors, (21) [2022-11-26 00:36:05,763 INFO L276 IsEmpty]: Start isEmpty. Operand 1230 states and 1972 transitions. [2022-11-26 00:36:05,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2022-11-26 00:36:05,765 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:36:05,765 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] [2022-11-26 00:36:05,776 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-26 00:36:05,970 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:36:05,971 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:36:05,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:36:05,971 INFO L85 PathProgramCache]: Analyzing trace with hash 355863159, now seen corresponding path program 2 times [2022-11-26 00:36:05,971 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:36:05,972 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1696172008] [2022-11-26 00:36:05,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:36:05,972 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:36:05,980 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-26 00:36:05,980 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1949247340] [2022-11-26 00:36:05,980 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 00:36:05,981 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:36:05,981 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:36:05,982 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:36:05,984 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-26 00:36:06,061 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-26 00:36:06,061 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:36:06,063 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 67 conjunts are in the unsatisfiable core [2022-11-26 00:36:06,065 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:36:07,145 INFO L134 CoverageAnalysis]: Checked inductivity of 327 backedges. 27 proven. 27 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2022-11-26 00:36:07,145 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:36:10,376 INFO L134 CoverageAnalysis]: Checked inductivity of 327 backedges. 24 proven. 27 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2022-11-26 00:36:10,376 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:36:10,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1696172008] [2022-11-26 00:36:10,377 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-26 00:36:10,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1949247340] [2022-11-26 00:36:10,377 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1949247340] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:36:10,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1727423277] [2022-11-26 00:36:10,379 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-26 00:36:10,379 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:36:10,379 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:36:10,379 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:36:10,380 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:36:16,273 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-26 00:36:16,277 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-26 00:36:16,289 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:36:21,564 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26895#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:36:21,564 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:36:21,565 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-26 00:36:21,565 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 30 [2022-11-26 00:36:21,565 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [182074781] [2022-11-26 00:36:21,565 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-26 00:36:21,565 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-11-26 00:36:21,566 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:36:21,566 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-11-26 00:36:21,567 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=1926, Unknown=0, NotChecked=0, Total=2162 [2022-11-26 00:36:21,567 INFO L87 Difference]: Start difference. First operand 1230 states and 1972 transitions. Second operand has 30 states, 27 states have (on average 1.9259259259259258) internal successors, (52), 27 states have internal predecessors, (52), 9 states have call successors, (30), 3 states have call predecessors, (30), 2 states have return successors, (29), 8 states have call predecessors, (29), 7 states have call successors, (29) [2022-11-26 00:36:32,737 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.33s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-26 00:37:01,595 WARN L233 SmtUtils]: Spent 6.62s on a formula simplification. DAG size of input: 88 DAG size of output: 87 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-26 00:37:05,788 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-26 00:37:45,504 WARN L233 SmtUtils]: Spent 5.61s on a formula simplification. DAG size of input: 73 DAG size of output: 72 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-26 00:37:56,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:37:56,126 INFO L93 Difference]: Finished difference Result 2049 states and 3293 transitions. [2022-11-26 00:37:56,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2022-11-26 00:37:56,126 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 27 states have (on average 1.9259259259259258) internal successors, (52), 27 states have internal predecessors, (52), 9 states have call successors, (30), 3 states have call predecessors, (30), 2 states have return successors, (29), 8 states have call predecessors, (29), 7 states have call successors, (29) Word has length 98 [2022-11-26 00:37:56,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:37:56,131 INFO L225 Difference]: With dead ends: 2049 [2022-11-26 00:37:56,132 INFO L226 Difference]: Without dead ends: 1531 [2022-11-26 00:37:56,136 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 371 GetRequests, 237 SyntacticMatches, 10 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5676 ImplicationChecksByTransitivity, 74.5s TimeCoverageRelationStatistics Valid=2369, Invalid=13381, Unknown=0, NotChecked=0, Total=15750 [2022-11-26 00:37:56,137 INFO L413 NwaCegarLoop]: 99 mSDtfsCounter, 319 mSDsluCounter, 608 mSDsCounter, 0 mSdLazyCounter, 2184 mSolverCounterSat, 739 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 23.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 319 SdHoareTripleChecker+Valid, 707 SdHoareTripleChecker+Invalid, 2923 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 739 IncrementalHoareTripleChecker+Valid, 2184 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 24.2s IncrementalHoareTripleChecker+Time [2022-11-26 00:37:56,137 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [319 Valid, 707 Invalid, 2923 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [739 Valid, 2184 Invalid, 0 Unknown, 0 Unchecked, 24.2s Time] [2022-11-26 00:37:56,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1531 states. [2022-11-26 00:37:58,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1531 to 1338. [2022-11-26 00:37:58,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1338 states, 653 states have (on average 1.3124042879019908) internal successors, (857), 654 states have internal predecessors, (857), 645 states have call successors, (645), 39 states have call predecessors, (645), 39 states have return successors, (644), 644 states have call predecessors, (644), 644 states have call successors, (644) [2022-11-26 00:37:58,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1338 states to 1338 states and 2146 transitions. [2022-11-26 00:37:58,319 INFO L78 Accepts]: Start accepts. Automaton has 1338 states and 2146 transitions. Word has length 98 [2022-11-26 00:37:58,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:37:58,319 INFO L495 AbstractCegarLoop]: Abstraction has 1338 states and 2146 transitions. [2022-11-26 00:37:58,320 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 27 states have (on average 1.9259259259259258) internal successors, (52), 27 states have internal predecessors, (52), 9 states have call successors, (30), 3 states have call predecessors, (30), 2 states have return successors, (29), 8 states have call predecessors, (29), 7 states have call successors, (29) [2022-11-26 00:37:58,320 INFO L276 IsEmpty]: Start isEmpty. Operand 1338 states and 2146 transitions. [2022-11-26 00:37:58,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2022-11-26 00:37:58,322 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:37:58,322 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:37:58,331 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2022-11-26 00:37:58,527 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-26 00:37:58,528 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:37:58,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:37:58,528 INFO L85 PathProgramCache]: Analyzing trace with hash -1281823225, now seen corresponding path program 3 times [2022-11-26 00:37:58,528 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:37:58,528 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [348257848] [2022-11-26 00:37:58,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:37:58,528 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:37:58,537 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-26 00:37:58,537 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1203327033] [2022-11-26 00:37:58,537 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 00:37:58,537 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:37:58,538 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:37:58,539 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:37:58,548 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-26 00:37:58,623 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 00:37:58,624 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:37:58,626 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 88 conjunts are in the unsatisfiable core [2022-11-26 00:37:58,628 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:38:00,106 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 52 proven. 46 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2022-11-26 00:38:00,106 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:38:08,461 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 50 proven. 45 refuted. 0 times theorem prover too weak. 243 trivial. 0 not checked. [2022-11-26 00:38:08,461 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:38:08,462 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [348257848] [2022-11-26 00:38:08,462 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-26 00:38:08,462 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1203327033] [2022-11-26 00:38:08,462 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1203327033] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:38:08,462 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [336663716] [2022-11-26 00:38:08,464 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-26 00:38:08,464 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:38:08,464 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:38:08,465 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:38:08,465 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:38:14,732 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2022-11-26 00:38:14,773 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-26 00:38:14,786 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:38:29,198 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '33427#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:38:29,199 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:38:29,199 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-26 00:38:29,199 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 19] total 37 [2022-11-26 00:38:29,199 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [88007550] [2022-11-26 00:38:29,199 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-26 00:38:29,200 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-11-26 00:38:29,200 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:38:29,203 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-11-26 00:38:29,204 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=318, Invalid=2544, Unknown=0, NotChecked=0, Total=2862 [2022-11-26 00:38:29,204 INFO L87 Difference]: Start difference. First operand 1338 states and 2146 transitions. Second operand has 37 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 35 states have internal predecessors, (67), 11 states have call successors, (31), 3 states have call predecessors, (31), 3 states have return successors, (30), 9 states have call predecessors, (30), 9 states have call successors, (30) [2022-11-26 00:38:45,620 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.45s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-26 00:38:52,292 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-26 00:38:54,147 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.84s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-26 00:38:56,164 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-26 00:38:59,420 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-26 00:39:11,265 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.53s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-26 00:39:13,339 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-26 00:39:24,656 WARN L233 SmtUtils]: Spent 6.54s on a formula simplification that was a NOOP. DAG size: 113 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-26 00:39:35,598 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-26 00:39:37,599 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-26 00:39:39,600 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-26 00:39:41,607 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-26 00:39:43,056 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.45s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-26 00:39:58,860 WARN L233 SmtUtils]: Spent 9.16s on a formula simplification that was a NOOP. DAG size: 101 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-26 00:40:01,382 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-26 00:40:10,843 WARN L233 SmtUtils]: Spent 7.94s on a formula simplification that was a NOOP. DAG size: 107 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-26 00:40:13,486 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-26 00:40:16,751 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-26 00:40:19,932 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-26 00:40:25,085 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-26 00:40:41,458 WARN L233 SmtUtils]: Spent 6.50s on a formula simplification that was a NOOP. DAG size: 106 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-26 00:40:50,080 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.12s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-26 00:40:54,502 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-26 00:41:03,041 WARN L233 SmtUtils]: Spent 8.02s on a formula simplification. DAG size of input: 108 DAG size of output: 106 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-26 00:41:08,390 WARN L233 SmtUtils]: Spent 5.15s on a formula simplification that was a NOOP. DAG size: 115 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-26 00:41:18,002 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-26 00:41:22,476 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.94s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-26 00:41:24,787 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-26 00:41:27,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:41:27,987 INFO L93 Difference]: Finished difference Result 1567 states and 2457 transitions. [2022-11-26 00:41:27,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2022-11-26 00:41:27,988 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 35 states have internal predecessors, (67), 11 states have call successors, (31), 3 states have call predecessors, (31), 3 states have return successors, (30), 9 states have call predecessors, (30), 9 states have call successors, (30) Word has length 103 [2022-11-26 00:41:27,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:41:28,012 INFO L225 Difference]: With dead ends: 1567 [2022-11-26 00:41:28,023 INFO L226 Difference]: Without dead ends: 1559 [2022-11-26 00:41:28,025 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 373 GetRequests, 233 SyntacticMatches, 22 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5650 ImplicationChecksByTransitivity, 119.0s TimeCoverageRelationStatistics Valid=2147, Invalid=12132, Unknown=1, NotChecked=0, Total=14280 [2022-11-26 00:41:28,026 INFO L413 NwaCegarLoop]: 50 mSDtfsCounter, 344 mSDsluCounter, 354 mSDsCounter, 0 mSdLazyCounter, 2605 mSolverCounterSat, 627 mSolverCounterUnsat, 16 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 72.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 344 SdHoareTripleChecker+Valid, 404 SdHoareTripleChecker+Invalid, 3248 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 627 IncrementalHoareTripleChecker+Valid, 2605 IncrementalHoareTripleChecker+Invalid, 16 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 73.1s IncrementalHoareTripleChecker+Time [2022-11-26 00:41:28,026 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [344 Valid, 404 Invalid, 3248 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [627 Valid, 2605 Invalid, 16 Unknown, 0 Unchecked, 73.1s Time] [2022-11-26 00:41:28,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1559 states. [2022-11-26 00:41:31,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1559 to 1463. [2022-11-26 00:41:31,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1463 states, 716 states have (on average 1.308659217877095) internal successors, (937), 717 states have internal predecessors, (937), 701 states have call successors, (701), 45 states have call predecessors, (701), 45 states have return successors, (700), 700 states have call predecessors, (700), 700 states have call successors, (700) [2022-11-26 00:41:31,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1463 states to 1463 states and 2338 transitions. [2022-11-26 00:41:31,970 INFO L78 Accepts]: Start accepts. Automaton has 1463 states and 2338 transitions. Word has length 103 [2022-11-26 00:41:31,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:41:31,970 INFO L495 AbstractCegarLoop]: Abstraction has 1463 states and 2338 transitions. [2022-11-26 00:41:31,971 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 35 states have internal predecessors, (67), 11 states have call successors, (31), 3 states have call predecessors, (31), 3 states have return successors, (30), 9 states have call predecessors, (30), 9 states have call successors, (30) [2022-11-26 00:41:31,971 INFO L276 IsEmpty]: Start isEmpty. Operand 1463 states and 2338 transitions. [2022-11-26 00:41:31,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2022-11-26 00:41:31,973 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:41:31,973 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 4, 4, 4, 4, 4, 4, 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] [2022-11-26 00:41:31,984 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-26 00:41:32,184 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:41:32,184 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:41:32,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:41:32,185 INFO L85 PathProgramCache]: Analyzing trace with hash 1547138168, now seen corresponding path program 2 times [2022-11-26 00:41:32,185 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:41:32,185 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [418277653] [2022-11-26 00:41:32,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:41:32,185 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:41:32,193 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-26 00:41:32,193 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [904631361] [2022-11-26 00:41:32,194 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 00:41:32,194 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:41:32,194 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:41:32,195 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:41:32,198 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-26 00:41:32,271 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-26 00:41:32,271 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:41:32,273 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 69 conjunts are in the unsatisfiable core [2022-11-26 00:41:32,277 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:41:33,755 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 70 proven. 35 refuted. 0 times theorem prover too weak. 291 trivial. 0 not checked. [2022-11-26 00:41:33,755 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:41:34,622 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:41:34,622 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [418277653] [2022-11-26 00:41:34,622 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-26 00:41:34,622 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [904631361] [2022-11-26 00:41:34,622 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [904631361] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:41:34,622 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1024194018] [2022-11-26 00:41:34,624 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-26 00:41:34,624 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:41:34,624 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:41:34,625 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:41:34,625 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:41:40,835 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2022-11-26 00:41:40,880 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-26 00:41:40,893 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:41:49,823 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '39052#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:41:49,824 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:41:49,824 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-26 00:41:49,825 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2022-11-26 00:41:49,825 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1110214229] [2022-11-26 00:41:49,825 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-26 00:41:49,825 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-26 00:41:49,825 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:41:49,825 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-26 00:41:49,826 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=1388, Unknown=0, NotChecked=0, Total=1560 [2022-11-26 00:41:49,826 INFO L87 Difference]: Start difference. First operand 1463 states and 2338 transitions. Second operand has 18 states, 17 states have (on average 2.176470588235294) internal successors, (37), 16 states have internal predecessors, (37), 5 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (13), 5 states have call predecessors, (13), 5 states have call successors, (13) [2022-11-26 00:41:56,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:41:56,331 INFO L93 Difference]: Finished difference Result 1652 states and 2630 transitions. [2022-11-26 00:41:56,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-26 00:41:56,332 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.176470588235294) internal successors, (37), 16 states have internal predecessors, (37), 5 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (13), 5 states have call predecessors, (13), 5 states have call successors, (13) Word has length 108 [2022-11-26 00:41:56,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:41:56,341 INFO L225 Difference]: With dead ends: 1652 [2022-11-26 00:41:56,341 INFO L226 Difference]: Without dead ends: 1650 [2022-11-26 00:41:56,343 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 172 SyntacticMatches, 25 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1540 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=250, Invalid=2006, Unknown=0, NotChecked=0, Total=2256 [2022-11-26 00:41:56,344 INFO L413 NwaCegarLoop]: 50 mSDtfsCounter, 83 mSDsluCounter, 184 mSDsCounter, 0 mSdLazyCounter, 1161 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 99 SdHoareTripleChecker+Valid, 234 SdHoareTripleChecker+Invalid, 1226 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 1161 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-11-26 00:41:56,344 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [99 Valid, 234 Invalid, 1226 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 1161 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-11-26 00:41:56,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1650 states. [2022-11-26 00:42:00,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1650 to 1625. [2022-11-26 00:42:00,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1625 states, 794 states have (on average 1.3123425692695214) internal successors, (1042), 795 states have internal predecessors, (1042), 781 states have call successors, (781), 49 states have call predecessors, (781), 49 states have return successors, (780), 780 states have call predecessors, (780), 780 states have call successors, (780) [2022-11-26 00:42:00,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1625 states to 1625 states and 2603 transitions. [2022-11-26 00:42:00,513 INFO L78 Accepts]: Start accepts. Automaton has 1625 states and 2603 transitions. Word has length 108 [2022-11-26 00:42:00,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:42:00,514 INFO L495 AbstractCegarLoop]: Abstraction has 1625 states and 2603 transitions. [2022-11-26 00:42:00,514 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 2.176470588235294) internal successors, (37), 16 states have internal predecessors, (37), 5 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (13), 5 states have call predecessors, (13), 5 states have call successors, (13) [2022-11-26 00:42:00,514 INFO L276 IsEmpty]: Start isEmpty. Operand 1625 states and 2603 transitions. [2022-11-26 00:42:00,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2022-11-26 00:42:00,516 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:42:00,517 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 5, 4, 4, 4, 4, 4, 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] [2022-11-26 00:42:00,531 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-26 00:42:00,723 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:42:00,723 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:42:00,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:42:00,724 INFO L85 PathProgramCache]: Analyzing trace with hash -1168736987, now seen corresponding path program 3 times [2022-11-26 00:42:00,724 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:42:00,724 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [778587101] [2022-11-26 00:42:00,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:42:00,724 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:42:00,742 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-26 00:42:00,742 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1360418174] [2022-11-26 00:42:00,743 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 00:42:00,743 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:42:00,743 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:42:00,744 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:42:00,752 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-26 00:42:00,831 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 00:42:00,831 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:42:00,834 INFO L263 TraceCheckSpWp]: Trace formula consists of 251 conjuncts, 82 conjunts are in the unsatisfiable core [2022-11-26 00:42:00,837 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:42:02,140 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 63 proven. 57 refuted. 0 times theorem prover too weak. 285 trivial. 0 not checked. [2022-11-26 00:42:02,140 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:42:03,038 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:42:03,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [778587101] [2022-11-26 00:42:03,038 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-26 00:42:03,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1360418174] [2022-11-26 00:42:03,038 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1360418174] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:42:03,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1966282386] [2022-11-26 00:42:03,040 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-26 00:42:03,040 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:42:03,040 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:42:03,040 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:42:03,040 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:42:09,244 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2022-11-26 00:42:09,288 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-26 00:42:09,302 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:42:17,830 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '45013#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:42:17,830 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:42:17,830 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-26 00:42:17,830 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2022-11-26 00:42:17,830 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [543990764] [2022-11-26 00:42:17,831 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-26 00:42:17,831 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-26 00:42:17,831 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:42:17,832 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-26 00:42:17,832 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=1550, Unknown=0, NotChecked=0, Total=1722 [2022-11-26 00:42:17,832 INFO L87 Difference]: Start difference. First operand 1625 states and 2603 transitions. Second operand has 20 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 17 states have internal predecessors, (41), 7 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (17), 6 states have call predecessors, (17), 6 states have call successors, (17) [2022-11-26 00:42:24,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:42:24,293 INFO L93 Difference]: Finished difference Result 2050 states and 3268 transitions. [2022-11-26 00:42:24,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-26 00:42:24,294 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 17 states have internal predecessors, (41), 7 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (17), 6 states have call predecessors, (17), 6 states have call successors, (17) Word has length 111 [2022-11-26 00:42:24,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:42:24,301 INFO L225 Difference]: With dead ends: 2050 [2022-11-26 00:42:24,301 INFO L226 Difference]: Without dead ends: 1739 [2022-11-26 00:42:24,303 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 174 SyntacticMatches, 27 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1797 ImplicationChecksByTransitivity, 10.1s TimeCoverageRelationStatistics Valid=258, Invalid=2498, Unknown=0, NotChecked=0, Total=2756 [2022-11-26 00:42:24,304 INFO L413 NwaCegarLoop]: 50 mSDtfsCounter, 95 mSDsluCounter, 263 mSDsCounter, 0 mSdLazyCounter, 1221 mSolverCounterSat, 84 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 313 SdHoareTripleChecker+Invalid, 1305 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 84 IncrementalHoareTripleChecker+Valid, 1221 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-11-26 00:42:24,304 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [108 Valid, 313 Invalid, 1305 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [84 Valid, 1221 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-11-26 00:42:24,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1739 states. [2022-11-26 00:42:28,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1739 to 1727. [2022-11-26 00:42:28,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1727 states, 844 states have (on average 1.3092417061611374) internal successors, (1105), 845 states have internal predecessors, (1105), 829 states have call successors, (829), 53 states have call predecessors, (829), 53 states have return successors, (828), 828 states have call predecessors, (828), 828 states have call successors, (828) [2022-11-26 00:42:28,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1727 states to 1727 states and 2762 transitions. [2022-11-26 00:42:28,877 INFO L78 Accepts]: Start accepts. Automaton has 1727 states and 2762 transitions. Word has length 111 [2022-11-26 00:42:28,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:42:28,877 INFO L495 AbstractCegarLoop]: Abstraction has 1727 states and 2762 transitions. [2022-11-26 00:42:28,877 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 17 states have internal predecessors, (41), 7 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (17), 6 states have call predecessors, (17), 6 states have call successors, (17) [2022-11-26 00:42:28,878 INFO L276 IsEmpty]: Start isEmpty. Operand 1727 states and 2762 transitions. [2022-11-26 00:42:28,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2022-11-26 00:42:28,880 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:42:28,880 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 5, 4, 4, 4, 4, 4, 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] [2022-11-26 00:42:28,887 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-26 00:42:29,086 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:42:29,086 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:42:29,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:42:29,087 INFO L85 PathProgramCache]: Analyzing trace with hash -347612901, now seen corresponding path program 4 times [2022-11-26 00:42:29,087 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:42:29,087 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1516840528] [2022-11-26 00:42:29,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:42:29,087 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:42:29,097 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-26 00:42:29,098 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [802353496] [2022-11-26 00:42:29,098 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-26 00:42:29,098 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:42:29,098 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:42:29,101 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:42:29,102 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-26 00:42:29,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:42:29,190 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 80 conjunts are in the unsatisfiable core [2022-11-26 00:42:29,194 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:42:33,168 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 54 proven. 66 refuted. 0 times theorem prover too weak. 285 trivial. 0 not checked. [2022-11-26 00:42:33,168 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:42:51,341 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 68 proven. 49 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2022-11-26 00:42:51,341 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:42:51,341 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1516840528] [2022-11-26 00:42:51,342 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-26 00:42:51,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [802353496] [2022-11-26 00:42:51,342 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [802353496] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:42:51,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1834733319] [2022-11-26 00:42:51,343 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-26 00:42:51,343 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:42:51,344 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:42:51,344 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:42:51,344 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:42:57,365 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-26 00:42:57,368 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-26 00:42:57,382 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:43:18,212 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '52104#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:43:18,212 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:43:18,213 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-26 00:43:18,213 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 18] total 36 [2022-11-26 00:43:18,213 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1428451114] [2022-11-26 00:43:18,213 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-26 00:43:18,214 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-11-26 00:43:18,214 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:43:18,214 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-11-26 00:43:18,215 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=310, Invalid=2342, Unknown=0, NotChecked=0, Total=2652 [2022-11-26 00:43:18,215 INFO L87 Difference]: Start difference. First operand 1727 states and 2762 transitions. Second operand has 36 states, 35 states have (on average 2.085714285714286) internal successors, (73), 32 states have internal predecessors, (73), 12 states have call successors, (33), 3 states have call predecessors, (33), 3 states have return successors, (32), 12 states have call predecessors, (32), 12 states have call successors, (32) [2022-11-26 00:43:48,756 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-26 00:43:58,591 WARN L233 SmtUtils]: Spent 5.37s on a formula simplification that was a NOOP. DAG size: 96 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-26 00:44:18,726 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-26 00:44:23,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:44:23,439 INFO L93 Difference]: Finished difference Result 2045 states and 3240 transitions. [2022-11-26 00:44:23,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-11-26 00:44:23,442 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 35 states have (on average 2.085714285714286) internal successors, (73), 32 states have internal predecessors, (73), 12 states have call successors, (33), 3 states have call predecessors, (33), 3 states have return successors, (32), 12 states have call predecessors, (32), 12 states have call successors, (32) Word has length 111 [2022-11-26 00:44:23,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:44:23,452 INFO L225 Difference]: With dead ends: 2045 [2022-11-26 00:44:23,452 INFO L226 Difference]: Without dead ends: 2043 [2022-11-26 00:44:23,454 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 360 GetRequests, 265 SyntacticMatches, 16 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2654 ImplicationChecksByTransitivity, 58.7s TimeCoverageRelationStatistics Valid=930, Invalid=5550, Unknown=0, NotChecked=0, Total=6480 [2022-11-26 00:44:23,454 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 267 mSDsluCounter, 233 mSDsCounter, 0 mSdLazyCounter, 1636 mSolverCounterSat, 550 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 28.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 267 SdHoareTripleChecker+Valid, 277 SdHoareTripleChecker+Invalid, 2188 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 550 IncrementalHoareTripleChecker+Valid, 1636 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 28.2s IncrementalHoareTripleChecker+Time [2022-11-26 00:44:23,455 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [267 Valid, 277 Invalid, 2188 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [550 Valid, 1636 Invalid, 2 Unknown, 0 Unchecked, 28.2s Time] [2022-11-26 00:44:23,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2043 states. [2022-11-26 00:44:27,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2043 to 1901. [2022-11-26 00:44:27,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1901 states, 938 states have (on average 1.302771855010661) internal successors, (1222), 941 states have internal predecessors, (1222), 901 states have call successors, (901), 61 states have call predecessors, (901), 61 states have return successors, (900), 898 states have call predecessors, (900), 900 states have call successors, (900) [2022-11-26 00:44:27,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1901 states to 1901 states and 3023 transitions. [2022-11-26 00:44:27,988 INFO L78 Accepts]: Start accepts. Automaton has 1901 states and 3023 transitions. Word has length 111 [2022-11-26 00:44:27,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:44:27,989 INFO L495 AbstractCegarLoop]: Abstraction has 1901 states and 3023 transitions. [2022-11-26 00:44:27,989 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 35 states have (on average 2.085714285714286) internal successors, (73), 32 states have internal predecessors, (73), 12 states have call successors, (33), 3 states have call predecessors, (33), 3 states have return successors, (32), 12 states have call predecessors, (32), 12 states have call successors, (32) [2022-11-26 00:44:27,989 INFO L276 IsEmpty]: Start isEmpty. Operand 1901 states and 3023 transitions. [2022-11-26 00:44:27,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2022-11-26 00:44:27,992 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:44:27,992 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 6, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:44:27,999 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-11-26 00:44:28,198 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-11-26 00:44:28,199 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:44:28,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:44:28,199 INFO L85 PathProgramCache]: Analyzing trace with hash -1541942719, now seen corresponding path program 5 times [2022-11-26 00:44:28,199 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:44:28,199 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1558575413] [2022-11-26 00:44:28,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:44:28,200 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:44:28,225 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-26 00:44:28,226 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1531802628] [2022-11-26 00:44:28,226 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 00:44:28,226 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:44:28,226 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:44:28,227 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:44:28,256 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8eaecb9b-60bf-4077-9516-a4a4e05d0d07/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-26 00:44:29,095 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-26 00:44:29,095 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:44:29,098 INFO L263 TraceCheckSpWp]: Trace formula consists of 265 conjuncts, 79 conjunts are in the unsatisfiable core [2022-11-26 00:44:29,101 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:44:31,388 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 64 proven. 72 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2022-11-26 00:44:31,388 INFO L328 TraceCheckSpWp]: Computing backward predicates...