./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-crafted/zero_sum_const2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 2329fc70 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-crafted/zero_sum_const2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 1be1405ed24182ea691f06aafa4c0ada74bba78ab2a6f90fefc65156bb70df6c --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-2329fc7 [2022-12-14 15:30:33,895 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 15:30:33,897 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 15:30:33,909 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 15:30:33,910 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 15:30:33,910 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 15:30:33,911 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 15:30:33,912 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 15:30:33,913 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 15:30:33,914 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 15:30:33,915 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 15:30:33,915 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 15:30:33,916 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 15:30:33,916 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 15:30:33,917 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 15:30:33,918 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 15:30:33,918 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 15:30:33,919 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 15:30:33,920 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 15:30:33,921 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 15:30:33,922 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 15:30:33,923 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 15:30:33,924 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 15:30:33,925 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 15:30:33,927 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 15:30:33,927 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 15:30:33,927 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 15:30:33,928 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 15:30:33,928 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 15:30:33,929 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 15:30:33,929 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 15:30:33,930 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 15:30:33,930 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 15:30:33,932 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 15:30:33,933 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 15:30:33,933 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 15:30:33,934 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 15:30:33,934 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 15:30:33,934 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 15:30:33,935 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 15:30:33,935 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 15:30:33,936 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-12-14 15:30:33,956 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 15:30:33,956 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 15:30:33,957 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 15:30:33,957 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 15:30:33,957 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 15:30:33,957 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 15:30:33,958 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 15:30:33,958 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 15:30:33,958 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 15:30:33,958 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 15:30:33,958 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 15:30:33,958 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 15:30:33,958 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 15:30:33,958 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 15:30:33,959 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 15:30:33,959 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 15:30:33,959 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 15:30:33,959 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 15:30:33,960 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 15:30:33,960 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-14 15:30:33,960 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 15:30:33,960 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-14 15:30:33,960 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 15:30:33,960 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-12-14 15:30:33,960 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 15:30:33,960 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-12-14 15:30:33,960 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-14 15:30:33,961 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-12-14 15:30:33,961 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 15:30:33,961 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-12-14 15:30:33,961 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 15:30:33,961 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 15:30:33,961 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 15:30:33,961 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 15:30:33,961 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 15:30:33,962 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 15:30:33,962 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-12-14 15:30:33,962 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 15:30:33,962 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 15:30:33,962 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-12-14 15:30:33,962 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 15:30:33,962 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_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1be1405ed24182ea691f06aafa4c0ada74bba78ab2a6f90fefc65156bb70df6c [2022-12-14 15:30:34,135 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 15:30:34,155 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 15:30:34,158 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 15:30:34,159 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 15:30:34,159 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 15:30:34,160 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/array-crafted/zero_sum_const2.c [2022-12-14 15:30:36,713 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 15:30:36,827 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 15:30:36,828 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/sv-benchmarks/c/array-crafted/zero_sum_const2.c [2022-12-14 15:30:36,832 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/data/6bb6c35c1/8d521c452f2d4895b23203af826484e7/FLAG7351deb19 [2022-12-14 15:30:36,844 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/data/6bb6c35c1/8d521c452f2d4895b23203af826484e7 [2022-12-14 15:30:36,846 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 15:30:36,847 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 15:30:36,848 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 15:30:36,848 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 15:30:36,851 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 15:30:36,851 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 03:30:36" (1/1) ... [2022-12-14 15:30:36,852 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2e974ab4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:30:36, skipping insertion in model container [2022-12-14 15:30:36,852 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 03:30:36" (1/1) ... [2022-12-14 15:30:36,859 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 15:30:36,870 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 15:30:36,970 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_b6699097-a3b8-4290-909c-1415e9654460/sv-benchmarks/c/array-crafted/zero_sum_const2.c[406,419] [2022-12-14 15:30:36,983 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 15:30:36,990 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 15:30:36,999 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_b6699097-a3b8-4290-909c-1415e9654460/sv-benchmarks/c/array-crafted/zero_sum_const2.c[406,419] [2022-12-14 15:30:37,003 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 15:30:37,014 INFO L208 MainTranslator]: Completed translation [2022-12-14 15:30:37,015 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:30:37 WrapperNode [2022-12-14 15:30:37,015 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 15:30:37,015 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 15:30:37,016 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 15:30:37,016 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 15:30:37,021 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:30:37" (1/1) ... [2022-12-14 15:30:37,026 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:30:37" (1/1) ... [2022-12-14 15:30:37,039 INFO L138 Inliner]: procedures = 16, calls = 14, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 82 [2022-12-14 15:30:37,039 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 15:30:37,040 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 15:30:37,040 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 15:30:37,040 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 15:30:37,047 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:30:37" (1/1) ... [2022-12-14 15:30:37,047 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:30:37" (1/1) ... [2022-12-14 15:30:37,048 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:30:37" (1/1) ... [2022-12-14 15:30:37,048 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:30:37" (1/1) ... [2022-12-14 15:30:37,051 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:30:37" (1/1) ... [2022-12-14 15:30:37,054 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:30:37" (1/1) ... [2022-12-14 15:30:37,055 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:30:37" (1/1) ... [2022-12-14 15:30:37,055 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:30:37" (1/1) ... [2022-12-14 15:30:37,057 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 15:30:37,057 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 15:30:37,057 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 15:30:37,057 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 15:30:37,058 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:30:37" (1/1) ... [2022-12-14 15:30:37,062 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 15:30:37,070 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:30:37,080 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 15:30:37,082 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 15:30:37,117 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-14 15:30:37,117 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-12-14 15:30:37,118 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-12-14 15:30:37,118 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-12-14 15:30:37,118 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 15:30:37,118 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 15:30:37,118 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-12-14 15:30:37,177 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 15:30:37,179 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 15:30:37,286 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 15:30:37,318 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 15:30:37,318 INFO L300 CfgBuilder]: Removed 5 assume(true) statements. [2022-12-14 15:30:37,320 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 03:30:37 BoogieIcfgContainer [2022-12-14 15:30:37,320 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 15:30:37,322 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 15:30:37,322 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 15:30:37,324 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 15:30:37,325 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 03:30:36" (1/3) ... [2022-12-14 15:30:37,325 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3ada363d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 03:30:37, skipping insertion in model container [2022-12-14 15:30:37,325 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:30:37" (2/3) ... [2022-12-14 15:30:37,325 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3ada363d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 03:30:37, skipping insertion in model container [2022-12-14 15:30:37,325 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 03:30:37" (3/3) ... [2022-12-14 15:30:37,326 INFO L112 eAbstractionObserver]: Analyzing ICFG zero_sum_const2.c [2022-12-14 15:30:37,340 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 15:30:37,340 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-12-14 15:30:37,375 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 15:30:37,380 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;@1e1b4daf, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 15:30:37,380 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-12-14 15:30:37,384 INFO L276 IsEmpty]: Start isEmpty. Operand has 13 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 12 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:30:37,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-12-14 15:30:37,388 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:30:37,388 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:30:37,389 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:30:37,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:30:37,393 INFO L85 PathProgramCache]: Analyzing trace with hash -1853536887, now seen corresponding path program 1 times [2022-12-14 15:30:37,400 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:30:37,400 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1566687126] [2022-12-14 15:30:37,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:30:37,400 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:30:37,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:30:37,567 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:30:37,567 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:30:37,568 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1566687126] [2022-12-14 15:30:37,568 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1566687126] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 15:30:37,568 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 15:30:37,569 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 15:30:37,570 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1939802641] [2022-12-14 15:30:37,570 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 15:30:37,574 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 15:30:37,574 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:30:37,594 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 15:30:37,595 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 15:30:37,596 INFO L87 Difference]: Start difference. First operand has 13 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 12 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:30:37,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:30:37,635 INFO L93 Difference]: Finished difference Result 24 states and 35 transitions. [2022-12-14 15:30:37,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 15:30:37,637 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-12-14 15:30:37,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:30:37,642 INFO L225 Difference]: With dead ends: 24 [2022-12-14 15:30:37,642 INFO L226 Difference]: Without dead ends: 11 [2022-12-14 15:30:37,644 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 15:30:37,646 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:30:37,647 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 15:30:37,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2022-12-14 15:30:37,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2022-12-14 15:30:37,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:30:37,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 15 transitions. [2022-12-14 15:30:37,667 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 15 transitions. Word has length 9 [2022-12-14 15:30:37,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:30:37,668 INFO L495 AbstractCegarLoop]: Abstraction has 11 states and 15 transitions. [2022-12-14 15:30:37,668 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:30:37,668 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 15 transitions. [2022-12-14 15:30:37,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-12-14 15:30:37,668 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:30:37,668 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:30:37,669 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-12-14 15:30:37,669 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:30:37,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:30:37,669 INFO L85 PathProgramCache]: Analyzing trace with hash -288493454, now seen corresponding path program 1 times [2022-12-14 15:30:37,669 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:30:37,669 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1648819081] [2022-12-14 15:30:37,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:30:37,670 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:30:37,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:30:37,733 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 15:30:37,733 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:30:37,733 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1648819081] [2022-12-14 15:30:37,733 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1648819081] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 15:30:37,733 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 15:30:37,734 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-12-14 15:30:37,734 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2066668463] [2022-12-14 15:30:37,734 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 15:30:37,735 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 15:30:37,735 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:30:37,736 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 15:30:37,736 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-12-14 15:30:37,736 INFO L87 Difference]: Start difference. First operand 11 states and 15 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:30:37,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:30:37,767 INFO L93 Difference]: Finished difference Result 21 states and 31 transitions. [2022-12-14 15:30:37,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 15:30:37,768 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-12-14 15:30:37,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:30:37,768 INFO L225 Difference]: With dead ends: 21 [2022-12-14 15:30:37,768 INFO L226 Difference]: Without dead ends: 15 [2022-12-14 15:30:37,768 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-12-14 15:30:37,769 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:30:37,769 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 5 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 15:30:37,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-12-14 15:30:37,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2022-12-14 15:30:37,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 14 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:30:37,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 19 transitions. [2022-12-14 15:30:37,773 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 19 transitions. Word has length 10 [2022-12-14 15:30:37,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:30:37,773 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 19 transitions. [2022-12-14 15:30:37,773 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:30:37,773 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 19 transitions. [2022-12-14 15:30:37,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-12-14 15:30:37,773 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:30:37,774 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:30:37,774 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-12-14 15:30:37,774 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:30:37,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:30:37,774 INFO L85 PathProgramCache]: Analyzing trace with hash -890182023, now seen corresponding path program 1 times [2022-12-14 15:30:37,775 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:30:37,775 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [730802196] [2022-12-14 15:30:37,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:30:37,775 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:30:37,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:30:37,849 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:30:37,850 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:30:37,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [730802196] [2022-12-14 15:30:37,850 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [730802196] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:30:37,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [856367557] [2022-12-14 15:30:37,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:30:37,850 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:30:37,851 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:30:37,851 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:30:37,852 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-12-14 15:30:37,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:30:37,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 4 conjunts are in the unsatisfiable core [2022-12-14 15:30:37,905 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:30:37,950 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:30:37,950 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:30:37,969 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:30:37,969 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [856367557] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:30:37,969 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [655864074] [2022-12-14 15:30:37,983 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 15:30:37,984 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:30:37,986 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:30:37,990 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:30:37,990 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:30:38,082 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 15:30:38,083 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 15:30:38,101 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 15:30:38,139 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 15:30:38,229 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:30:38,232 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:30:38,244 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 15:30:38,244 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 15:30:38,296 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 15:30:38,441 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:30:38,670 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '220#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:30:38,670 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:30:38,670 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:30:38,670 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2022-12-14 15:30:38,671 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1379304799] [2022-12-14 15:30:38,671 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:30:38,671 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-12-14 15:30:38,671 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:30:38,672 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-12-14 15:30:38,672 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2022-12-14 15:30:38,672 INFO L87 Difference]: Start difference. First operand 15 states and 19 transitions. Second operand has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 7 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:30:38,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:30:38,702 INFO L93 Difference]: Finished difference Result 27 states and 35 transitions. [2022-12-14 15:30:38,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 15:30:38,703 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 7 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-12-14 15:30:38,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:30:38,703 INFO L225 Difference]: With dead ends: 27 [2022-12-14 15:30:38,703 INFO L226 Difference]: Without dead ends: 16 [2022-12-14 15:30:38,704 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 27 SyntacticMatches, 7 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2022-12-14 15:30:38,705 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:30:38,706 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 7 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 15:30:38,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-12-14 15:30:38,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2022-12-14 15:30:38,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 15 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:30:38,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2022-12-14 15:30:38,709 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 14 [2022-12-14 15:30:38,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:30:38,710 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2022-12-14 15:30:38,710 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 7 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:30:38,710 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2022-12-14 15:30:38,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-12-14 15:30:38,710 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:30:38,711 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:30:38,716 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-12-14 15:30:38,911 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2022-12-14 15:30:38,913 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:30:38,914 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:30:38,914 INFO L85 PathProgramCache]: Analyzing trace with hash 538682672, now seen corresponding path program 2 times [2022-12-14 15:30:38,915 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:30:38,915 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [48981918] [2022-12-14 15:30:38,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:30:38,916 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:30:38,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:30:39,086 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 15:30:39,086 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:30:39,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [48981918] [2022-12-14 15:30:39,087 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [48981918] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:30:39,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1698042416] [2022-12-14 15:30:39,087 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:30:39,087 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:30:39,087 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:30:39,088 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:30:39,089 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-12-14 15:30:39,133 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-12-14 15:30:39,133 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:30:39,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 4 conjunts are in the unsatisfiable core [2022-12-14 15:30:39,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:30:39,158 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 15:30:39,158 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:30:39,177 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 15:30:39,177 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1698042416] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:30:39,178 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1794401522] [2022-12-14 15:30:39,180 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 15:30:39,180 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:30:39,181 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:30:39,181 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:30:39,181 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:30:39,231 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 15:30:39,232 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 15:30:39,243 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 15:30:39,263 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 15:30:39,336 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:30:39,338 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:30:39,349 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 15:30:39,349 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 15:30:39,404 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 15:30:39,509 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:30:39,635 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '390#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:30:39,635 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:30:39,635 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:30:39,635 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2022-12-14 15:30:39,635 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2124336712] [2022-12-14 15:30:39,635 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:30:39,636 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-12-14 15:30:39,636 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:30:39,636 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-12-14 15:30:39,637 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2022-12-14 15:30:39,637 INFO L87 Difference]: Start difference. First operand 16 states and 20 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:30:39,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:30:39,676 INFO L93 Difference]: Finished difference Result 29 states and 39 transitions. [2022-12-14 15:30:39,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-12-14 15:30:39,676 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2022-12-14 15:30:39,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:30:39,677 INFO L225 Difference]: With dead ends: 29 [2022-12-14 15:30:39,677 INFO L226 Difference]: Without dead ends: 20 [2022-12-14 15:30:39,677 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 34 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2022-12-14 15:30:39,678 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:30:39,679 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 7 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 15:30:39,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-12-14 15:30:39,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2022-12-14 15:30:39,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.263157894736842) internal successors, (24), 19 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:30:39,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2022-12-14 15:30:39,689 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 15 [2022-12-14 15:30:39,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:30:39,689 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2022-12-14 15:30:39,689 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:30:39,690 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2022-12-14 15:30:39,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-12-14 15:30:39,690 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:30:39,690 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:30:39,695 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-12-14 15:30:39,891 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:30:39,892 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:30:39,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:30:39,892 INFO L85 PathProgramCache]: Analyzing trace with hash 1761179401, now seen corresponding path program 3 times [2022-12-14 15:30:39,892 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:30:39,893 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [849735907] [2022-12-14 15:30:39,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:30:39,893 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:30:39,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:30:40,754 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:30:40,754 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:30:40,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [849735907] [2022-12-14 15:30:40,754 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [849735907] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:30:40,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [557930614] [2022-12-14 15:30:40,755 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:30:40,755 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:30:40,755 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:30:40,756 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:30:40,757 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-12-14 15:30:40,800 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:30:40,800 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:30:40,801 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 42 conjunts are in the unsatisfiable core [2022-12-14 15:30:40,803 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:30:41,015 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-12-14 15:30:41,015 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:30:41,190 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 15:30:41,190 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 35 treesize of output 51 [2022-12-14 15:30:41,244 INFO L321 Elim1Store]: treesize reduction 34, result has 20.9 percent of original size [2022-12-14 15:30:41,244 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 36 treesize of output 18 [2022-12-14 15:30:41,273 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-12-14 15:30:41,273 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [557930614] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:30:41,273 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [631282673] [2022-12-14 15:30:41,274 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 15:30:41,274 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:30:41,275 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:30:41,275 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:30:41,275 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:30:41,314 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 15:30:41,314 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-12-14 15:30:41,354 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 15:30:41,355 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 15:30:41,375 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 15:30:41,425 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:30:41,427 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:30:41,437 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 15:30:41,437 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 15:30:41,474 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 15:30:41,541 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:30:41,732 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '613#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:30:41,733 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:30:41,733 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:30:41,733 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10, 10] total 25 [2022-12-14 15:30:41,733 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1404032495] [2022-12-14 15:30:41,733 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:30:41,734 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-12-14 15:30:41,734 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:30:41,735 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-12-14 15:30:41,735 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=772, Unknown=0, NotChecked=0, Total=870 [2022-12-14 15:30:41,736 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand has 25 states, 25 states have (on average 1.96) internal successors, (49), 25 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:30:41,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:30:41,900 INFO L93 Difference]: Finished difference Result 33 states and 40 transitions. [2022-12-14 15:30:41,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-12-14 15:30:41,901 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.96) internal successors, (49), 25 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2022-12-14 15:30:41,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:30:41,901 INFO L225 Difference]: With dead ends: 33 [2022-12-14 15:30:41,901 INFO L226 Difference]: Without dead ends: 30 [2022-12-14 15:30:41,902 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 39 SyntacticMatches, 6 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 273 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=116, Invalid=940, Unknown=0, NotChecked=0, Total=1056 [2022-12-14 15:30:41,903 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 221 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 224 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 221 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:30:41,903 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 21 Invalid, 224 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 221 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:30:41,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-12-14 15:30:41,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 28. [2022-12-14 15:30:41,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.2962962962962963) internal successors, (35), 27 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:30:41,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 35 transitions. [2022-12-14 15:30:41,909 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 35 transitions. Word has length 19 [2022-12-14 15:30:41,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:30:41,909 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 35 transitions. [2022-12-14 15:30:41,909 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.96) internal successors, (49), 25 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:30:41,909 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 35 transitions. [2022-12-14 15:30:41,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-12-14 15:30:41,909 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:30:41,909 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:30:41,914 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-12-14 15:30:42,110 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:30:42,112 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:30:42,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:30:42,113 INFO L85 PathProgramCache]: Analyzing trace with hash 1573827773, now seen corresponding path program 4 times [2022-12-14 15:30:42,113 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:30:42,114 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [283936146] [2022-12-14 15:30:42,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:30:42,114 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:30:42,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:30:42,211 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-12-14 15:30:42,211 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:30:42,211 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [283936146] [2022-12-14 15:30:42,211 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [283936146] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:30:42,211 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [156747703] [2022-12-14 15:30:42,212 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:30:42,212 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:30:42,212 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:30:42,213 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:30:42,213 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-12-14 15:30:42,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:30:42,261 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 8 conjunts are in the unsatisfiable core [2022-12-14 15:30:42,262 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:30:42,299 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-12-14 15:30:42,299 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:30:42,328 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-12-14 15:30:42,328 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [156747703] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:30:42,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1083909356] [2022-12-14 15:30:42,330 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 15:30:42,330 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:30:42,330 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:30:42,330 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:30:42,331 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:30:42,375 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 15:30:42,375 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-12-14 15:30:42,414 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 15:30:42,414 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 15:30:42,433 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 15:30:42,472 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:30:42,474 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:30:42,483 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 15:30:42,483 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 15:30:42,519 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 15:30:42,594 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:30:42,707 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '860#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:30:42,707 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:30:42,707 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:30:42,707 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 13 [2022-12-14 15:30:42,707 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [695054906] [2022-12-14 15:30:42,707 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:30:42,708 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-12-14 15:30:42,708 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:30:42,708 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-12-14 15:30:42,709 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=239, Unknown=0, NotChecked=0, Total=306 [2022-12-14 15:30:42,709 INFO L87 Difference]: Start difference. First operand 28 states and 35 transitions. Second operand has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:30:42,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:30:42,798 INFO L93 Difference]: Finished difference Result 62 states and 77 transitions. [2022-12-14 15:30:42,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-12-14 15:30:42,798 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2022-12-14 15:30:42,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:30:42,799 INFO L225 Difference]: With dead ends: 62 [2022-12-14 15:30:42,799 INFO L226 Difference]: Without dead ends: 37 [2022-12-14 15:30:42,800 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 45 SyntacticMatches, 5 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 145 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=91, Invalid=329, Unknown=0, NotChecked=0, Total=420 [2022-12-14 15:30:42,800 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 26 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 76 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 153 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 76 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:30:42,801 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 9 Invalid, 153 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [76 Valid, 77 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:30:42,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-12-14 15:30:42,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 30. [2022-12-14 15:30:42,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 29 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:30:42,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 36 transitions. [2022-12-14 15:30:42,805 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 36 transitions. Word has length 20 [2022-12-14 15:30:42,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:30:42,805 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 36 transitions. [2022-12-14 15:30:42,806 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:30:42,806 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 36 transitions. [2022-12-14 15:30:42,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-12-14 15:30:42,806 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:30:42,806 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:30:42,810 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-12-14 15:30:43,007 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:30:43,007 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:30:43,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:30:43,008 INFO L85 PathProgramCache]: Analyzing trace with hash 1543982644, now seen corresponding path program 5 times [2022-12-14 15:30:43,008 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:30:43,008 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1088104554] [2022-12-14 15:30:43,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:30:43,009 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:30:43,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:30:43,111 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 15:30:43,111 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:30:43,112 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1088104554] [2022-12-14 15:30:43,112 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1088104554] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:30:43,112 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1549014047] [2022-12-14 15:30:43,112 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:30:43,112 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:30:43,112 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:30:43,113 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:30:43,114 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-12-14 15:30:43,162 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-12-14 15:30:43,162 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:30:43,163 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 8 conjunts are in the unsatisfiable core [2022-12-14 15:30:43,164 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:30:43,215 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 15:30:43,215 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:30:43,263 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 15:30:43,263 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1549014047] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:30:43,263 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [144456973] [2022-12-14 15:30:43,265 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 15:30:43,265 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:30:43,265 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:30:43,265 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:30:43,265 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:30:43,307 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 15:30:43,307 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-12-14 15:30:43,354 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 15:30:43,354 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 15:30:43,375 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 15:30:43,426 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:30:43,427 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 15:30:43,440 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 15:30:43,440 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 245 treesize of output 248 [2022-12-14 15:30:43,495 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 15:30:43,569 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:30:43,756 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1170#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:30:43,756 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:30:43,756 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:30:43,756 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2022-12-14 15:30:43,756 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2032778691] [2022-12-14 15:30:43,756 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:30:43,756 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-12-14 15:30:43,756 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:30:43,757 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-12-14 15:30:43,757 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=269, Unknown=0, NotChecked=0, Total=342 [2022-12-14 15:30:43,757 INFO L87 Difference]: Start difference. First operand 30 states and 36 transitions. Second operand has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:30:43,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:30:43,831 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2022-12-14 15:30:43,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-12-14 15:30:43,831 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2022-12-14 15:30:43,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:30:43,832 INFO L225 Difference]: With dead ends: 34 [2022-12-14 15:30:43,832 INFO L226 Difference]: Without dead ends: 25 [2022-12-14 15:30:43,832 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 38 SyntacticMatches, 15 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 305 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=111, Invalid=441, Unknown=0, NotChecked=0, Total=552 [2022-12-14 15:30:43,832 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 89 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 146 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 89 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:30:43,833 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 7 Invalid, 146 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 89 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 15:30:43,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-12-14 15:30:43,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-12-14 15:30:43,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 24 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:30:43,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2022-12-14 15:30:43,835 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 21 [2022-12-14 15:30:43,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:30:43,836 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2022-12-14 15:30:43,836 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:30:43,836 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2022-12-14 15:30:43,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-12-14 15:30:43,836 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:30:43,836 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:30:43,841 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-12-14 15:30:44,037 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:30:44,038 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:30:44,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:30:44,039 INFO L85 PathProgramCache]: Analyzing trace with hash 1017795833, now seen corresponding path program 6 times [2022-12-14 15:30:44,039 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:30:44,039 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [331538028] [2022-12-14 15:30:44,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:30:44,040 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:30:44,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:30:45,404 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:30:45,404 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:30:45,405 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [331538028] [2022-12-14 15:30:45,405 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [331538028] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:30:45,405 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [853614522] [2022-12-14 15:30:45,405 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:30:45,405 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:30:45,405 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:30:45,406 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:30:45,407 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-12-14 15:30:45,453 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:30:45,453 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:30:45,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 64 conjunts are in the unsatisfiable core [2022-12-14 15:30:45,457 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:30:45,912 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 24 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-12-14 15:30:45,912 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:30:46,622 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 15:30:46,623 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 53 treesize of output 108 [2022-12-14 15:30:46,798 INFO L321 Elim1Store]: treesize reduction 84, result has 13.4 percent of original size [2022-12-14 15:30:46,798 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 52 treesize of output 23 [2022-12-14 15:30:46,911 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-12-14 15:30:46,911 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [853614522] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:30:46,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1523961266] [2022-12-14 15:30:46,913 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 15:30:46,913 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:30:46,913 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:30:46,913 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:30:46,913 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:30:46,953 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 15:30:46,953 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 15:30:46,963 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 15:30:46,980 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 15:30:47,019 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:30:47,020 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 15:30:47,038 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 15:30:47,039 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 245 treesize of output 248 [2022-12-14 15:30:47,106 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 15:30:47,172 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:30:47,517 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1473#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:30:47,517 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:30:47,517 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:30:47,517 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 14, 16] total 45 [2022-12-14 15:30:47,518 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1383194515] [2022-12-14 15:30:47,518 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:30:47,518 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-12-14 15:30:47,518 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:30:47,519 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-12-14 15:30:47,520 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=2254, Unknown=0, NotChecked=0, Total=2450 [2022-12-14 15:30:47,521 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand has 45 states, 45 states have (on average 1.4222222222222223) internal successors, (64), 45 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:30:49,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:30:49,232 INFO L93 Difference]: Finished difference Result 47 states and 56 transitions. [2022-12-14 15:30:49,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-12-14 15:30:49,233 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.4222222222222223) internal successors, (64), 45 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2022-12-14 15:30:49,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:30:49,233 INFO L225 Difference]: With dead ends: 47 [2022-12-14 15:30:49,233 INFO L226 Difference]: Without dead ends: 44 [2022-12-14 15:30:49,234 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 39 SyntacticMatches, 6 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1019 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=432, Invalid=4260, Unknown=0, NotChecked=0, Total=4692 [2022-12-14 15:30:49,235 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 15 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 620 mSolverCounterSat, 91 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 711 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 91 IncrementalHoareTripleChecker+Valid, 620 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 15:30:49,235 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 82 Invalid, 711 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [91 Valid, 620 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 15:30:49,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-12-14 15:30:49,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 35. [2022-12-14 15:30:49,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.2352941176470589) internal successors, (42), 34 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:30:49,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 42 transitions. [2022-12-14 15:30:49,240 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 42 transitions. Word has length 24 [2022-12-14 15:30:49,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:30:49,241 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 42 transitions. [2022-12-14 15:30:49,241 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 1.4222222222222223) internal successors, (64), 45 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:30:49,241 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 42 transitions. [2022-12-14 15:30:49,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-12-14 15:30:49,241 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:30:49,241 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:30:49,246 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-12-14 15:30:49,442 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2022-12-14 15:30:49,443 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:30:49,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:30:49,444 INFO L85 PathProgramCache]: Analyzing trace with hash -1127760005, now seen corresponding path program 7 times [2022-12-14 15:30:49,445 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:30:49,445 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1139895475] [2022-12-14 15:30:49,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:30:49,446 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:30:49,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:30:49,527 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-12-14 15:30:49,528 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:30:49,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1139895475] [2022-12-14 15:30:49,528 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1139895475] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:30:49,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1386903266] [2022-12-14 15:30:49,528 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:30:49,528 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:30:49,528 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:30:49,529 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:30:49,530 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-12-14 15:30:49,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:30:49,582 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 10 conjunts are in the unsatisfiable core [2022-12-14 15:30:49,583 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:30:49,636 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-12-14 15:30:49,636 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:30:49,677 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-12-14 15:30:49,678 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1386903266] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:30:49,678 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1020548497] [2022-12-14 15:30:49,679 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 15:30:49,679 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:30:49,680 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:30:49,680 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:30:49,680 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:30:49,725 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 15:30:49,725 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-12-14 15:30:49,767 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 15:30:49,767 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 15:30:49,784 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 15:30:49,821 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:30:49,822 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 15:30:49,840 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 15:30:49,841 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 245 treesize of output 248 [2022-12-14 15:30:49,882 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 15:30:49,956 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:30:50,179 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1824#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:30:50,179 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:30:50,179 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:30:50,179 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 16 [2022-12-14 15:30:50,179 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1278774449] [2022-12-14 15:30:50,179 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:30:50,180 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-12-14 15:30:50,180 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:30:50,180 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-12-14 15:30:50,180 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=330, Unknown=0, NotChecked=0, Total=420 [2022-12-14 15:30:50,181 INFO L87 Difference]: Start difference. First operand 35 states and 42 transitions. Second operand has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:30:50,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:30:50,281 INFO L93 Difference]: Finished difference Result 76 states and 91 transitions. [2022-12-14 15:30:50,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-12-14 15:30:50,281 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2022-12-14 15:30:50,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:30:50,282 INFO L225 Difference]: With dead ends: 76 [2022-12-14 15:30:50,282 INFO L226 Difference]: Without dead ends: 44 [2022-12-14 15:30:50,283 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 45 SyntacticMatches, 19 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 389 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=128, Invalid=472, Unknown=0, NotChecked=0, Total=600 [2022-12-14 15:30:50,283 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 36 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 119 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 204 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 119 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:30:50,284 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 13 Invalid, 204 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [119 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:30:50,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-12-14 15:30:50,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 37. [2022-12-14 15:30:50,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.1944444444444444) internal successors, (43), 36 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:30:50,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 43 transitions. [2022-12-14 15:30:50,291 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 43 transitions. Word has length 25 [2022-12-14 15:30:50,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:30:50,291 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 43 transitions. [2022-12-14 15:30:50,291 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:30:50,291 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 43 transitions. [2022-12-14 15:30:50,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-12-14 15:30:50,291 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:30:50,291 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:30:50,296 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-12-14 15:30:50,492 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:30:50,493 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:30:50,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:30:50,494 INFO L85 PathProgramCache]: Analyzing trace with hash -1038649244, now seen corresponding path program 8 times [2022-12-14 15:30:50,495 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:30:50,495 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [217868618] [2022-12-14 15:30:50,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:30:50,495 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:30:50,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:30:50,601 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-12-14 15:30:50,601 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:30:50,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [217868618] [2022-12-14 15:30:50,601 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [217868618] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:30:50,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1208145771] [2022-12-14 15:30:50,601 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:30:50,601 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:30:50,602 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:30:50,602 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:30:50,603 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-12-14 15:30:50,656 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-12-14 15:30:50,656 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:30:50,657 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 10 conjunts are in the unsatisfiable core [2022-12-14 15:30:50,658 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:30:50,722 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-12-14 15:30:50,722 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:30:50,774 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-12-14 15:30:50,774 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1208145771] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:30:50,774 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1451895181] [2022-12-14 15:30:50,775 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 15:30:50,775 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:30:50,775 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:30:50,776 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:30:50,776 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:30:50,806 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 15:30:50,806 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-12-14 15:30:50,840 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 15:30:50,840 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 15:30:50,860 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 15:30:50,894 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:30:50,896 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:30:50,904 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 15:30:50,904 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 15:30:50,940 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 15:30:51,006 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:30:51,288 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2211#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:30:51,288 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:30:51,288 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:30:51,288 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2022-12-14 15:30:51,288 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [885557486] [2022-12-14 15:30:51,289 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:30:51,289 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-12-14 15:30:51,289 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:30:51,289 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-12-14 15:30:51,290 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=367, Unknown=0, NotChecked=0, Total=462 [2022-12-14 15:30:51,290 INFO L87 Difference]: Start difference. First operand 37 states and 43 transitions. Second operand has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:30:51,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:30:51,416 INFO L93 Difference]: Finished difference Result 41 states and 47 transitions. [2022-12-14 15:30:51,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-12-14 15:30:51,417 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2022-12-14 15:30:51,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:30:51,417 INFO L225 Difference]: With dead ends: 41 [2022-12-14 15:30:51,417 INFO L226 Difference]: Without dead ends: 30 [2022-12-14 15:30:51,417 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 47 SyntacticMatches, 20 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 494 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=148, Invalid=608, Unknown=0, NotChecked=0, Total=756 [2022-12-14 15:30:51,418 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 16 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 123 mSolverCounterSat, 82 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 205 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 82 IncrementalHoareTripleChecker+Valid, 123 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:30:51,418 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 9 Invalid, 205 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [82 Valid, 123 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:30:51,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-12-14 15:30:51,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2022-12-14 15:30:51,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.1724137931034482) internal successors, (34), 29 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:30:51,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2022-12-14 15:30:51,427 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 26 [2022-12-14 15:30:51,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:30:51,427 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2022-12-14 15:30:51,427 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:30:51,427 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2022-12-14 15:30:51,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-12-14 15:30:51,427 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:30:51,428 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:30:51,433 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-12-14 15:30:51,628 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:30:51,628 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:30:51,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:30:51,629 INFO L85 PathProgramCache]: Analyzing trace with hash -1344296823, now seen corresponding path program 9 times [2022-12-14 15:30:51,629 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:30:51,629 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [165091505] [2022-12-14 15:30:51,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:30:51,629 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:30:51,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:30:53,283 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:30:53,283 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:30:53,284 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [165091505] [2022-12-14 15:30:53,284 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [165091505] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:30:53,284 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [950248644] [2022-12-14 15:30:53,284 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:30:53,284 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:30:53,284 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:30:53,285 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:30:53,285 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-12-14 15:30:53,333 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:30:53,334 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:30:53,335 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 83 conjunts are in the unsatisfiable core [2022-12-14 15:30:53,337 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:30:54,005 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 4 proven. 40 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 15:30:54,006 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:30:54,740 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 15:30:54,740 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 69 treesize of output 185 [2022-12-14 15:30:55,060 INFO L321 Elim1Store]: treesize reduction 156, result has 9.8 percent of original size [2022-12-14 15:30:55,060 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 70 treesize of output 30 [2022-12-14 15:30:55,202 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 47 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-12-14 15:30:55,202 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [950248644] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:30:55,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [354635482] [2022-12-14 15:30:55,203 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 15:30:55,203 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:30:55,204 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:30:55,204 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:30:55,204 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:30:55,234 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 15:30:55,235 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 15:30:55,241 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 15:30:55,255 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 15:30:55,286 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:30:55,288 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:30:55,295 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 15:30:55,295 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 15:30:55,323 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 15:30:55,387 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:30:56,476 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2581#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:30:56,476 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:30:56,476 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:30:56,476 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 16, 20] total 56 [2022-12-14 15:30:56,476 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1207970461] [2022-12-14 15:30:56,476 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:30:56,477 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2022-12-14 15:30:56,477 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:30:56,478 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2022-12-14 15:30:56,479 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=307, Invalid=3353, Unknown=0, NotChecked=0, Total=3660 [2022-12-14 15:30:56,479 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand has 56 states, 56 states have (on average 1.3928571428571428) internal successors, (78), 56 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:00,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:31:00,025 INFO L93 Difference]: Finished difference Result 72 states and 85 transitions. [2022-12-14 15:31:00,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-12-14 15:31:00,025 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 1.3928571428571428) internal successors, (78), 56 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2022-12-14 15:31:00,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:31:00,026 INFO L225 Difference]: With dead ends: 72 [2022-12-14 15:31:00,026 INFO L226 Difference]: Without dead ends: 68 [2022-12-14 15:31:00,028 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 32 SyntacticMatches, 22 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2722 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=797, Invalid=7575, Unknown=0, NotChecked=0, Total=8372 [2022-12-14 15:31:00,028 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 20 mSDsluCounter, 116 mSDsCounter, 0 mSdLazyCounter, 1139 mSolverCounterSat, 114 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 1253 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 114 IncrementalHoareTripleChecker+Valid, 1139 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-12-14 15:31:00,028 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 121 Invalid, 1253 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [114 Valid, 1139 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-12-14 15:31:00,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2022-12-14 15:31:00,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 44. [2022-12-14 15:31:00,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 43 states have (on average 1.2325581395348837) internal successors, (53), 43 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:00,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 53 transitions. [2022-12-14 15:31:00,038 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 53 transitions. Word has length 29 [2022-12-14 15:31:00,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:31:00,038 INFO L495 AbstractCegarLoop]: Abstraction has 44 states and 53 transitions. [2022-12-14 15:31:00,038 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 1.3928571428571428) internal successors, (78), 56 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:00,039 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 53 transitions. [2022-12-14 15:31:00,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-12-14 15:31:00,039 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:31:00,039 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:31:00,043 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2022-12-14 15:31:00,240 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:31:00,241 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:31:00,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:31:00,242 INFO L85 PathProgramCache]: Analyzing trace with hash 894922393, now seen corresponding path program 10 times [2022-12-14 15:31:00,242 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:31:00,243 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1343887332] [2022-12-14 15:31:00,243 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:31:00,243 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:31:00,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:31:00,359 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-12-14 15:31:00,360 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:31:00,360 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1343887332] [2022-12-14 15:31:00,360 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1343887332] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:31:00,360 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [260314247] [2022-12-14 15:31:00,360 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:31:00,360 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:31:00,360 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:31:00,361 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:31:00,363 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-12-14 15:31:00,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:31:00,417 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 12 conjunts are in the unsatisfiable core [2022-12-14 15:31:00,419 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:31:00,489 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-12-14 15:31:00,489 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:31:00,551 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-12-14 15:31:00,551 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [260314247] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:31:00,551 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1456534798] [2022-12-14 15:31:00,553 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 15:31:00,553 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:31:00,553 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:31:00,553 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:31:00,553 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:31:00,596 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 15:31:00,596 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 15:31:00,606 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 15:31:00,622 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 15:31:00,659 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:31:00,661 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:31:00,671 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 15:31:00,671 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 15:31:00,705 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 15:31:00,769 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:31:01,092 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3057#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:31:01,092 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:31:01,092 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:31:01,092 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2022-12-14 15:31:01,092 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1315040742] [2022-12-14 15:31:01,092 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:31:01,092 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-12-14 15:31:01,093 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:31:01,093 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-12-14 15:31:01,093 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=475, Unknown=0, NotChecked=0, Total=600 [2022-12-14 15:31:01,094 INFO L87 Difference]: Start difference. First operand 44 states and 53 transitions. Second operand has 20 states, 20 states have (on average 1.55) internal successors, (31), 20 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:01,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:31:01,274 INFO L93 Difference]: Finished difference Result 109 states and 130 transitions. [2022-12-14 15:31:01,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-12-14 15:31:01,274 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.55) internal successors, (31), 20 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2022-12-14 15:31:01,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:31:01,275 INFO L225 Difference]: With dead ends: 109 [2022-12-14 15:31:01,275 INFO L226 Difference]: Without dead ends: 57 [2022-12-14 15:31:01,275 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 52 SyntacticMatches, 26 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 642 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=185, Invalid=685, Unknown=0, NotChecked=0, Total=870 [2022-12-14 15:31:01,275 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 21 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 149 mSolverCounterSat, 143 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 292 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 143 IncrementalHoareTripleChecker+Valid, 149 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:31:01,276 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 15 Invalid, 292 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [143 Valid, 149 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:31:01,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2022-12-14 15:31:01,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 50. [2022-12-14 15:31:01,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.163265306122449) internal successors, (57), 49 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:01,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 57 transitions. [2022-12-14 15:31:01,287 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 57 transitions. Word has length 30 [2022-12-14 15:31:01,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:31:01,287 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 57 transitions. [2022-12-14 15:31:01,287 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.55) internal successors, (31), 20 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:01,287 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 57 transitions. [2022-12-14 15:31:01,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-12-14 15:31:01,287 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:31:01,288 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:31:01,292 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2022-12-14 15:31:01,488 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-12-14 15:31:01,489 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:31:01,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:31:01,490 INFO L85 PathProgramCache]: Analyzing trace with hash 320453938, now seen corresponding path program 11 times [2022-12-14 15:31:01,490 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:31:01,490 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1889237441] [2022-12-14 15:31:01,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:31:01,491 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:31:01,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:31:01,623 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2022-12-14 15:31:01,623 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:31:01,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1889237441] [2022-12-14 15:31:01,623 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1889237441] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:31:01,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [780600106] [2022-12-14 15:31:01,623 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:31:01,623 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:31:01,623 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:31:01,624 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:31:01,625 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-12-14 15:31:01,684 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-12-14 15:31:01,684 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:31:01,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 12 conjunts are in the unsatisfiable core [2022-12-14 15:31:01,686 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:31:01,744 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2022-12-14 15:31:01,744 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:31:01,798 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2022-12-14 15:31:01,798 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [780600106] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:31:01,798 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [819175691] [2022-12-14 15:31:01,799 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 15:31:01,799 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:31:01,800 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:31:01,800 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:31:01,800 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:31:01,837 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 15:31:01,837 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-12-14 15:31:01,877 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 15:31:01,878 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 15:31:01,899 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 15:31:01,950 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:31:01,952 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:31:01,961 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 15:31:01,961 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 15:31:01,992 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 15:31:02,058 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:31:02,331 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3577#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:31:02,331 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:31:02,331 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:31:02,331 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2022-12-14 15:31:02,331 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1013329355] [2022-12-14 15:31:02,331 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:31:02,331 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-12-14 15:31:02,331 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:31:02,332 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-12-14 15:31:02,332 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=479, Unknown=0, NotChecked=0, Total=600 [2022-12-14 15:31:02,332 INFO L87 Difference]: Start difference. First operand 50 states and 57 transitions. Second operand has 20 states, 20 states have (on average 1.55) internal successors, (31), 20 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:02,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:31:02,486 INFO L93 Difference]: Finished difference Result 54 states and 61 transitions. [2022-12-14 15:31:02,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-12-14 15:31:02,486 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.55) internal successors, (31), 20 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2022-12-14 15:31:02,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:31:02,487 INFO L225 Difference]: With dead ends: 54 [2022-12-14 15:31:02,487 INFO L226 Difference]: Without dead ends: 41 [2022-12-14 15:31:02,487 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 59 SyntacticMatches, 25 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 724 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=192, Invalid=800, Unknown=0, NotChecked=0, Total=992 [2022-12-14 15:31:02,487 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 15 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 202 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 289 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 202 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:31:02,488 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 13 Invalid, 289 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 202 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:31:02,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-12-14 15:31:02,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 35. [2022-12-14 15:31:02,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.1470588235294117) internal successors, (39), 34 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:02,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2022-12-14 15:31:02,498 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 32 [2022-12-14 15:31:02,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:31:02,498 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2022-12-14 15:31:02,498 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.55) internal successors, (31), 20 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:02,499 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2022-12-14 15:31:02,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-12-14 15:31:02,499 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:31:02,499 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:31:02,504 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-12-14 15:31:02,700 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-12-14 15:31:02,700 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:31:02,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:31:02,702 INFO L85 PathProgramCache]: Analyzing trace with hash -859815047, now seen corresponding path program 12 times [2022-12-14 15:31:02,702 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:31:02,703 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [351628809] [2022-12-14 15:31:02,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:31:02,704 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:31:02,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:31:05,432 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 3 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:31:05,432 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:31:05,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [351628809] [2022-12-14 15:31:05,433 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [351628809] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:31:05,433 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1749061284] [2022-12-14 15:31:05,433 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:31:05,433 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:31:05,433 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:31:05,434 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:31:05,434 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-12-14 15:31:05,495 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:31:05,495 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:31:05,497 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 90 conjunts are in the unsatisfiable core [2022-12-14 15:31:05,499 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:31:06,269 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-12-14 15:31:06,269 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:31:07,076 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 15:31:07,076 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 86 treesize of output 285 [2022-12-14 15:31:08,143 INFO L321 Elim1Store]: treesize reduction 250, result has 7.7 percent of original size [2022-12-14 15:31:08,143 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 87 treesize of output 36 [2022-12-14 15:31:08,188 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-12-14 15:31:08,188 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1749061284] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:31:08,188 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1056849591] [2022-12-14 15:31:08,189 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 15:31:08,189 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:31:08,189 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:31:08,189 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:31:08,189 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:31:08,222 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 15:31:08,222 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 15:31:08,230 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 15:31:08,244 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 15:31:08,279 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:31:08,279 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 15:31:08,297 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 15:31:08,297 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 245 treesize of output 248 [2022-12-14 15:31:08,340 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 15:31:08,424 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:31:09,515 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4016#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:31:09,515 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:31:09,515 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:31:09,515 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 16, 16] total 57 [2022-12-14 15:31:09,516 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [605712542] [2022-12-14 15:31:09,516 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:31:09,516 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2022-12-14 15:31:09,516 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:31:09,517 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2022-12-14 15:31:09,518 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=3556, Unknown=0, NotChecked=0, Total=3782 [2022-12-14 15:31:09,518 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand has 57 states, 57 states have (on average 1.543859649122807) internal successors, (88), 57 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:12,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:31:12,502 INFO L93 Difference]: Finished difference Result 63 states and 72 transitions. [2022-12-14 15:31:12,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-12-14 15:31:12,503 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 1.543859649122807) internal successors, (88), 57 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2022-12-14 15:31:12,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:31:12,503 INFO L225 Difference]: With dead ends: 63 [2022-12-14 15:31:12,503 INFO L226 Difference]: Without dead ends: 60 [2022-12-14 15:31:12,504 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 50 SyntacticMatches, 23 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3130 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=587, Invalid=7785, Unknown=0, NotChecked=0, Total=8372 [2022-12-14 15:31:12,504 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 8 mSDsluCounter, 140 mSDsCounter, 0 mSdLazyCounter, 1297 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 145 SdHoareTripleChecker+Invalid, 1384 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 1297 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-12-14 15:31:12,505 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 145 Invalid, 1384 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 1297 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-12-14 15:31:12,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2022-12-14 15:31:12,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 49. [2022-12-14 15:31:12,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.1666666666666667) internal successors, (56), 48 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:12,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 56 transitions. [2022-12-14 15:31:12,524 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 56 transitions. Word has length 34 [2022-12-14 15:31:12,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:31:12,524 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 56 transitions. [2022-12-14 15:31:12,524 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 1.543859649122807) internal successors, (88), 57 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:12,524 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 56 transitions. [2022-12-14 15:31:12,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-12-14 15:31:12,525 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:31:12,525 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:31:12,529 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2022-12-14 15:31:12,726 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:31:12,726 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:31:12,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:31:12,728 INFO L85 PathProgramCache]: Analyzing trace with hash -1941427653, now seen corresponding path program 13 times [2022-12-14 15:31:12,728 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:31:12,728 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1409034810] [2022-12-14 15:31:12,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:31:12,729 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:31:12,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:31:12,850 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-12-14 15:31:12,850 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:31:12,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1409034810] [2022-12-14 15:31:12,850 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1409034810] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:31:12,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1662608962] [2022-12-14 15:31:12,850 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:31:12,850 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:31:12,851 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:31:12,851 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:31:12,852 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-12-14 15:31:12,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:31:12,900 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 14 conjunts are in the unsatisfiable core [2022-12-14 15:31:12,901 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:31:12,975 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-12-14 15:31:12,975 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:31:13,030 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-12-14 15:31:13,030 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1662608962] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:31:13,030 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [753648712] [2022-12-14 15:31:13,032 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 15:31:13,032 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:31:13,032 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:31:13,032 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:31:13,032 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:31:13,066 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 15:31:13,066 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 15:31:13,073 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 15:31:13,087 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 15:31:13,121 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:31:13,122 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:31:13,130 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 15:31:13,130 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 15:31:13,163 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 15:31:13,231 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:31:13,580 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4515#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:31:13,580 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:31:13,580 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:31:13,580 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 22 [2022-12-14 15:31:13,581 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1957966685] [2022-12-14 15:31:13,581 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:31:13,581 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-12-14 15:31:13,581 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:31:13,581 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-12-14 15:31:13,582 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=554, Unknown=0, NotChecked=0, Total=702 [2022-12-14 15:31:13,582 INFO L87 Difference]: Start difference. First operand 49 states and 56 transitions. Second operand has 22 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 22 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:13,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:31:13,745 INFO L93 Difference]: Finished difference Result 104 states and 119 transitions. [2022-12-14 15:31:13,746 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-12-14 15:31:13,746 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 22 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2022-12-14 15:31:13,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:31:13,746 INFO L225 Difference]: With dead ends: 104 [2022-12-14 15:31:13,746 INFO L226 Difference]: Without dead ends: 58 [2022-12-14 15:31:13,747 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 63 SyntacticMatches, 29 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 772 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=223, Invalid=833, Unknown=0, NotChecked=0, Total=1056 [2022-12-14 15:31:13,748 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 29 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 216 mSolverCounterSat, 138 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 354 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 138 IncrementalHoareTripleChecker+Valid, 216 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:31:13,748 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 13 Invalid, 354 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [138 Valid, 216 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:31:13,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2022-12-14 15:31:13,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 51. [2022-12-14 15:31:13,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 50 states have (on average 1.14) internal successors, (57), 50 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:13,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 57 transitions. [2022-12-14 15:31:13,764 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 57 transitions. Word has length 35 [2022-12-14 15:31:13,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:31:13,764 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 57 transitions. [2022-12-14 15:31:13,764 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 22 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:13,764 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 57 transitions. [2022-12-14 15:31:13,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-12-14 15:31:13,765 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:31:13,765 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:31:13,770 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-12-14 15:31:13,965 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-12-14 15:31:13,966 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:31:13,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:31:13,967 INFO L85 PathProgramCache]: Analyzing trace with hash 1601737700, now seen corresponding path program 14 times [2022-12-14 15:31:13,968 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:31:13,968 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [152197730] [2022-12-14 15:31:13,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:31:13,968 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:31:14,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:31:14,101 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2022-12-14 15:31:14,101 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:31:14,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [152197730] [2022-12-14 15:31:14,101 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [152197730] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:31:14,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [383019670] [2022-12-14 15:31:14,101 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:31:14,101 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:31:14,102 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:31:14,102 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:31:14,103 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-12-14 15:31:14,164 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-12-14 15:31:14,164 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:31:14,165 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 14 conjunts are in the unsatisfiable core [2022-12-14 15:31:14,166 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:31:14,245 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2022-12-14 15:31:14,245 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:31:14,316 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2022-12-14 15:31:14,316 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [383019670] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:31:14,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [403908453] [2022-12-14 15:31:14,317 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 15:31:14,317 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:31:14,317 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:31:14,318 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:31:14,318 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:31:14,362 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 15:31:14,362 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 15:31:14,370 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 15:31:14,382 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 15:31:14,415 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:31:14,415 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 15:31:14,431 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 15:31:14,431 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 245 treesize of output 248 [2022-12-14 15:31:14,470 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 15:31:14,534 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:31:14,863 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5056#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:31:14,863 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:31:14,863 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:31:14,863 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2022-12-14 15:31:14,864 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [989782545] [2022-12-14 15:31:14,864 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:31:14,864 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-12-14 15:31:14,864 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:31:14,864 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-12-14 15:31:14,864 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=605, Unknown=0, NotChecked=0, Total=756 [2022-12-14 15:31:14,865 INFO L87 Difference]: Start difference. First operand 51 states and 57 transitions. Second operand has 23 states, 23 states have (on average 1.4782608695652173) internal successors, (34), 23 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:15,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:31:15,031 INFO L93 Difference]: Finished difference Result 55 states and 61 transitions. [2022-12-14 15:31:15,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-12-14 15:31:15,032 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.4782608695652173) internal successors, (34), 23 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2022-12-14 15:31:15,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:31:15,032 INFO L225 Difference]: With dead ends: 55 [2022-12-14 15:31:15,032 INFO L226 Difference]: Without dead ends: 40 [2022-12-14 15:31:15,033 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 65 SyntacticMatches, 30 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 996 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=243, Invalid=1017, Unknown=0, NotChecked=0, Total=1260 [2022-12-14 15:31:15,033 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 28 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 243 mSolverCounterSat, 111 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 354 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 111 IncrementalHoareTripleChecker+Valid, 243 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:31:15,033 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 17 Invalid, 354 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [111 Valid, 243 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:31:15,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-12-14 15:31:15,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2022-12-14 15:31:15,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.1282051282051282) internal successors, (44), 39 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:15,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 44 transitions. [2022-12-14 15:31:15,045 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 44 transitions. Word has length 36 [2022-12-14 15:31:15,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:31:15,045 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 44 transitions. [2022-12-14 15:31:15,046 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.4782608695652173) internal successors, (34), 23 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:15,046 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 44 transitions. [2022-12-14 15:31:15,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-12-14 15:31:15,046 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:31:15,046 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:31:15,050 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2022-12-14 15:31:15,247 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-12-14 15:31:15,248 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:31:15,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:31:15,249 INFO L85 PathProgramCache]: Analyzing trace with hash 522181129, now seen corresponding path program 15 times [2022-12-14 15:31:15,249 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:31:15,249 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1962976152] [2022-12-14 15:31:15,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:31:15,250 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:31:15,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:31:18,529 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 3 proven. 102 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:31:18,529 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:31:18,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1962976152] [2022-12-14 15:31:18,529 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1962976152] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:31:18,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1871681662] [2022-12-14 15:31:18,529 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:31:18,529 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:31:18,529 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:31:18,530 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:31:18,531 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-12-14 15:31:18,589 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:31:18,589 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:31:18,591 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 112 conjunts are in the unsatisfiable core [2022-12-14 15:31:18,593 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:31:19,712 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 6 proven. 84 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-12-14 15:31:19,712 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:31:21,677 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 15:31:21,678 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 104 treesize of output 408 [2022-12-14 15:31:24,810 INFO L321 Elim1Store]: treesize reduction 366, result has 6.4 percent of original size [2022-12-14 15:31:24,810 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 103 treesize of output 41 [2022-12-14 15:31:24,986 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-12-14 15:31:24,986 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1871681662] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:31:24,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1117266336] [2022-12-14 15:31:24,987 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 15:31:24,987 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:31:24,987 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:31:24,987 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:31:24,987 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:31:25,019 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 15:31:25,020 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 15:31:25,026 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 15:31:25,038 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 15:31:25,071 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:31:25,072 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 15:31:25,085 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 15:31:25,085 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 245 treesize of output 248 [2022-12-14 15:31:25,136 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 15:31:25,193 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:31:26,925 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5557#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:31:26,925 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:31:26,925 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:31:26,925 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 20, 25] total 75 [2022-12-14 15:31:26,925 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [846600552] [2022-12-14 15:31:26,925 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:31:26,925 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 75 states [2022-12-14 15:31:26,925 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:31:26,926 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2022-12-14 15:31:26,927 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=363, Invalid=5957, Unknown=0, NotChecked=0, Total=6320 [2022-12-14 15:31:26,927 INFO L87 Difference]: Start difference. First operand 40 states and 44 transitions. Second operand has 75 states, 75 states have (on average 1.3733333333333333) internal successors, (103), 75 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:32,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:31:32,506 INFO L93 Difference]: Finished difference Result 71 states and 80 transitions. [2022-12-14 15:31:32,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-12-14 15:31:32,506 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 75 states have (on average 1.3733333333333333) internal successors, (103), 75 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2022-12-14 15:31:32,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:31:32,506 INFO L225 Difference]: With dead ends: 71 [2022-12-14 15:31:32,506 INFO L226 Difference]: Without dead ends: 68 [2022-12-14 15:31:32,508 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 48 SyntacticMatches, 27 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4000 ImplicationChecksByTransitivity, 10.1s TimeCoverageRelationStatistics Valid=866, Invalid=11344, Unknown=0, NotChecked=0, Total=12210 [2022-12-14 15:31:32,508 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 20 mSDsluCounter, 128 mSDsCounter, 0 mSdLazyCounter, 1688 mSolverCounterSat, 131 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 1819 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 131 IncrementalHoareTripleChecker+Valid, 1688 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:31:32,509 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 133 Invalid, 1819 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [131 Valid, 1688 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-12-14 15:31:32,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2022-12-14 15:31:32,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 56. [2022-12-14 15:31:32,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 1.1454545454545455) internal successors, (63), 55 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:32,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 63 transitions. [2022-12-14 15:31:32,531 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 63 transitions. Word has length 39 [2022-12-14 15:31:32,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:31:32,531 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 63 transitions. [2022-12-14 15:31:32,531 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 75 states, 75 states have (on average 1.3733333333333333) internal successors, (103), 75 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:32,531 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 63 transitions. [2022-12-14 15:31:32,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-12-14 15:31:32,532 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:31:32,532 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:31:32,536 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2022-12-14 15:31:32,732 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-12-14 15:31:32,733 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:31:32,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:31:32,734 INFO L85 PathProgramCache]: Analyzing trace with hash -1271123139, now seen corresponding path program 16 times [2022-12-14 15:31:32,734 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:31:32,734 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [966308440] [2022-12-14 15:31:32,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:31:32,735 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:31:32,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:31:32,879 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 22 proven. 27 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2022-12-14 15:31:32,879 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:31:32,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [966308440] [2022-12-14 15:31:32,880 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [966308440] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:31:32,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [447208683] [2022-12-14 15:31:32,880 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:31:32,880 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:31:32,880 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:31:32,881 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:31:32,881 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-12-14 15:31:32,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:31:32,934 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 16 conjunts are in the unsatisfiable core [2022-12-14 15:31:32,934 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:31:33,023 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2022-12-14 15:31:33,023 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:31:33,081 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2022-12-14 15:31:33,081 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [447208683] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:31:33,081 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2145216926] [2022-12-14 15:31:33,082 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 15:31:33,082 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:31:33,082 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:31:33,082 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:31:33,082 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:31:33,113 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 15:31:33,113 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 15:31:33,121 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 15:31:33,133 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 15:31:33,167 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:31:33,169 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:31:33,176 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 15:31:33,177 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 15:31:33,217 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 15:31:33,294 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:31:33,707 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6121#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:31:33,707 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:31:33,707 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:31:33,708 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 25 [2022-12-14 15:31:33,708 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [138975438] [2022-12-14 15:31:33,708 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:31:33,708 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-12-14 15:31:33,708 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:31:33,709 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-12-14 15:31:33,709 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=687, Unknown=0, NotChecked=0, Total=870 [2022-12-14 15:31:33,709 INFO L87 Difference]: Start difference. First operand 56 states and 63 transitions. Second operand has 25 states, 25 states have (on average 1.48) internal successors, (37), 25 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:33,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:31:33,936 INFO L93 Difference]: Finished difference Result 118 states and 133 transitions. [2022-12-14 15:31:33,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-12-14 15:31:33,937 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.48) internal successors, (37), 25 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2022-12-14 15:31:33,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:31:33,937 INFO L225 Difference]: With dead ends: 118 [2022-12-14 15:31:33,937 INFO L226 Difference]: Without dead ends: 65 [2022-12-14 15:31:33,938 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 72 SyntacticMatches, 34 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1010 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=281, Invalid=1051, Unknown=0, NotChecked=0, Total=1332 [2022-12-14 15:31:33,938 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 36 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 199 mSolverCounterSat, 198 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 397 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 198 IncrementalHoareTripleChecker+Valid, 199 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:31:33,938 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 13 Invalid, 397 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [198 Valid, 199 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:31:33,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-12-14 15:31:33,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 58. [2022-12-14 15:31:33,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 57 states have (on average 1.1228070175438596) internal successors, (64), 57 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:33,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 64 transitions. [2022-12-14 15:31:33,961 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 64 transitions. Word has length 40 [2022-12-14 15:31:33,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:31:33,961 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 64 transitions. [2022-12-14 15:31:33,961 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.48) internal successors, (37), 25 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:33,961 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 64 transitions. [2022-12-14 15:31:33,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-12-14 15:31:33,961 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:31:33,962 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:31:33,966 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2022-12-14 15:31:34,162 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-12-14 15:31:34,163 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:31:34,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:31:34,164 INFO L85 PathProgramCache]: Analyzing trace with hash -1404540108, now seen corresponding path program 17 times [2022-12-14 15:31:34,164 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:31:34,164 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1667451292] [2022-12-14 15:31:34,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:31:34,165 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:31:34,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:31:34,322 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 15 proven. 34 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2022-12-14 15:31:34,322 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:31:34,322 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1667451292] [2022-12-14 15:31:34,322 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1667451292] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:31:34,322 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [627775260] [2022-12-14 15:31:34,323 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:31:34,323 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:31:34,323 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:31:34,323 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:31:34,324 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-12-14 15:31:34,401 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-12-14 15:31:34,401 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:31:34,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 16 conjunts are in the unsatisfiable core [2022-12-14 15:31:34,403 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:31:34,514 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2022-12-14 15:31:34,515 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:31:34,620 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2022-12-14 15:31:34,620 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [627775260] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:31:34,620 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [214446042] [2022-12-14 15:31:34,622 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 15:31:34,622 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:31:34,622 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:31:34,622 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:31:34,622 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:31:34,663 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 15:31:34,663 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-12-14 15:31:34,689 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 15:31:34,690 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 15:31:34,702 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 15:31:34,739 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:31:34,741 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:31:34,749 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 15:31:34,750 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 15:31:34,786 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 15:31:34,850 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:31:34,969 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6739#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:31:34,969 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:31:34,970 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:31:34,970 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2022-12-14 15:31:34,970 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [228217915] [2022-12-14 15:31:34,970 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:31:34,970 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-12-14 15:31:34,970 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:31:34,971 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-12-14 15:31:34,971 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=745, Unknown=0, NotChecked=0, Total=930 [2022-12-14 15:31:34,971 INFO L87 Difference]: Start difference. First operand 58 states and 64 transitions. Second operand has 26 states, 26 states have (on average 1.8076923076923077) internal successors, (47), 26 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:35,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:31:35,180 INFO L93 Difference]: Finished difference Result 62 states and 68 transitions. [2022-12-14 15:31:35,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-12-14 15:31:35,181 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.8076923076923077) internal successors, (47), 26 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2022-12-14 15:31:35,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:31:35,181 INFO L225 Difference]: With dead ends: 62 [2022-12-14 15:31:35,181 INFO L226 Difference]: Without dead ends: 45 [2022-12-14 15:31:35,182 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 95 SyntacticMatches, 14 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 680 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=301, Invalid=1259, Unknown=0, NotChecked=0, Total=1560 [2022-12-14 15:31:35,182 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 237 mSolverCounterSat, 127 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 364 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 127 IncrementalHoareTripleChecker+Valid, 237 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:31:35,182 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 9 Invalid, 364 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [127 Valid, 237 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:31:35,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-12-14 15:31:35,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2022-12-14 15:31:35,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.1136363636363635) internal successors, (49), 44 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:35,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2022-12-14 15:31:35,201 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 41 [2022-12-14 15:31:35,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:31:35,201 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2022-12-14 15:31:35,202 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.8076923076923077) internal successors, (47), 26 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:35,202 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2022-12-14 15:31:35,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-12-14 15:31:35,202 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:31:35,202 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:31:35,206 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2022-12-14 15:31:35,403 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:31:35,404 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:31:35,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:31:35,405 INFO L85 PathProgramCache]: Analyzing trace with hash -1836404231, now seen corresponding path program 18 times [2022-12-14 15:31:35,405 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:31:35,405 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1381228747] [2022-12-14 15:31:35,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:31:35,406 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:31:35,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:31:39,380 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 10 proven. 130 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:31:39,380 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:31:39,381 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1381228747] [2022-12-14 15:31:39,381 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1381228747] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:31:39,381 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [490450665] [2022-12-14 15:31:39,381 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:31:39,381 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:31:39,381 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:31:39,382 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:31:39,382 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-12-14 15:31:39,472 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:31:39,472 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:31:39,475 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 122 conjunts are in the unsatisfiable core [2022-12-14 15:31:39,478 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:31:40,786 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 0 proven. 112 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-12-14 15:31:40,787 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:31:42,518 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 15:31:42,518 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 14 select indices, 14 select index equivalence classes, 0 disjoint index pairs (out of 91 index pairs), introduced 14 new quantified variables, introduced 91 case distinctions, treesize of input 121 treesize of output 552 [2022-12-14 15:31:48,569 INFO L321 Elim1Store]: treesize reduction 504, result has 5.4 percent of original size [2022-12-14 15:31:48,569 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 14 select indices, 14 select index equivalence classes, 0 disjoint index pairs (out of 91 index pairs), introduced 14 new quantified variables, introduced 91 case distinctions, treesize of input 120 treesize of output 47 [2022-12-14 15:31:48,639 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 0 proven. 112 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-12-14 15:31:48,639 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [490450665] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:31:48,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [361507778] [2022-12-14 15:31:48,640 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 15:31:48,640 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:31:48,640 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:31:48,640 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:31:48,640 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:31:48,671 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 15:31:48,672 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-12-14 15:31:48,699 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 15:31:48,699 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 15:31:48,713 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 15:31:48,745 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:31:48,746 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:31:48,753 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 15:31:48,753 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 15:31:48,782 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 15:31:48,842 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:31:49,227 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7296#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:31:49,227 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:31:49,227 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:31:49,227 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 20, 20] total 75 [2022-12-14 15:31:49,227 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [972248070] [2022-12-14 15:31:49,227 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:31:49,228 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 75 states [2022-12-14 15:31:49,228 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:31:49,228 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2022-12-14 15:31:49,229 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=320, Invalid=6000, Unknown=0, NotChecked=0, Total=6320 [2022-12-14 15:31:49,229 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand has 75 states, 75 states have (on average 1.52) internal successors, (114), 75 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:53,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:31:53,608 INFO L93 Difference]: Finished difference Result 79 states and 88 transitions. [2022-12-14 15:31:53,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-12-14 15:31:53,609 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 75 states have (on average 1.52) internal successors, (114), 75 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2022-12-14 15:31:53,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:31:53,609 INFO L225 Difference]: With dead ends: 79 [2022-12-14 15:31:53,609 INFO L226 Difference]: Without dead ends: 76 [2022-12-14 15:31:53,610 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 88 SyntacticMatches, 7 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3325 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=700, Invalid=11732, Unknown=0, NotChecked=0, Total=12432 [2022-12-14 15:31:53,610 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 9 mSDsluCounter, 138 mSDsCounter, 0 mSdLazyCounter, 1669 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 1727 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 1669 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:31:53,610 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 143 Invalid, 1727 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 1669 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-12-14 15:31:53,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2022-12-14 15:31:53,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 63. [2022-12-14 15:31:53,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 62 states have (on average 1.1290322580645162) internal successors, (70), 62 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:53,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 70 transitions. [2022-12-14 15:31:53,635 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 70 transitions. Word has length 44 [2022-12-14 15:31:53,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:31:53,635 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 70 transitions. [2022-12-14 15:31:53,636 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 75 states, 75 states have (on average 1.52) internal successors, (114), 75 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:53,636 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 70 transitions. [2022-12-14 15:31:53,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-12-14 15:31:53,636 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:31:53,636 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:31:53,640 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2022-12-14 15:31:53,837 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:31:53,838 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:31:53,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:31:53,839 INFO L85 PathProgramCache]: Analyzing trace with hash -1283717893, now seen corresponding path program 19 times [2022-12-14 15:31:53,839 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:31:53,839 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1070787126] [2022-12-14 15:31:53,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:31:53,840 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:31:53,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:31:54,007 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 29 proven. 35 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2022-12-14 15:31:54,007 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:31:54,007 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1070787126] [2022-12-14 15:31:54,007 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1070787126] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:31:54,007 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [962520359] [2022-12-14 15:31:54,007 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:31:54,008 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:31:54,008 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:31:54,008 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:31:54,009 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-12-14 15:31:54,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:31:54,068 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 18 conjunts are in the unsatisfiable core [2022-12-14 15:31:54,069 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:31:54,174 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2022-12-14 15:31:54,174 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:31:54,245 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2022-12-14 15:31:54,245 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [962520359] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:31:54,245 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1428738917] [2022-12-14 15:31:54,246 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 15:31:54,246 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:31:54,246 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:31:54,246 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:31:54,246 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:31:54,283 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 15:31:54,283 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-12-14 15:31:54,317 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 15:31:54,317 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 15:31:54,336 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 15:31:54,369 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:31:54,370 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 15:31:54,385 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 15:31:54,385 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 245 treesize of output 248 [2022-12-14 15:31:54,437 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 15:31:54,494 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:31:54,651 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7925#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:31:54,651 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:31:54,651 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:31:54,651 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 28 [2022-12-14 15:31:54,652 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1144051908] [2022-12-14 15:31:54,652 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:31:54,652 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-12-14 15:31:54,652 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:31:54,652 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-12-14 15:31:54,652 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=834, Unknown=0, NotChecked=0, Total=1056 [2022-12-14 15:31:54,652 INFO L87 Difference]: Start difference. First operand 63 states and 70 transitions. Second operand has 28 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 28 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:54,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:31:54,908 INFO L93 Difference]: Finished difference Result 132 states and 147 transitions. [2022-12-14 15:31:54,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-12-14 15:31:54,908 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 28 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 45 [2022-12-14 15:31:54,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:31:54,909 INFO L225 Difference]: With dead ends: 132 [2022-12-14 15:31:54,909 INFO L226 Difference]: Without dead ends: 72 [2022-12-14 15:31:54,909 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 105 SyntacticMatches, 15 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 655 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=346, Invalid=1294, Unknown=0, NotChecked=0, Total=1640 [2022-12-14 15:31:54,910 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 38 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 216 mSolverCounterSat, 198 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 414 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 198 IncrementalHoareTripleChecker+Valid, 216 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:31:54,910 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 15 Invalid, 414 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [198 Valid, 216 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:31:54,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2022-12-14 15:31:54,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 65. [2022-12-14 15:31:54,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.109375) internal successors, (71), 64 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:54,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 71 transitions. [2022-12-14 15:31:54,937 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 71 transitions. Word has length 45 [2022-12-14 15:31:54,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:31:54,938 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 71 transitions. [2022-12-14 15:31:54,938 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 28 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:54,938 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 71 transitions. [2022-12-14 15:31:54,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-12-14 15:31:54,938 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:31:54,938 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:31:54,942 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-12-14 15:31:55,139 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:31:55,139 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:31:55,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:31:55,140 INFO L85 PathProgramCache]: Analyzing trace with hash 1660366692, now seen corresponding path program 20 times [2022-12-14 15:31:55,140 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:31:55,141 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1748102407] [2022-12-14 15:31:55,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:31:55,141 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:31:55,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:31:55,324 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 21 proven. 43 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2022-12-14 15:31:55,324 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:31:55,324 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1748102407] [2022-12-14 15:31:55,324 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1748102407] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:31:55,324 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1501601003] [2022-12-14 15:31:55,325 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:31:55,325 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:31:55,325 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:31:55,325 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:31:55,326 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-12-14 15:31:55,424 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-12-14 15:31:55,424 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:31:55,425 INFO L263 TraceCheckSpWp]: Trace formula consists of 268 conjuncts, 18 conjunts are in the unsatisfiable core [2022-12-14 15:31:55,426 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:31:55,530 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2022-12-14 15:31:55,530 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:31:55,629 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2022-12-14 15:31:55,629 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1501601003] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:31:55,629 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1404039955] [2022-12-14 15:31:55,631 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 15:31:55,631 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:31:55,631 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:31:55,631 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:31:55,631 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:31:55,664 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 15:31:55,665 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-12-14 15:31:55,699 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 15:31:55,699 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 15:31:55,714 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 15:31:55,750 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:31:55,751 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 15:31:55,767 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 15:31:55,767 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 245 treesize of output 248 [2022-12-14 15:31:55,832 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 15:31:55,899 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:31:56,404 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8620#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:31:56,404 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:31:56,404 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:31:56,404 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2022-12-14 15:31:56,404 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1192719662] [2022-12-14 15:31:56,404 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:31:56,405 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-12-14 15:31:56,405 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:31:56,405 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-12-14 15:31:56,405 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=223, Invalid=899, Unknown=0, NotChecked=0, Total=1122 [2022-12-14 15:31:56,405 INFO L87 Difference]: Start difference. First operand 65 states and 71 transitions. Second operand has 29 states, 29 states have (on average 1.3793103448275863) internal successors, (40), 29 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:56,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:31:56,654 INFO L93 Difference]: Finished difference Result 69 states and 75 transitions. [2022-12-14 15:31:56,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-12-14 15:31:56,655 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.3793103448275863) internal successors, (40), 29 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2022-12-14 15:31:56,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:31:56,655 INFO L225 Difference]: With dead ends: 69 [2022-12-14 15:31:56,655 INFO L226 Difference]: Without dead ends: 50 [2022-12-14 15:31:56,655 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 83 SyntacticMatches, 40 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1666 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=366, Invalid=1526, Unknown=0, NotChecked=0, Total=1892 [2022-12-14 15:31:56,656 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 34 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 338 mSolverCounterSat, 156 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 494 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 156 IncrementalHoareTripleChecker+Valid, 338 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:31:56,656 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 17 Invalid, 494 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [156 Valid, 338 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:31:56,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-12-14 15:31:56,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2022-12-14 15:31:56,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.1020408163265305) internal successors, (54), 49 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:56,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2022-12-14 15:31:56,675 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 46 [2022-12-14 15:31:56,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:31:56,675 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2022-12-14 15:31:56,676 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.3793103448275863) internal successors, (40), 29 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:31:56,676 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2022-12-14 15:31:56,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-12-14 15:31:56,676 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:31:56,676 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:31:56,681 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-12-14 15:31:56,876 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:31:56,877 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:31:56,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:31:56,878 INFO L85 PathProgramCache]: Analyzing trace with hash -274592887, now seen corresponding path program 21 times [2022-12-14 15:31:56,878 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:31:56,878 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [505008330] [2022-12-14 15:31:56,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:31:56,879 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:31:56,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:32:02,737 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 0 proven. 180 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:32:02,738 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:32:02,738 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [505008330] [2022-12-14 15:32:02,738 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [505008330] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:32:02,738 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1986033073] [2022-12-14 15:32:02,738 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:32:02,738 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:32:02,738 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:32:02,739 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:32:02,740 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-12-14 15:32:02,820 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:32:02,820 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:32:02,823 WARN L261 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 147 conjunts are in the unsatisfiable core [2022-12-14 15:32:02,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:32:02,901 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-12-14 15:32:02,906 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-12-14 15:32:04,987 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-12-14 15:32:04,987 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:32:09,255 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 0 proven. 152 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-12-14 15:32:09,256 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1986033073] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:32:09,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [363091436] [2022-12-14 15:32:09,257 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 15:32:09,257 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:32:09,257 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:32:09,257 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:32:09,257 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:32:09,301 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 15:32:09,302 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 15:32:09,310 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 15:32:09,327 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 15:32:09,361 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:32:09,363 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:32:09,373 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 15:32:09,373 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 15:32:09,409 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 15:32:09,472 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:32:12,468 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9250#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:32:12,468 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:32:12,468 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:32:12,468 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 22, 30] total 92 [2022-12-14 15:32:12,468 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [627342346] [2022-12-14 15:32:12,468 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:32:12,469 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 92 states [2022-12-14 15:32:12,469 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:32:12,469 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2022-12-14 15:32:12,470 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=419, Invalid=8893, Unknown=0, NotChecked=0, Total=9312 [2022-12-14 15:32:12,470 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand has 92 states, 92 states have (on average 1.391304347826087) internal successors, (128), 92 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:32:19,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:32:19,743 INFO L93 Difference]: Finished difference Result 87 states and 96 transitions. [2022-12-14 15:32:19,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2022-12-14 15:32:19,743 INFO L78 Accepts]: Start accepts. Automaton has has 92 states, 92 states have (on average 1.391304347826087) internal successors, (128), 92 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2022-12-14 15:32:19,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:32:19,743 INFO L225 Difference]: With dead ends: 87 [2022-12-14 15:32:19,744 INFO L226 Difference]: Without dead ends: 84 [2022-12-14 15:32:19,744 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 61 SyntacticMatches, 37 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5207 ImplicationChecksByTransitivity, 16.8s TimeCoverageRelationStatistics Valid=802, Invalid=15710, Unknown=0, NotChecked=0, Total=16512 [2022-12-14 15:32:19,745 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 21 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 2538 mSolverCounterSat, 78 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 174 SdHoareTripleChecker+Invalid, 2616 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 78 IncrementalHoareTripleChecker+Valid, 2538 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-12-14 15:32:19,745 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 174 Invalid, 2616 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [78 Valid, 2538 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-12-14 15:32:19,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2022-12-14 15:32:19,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 70. [2022-12-14 15:32:19,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.1159420289855073) internal successors, (77), 69 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:32:19,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 77 transitions. [2022-12-14 15:32:19,776 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 77 transitions. Word has length 49 [2022-12-14 15:32:19,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:32:19,776 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 77 transitions. [2022-12-14 15:32:19,776 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 92 states, 92 states have (on average 1.391304347826087) internal successors, (128), 92 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:32:19,776 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 77 transitions. [2022-12-14 15:32:19,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-12-14 15:32:19,777 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:32:19,777 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:32:19,781 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2022-12-14 15:32:19,977 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2022-12-14 15:32:19,978 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:32:19,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:32:19,979 INFO L85 PathProgramCache]: Analyzing trace with hash -1551922563, now seen corresponding path program 22 times [2022-12-14 15:32:19,979 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:32:19,980 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1018666129] [2022-12-14 15:32:19,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:32:19,980 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:32:20,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:32:20,185 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 37 proven. 44 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2022-12-14 15:32:20,185 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:32:20,185 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1018666129] [2022-12-14 15:32:20,185 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1018666129] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:32:20,185 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [370654653] [2022-12-14 15:32:20,185 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:32:20,185 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:32:20,185 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:32:20,186 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:32:20,187 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-12-14 15:32:20,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:32:20,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 20 conjunts are in the unsatisfiable core [2022-12-14 15:32:20,252 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:32:20,388 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2022-12-14 15:32:20,388 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:32:20,483 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2022-12-14 15:32:20,483 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [370654653] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:32:20,483 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [425923628] [2022-12-14 15:32:20,484 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 15:32:20,484 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:32:20,484 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:32:20,484 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:32:20,484 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:32:20,518 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 15:32:20,519 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-12-14 15:32:20,553 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 15:32:20,553 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 15:32:20,569 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 15:32:20,601 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:32:20,603 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:32:20,610 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 15:32:20,611 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 15:32:20,644 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 15:32:20,714 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:32:21,360 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9942#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:32:21,360 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:32:21,360 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:32:21,360 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 31 [2022-12-14 15:32:21,360 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [718432862] [2022-12-14 15:32:21,361 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:32:21,361 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-12-14 15:32:21,361 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:32:21,361 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-12-14 15:32:21,362 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=265, Invalid=995, Unknown=0, NotChecked=0, Total=1260 [2022-12-14 15:32:21,362 INFO L87 Difference]: Start difference. First operand 70 states and 77 transitions. Second operand has 31 states, 31 states have (on average 1.3870967741935485) internal successors, (43), 31 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:32:21,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:32:21,698 INFO L93 Difference]: Finished difference Result 146 states and 161 transitions. [2022-12-14 15:32:21,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-12-14 15:32:21,698 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.3870967741935485) internal successors, (43), 31 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2022-12-14 15:32:21,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:32:21,699 INFO L225 Difference]: With dead ends: 146 [2022-12-14 15:32:21,699 INFO L226 Difference]: Without dead ends: 79 [2022-12-14 15:32:21,699 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 90 SyntacticMatches, 44 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1579 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=418, Invalid=1562, Unknown=0, NotChecked=0, Total=1980 [2022-12-14 15:32:21,700 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 46 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 254 mSolverCounterSat, 315 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 569 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 315 IncrementalHoareTripleChecker+Valid, 254 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 15:32:21,700 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [46 Valid, 17 Invalid, 569 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [315 Valid, 254 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 15:32:21,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2022-12-14 15:32:21,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 72. [2022-12-14 15:32:21,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 71 states have (on average 1.0985915492957747) internal successors, (78), 71 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:32:21,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 78 transitions. [2022-12-14 15:32:21,734 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 78 transitions. Word has length 50 [2022-12-14 15:32:21,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:32:21,734 INFO L495 AbstractCegarLoop]: Abstraction has 72 states and 78 transitions. [2022-12-14 15:32:21,735 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.3870967741935485) internal successors, (43), 31 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:32:21,735 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 78 transitions. [2022-12-14 15:32:21,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-12-14 15:32:21,735 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:32:21,735 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:32:21,739 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2022-12-14 15:32:21,935 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-12-14 15:32:21,936 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:32:21,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:32:21,937 INFO L85 PathProgramCache]: Analyzing trace with hash -946112076, now seen corresponding path program 23 times [2022-12-14 15:32:21,937 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:32:21,937 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1527497268] [2022-12-14 15:32:21,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:32:21,938 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:32:21,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:32:22,132 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 28 proven. 53 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2022-12-14 15:32:22,132 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:32:22,133 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1527497268] [2022-12-14 15:32:22,133 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1527497268] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:32:22,133 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [599061743] [2022-12-14 15:32:22,133 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:32:22,133 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:32:22,133 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:32:22,134 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:32:22,134 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-12-14 15:32:22,263 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-12-14 15:32:22,263 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:32:22,265 INFO L263 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 20 conjunts are in the unsatisfiable core [2022-12-14 15:32:22,266 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:32:22,382 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2022-12-14 15:32:22,383 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:32:22,491 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2022-12-14 15:32:22,491 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [599061743] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:32:22,492 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1638242128] [2022-12-14 15:32:22,492 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 15:32:22,492 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:32:22,493 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:32:22,493 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:32:22,493 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:32:22,529 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 15:32:22,530 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 15:32:22,536 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 15:32:22,549 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 15:32:22,581 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:32:22,583 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:32:22,590 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 15:32:22,591 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 15:32:22,619 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 15:32:22,691 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:32:23,165 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10714#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:32:23,165 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:32:23,165 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:32:23,165 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 32 [2022-12-14 15:32:23,166 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1776125984] [2022-12-14 15:32:23,166 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:32:23,166 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-12-14 15:32:23,166 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:32:23,167 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-12-14 15:32:23,167 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=265, Invalid=1067, Unknown=0, NotChecked=0, Total=1332 [2022-12-14 15:32:23,167 INFO L87 Difference]: Start difference. First operand 72 states and 78 transitions. Second operand has 32 states, 32 states have (on average 1.96875) internal successors, (63), 32 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:32:23,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:32:23,402 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2022-12-14 15:32:23,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-12-14 15:32:23,402 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.96875) internal successors, (63), 32 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2022-12-14 15:32:23,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:32:23,403 INFO L225 Difference]: With dead ends: 76 [2022-12-14 15:32:23,403 INFO L226 Difference]: Without dead ends: 55 [2022-12-14 15:32:23,403 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 93 SyntacticMatches, 45 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2064 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=438, Invalid=1818, Unknown=0, NotChecked=0, Total=2256 [2022-12-14 15:32:23,403 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 23 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 362 mSolverCounterSat, 140 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 502 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 140 IncrementalHoareTripleChecker+Valid, 362 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:32:23,404 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 13 Invalid, 502 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [140 Valid, 362 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:32:23,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-12-14 15:32:23,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2022-12-14 15:32:23,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.0925925925925926) internal successors, (59), 54 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:32:23,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 59 transitions. [2022-12-14 15:32:23,428 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 59 transitions. Word has length 51 [2022-12-14 15:32:23,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:32:23,428 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 59 transitions. [2022-12-14 15:32:23,429 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.96875) internal successors, (63), 32 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:32:23,429 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 59 transitions. [2022-12-14 15:32:23,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-12-14 15:32:23,429 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:32:23,429 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:32:23,434 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2022-12-14 15:32:23,630 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:32:23,631 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:32:23,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:32:23,631 INFO L85 PathProgramCache]: Analyzing trace with hash -983457671, now seen corresponding path program 24 times [2022-12-14 15:32:23,632 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:32:23,632 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [284415782] [2022-12-14 15:32:23,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:32:23,632 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:32:23,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:32:31,140 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 9 proven. 216 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:32:31,141 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:32:31,141 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [284415782] [2022-12-14 15:32:31,141 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [284415782] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:32:31,141 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [912822998] [2022-12-14 15:32:31,141 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:32:31,141 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:32:31,141 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:32:31,142 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:32:31,143 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-12-14 15:32:31,233 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:32:31,233 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:32:31,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 310 conjuncts, 154 conjunts are in the unsatisfiable core [2022-12-14 15:32:31,238 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:32:33,590 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 180 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-12-14 15:32:33,591 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:32:36,558 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 15:32:36,559 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 18 select indices, 18 select index equivalence classes, 0 disjoint index pairs (out of 153 index pairs), introduced 18 new quantified variables, introduced 153 case distinctions, treesize of input 155 treesize of output 906 [2022-12-14 15:32:49,284 INFO L321 Elim1Store]: treesize reduction 846, result has 4.2 percent of original size [2022-12-14 15:32:49,285 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 18 select indices, 18 select index equivalence classes, 0 disjoint index pairs (out of 153 index pairs), introduced 18 new quantified variables, introduced 153 case distinctions, treesize of input 154 treesize of output 59 [2022-12-14 15:32:49,395 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 180 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-12-14 15:32:49,395 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [912822998] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:32:49,395 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [191079182] [2022-12-14 15:32:49,396 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 15:32:49,396 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:32:49,396 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:32:49,396 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:32:49,396 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:32:49,438 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 15:32:49,438 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 15:32:49,446 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 15:32:49,463 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 15:32:49,499 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:32:49,502 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:32:49,512 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 15:32:49,512 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 15:32:49,551 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 15:32:49,613 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:32:50,117 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11402#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:32:50,118 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:32:50,118 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:32:50,118 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 24, 24] total 93 [2022-12-14 15:32:50,118 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2056098581] [2022-12-14 15:32:50,118 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:32:50,119 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 93 states [2022-12-14 15:32:50,119 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:32:50,120 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2022-12-14 15:32:50,120 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=485, Invalid=9021, Unknown=0, NotChecked=0, Total=9506 [2022-12-14 15:32:50,120 INFO L87 Difference]: Start difference. First operand 55 states and 59 transitions. Second operand has 93 states, 93 states have (on average 1.5053763440860215) internal successors, (140), 93 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:33:00,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:33:00,321 INFO L93 Difference]: Finished difference Result 95 states and 104 transitions. [2022-12-14 15:33:00,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2022-12-14 15:33:00,322 INFO L78 Accepts]: Start accepts. Automaton has has 93 states, 93 states have (on average 1.5053763440860215) internal successors, (140), 93 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 54 [2022-12-14 15:33:00,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:33:00,323 INFO L225 Difference]: With dead ends: 95 [2022-12-14 15:33:00,323 INFO L226 Difference]: Without dead ends: 92 [2022-12-14 15:33:00,324 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 264 GetRequests, 108 SyntacticMatches, 9 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6511 ImplicationChecksByTransitivity, 15.4s TimeCoverageRelationStatistics Valid=1360, Invalid=20692, Unknown=0, NotChecked=0, Total=22052 [2022-12-14 15:33:00,324 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 20 mSDsluCounter, 170 mSDsCounter, 0 mSdLazyCounter, 2394 mSolverCounterSat, 117 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 175 SdHoareTripleChecker+Invalid, 2511 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 117 IncrementalHoareTripleChecker+Valid, 2394 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:33:00,324 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 175 Invalid, 2511 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [117 Valid, 2394 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2022-12-14 15:33:00,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2022-12-14 15:33:00,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 77. [2022-12-14 15:33:00,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 76 states have (on average 1.105263157894737) internal successors, (84), 76 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:33:00,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 84 transitions. [2022-12-14 15:33:00,366 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 84 transitions. Word has length 54 [2022-12-14 15:33:00,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:33:00,366 INFO L495 AbstractCegarLoop]: Abstraction has 77 states and 84 transitions. [2022-12-14 15:33:00,366 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 93 states, 93 states have (on average 1.5053763440860215) internal successors, (140), 93 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:33:00,366 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 84 transitions. [2022-12-14 15:33:00,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-12-14 15:33:00,366 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:33:00,366 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:33:00,371 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2022-12-14 15:33:00,567 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-12-14 15:33:00,567 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:33:00,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:33:00,568 INFO L85 PathProgramCache]: Analyzing trace with hash -91271237, now seen corresponding path program 25 times [2022-12-14 15:33:00,568 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:33:00,568 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [487822452] [2022-12-14 15:33:00,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:33:00,569 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:33:00,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:33:00,800 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 46 proven. 54 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2022-12-14 15:33:00,800 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:33:00,800 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [487822452] [2022-12-14 15:33:00,800 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [487822452] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:33:00,800 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [485344570] [2022-12-14 15:33:00,800 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:33:00,800 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:33:00,800 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:33:00,801 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:33:00,802 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-12-14 15:33:00,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:33:00,871 INFO L263 TraceCheckSpWp]: Trace formula consists of 315 conjuncts, 22 conjunts are in the unsatisfiable core [2022-12-14 15:33:00,872 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:33:01,013 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2022-12-14 15:33:01,013 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:33:01,153 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2022-12-14 15:33:01,153 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [485344570] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:33:01,153 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [345156249] [2022-12-14 15:33:01,154 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 15:33:01,154 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:33:01,155 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:33:01,155 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:33:01,155 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:33:01,188 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 15:33:01,188 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-12-14 15:33:01,221 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 15:33:01,221 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 15:33:01,239 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 15:33:01,282 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:33:01,283 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 15:33:01,295 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 15:33:01,296 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 245 treesize of output 248 [2022-12-14 15:33:01,329 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 15:33:01,396 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:33:01,574 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12195#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:33:01,574 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:33:01,574 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:33:01,574 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 34 [2022-12-14 15:33:01,574 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1205902431] [2022-12-14 15:33:01,574 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:33:01,574 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-12-14 15:33:01,574 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:33:01,575 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-12-14 15:33:01,575 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=312, Invalid=1170, Unknown=0, NotChecked=0, Total=1482 [2022-12-14 15:33:01,575 INFO L87 Difference]: Start difference. First operand 77 states and 84 transitions. Second operand has 34 states, 34 states have (on average 1.3529411764705883) internal successors, (46), 34 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:33:01,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:33:01,897 INFO L93 Difference]: Finished difference Result 160 states and 175 transitions. [2022-12-14 15:33:01,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-12-14 15:33:01,897 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.3529411764705883) internal successors, (46), 34 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 55 [2022-12-14 15:33:01,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:33:01,898 INFO L225 Difference]: With dead ends: 160 [2022-12-14 15:33:01,898 INFO L226 Difference]: Without dead ends: 86 [2022-12-14 15:33:01,899 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 129 SyntacticMatches, 19 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 950 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=497, Invalid=1855, Unknown=0, NotChecked=0, Total=2352 [2022-12-14 15:33:01,899 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 26 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 296 mSolverCounterSat, 255 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 551 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 255 IncrementalHoareTripleChecker+Valid, 296 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:33:01,899 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 19 Invalid, 551 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [255 Valid, 296 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:33:01,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-12-14 15:33:01,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 79. [2022-12-14 15:33:01,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 78 states have (on average 1.0897435897435896) internal successors, (85), 78 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:33:01,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 85 transitions. [2022-12-14 15:33:01,951 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 85 transitions. Word has length 55 [2022-12-14 15:33:01,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:33:01,951 INFO L495 AbstractCegarLoop]: Abstraction has 79 states and 85 transitions. [2022-12-14 15:33:01,951 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 1.3529411764705883) internal successors, (46), 34 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:33:01,951 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 85 transitions. [2022-12-14 15:33:01,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-12-14 15:33:01,952 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:33:01,952 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:33:01,956 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2022-12-14 15:33:02,152 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-12-14 15:33:02,152 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:33:02,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:33:02,153 INFO L85 PathProgramCache]: Analyzing trace with hash 1667975908, now seen corresponding path program 26 times [2022-12-14 15:33:02,153 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:33:02,153 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1121077404] [2022-12-14 15:33:02,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:33:02,153 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:33:02,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:33:02,408 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 36 proven. 64 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2022-12-14 15:33:02,408 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:33:02,408 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1121077404] [2022-12-14 15:33:02,408 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1121077404] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:33:02,408 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1430025628] [2022-12-14 15:33:02,409 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:33:02,409 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:33:02,409 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:33:02,409 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:33:02,410 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-12-14 15:33:02,532 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-12-14 15:33:02,532 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:33:02,534 INFO L263 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 22 conjunts are in the unsatisfiable core [2022-12-14 15:33:02,536 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:33:02,707 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2022-12-14 15:33:02,707 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:33:02,919 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2022-12-14 15:33:02,919 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1430025628] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:33:02,919 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1457609109] [2022-12-14 15:33:02,921 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 15:33:02,921 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:33:02,921 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:33:02,921 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:33:02,921 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:33:02,963 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 15:33:02,963 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 15:33:02,972 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 15:33:02,984 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 15:33:03,021 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:33:03,023 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:33:03,033 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 15:33:03,033 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 15:33:03,069 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 15:33:03,148 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:33:03,316 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13044#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:33:03,316 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:33:03,316 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:33:03,316 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 35 [2022-12-14 15:33:03,316 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1988163568] [2022-12-14 15:33:03,316 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:33:03,316 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-12-14 15:33:03,316 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:33:03,317 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-12-14 15:33:03,317 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=311, Invalid=1249, Unknown=0, NotChecked=0, Total=1560 [2022-12-14 15:33:03,317 INFO L87 Difference]: Start difference. First operand 79 states and 85 transitions. Second operand has 35 states, 35 states have (on average 2.0) internal successors, (70), 35 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:33:03,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:33:03,612 INFO L93 Difference]: Finished difference Result 83 states and 89 transitions. [2022-12-14 15:33:03,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-12-14 15:33:03,613 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.0) internal successors, (70), 35 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2022-12-14 15:33:03,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:33:03,613 INFO L225 Difference]: With dead ends: 83 [2022-12-14 15:33:03,613 INFO L226 Difference]: Without dead ends: 60 [2022-12-14 15:33:03,614 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 132 SyntacticMatches, 20 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1244 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=517, Invalid=2135, Unknown=0, NotChecked=0, Total=2652 [2022-12-14 15:33:03,614 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 17 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 377 mSolverCounterSat, 166 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 543 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 166 IncrementalHoareTripleChecker+Valid, 377 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 15:33:03,614 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 13 Invalid, 543 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [166 Valid, 377 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 15:33:03,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2022-12-14 15:33:03,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2022-12-14 15:33:03,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.0847457627118644) internal successors, (64), 59 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:33:03,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 64 transitions. [2022-12-14 15:33:03,673 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 64 transitions. Word has length 56 [2022-12-14 15:33:03,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:33:03,673 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 64 transitions. [2022-12-14 15:33:03,673 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 2.0) internal successors, (70), 35 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:33:03,673 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 64 transitions. [2022-12-14 15:33:03,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-12-14 15:33:03,674 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:33:03,674 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:33:03,679 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2022-12-14 15:33:03,874 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-12-14 15:33:03,875 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:33:03,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:33:03,876 INFO L85 PathProgramCache]: Analyzing trace with hash 1515076873, now seen corresponding path program 27 times [2022-12-14 15:33:03,877 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:33:03,877 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1543609977] [2022-12-14 15:33:03,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:33:03,878 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:33:03,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:33:13,707 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 13 proven. 262 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:33:13,707 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:33:13,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1543609977] [2022-12-14 15:33:13,707 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1543609977] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:33:13,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [679570154] [2022-12-14 15:33:13,707 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:33:13,707 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:33:13,707 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:33:13,708 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:33:13,709 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-12-14 15:33:13,812 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:33:13,812 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:33:13,815 WARN L261 TraceCheckSpWp]: Trace formula consists of 337 conjuncts, 172 conjunts are in the unsatisfiable core [2022-12-14 15:33:13,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:33:13,897 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-12-14 15:33:17,147 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 0 proven. 220 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-12-14 15:33:17,147 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:33:20,537 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 0 proven. 220 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-12-14 15:33:20,537 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [679570154] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:33:20,538 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [998477821] [2022-12-14 15:33:20,539 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 15:33:20,539 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:33:20,539 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:33:20,539 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:33:20,539 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:33:20,572 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 15:33:20,573 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-12-14 15:33:20,603 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 15:33:20,603 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 15:33:20,632 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 15:33:20,665 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:33:20,665 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 15:33:20,681 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 15:33:20,681 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 245 treesize of output 248 [2022-12-14 15:33:20,720 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 15:33:20,787 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:33:24,853 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13796#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:33:24,853 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:33:24,853 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:33:24,853 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 26, 25] total 101 [2022-12-14 15:33:24,853 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1396333765] [2022-12-14 15:33:24,853 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:33:24,854 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 101 states [2022-12-14 15:33:24,854 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:33:24,855 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2022-12-14 15:33:24,855 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=557, Invalid=10573, Unknown=0, NotChecked=0, Total=11130 [2022-12-14 15:33:24,855 INFO L87 Difference]: Start difference. First operand 60 states and 64 transitions. Second operand has 101 states, 101 states have (on average 1.5148514851485149) internal successors, (153), 101 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:33:37,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:33:37,545 INFO L93 Difference]: Finished difference Result 103 states and 112 transitions. [2022-12-14 15:33:37,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2022-12-14 15:33:37,545 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 101 states have (on average 1.5148514851485149) internal successors, (153), 101 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 59 [2022-12-14 15:33:37,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:33:37,545 INFO L225 Difference]: With dead ends: 103 [2022-12-14 15:33:37,545 INFO L226 Difference]: Without dead ends: 100 [2022-12-14 15:33:37,547 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 83 SyntacticMatches, 46 SemanticMatches, 160 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10625 ImplicationChecksByTransitivity, 23.3s TimeCoverageRelationStatistics Valid=1589, Invalid=24493, Unknown=0, NotChecked=0, Total=26082 [2022-12-14 15:33:37,547 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 24 mSDsluCounter, 220 mSDsCounter, 0 mSdLazyCounter, 3356 mSolverCounterSat, 153 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 225 SdHoareTripleChecker+Invalid, 3509 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 153 IncrementalHoareTripleChecker+Valid, 3356 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2022-12-14 15:33:37,547 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 225 Invalid, 3509 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [153 Valid, 3356 Invalid, 0 Unknown, 0 Unchecked, 2.7s Time] [2022-12-14 15:33:37,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2022-12-14 15:33:37,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 84. [2022-12-14 15:33:37,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 83 states have (on average 1.0963855421686748) internal successors, (91), 83 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:33:37,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 91 transitions. [2022-12-14 15:33:37,596 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 91 transitions. Word has length 59 [2022-12-14 15:33:37,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:33:37,597 INFO L495 AbstractCegarLoop]: Abstraction has 84 states and 91 transitions. [2022-12-14 15:33:37,597 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 101 states, 101 states have (on average 1.5148514851485149) internal successors, (153), 101 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:33:37,597 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 91 transitions. [2022-12-14 15:33:37,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-12-14 15:33:37,597 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:33:37,597 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:33:37,602 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Ended with exit code 0 [2022-12-14 15:33:37,797 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-12-14 15:33:37,798 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:33:37,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:33:37,799 INFO L85 PathProgramCache]: Analyzing trace with hash -1780092483, now seen corresponding path program 28 times [2022-12-14 15:33:37,799 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:33:37,799 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1328781769] [2022-12-14 15:33:37,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:33:37,800 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:33:37,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:33:38,063 INFO L134 CoverageAnalysis]: Checked inductivity of 286 backedges. 56 proven. 65 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2022-12-14 15:33:38,063 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:33:38,063 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1328781769] [2022-12-14 15:33:38,064 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1328781769] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:33:38,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [588239198] [2022-12-14 15:33:38,064 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:33:38,064 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:33:38,064 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:33:38,065 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:33:38,065 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-12-14 15:33:38,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:33:38,146 INFO L263 TraceCheckSpWp]: Trace formula consists of 342 conjuncts, 24 conjunts are in the unsatisfiable core [2022-12-14 15:33:38,148 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:33:38,295 INFO L134 CoverageAnalysis]: Checked inductivity of 286 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2022-12-14 15:33:38,296 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:33:38,436 INFO L134 CoverageAnalysis]: Checked inductivity of 286 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2022-12-14 15:33:38,437 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [588239198] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:33:38,437 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1375449679] [2022-12-14 15:33:38,437 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 15:33:38,437 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:33:38,438 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:33:38,438 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:33:38,438 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:33:38,475 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 15:33:38,475 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 15:33:38,484 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 15:33:38,504 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 15:33:38,560 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:33:38,561 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 15:33:38,578 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 15:33:38,579 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 245 treesize of output 248 [2022-12-14 15:33:38,632 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 15:33:38,738 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:33:39,482 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14662#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:33:39,482 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:33:39,482 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:33:39,482 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 37 [2022-12-14 15:33:39,482 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [805252201] [2022-12-14 15:33:39,482 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:33:39,483 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-12-14 15:33:39,483 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:33:39,483 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-12-14 15:33:39,484 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=363, Invalid=1359, Unknown=0, NotChecked=0, Total=1722 [2022-12-14 15:33:39,484 INFO L87 Difference]: Start difference. First operand 84 states and 91 transitions. Second operand has 37 states, 37 states have (on average 1.3243243243243243) internal successors, (49), 37 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:33:39,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:33:39,970 INFO L93 Difference]: Finished difference Result 174 states and 189 transitions. [2022-12-14 15:33:39,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-12-14 15:33:39,971 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.3243243243243243) internal successors, (49), 37 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2022-12-14 15:33:39,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:33:39,971 INFO L225 Difference]: With dead ends: 174 [2022-12-14 15:33:39,971 INFO L226 Difference]: Without dead ends: 93 [2022-12-14 15:33:39,972 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 108 SyntacticMatches, 54 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2272 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=583, Invalid=2173, Unknown=0, NotChecked=0, Total=2756 [2022-12-14 15:33:39,972 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 33 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 344 mSolverCounterSat, 374 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 718 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 374 IncrementalHoareTripleChecker+Valid, 344 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 15:33:39,973 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 17 Invalid, 718 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [374 Valid, 344 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 15:33:39,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2022-12-14 15:33:40,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 86. [2022-12-14 15:33:40,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 85 states have (on average 1.0823529411764705) internal successors, (92), 85 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:33:40,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 92 transitions. [2022-12-14 15:33:40,028 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 92 transitions. Word has length 60 [2022-12-14 15:33:40,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:33:40,028 INFO L495 AbstractCegarLoop]: Abstraction has 86 states and 92 transitions. [2022-12-14 15:33:40,028 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.3243243243243243) internal successors, (49), 37 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:33:40,029 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 92 transitions. [2022-12-14 15:33:40,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-12-14 15:33:40,029 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:33:40,029 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:33:40,033 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2022-12-14 15:33:40,229 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:33:40,230 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:33:40,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:33:40,231 INFO L85 PathProgramCache]: Analyzing trace with hash 340101172, now seen corresponding path program 29 times [2022-12-14 15:33:40,231 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:33:40,232 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [474579191] [2022-12-14 15:33:40,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:33:40,232 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:33:40,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:33:40,558 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 45 proven. 76 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2022-12-14 15:33:40,558 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:33:40,558 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [474579191] [2022-12-14 15:33:40,558 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [474579191] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:33:40,559 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2073703258] [2022-12-14 15:33:40,559 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:33:40,559 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:33:40,559 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:33:40,560 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:33:40,560 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-12-14 15:33:40,702 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-12-14 15:33:40,702 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:33:40,704 INFO L263 TraceCheckSpWp]: Trace formula consists of 349 conjuncts, 24 conjunts are in the unsatisfiable core [2022-12-14 15:33:40,705 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:33:40,855 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2022-12-14 15:33:40,855 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:33:41,003 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2022-12-14 15:33:41,003 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2073703258] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:33:41,003 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [367852357] [2022-12-14 15:33:41,004 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 15:33:41,004 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:33:41,004 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:33:41,004 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:33:41,004 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:33:41,034 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 15:33:41,035 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-12-14 15:33:41,063 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 15:33:41,063 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 15:33:41,076 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 15:33:41,108 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:33:41,109 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:33:41,116 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 15:33:41,116 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 15:33:41,151 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 15:33:41,221 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:33:41,843 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15588#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:33:41,843 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:33:41,843 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:33:41,843 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 38 [2022-12-14 15:33:41,844 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [920146669] [2022-12-14 15:33:41,844 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:33:41,844 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-12-14 15:33:41,844 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:33:41,844 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-12-14 15:33:41,845 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=361, Invalid=1445, Unknown=0, NotChecked=0, Total=1806 [2022-12-14 15:33:41,845 INFO L87 Difference]: Start difference. First operand 86 states and 92 transitions. Second operand has 38 states, 38 states have (on average 1.9736842105263157) internal successors, (75), 38 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:33:42,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:33:42,179 INFO L93 Difference]: Finished difference Result 90 states and 96 transitions. [2022-12-14 15:33:42,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-12-14 15:33:42,179 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.9736842105263157) internal successors, (75), 38 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 61 [2022-12-14 15:33:42,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:33:42,179 INFO L225 Difference]: With dead ends: 90 [2022-12-14 15:33:42,179 INFO L226 Difference]: Without dead ends: 65 [2022-12-14 15:33:42,180 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 111 SyntacticMatches, 55 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2986 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=603, Invalid=2477, Unknown=0, NotChecked=0, Total=3080 [2022-12-14 15:33:42,180 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 14 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 426 mSolverCounterSat, 197 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 623 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 197 IncrementalHoareTripleChecker+Valid, 426 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 15:33:42,180 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 15 Invalid, 623 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [197 Valid, 426 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 15:33:42,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-12-14 15:33:42,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2022-12-14 15:33:42,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.078125) internal successors, (69), 64 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:33:42,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 69 transitions. [2022-12-14 15:33:42,218 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 69 transitions. Word has length 61 [2022-12-14 15:33:42,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:33:42,219 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 69 transitions. [2022-12-14 15:33:42,219 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.9736842105263157) internal successors, (75), 38 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:33:42,219 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 69 transitions. [2022-12-14 15:33:42,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-12-14 15:33:42,219 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:33:42,219 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:33:42,224 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Ended with exit code 0 [2022-12-14 15:33:42,420 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2022-12-14 15:33:42,420 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:33:42,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:33:42,421 INFO L85 PathProgramCache]: Analyzing trace with hash 1016925945, now seen corresponding path program 30 times [2022-12-14 15:33:42,422 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:33:42,422 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2032829008] [2022-12-14 15:33:42,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:33:42,423 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:33:42,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:33:57,010 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 28 proven. 302 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:33:57,010 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:33:57,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2032829008] [2022-12-14 15:33:57,011 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2032829008] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:33:57,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [31548395] [2022-12-14 15:33:57,011 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:33:57,011 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:33:57,011 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:33:57,012 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:33:57,012 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-12-14 15:33:57,149 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:33:57,149 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:33:57,153 WARN L261 TraceCheckSpWp]: Trace formula consists of 364 conjuncts, 188 conjunts are in the unsatisfiable core [2022-12-14 15:33:57,156 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:33:57,234 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-12-14 15:34:00,889 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 0 proven. 264 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-12-14 15:34:00,889 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:34:05,265 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 0 proven. 264 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-12-14 15:34:05,265 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [31548395] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:34:05,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1569453825] [2022-12-14 15:34:05,266 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 15:34:05,266 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:34:05,266 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:34:05,266 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:34:05,266 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:34:05,295 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 15:34:05,296 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-12-14 15:34:05,323 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 15:34:05,324 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 15:34:05,337 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 15:34:05,370 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:34:05,372 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:34:05,379 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 15:34:05,379 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 15:34:05,407 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 15:34:05,495 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:34:06,145 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16405#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:34:06,146 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:34:06,146 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:34:06,146 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 28, 27] total 110 [2022-12-14 15:34:06,146 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [672508089] [2022-12-14 15:34:06,146 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:34:06,147 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 110 states [2022-12-14 15:34:06,147 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:34:06,148 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2022-12-14 15:34:06,148 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=557, Invalid=12553, Unknown=0, NotChecked=0, Total=13110 [2022-12-14 15:34:06,148 INFO L87 Difference]: Start difference. First operand 65 states and 69 transitions. Second operand has 110 states, 110 states have (on average 1.509090909090909) internal successors, (166), 110 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:34:22,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:34:22,797 INFO L93 Difference]: Finished difference Result 111 states and 120 transitions. [2022-12-14 15:34:22,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2022-12-14 15:34:22,797 INFO L78 Accepts]: Start accepts. Automaton has has 110 states, 110 states have (on average 1.509090909090909) internal successors, (166), 110 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2022-12-14 15:34:22,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:34:22,798 INFO L225 Difference]: With dead ends: 111 [2022-12-14 15:34:22,798 INFO L226 Difference]: Without dead ends: 108 [2022-12-14 15:34:22,799 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 312 GetRequests, 130 SyntacticMatches, 10 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8353 ImplicationChecksByTransitivity, 26.0s TimeCoverageRelationStatistics Valid=1682, Invalid=28420, Unknown=0, NotChecked=0, Total=30102 [2022-12-14 15:34:22,799 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 12 mSDsluCounter, 215 mSDsCounter, 0 mSdLazyCounter, 3593 mSolverCounterSat, 192 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 220 SdHoareTripleChecker+Invalid, 3785 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 192 IncrementalHoareTripleChecker+Valid, 3593 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2022-12-14 15:34:22,799 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 220 Invalid, 3785 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [192 Valid, 3593 Invalid, 0 Unknown, 0 Unchecked, 3.3s Time] [2022-12-14 15:34:22,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2022-12-14 15:34:22,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 91. [2022-12-14 15:34:22,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 90 states have (on average 1.0888888888888888) internal successors, (98), 90 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:34:22,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 98 transitions. [2022-12-14 15:34:22,859 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 98 transitions. Word has length 64 [2022-12-14 15:34:22,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:34:22,859 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 98 transitions. [2022-12-14 15:34:22,859 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 110 states, 110 states have (on average 1.509090909090909) internal successors, (166), 110 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:34:22,859 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 98 transitions. [2022-12-14 15:34:22,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-12-14 15:34:22,859 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:34:22,859 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:34:22,864 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2022-12-14 15:34:23,060 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:34:23,061 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:34:23,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:34:23,061 INFO L85 PathProgramCache]: Analyzing trace with hash 279841403, now seen corresponding path program 31 times [2022-12-14 15:34:23,062 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:34:23,062 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1852968264] [2022-12-14 15:34:23,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:34:23,063 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:34:23,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:34:23,368 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 67 proven. 77 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2022-12-14 15:34:23,368 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:34:23,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1852968264] [2022-12-14 15:34:23,368 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1852968264] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:34:23,369 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [640987500] [2022-12-14 15:34:23,369 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:34:23,369 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:34:23,369 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:34:23,370 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:34:23,370 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-12-14 15:34:23,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:34:23,450 INFO L263 TraceCheckSpWp]: Trace formula consists of 369 conjuncts, 26 conjunts are in the unsatisfiable core [2022-12-14 15:34:23,451 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:34:23,649 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2022-12-14 15:34:23,649 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:34:23,793 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2022-12-14 15:34:23,793 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [640987500] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:34:23,793 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1147761902] [2022-12-14 15:34:23,793 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 15:34:23,794 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:34:23,794 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:34:23,794 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:34:23,794 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:34:23,832 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 15:34:23,832 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-12-14 15:34:23,859 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 15:34:23,859 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 15:34:23,873 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 15:34:23,907 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:34:23,908 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:34:23,915 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 15:34:23,915 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 15:34:23,950 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 15:34:24,008 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:34:24,206 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17340#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:34:24,206 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:34:24,206 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:34:24,206 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 40 [2022-12-14 15:34:24,207 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1214928197] [2022-12-14 15:34:24,207 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:34:24,207 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-12-14 15:34:24,207 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:34:24,207 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-12-14 15:34:24,208 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=418, Invalid=1562, Unknown=0, NotChecked=0, Total=1980 [2022-12-14 15:34:24,208 INFO L87 Difference]: Start difference. First operand 91 states and 98 transitions. Second operand has 40 states, 40 states have (on average 1.3) internal successors, (52), 40 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:34:24,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:34:24,738 INFO L93 Difference]: Finished difference Result 188 states and 203 transitions. [2022-12-14 15:34:24,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-12-14 15:34:24,738 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.3) internal successors, (52), 40 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 65 [2022-12-14 15:34:24,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:34:24,739 INFO L225 Difference]: With dead ends: 188 [2022-12-14 15:34:24,739 INFO L226 Difference]: Without dead ends: 100 [2022-12-14 15:34:24,739 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 153 SyntacticMatches, 23 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1297 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=676, Invalid=2516, Unknown=0, NotChecked=0, Total=3192 [2022-12-14 15:34:24,740 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 32 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 397 mSolverCounterSat, 378 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 775 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 378 IncrementalHoareTripleChecker+Valid, 397 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 15:34:24,740 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 13 Invalid, 775 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [378 Valid, 397 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 15:34:24,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2022-12-14 15:34:24,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 93. [2022-12-14 15:34:24,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 92 states have (on average 1.076086956521739) internal successors, (99), 92 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:34:24,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 99 transitions. [2022-12-14 15:34:24,811 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 99 transitions. Word has length 65 [2022-12-14 15:34:24,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:34:24,811 INFO L495 AbstractCegarLoop]: Abstraction has 93 states and 99 transitions. [2022-12-14 15:34:24,811 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.3) internal successors, (52), 40 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:34:24,811 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 99 transitions. [2022-12-14 15:34:24,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-12-14 15:34:24,812 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:34:24,812 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:34:24,816 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Ended with exit code 0 [2022-12-14 15:34:25,012 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:34:25,013 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:34:25,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:34:25,014 INFO L85 PathProgramCache]: Analyzing trace with hash 2007819876, now seen corresponding path program 32 times [2022-12-14 15:34:25,014 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:34:25,014 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1268501912] [2022-12-14 15:34:25,015 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:34:25,015 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:34:25,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:34:25,382 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 55 proven. 89 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2022-12-14 15:34:25,382 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:34:25,382 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1268501912] [2022-12-14 15:34:25,382 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1268501912] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:34:25,382 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [661241157] [2022-12-14 15:34:25,382 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:34:25,382 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:34:25,382 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:34:25,383 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:34:25,384 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-12-14 15:34:25,602 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-12-14 15:34:25,603 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:34:25,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 376 conjuncts, 26 conjunts are in the unsatisfiable core [2022-12-14 15:34:25,607 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:34:25,807 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 66 proven. 78 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2022-12-14 15:34:25,807 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:34:26,017 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 66 proven. 78 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2022-12-14 15:34:26,017 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [661241157] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:34:26,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1065874414] [2022-12-14 15:34:26,018 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 15:34:26,018 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:34:26,018 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:34:26,019 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:34:26,019 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:34:26,058 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 15:34:26,058 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-12-14 15:34:26,097 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 15:34:26,097 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 15:34:26,117 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 15:34:26,149 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:34:26,151 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:34:26,160 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 15:34:26,161 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 15:34:26,196 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 15:34:26,261 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:34:27,052 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18343#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:34:27,053 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:34:27,053 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:34:27,053 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 41 [2022-12-14 15:34:27,053 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1331405599] [2022-12-14 15:34:27,053 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:34:27,053 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-12-14 15:34:27,053 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:34:27,054 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-12-14 15:34:27,054 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=415, Invalid=1655, Unknown=0, NotChecked=0, Total=2070 [2022-12-14 15:34:27,055 INFO L87 Difference]: Start difference. First operand 93 states and 99 transitions. Second operand has 41 states, 41 states have (on average 1.5853658536585367) internal successors, (65), 41 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:34:27,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:34:27,537 INFO L93 Difference]: Finished difference Result 97 states and 103 transitions. [2022-12-14 15:34:27,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-12-14 15:34:27,537 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.5853658536585367) internal successors, (65), 41 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2022-12-14 15:34:27,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:34:27,538 INFO L225 Difference]: With dead ends: 97 [2022-12-14 15:34:27,538 INFO L226 Difference]: Without dead ends: 70 [2022-12-14 15:34:27,538 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 120 SyntacticMatches, 60 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3510 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=696, Invalid=2844, Unknown=0, NotChecked=0, Total=3540 [2022-12-14 15:34:27,539 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 19 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 625 mSolverCounterSat, 196 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 821 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 196 IncrementalHoareTripleChecker+Valid, 625 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 15:34:27,539 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 17 Invalid, 821 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [196 Valid, 625 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 15:34:27,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2022-12-14 15:34:27,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2022-12-14 15:34:27,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.0724637681159421) internal successors, (74), 69 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:34:27,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 74 transitions. [2022-12-14 15:34:27,587 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 74 transitions. Word has length 66 [2022-12-14 15:34:27,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:34:27,587 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 74 transitions. [2022-12-14 15:34:27,587 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.5853658536585367) internal successors, (65), 41 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:34:27,588 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 74 transitions. [2022-12-14 15:34:27,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2022-12-14 15:34:27,588 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:34:27,588 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:34:27,594 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Ended with exit code 0 [2022-12-14 15:34:27,788 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2022-12-14 15:34:27,789 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:34:27,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:34:27,790 INFO L85 PathProgramCache]: Analyzing trace with hash 403467913, now seen corresponding path program 33 times [2022-12-14 15:34:27,790 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:34:27,790 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [584677237] [2022-12-14 15:34:27,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:34:27,791 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:34:27,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:34:41,720 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 24 proven. 366 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:34:41,720 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:34:41,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [584677237] [2022-12-14 15:34:41,720 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [584677237] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:34:41,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1648926560] [2022-12-14 15:34:41,720 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:34:41,721 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:34:41,721 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:34:41,721 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:34:41,722 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-12-14 15:34:41,840 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:34:41,840 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:34:41,845 WARN L261 TraceCheckSpWp]: Trace formula consists of 391 conjuncts, 206 conjunts are in the unsatisfiable core [2022-12-14 15:34:41,847 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:34:41,921 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-12-14 15:34:45,998 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 312 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-12-14 15:34:45,998 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:34:51,457 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 312 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-12-14 15:34:51,457 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1648926560] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:34:51,458 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1650236281] [2022-12-14 15:34:51,458 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 15:34:51,459 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:34:51,459 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:34:51,459 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:34:51,459 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:34:51,495 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 15:34:51,495 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 15:34:51,504 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 15:34:51,522 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 15:34:51,554 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:34:51,556 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:34:51,563 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 15:34:51,563 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 15:34:51,591 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 15:34:51,663 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:34:57,261 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19225#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:34:57,261 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:34:57,261 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:34:57,261 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 30, 29] total 119 [2022-12-14 15:34:57,261 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1834791312] [2022-12-14 15:34:57,261 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:34:57,262 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 119 states [2022-12-14 15:34:57,262 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:34:57,263 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2022-12-14 15:34:57,263 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=668, Invalid=14584, Unknown=0, NotChecked=0, Total=15252 [2022-12-14 15:34:57,264 INFO L87 Difference]: Start difference. First operand 70 states and 74 transitions. Second operand has 119 states, 119 states have (on average 1.504201680672269) internal successors, (179), 119 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:35:17,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:35:17,369 INFO L93 Difference]: Finished difference Result 119 states and 128 transitions. [2022-12-14 15:35:17,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2022-12-14 15:35:17,369 INFO L78 Accepts]: Start accepts. Automaton has has 119 states, 119 states have (on average 1.504201680672269) internal successors, (179), 119 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2022-12-14 15:35:17,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:35:17,369 INFO L225 Difference]: With dead ends: 119 [2022-12-14 15:35:17,370 INFO L226 Difference]: Without dead ends: 116 [2022-12-14 15:35:17,371 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 100 SyntacticMatches, 51 SemanticMatches, 188 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14350 ImplicationChecksByTransitivity, 35.3s TimeCoverageRelationStatistics Valid=2062, Invalid=33848, Unknown=0, NotChecked=0, Total=35910 [2022-12-14 15:35:17,371 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 24 mSDsluCounter, 249 mSDsCounter, 0 mSdLazyCounter, 4337 mSolverCounterSat, 193 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 254 SdHoareTripleChecker+Invalid, 4530 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 193 IncrementalHoareTripleChecker+Valid, 4337 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:35:17,371 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 254 Invalid, 4530 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [193 Valid, 4337 Invalid, 0 Unknown, 0 Unchecked, 4.1s Time] [2022-12-14 15:35:17,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2022-12-14 15:35:17,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 98. [2022-12-14 15:35:17,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 97 states have (on average 1.0824742268041236) internal successors, (105), 97 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:35:17,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 105 transitions. [2022-12-14 15:35:17,443 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 105 transitions. Word has length 69 [2022-12-14 15:35:17,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:35:17,443 INFO L495 AbstractCegarLoop]: Abstraction has 98 states and 105 transitions. [2022-12-14 15:35:17,444 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 119 states, 119 states have (on average 1.504201680672269) internal successors, (179), 119 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:35:17,444 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 105 transitions. [2022-12-14 15:35:17,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-12-14 15:35:17,444 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:35:17,444 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:35:17,449 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2022-12-14 15:35:17,645 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2022-12-14 15:35:17,645 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:35:17,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:35:17,646 INFO L85 PathProgramCache]: Analyzing trace with hash 1526950141, now seen corresponding path program 34 times [2022-12-14 15:35:17,647 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:35:17,647 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [395815668] [2022-12-14 15:35:17,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:35:17,648 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:35:17,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:35:17,979 INFO L134 CoverageAnalysis]: Checked inductivity of 403 backedges. 79 proven. 90 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2022-12-14 15:35:17,980 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:35:17,980 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [395815668] [2022-12-14 15:35:17,980 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [395815668] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:35:17,980 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1297520525] [2022-12-14 15:35:17,980 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:35:17,980 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:35:17,980 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:35:17,981 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:35:17,982 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-12-14 15:35:18,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:35:18,073 INFO L263 TraceCheckSpWp]: Trace formula consists of 396 conjuncts, 28 conjunts are in the unsatisfiable core [2022-12-14 15:35:18,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:35:18,279 INFO L134 CoverageAnalysis]: Checked inductivity of 403 backedges. 91 proven. 78 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2022-12-14 15:35:18,279 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:35:18,432 INFO L134 CoverageAnalysis]: Checked inductivity of 403 backedges. 91 proven. 78 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2022-12-14 15:35:18,432 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1297520525] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:35:18,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2074370854] [2022-12-14 15:35:18,433 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 15:35:18,433 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:35:18,433 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:35:18,433 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:35:18,433 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:35:18,464 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 15:35:18,464 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-12-14 15:35:18,493 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 15:35:18,493 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 15:35:18,508 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 15:35:18,541 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:35:18,542 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 15:35:18,557 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 15:35:18,557 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 245 treesize of output 248 [2022-12-14 15:35:18,608 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 15:35:18,676 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:35:19,531 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20237#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:35:19,531 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:35:19,531 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:35:19,531 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 43 [2022-12-14 15:35:19,531 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1130717602] [2022-12-14 15:35:19,531 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:35:19,531 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-12-14 15:35:19,531 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:35:19,532 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-12-14 15:35:19,532 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=477, Invalid=1779, Unknown=0, NotChecked=0, Total=2256 [2022-12-14 15:35:19,532 INFO L87 Difference]: Start difference. First operand 98 states and 105 transitions. Second operand has 43 states, 43 states have (on average 1.2790697674418605) internal successors, (55), 43 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:35:19,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:35:19,982 INFO L93 Difference]: Finished difference Result 202 states and 217 transitions. [2022-12-14 15:35:19,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-12-14 15:35:19,982 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.2790697674418605) internal successors, (55), 43 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 70 [2022-12-14 15:35:19,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:35:19,983 INFO L225 Difference]: With dead ends: 202 [2022-12-14 15:35:19,983 INFO L226 Difference]: Without dead ends: 107 [2022-12-14 15:35:19,983 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 126 SyntacticMatches, 64 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3089 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=776, Invalid=2884, Unknown=0, NotChecked=0, Total=3660 [2022-12-14 15:35:19,983 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 40 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 374 mSolverCounterSat, 420 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 794 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 420 IncrementalHoareTripleChecker+Valid, 374 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 15:35:19,984 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 15 Invalid, 794 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [420 Valid, 374 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 15:35:19,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2022-12-14 15:35:20,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 100. [2022-12-14 15:35:20,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 99 states have (on average 1.0707070707070707) internal successors, (106), 99 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:35:20,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 106 transitions. [2022-12-14 15:35:20,067 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 106 transitions. Word has length 70 [2022-12-14 15:35:20,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:35:20,067 INFO L495 AbstractCegarLoop]: Abstraction has 100 states and 106 transitions. [2022-12-14 15:35:20,067 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 1.2790697674418605) internal successors, (55), 43 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:35:20,067 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 106 transitions. [2022-12-14 15:35:20,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-12-14 15:35:20,068 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:35:20,068 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:35:20,073 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2022-12-14 15:35:20,268 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:35:20,269 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:35:20,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:35:20,270 INFO L85 PathProgramCache]: Analyzing trace with hash -441542988, now seen corresponding path program 35 times [2022-12-14 15:35:20,271 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:35:20,271 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [341218665] [2022-12-14 15:35:20,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:35:20,272 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:35:20,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:35:20,615 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 66 proven. 103 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2022-12-14 15:35:20,615 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:35:20,615 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [341218665] [2022-12-14 15:35:20,615 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [341218665] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:35:20,615 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [713436373] [2022-12-14 15:35:20,615 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:35:20,615 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:35:20,616 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:35:20,616 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:35:20,617 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-12-14 15:35:20,817 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2022-12-14 15:35:20,817 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:35:20,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 403 conjuncts, 28 conjunts are in the unsatisfiable core [2022-12-14 15:35:20,821 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:35:21,022 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 78 proven. 91 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2022-12-14 15:35:21,022 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:35:21,256 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 78 proven. 91 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2022-12-14 15:35:21,257 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [713436373] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:35:21,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [721843790] [2022-12-14 15:35:21,257 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 15:35:21,257 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:35:21,257 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:35:21,258 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:35:21,258 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:35:21,295 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 15:35:21,296 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-12-14 15:35:21,332 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 15:35:21,333 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 15:35:21,351 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 15:35:21,391 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:35:21,393 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:35:21,400 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 15:35:21,400 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 15:35:21,428 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 15:35:21,482 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:35:21,646 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21317#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:35:21,646 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:35:21,646 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:35:21,646 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 44 [2022-12-14 15:35:21,646 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [371415564] [2022-12-14 15:35:21,646 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:35:21,646 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-12-14 15:35:21,646 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:35:21,647 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-12-14 15:35:21,647 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=473, Invalid=1879, Unknown=0, NotChecked=0, Total=2352 [2022-12-14 15:35:21,647 INFO L87 Difference]: Start difference. First operand 100 states and 106 transitions. Second operand has 44 states, 44 states have (on average 1.8863636363636365) internal successors, (83), 44 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:35:22,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:35:22,078 INFO L93 Difference]: Finished difference Result 104 states and 110 transitions. [2022-12-14 15:35:22,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-12-14 15:35:22,079 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.8863636363636365) internal successors, (83), 44 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 71 [2022-12-14 15:35:22,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:35:22,079 INFO L225 Difference]: With dead ends: 104 [2022-12-14 15:35:22,079 INFO L226 Difference]: Without dead ends: 75 [2022-12-14 15:35:22,080 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 168 SyntacticMatches, 26 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1970 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=796, Invalid=3236, Unknown=0, NotChecked=0, Total=4032 [2022-12-14 15:35:22,080 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 16 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 503 mSolverCounterSat, 260 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 763 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 260 IncrementalHoareTripleChecker+Valid, 503 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 15:35:22,080 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 11 Invalid, 763 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [260 Valid, 503 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 15:35:22,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2022-12-14 15:35:22,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2022-12-14 15:35:22,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.0675675675675675) internal successors, (79), 74 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:35:22,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 79 transitions. [2022-12-14 15:35:22,145 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 79 transitions. Word has length 71 [2022-12-14 15:35:22,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:35:22,145 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 79 transitions. [2022-12-14 15:35:22,145 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.8863636363636365) internal successors, (83), 44 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:35:22,145 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 79 transitions. [2022-12-14 15:35:22,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2022-12-14 15:35:22,145 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:35:22,146 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:35:22,151 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Ended with exit code 0 [2022-12-14 15:35:22,346 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2022-12-14 15:35:22,347 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:35:22,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:35:22,348 INFO L85 PathProgramCache]: Analyzing trace with hash -275448455, now seen corresponding path program 36 times [2022-12-14 15:35:22,348 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:35:22,348 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [802089646] [2022-12-14 15:35:22,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:35:22,349 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:35:22,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:35:39,783 INFO L134 CoverageAnalysis]: Checked inductivity of 455 backedges. 45 proven. 410 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:35:39,783 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:35:39,783 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [802089646] [2022-12-14 15:35:39,783 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [802089646] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:35:39,783 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1882097118] [2022-12-14 15:35:39,783 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:35:39,783 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:35:39,783 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:35:39,784 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:35:39,785 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-12-14 15:35:39,939 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:35:39,940 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:35:39,944 WARN L261 TraceCheckSpWp]: Trace formula consists of 418 conjuncts, 218 conjunts are in the unsatisfiable core [2022-12-14 15:35:39,946 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:35:44,153 INFO L134 CoverageAnalysis]: Checked inductivity of 455 backedges. 0 proven. 364 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2022-12-14 15:35:44,153 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:35:52,727 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 15:35:52,728 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 26 select indices, 26 select index equivalence classes, 0 disjoint index pairs (out of 325 index pairs), introduced 26 new quantified variables, introduced 325 case distinctions, treesize of input 222 treesize of output 1877 [2022-12-14 15:39:08,147 INFO L321 Elim1Store]: treesize reduction 1794, result has 2.9 percent of original size [2022-12-14 15:39:08,148 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 26 select indices, 26 select index equivalence classes, 0 disjoint index pairs (out of 325 index pairs), introduced 26 new quantified variables, introduced 325 case distinctions, treesize of input 223 treesize of output 84 [2022-12-14 15:39:08,272 INFO L134 CoverageAnalysis]: Checked inductivity of 455 backedges. 0 proven. 364 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2022-12-14 15:39:08,272 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1882097118] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:39:08,272 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1608597094] [2022-12-14 15:39:08,273 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 15:39:08,273 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:39:08,274 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:39:08,274 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:39:08,274 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:39:08,307 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 15:39:08,307 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 15:39:08,314 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 15:39:08,331 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 15:39:08,367 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:39:08,368 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:39:08,376 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 15:39:08,376 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 15:39:08,410 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 15:39:08,499 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:39:09,091 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22265#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:39:09,091 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:39:09,091 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:39:09,091 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 32, 32] total 129 [2022-12-14 15:39:09,092 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1753604469] [2022-12-14 15:39:09,092 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:39:09,092 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 129 states [2022-12-14 15:39:09,092 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:39:09,093 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 129 interpolants. [2022-12-14 15:39:09,093 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=884, Invalid=16938, Unknown=0, NotChecked=0, Total=17822 [2022-12-14 15:39:09,094 INFO L87 Difference]: Start difference. First operand 75 states and 79 transitions. Second operand has 129 states, 129 states have (on average 1.4883720930232558) internal successors, (192), 129 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:39:30,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:39:30,926 INFO L93 Difference]: Finished difference Result 127 states and 136 transitions. [2022-12-14 15:39:30,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2022-12-14 15:39:30,927 INFO L78 Accepts]: Start accepts. Automaton has has 129 states, 129 states have (on average 1.4883720930232558) internal successors, (192), 129 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 74 [2022-12-14 15:39:30,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:39:30,928 INFO L225 Difference]: With dead ends: 127 [2022-12-14 15:39:30,928 INFO L226 Difference]: Without dead ends: 124 [2022-12-14 15:39:30,929 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 364 GetRequests, 150 SyntacticMatches, 11 SemanticMatches, 203 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14781 ImplicationChecksByTransitivity, 31.7s TimeCoverageRelationStatistics Valid=2483, Invalid=39337, Unknown=0, NotChecked=0, Total=41820 [2022-12-14 15:39:30,929 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 15 mSDsluCounter, 217 mSDsCounter, 0 mSdLazyCounter, 4358 mSolverCounterSat, 217 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 222 SdHoareTripleChecker+Invalid, 4575 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 217 IncrementalHoareTripleChecker+Valid, 4358 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.5s IncrementalHoareTripleChecker+Time [2022-12-14 15:39:30,929 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 222 Invalid, 4575 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [217 Valid, 4358 Invalid, 0 Unknown, 0 Unchecked, 4.5s Time] [2022-12-14 15:39:30,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2022-12-14 15:39:31,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 105. [2022-12-14 15:39:31,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 104 states have (on average 1.0769230769230769) internal successors, (112), 104 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:39:31,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 112 transitions. [2022-12-14 15:39:31,013 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 112 transitions. Word has length 74 [2022-12-14 15:39:31,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:39:31,013 INFO L495 AbstractCegarLoop]: Abstraction has 105 states and 112 transitions. [2022-12-14 15:39:31,013 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 129 states, 129 states have (on average 1.4883720930232558) internal successors, (192), 129 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:39:31,013 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 112 transitions. [2022-12-14 15:39:31,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2022-12-14 15:39:31,014 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:39:31,014 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:39:31,020 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Ended with exit code 0 [2022-12-14 15:39:31,214 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2022-12-14 15:39:31,215 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:39:31,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:39:31,216 INFO L85 PathProgramCache]: Analyzing trace with hash 1275344187, now seen corresponding path program 37 times [2022-12-14 15:39:31,216 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:39:31,216 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1578213253] [2022-12-14 15:39:31,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:39:31,217 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:39:31,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:39:31,617 INFO L134 CoverageAnalysis]: Checked inductivity of 469 backedges. 92 proven. 104 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2022-12-14 15:39:31,617 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:39:31,617 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1578213253] [2022-12-14 15:39:31,617 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1578213253] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:39:31,618 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1952545248] [2022-12-14 15:39:31,618 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:39:31,618 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:39:31,618 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:39:31,618 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:39:31,619 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-12-14 15:39:31,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:39:31,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 423 conjuncts, 30 conjunts are in the unsatisfiable core [2022-12-14 15:39:31,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:39:32,016 INFO L134 CoverageAnalysis]: Checked inductivity of 469 backedges. 105 proven. 91 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2022-12-14 15:39:32,016 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:39:32,241 INFO L134 CoverageAnalysis]: Checked inductivity of 469 backedges. 105 proven. 91 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2022-12-14 15:39:32,242 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1952545248] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:39:32,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1635577063] [2022-12-14 15:39:32,243 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 15:39:32,243 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:39:32,243 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:39:32,243 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:39:32,243 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:39:32,277 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 15:39:32,277 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-12-14 15:39:32,308 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 15:39:32,309 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 15:39:32,326 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 15:39:32,361 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:39:32,363 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:39:32,371 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 15:39:32,371 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 15:39:32,404 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 15:39:32,465 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:39:33,851 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23350#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:39:33,851 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:39:33,851 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:39:33,851 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 46 [2022-12-14 15:39:33,852 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [469248985] [2022-12-14 15:39:33,852 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:39:33,852 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-12-14 15:39:33,852 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:39:33,853 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-12-14 15:39:33,853 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=540, Invalid=2010, Unknown=0, NotChecked=0, Total=2550 [2022-12-14 15:39:33,853 INFO L87 Difference]: Start difference. First operand 105 states and 112 transitions. Second operand has 46 states, 46 states have (on average 1.2608695652173914) internal successors, (58), 46 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:39:34,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:39:34,614 INFO L93 Difference]: Finished difference Result 216 states and 231 transitions. [2022-12-14 15:39:34,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-12-14 15:39:34,614 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.2608695652173914) internal successors, (58), 46 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 75 [2022-12-14 15:39:34,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:39:34,615 INFO L225 Difference]: With dead ends: 216 [2022-12-14 15:39:34,615 INFO L226 Difference]: Without dead ends: 114 [2022-12-14 15:39:34,615 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 135 SyntacticMatches, 69 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3544 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=883, Invalid=3277, Unknown=0, NotChecked=0, Total=4160 [2022-12-14 15:39:34,616 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 29 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 484 mSolverCounterSat, 426 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 910 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 426 IncrementalHoareTripleChecker+Valid, 484 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 15:39:34,616 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 15 Invalid, 910 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [426 Valid, 484 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 15:39:34,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2022-12-14 15:39:34,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 107. [2022-12-14 15:39:34,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 106 states have (on average 1.0660377358490567) internal successors, (113), 106 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:39:34,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 113 transitions. [2022-12-14 15:39:34,716 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 113 transitions. Word has length 75 [2022-12-14 15:39:34,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:39:34,716 INFO L495 AbstractCegarLoop]: Abstraction has 107 states and 113 transitions. [2022-12-14 15:39:34,716 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 1.2608695652173914) internal successors, (58), 46 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:39:34,717 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 113 transitions. [2022-12-14 15:39:34,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-12-14 15:39:34,717 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:39:34,717 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:39:34,721 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Ended with exit code 0 [2022-12-14 15:39:34,917 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2022-12-14 15:39:34,918 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:39:34,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:39:34,919 INFO L85 PathProgramCache]: Analyzing trace with hash -1231814172, now seen corresponding path program 38 times [2022-12-14 15:39:34,919 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:39:34,919 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [300832370] [2022-12-14 15:39:34,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:39:34,920 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:39:34,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:39:35,382 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 78 proven. 118 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2022-12-14 15:39:35,382 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:39:35,383 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [300832370] [2022-12-14 15:39:35,383 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [300832370] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:39:35,383 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1602337637] [2022-12-14 15:39:35,383 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:39:35,383 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:39:35,383 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:39:35,384 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:39:35,384 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-12-14 15:39:35,597 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2022-12-14 15:39:35,597 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:39:35,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 430 conjuncts, 30 conjunts are in the unsatisfiable core [2022-12-14 15:39:35,602 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:39:35,878 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 91 proven. 105 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2022-12-14 15:39:35,878 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:39:36,157 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 91 proven. 105 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2022-12-14 15:39:36,157 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1602337637] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:39:36,158 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1737832752] [2022-12-14 15:39:36,158 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 15:39:36,159 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:39:36,159 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:39:36,159 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:39:36,159 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:39:36,201 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 15:39:36,201 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-12-14 15:39:36,239 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 15:39:36,239 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 15:39:36,258 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 15:39:36,291 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:39:36,292 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 15:39:36,310 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 15:39:36,310 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 245 treesize of output 248 [2022-12-14 15:39:36,348 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 15:39:36,408 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:39:36,616 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24507#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:39:36,616 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:39:36,617 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:39:36,617 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 47 [2022-12-14 15:39:36,617 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1757327166] [2022-12-14 15:39:36,617 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:39:36,617 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-12-14 15:39:36,617 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:39:36,618 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-12-14 15:39:36,618 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=535, Invalid=2117, Unknown=0, NotChecked=0, Total=2652 [2022-12-14 15:39:36,618 INFO L87 Difference]: Start difference. First operand 107 states and 113 transitions. Second operand has 47 states, 47 states have (on average 1.9148936170212767) internal successors, (90), 47 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:39:37,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:39:37,260 INFO L93 Difference]: Finished difference Result 111 states and 117 transitions. [2022-12-14 15:39:37,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-12-14 15:39:37,260 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.9148936170212767) internal successors, (90), 47 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 76 [2022-12-14 15:39:37,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:39:37,261 INFO L225 Difference]: With dead ends: 111 [2022-12-14 15:39:37,261 INFO L226 Difference]: Without dead ends: 80 [2022-12-14 15:39:37,261 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 274 GetRequests, 180 SyntacticMatches, 28 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2248 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=903, Invalid=3653, Unknown=0, NotChecked=0, Total=4556 [2022-12-14 15:39:37,261 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 17 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 641 mSolverCounterSat, 287 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 928 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 287 IncrementalHoareTripleChecker+Valid, 641 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 15:39:37,261 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 13 Invalid, 928 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [287 Valid, 641 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 15:39:37,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2022-12-14 15:39:37,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 80. [2022-12-14 15:39:37,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.0632911392405062) internal successors, (84), 79 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:39:37,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 84 transitions. [2022-12-14 15:39:37,330 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 84 transitions. Word has length 76 [2022-12-14 15:39:37,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:39:37,330 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 84 transitions. [2022-12-14 15:39:37,330 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 1.9148936170212767) internal successors, (90), 47 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:39:37,330 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 84 transitions. [2022-12-14 15:39:37,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-12-14 15:39:37,330 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:39:37,330 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:39:37,335 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Ended with exit code 0 [2022-12-14 15:39:37,531 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-12-14 15:39:37,532 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:39:37,532 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:39:37,532 INFO L85 PathProgramCache]: Analyzing trace with hash -507207671, now seen corresponding path program 39 times [2022-12-14 15:39:37,533 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:39:37,533 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [92003541] [2022-12-14 15:39:37,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:39:37,533 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:39:37,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:39:58,817 INFO L134 CoverageAnalysis]: Checked inductivity of 525 backedges. 37 proven. 488 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:39:58,817 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:39:58,817 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [92003541] [2022-12-14 15:39:58,817 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [92003541] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:39:58,817 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [60641256] [2022-12-14 15:39:58,817 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:39:58,817 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:39:58,818 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:39:58,818 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:39:58,819 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-12-14 15:39:58,990 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:39:58,990 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:39:58,995 WARN L261 TraceCheckSpWp]: Trace formula consists of 445 conjuncts, 236 conjunts are in the unsatisfiable core [2022-12-14 15:39:58,998 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:39:59,099 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-12-14 15:40:04,682 INFO L134 CoverageAnalysis]: Checked inductivity of 525 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2022-12-14 15:40:04,683 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:40:11,136 INFO L134 CoverageAnalysis]: Checked inductivity of 525 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2022-12-14 15:40:11,136 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [60641256] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:40:11,136 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1238659633] [2022-12-14 15:40:11,137 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 15:40:11,137 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:40:11,137 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:40:11,137 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:40:11,137 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:40:11,168 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 15:40:11,168 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 15:40:11,174 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 15:40:11,186 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 15:40:11,217 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:40:11,218 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 15:40:11,232 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 15:40:11,232 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 245 treesize of output 248 [2022-12-14 15:40:11,272 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 15:40:11,327 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:40:12,018 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '25519#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:40:12,018 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:40:12,018 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:40:12,018 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [78, 34, 33] total 137 [2022-12-14 15:40:12,018 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1311134177] [2022-12-14 15:40:12,018 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:40:12,019 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 137 states [2022-12-14 15:40:12,019 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:40:12,019 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 137 interpolants. [2022-12-14 15:40:12,020 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=978, Invalid=19044, Unknown=0, NotChecked=0, Total=20022 [2022-12-14 15:40:12,020 INFO L87 Difference]: Start difference. First operand 80 states and 84 transitions. Second operand has 137 states, 137 states have (on average 1.4963503649635037) internal successors, (205), 137 states have internal predecessors, (205), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:40:37,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:40:37,859 INFO L93 Difference]: Finished difference Result 135 states and 144 transitions. [2022-12-14 15:40:37,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2022-12-14 15:40:37,859 INFO L78 Accepts]: Start accepts. Automaton has has 137 states, 137 states have (on average 1.4963503649635037) internal successors, (205), 137 states have internal predecessors, (205), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 79 [2022-12-14 15:40:37,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:40:37,860 INFO L225 Difference]: With dead ends: 135 [2022-12-14 15:40:37,860 INFO L226 Difference]: Without dead ends: 132 [2022-12-14 15:40:37,861 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 388 GetRequests, 158 SyntacticMatches, 15 SemanticMatches, 215 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16534 ImplicationChecksByTransitivity, 39.0s TimeCoverageRelationStatistics Valid=2710, Invalid=44162, Unknown=0, NotChecked=0, Total=46872 [2022-12-14 15:40:37,862 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 20 mSDsluCounter, 256 mSDsCounter, 0 mSdLazyCounter, 5281 mSolverCounterSat, 249 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 261 SdHoareTripleChecker+Invalid, 5530 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 249 IncrementalHoareTripleChecker+Valid, 5281 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.7s IncrementalHoareTripleChecker+Time [2022-12-14 15:40:37,862 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 261 Invalid, 5530 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [249 Valid, 5281 Invalid, 0 Unknown, 0 Unchecked, 5.7s Time] [2022-12-14 15:40:37,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2022-12-14 15:40:37,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 112. [2022-12-14 15:40:37,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 111 states have (on average 1.072072072072072) internal successors, (119), 111 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:40:37,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 119 transitions. [2022-12-14 15:40:37,959 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 119 transitions. Word has length 79 [2022-12-14 15:40:37,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:40:37,960 INFO L495 AbstractCegarLoop]: Abstraction has 112 states and 119 transitions. [2022-12-14 15:40:37,960 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 137 states, 137 states have (on average 1.4963503649635037) internal successors, (205), 137 states have internal predecessors, (205), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:40:37,960 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 119 transitions. [2022-12-14 15:40:37,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2022-12-14 15:40:37,960 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:40:37,960 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:40:37,965 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Ended with exit code 0 [2022-12-14 15:40:38,161 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:40:38,161 INFO L420 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:40:38,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:40:38,162 INFO L85 PathProgramCache]: Analyzing trace with hash -1687424963, now seen corresponding path program 40 times [2022-12-14 15:40:38,162 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:40:38,163 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1339025229] [2022-12-14 15:40:38,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:40:38,163 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:40:38,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:40:38,580 INFO L134 CoverageAnalysis]: Checked inductivity of 540 backedges. 106 proven. 119 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2022-12-14 15:40:38,580 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:40:38,581 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1339025229] [2022-12-14 15:40:38,581 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1339025229] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:40:38,581 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1490473651] [2022-12-14 15:40:38,581 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:40:38,581 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:40:38,581 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:40:38,582 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:40:38,582 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2022-12-14 15:40:38,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:40:38,722 INFO L263 TraceCheckSpWp]: Trace formula consists of 450 conjuncts, 32 conjunts are in the unsatisfiable core [2022-12-14 15:40:38,723 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:40:39,022 INFO L134 CoverageAnalysis]: Checked inductivity of 540 backedges. 120 proven. 105 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2022-12-14 15:40:39,022 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:40:39,272 INFO L134 CoverageAnalysis]: Checked inductivity of 540 backedges. 120 proven. 105 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2022-12-14 15:40:39,272 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1490473651] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:40:39,272 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [356907224] [2022-12-14 15:40:39,273 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 15:40:39,273 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:40:39,273 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:40:39,273 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:40:39,273 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:40:39,307 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 15:40:39,307 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-12-14 15:40:39,342 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 15:40:39,342 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 15:40:39,358 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 15:40:39,391 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:40:39,392 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 15:40:39,407 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 15:40:39,407 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 245 treesize of output 248 [2022-12-14 15:40:39,459 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 15:40:39,535 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:40:40,652 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26675#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:40:40,652 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:40:40,652 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:40:40,653 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 49 [2022-12-14 15:40:40,653 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1104747684] [2022-12-14 15:40:40,653 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:40:40,653 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-12-14 15:40:40,653 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:40:40,653 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-12-14 15:40:40,654 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=607, Invalid=2255, Unknown=0, NotChecked=0, Total=2862 [2022-12-14 15:40:40,654 INFO L87 Difference]: Start difference. First operand 112 states and 119 transitions. Second operand has 49 states, 49 states have (on average 1.2448979591836735) internal successors, (61), 49 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:40:41,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:40:41,513 INFO L93 Difference]: Finished difference Result 230 states and 245 transitions. [2022-12-14 15:40:41,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-12-14 15:40:41,513 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.2448979591836735) internal successors, (61), 49 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 80 [2022-12-14 15:40:41,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:40:41,514 INFO L225 Difference]: With dead ends: 230 [2022-12-14 15:40:41,514 INFO L226 Difference]: Without dead ends: 121 [2022-12-14 15:40:41,515 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 144 SyntacticMatches, 74 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4030 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=997, Invalid=3695, Unknown=0, NotChecked=0, Total=4692 [2022-12-14 15:40:41,515 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 32 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 457 mSolverCounterSat, 437 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 894 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 437 IncrementalHoareTripleChecker+Valid, 457 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 15:40:41,515 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 17 Invalid, 894 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [437 Valid, 457 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 15:40:41,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2022-12-14 15:40:41,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 114. [2022-12-14 15:40:41,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 113 states have (on average 1.0619469026548674) internal successors, (120), 113 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:40:41,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 120 transitions. [2022-12-14 15:40:41,635 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 120 transitions. Word has length 80 [2022-12-14 15:40:41,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:40:41,635 INFO L495 AbstractCegarLoop]: Abstraction has 114 states and 120 transitions. [2022-12-14 15:40:41,635 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.2448979591836735) internal successors, (61), 49 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:40:41,636 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 120 transitions. [2022-12-14 15:40:41,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2022-12-14 15:40:41,636 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:40:41,636 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:40:41,640 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Ended with exit code 0 [2022-12-14 15:40:41,836 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable41 [2022-12-14 15:40:41,837 INFO L420 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:40:41,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:40:41,838 INFO L85 PathProgramCache]: Analyzing trace with hash -1354848972, now seen corresponding path program 41 times [2022-12-14 15:40:41,839 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:40:41,839 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1935316270] [2022-12-14 15:40:41,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:40:41,839 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:40:41,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:40:42,332 INFO L134 CoverageAnalysis]: Checked inductivity of 555 backedges. 91 proven. 134 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2022-12-14 15:40:42,332 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:40:42,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1935316270] [2022-12-14 15:40:42,332 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1935316270] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:40:42,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [589975736] [2022-12-14 15:40:42,332 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:40:42,332 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:40:42,332 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:40:42,333 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:40:42,334 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-12-14 15:40:42,602 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-12-14 15:40:42,602 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:40:42,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 457 conjuncts, 32 conjunts are in the unsatisfiable core [2022-12-14 15:40:42,606 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:40:42,919 INFO L134 CoverageAnalysis]: Checked inductivity of 555 backedges. 105 proven. 120 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2022-12-14 15:40:42,919 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:40:43,260 INFO L134 CoverageAnalysis]: Checked inductivity of 555 backedges. 105 proven. 120 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2022-12-14 15:40:43,261 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [589975736] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:40:43,261 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [346164985] [2022-12-14 15:40:43,261 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 15:40:43,261 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:40:43,262 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:40:43,262 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:40:43,262 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:40:43,300 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 15:40:43,300 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-12-14 15:40:43,335 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 15:40:43,336 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 15:40:43,350 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 15:40:43,382 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:40:43,383 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:40:43,391 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 15:40:43,392 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 15:40:43,418 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 15:40:43,470 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:40:43,661 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '27909#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:40:43,661 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:40:43,661 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:40:43,661 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 50 [2022-12-14 15:40:43,661 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1186071963] [2022-12-14 15:40:43,661 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:40:43,661 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-12-14 15:40:43,661 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:40:43,662 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-12-14 15:40:43,662 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=2369, Unknown=0, NotChecked=0, Total=2970 [2022-12-14 15:40:43,662 INFO L87 Difference]: Start difference. First operand 114 states and 120 transitions. Second operand has 50 states, 50 states have (on average 1.58) internal successors, (79), 50 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:40:44,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:40:44,243 INFO L93 Difference]: Finished difference Result 118 states and 124 transitions. [2022-12-14 15:40:44,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-12-14 15:40:44,243 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 1.58) internal successors, (79), 50 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 81 [2022-12-14 15:40:44,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:40:44,244 INFO L225 Difference]: With dead ends: 118 [2022-12-14 15:40:44,244 INFO L226 Difference]: Without dead ends: 85 [2022-12-14 15:40:44,245 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 291 GetRequests, 191 SyntacticMatches, 30 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2544 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1017, Invalid=4095, Unknown=0, NotChecked=0, Total=5112 [2022-12-14 15:40:44,245 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 17 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 723 mSolverCounterSat, 317 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 1040 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 317 IncrementalHoareTripleChecker+Valid, 723 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 15:40:44,245 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 17 Invalid, 1040 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [317 Valid, 723 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 15:40:44,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2022-12-14 15:40:44,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2022-12-14 15:40:44,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.0595238095238095) internal successors, (89), 84 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:40:44,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 89 transitions. [2022-12-14 15:40:44,332 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 89 transitions. Word has length 81 [2022-12-14 15:40:44,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:40:44,332 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 89 transitions. [2022-12-14 15:40:44,332 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 1.58) internal successors, (79), 50 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:40:44,332 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 89 transitions. [2022-12-14 15:40:44,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2022-12-14 15:40:44,333 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:40:44,333 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:40:44,338 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Ended with exit code 0 [2022-12-14 15:40:44,534 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:40:44,534 INFO L420 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:40:44,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:40:44,535 INFO L85 PathProgramCache]: Analyzing trace with hash 1973513209, now seen corresponding path program 42 times [2022-12-14 15:40:44,535 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:40:44,536 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [803929962] [2022-12-14 15:40:44,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:40:44,536 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:40:44,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:41:07,497 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 66 proven. 534 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:41:07,497 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:41:07,497 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [803929962] [2022-12-14 15:41:07,498 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [803929962] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:41:07,498 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [704514175] [2022-12-14 15:41:07,498 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:41:07,498 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:41:07,498 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:41:07,499 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:41:07,499 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2022-12-14 15:41:07,721 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:41:07,721 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:41:07,726 WARN L261 TraceCheckSpWp]: Trace formula consists of 472 conjuncts, 252 conjunts are in the unsatisfiable core [2022-12-14 15:41:07,729 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:41:07,831 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-12-14 15:41:14,966 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 480 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2022-12-14 15:41:14,966 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:41:22,671 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 480 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2022-12-14 15:41:22,671 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [704514175] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:41:22,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [321610682] [2022-12-14 15:41:22,672 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 15:41:22,672 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:41:22,672 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:41:22,672 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:41:22,672 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:41:22,704 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 15:41:22,704 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-12-14 15:41:22,735 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 15:41:22,736 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 15:41:22,750 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 15:41:22,781 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:41:22,782 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:41:22,791 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 15:41:22,791 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 15:41:22,824 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 15:41:22,896 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:41:29,036 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '28985#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:41:29,036 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:41:29,036 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:41:29,036 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [83, 36, 35] total 146 [2022-12-14 15:41:29,036 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [194557382] [2022-12-14 15:41:29,037 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:41:29,037 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 146 states [2022-12-14 15:41:29,037 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:41:29,037 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 146 interpolants. [2022-12-14 15:41:29,038 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1111, Invalid=21539, Unknown=0, NotChecked=0, Total=22650 [2022-12-14 15:41:29,038 INFO L87 Difference]: Start difference. First operand 85 states and 89 transitions. Second operand has 146 states, 146 states have (on average 1.4931506849315068) internal successors, (218), 146 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:41:57,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:41:57,881 INFO L93 Difference]: Finished difference Result 143 states and 152 transitions. [2022-12-14 15:41:57,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2022-12-14 15:41:57,881 INFO L78 Accepts]: Start accepts. Automaton has has 146 states, 146 states have (on average 1.4931506849315068) internal successors, (218), 146 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 84 [2022-12-14 15:41:57,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:41:57,882 INFO L225 Difference]: With dead ends: 143 [2022-12-14 15:41:57,882 INFO L226 Difference]: Without dead ends: 140 [2022-12-14 15:41:57,883 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 412 GetRequests, 120 SyntacticMatches, 64 SemanticMatches, 228 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26012 ImplicationChecksByTransitivity, 50.1s TimeCoverageRelationStatistics Valid=3047, Invalid=49623, Unknown=0, NotChecked=0, Total=52670 [2022-12-14 15:41:57,884 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 11 mSDsluCounter, 245 mSDsCounter, 0 mSdLazyCounter, 5383 mSolverCounterSat, 179 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 250 SdHoareTripleChecker+Invalid, 5562 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 179 IncrementalHoareTripleChecker+Valid, 5383 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:41:57,884 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 250 Invalid, 5562 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [179 Valid, 5383 Invalid, 0 Unknown, 0 Unchecked, 6.1s Time] [2022-12-14 15:41:57,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2022-12-14 15:41:58,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 119. [2022-12-14 15:41:58,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 118 states have (on average 1.0677966101694916) internal successors, (126), 118 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:41:58,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 126 transitions. [2022-12-14 15:41:58,002 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 126 transitions. Word has length 84 [2022-12-14 15:41:58,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:41:58,002 INFO L495 AbstractCegarLoop]: Abstraction has 119 states and 126 transitions. [2022-12-14 15:41:58,003 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 146 states, 146 states have (on average 1.4931506849315068) internal successors, (218), 146 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:41:58,003 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 126 transitions. [2022-12-14 15:41:58,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-12-14 15:41:58,003 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:41:58,003 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:41:58,009 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Ended with exit code 0 [2022-12-14 15:41:58,204 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:41:58,204 INFO L420 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:41:58,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:41:58,204 INFO L85 PathProgramCache]: Analyzing trace with hash 1774047227, now seen corresponding path program 43 times [2022-12-14 15:41:58,205 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:41:58,205 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [165412272] [2022-12-14 15:41:58,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:41:58,205 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:41:58,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:41:58,639 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 121 proven. 135 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2022-12-14 15:41:58,640 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:41:58,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [165412272] [2022-12-14 15:41:58,640 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [165412272] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:41:58,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1539443765] [2022-12-14 15:41:58,640 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:41:58,640 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:41:58,640 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:41:58,641 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:41:58,641 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2022-12-14 15:41:58,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:41:58,750 INFO L263 TraceCheckSpWp]: Trace formula consists of 477 conjuncts, 34 conjunts are in the unsatisfiable core [2022-12-14 15:41:58,752 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:41:59,062 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 136 proven. 120 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2022-12-14 15:41:59,062 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:41:59,336 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 136 proven. 120 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2022-12-14 15:41:59,336 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1539443765] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:41:59,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1333165850] [2022-12-14 15:41:59,337 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 15:41:59,337 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:41:59,338 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:41:59,338 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:41:59,338 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:41:59,379 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 15:41:59,379 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 15:41:59,388 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-12-14 15:41:59,400 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-12-14 15:41:59,431 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:41:59,431 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 15:41:59,445 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-12-14 15:41:59,445 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 245 treesize of output 248 [2022-12-14 15:41:59,496 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 15:41:59,563 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:42:01,046 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30212#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:42:01,046 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:42:01,046 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:42:01,046 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 52 [2022-12-14 15:42:01,046 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [506705026] [2022-12-14 15:42:01,046 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:42:01,046 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-12-14 15:42:01,047 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:42:01,047 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-12-14 15:42:01,047 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=678, Invalid=2514, Unknown=0, NotChecked=0, Total=3192 [2022-12-14 15:42:01,048 INFO L87 Difference]: Start difference. First operand 119 states and 126 transitions. Second operand has 52 states, 52 states have (on average 1.2307692307692308) internal successors, (64), 52 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:42:02,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:42:02,041 INFO L93 Difference]: Finished difference Result 244 states and 259 transitions. [2022-12-14 15:42:02,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-12-14 15:42:02,042 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 1.2307692307692308) internal successors, (64), 52 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 85 [2022-12-14 15:42:02,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:42:02,042 INFO L225 Difference]: With dead ends: 244 [2022-12-14 15:42:02,042 INFO L226 Difference]: Without dead ends: 128 [2022-12-14 15:42:02,043 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 303 GetRequests, 153 SyntacticMatches, 79 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4547 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1118, Invalid=4138, Unknown=0, NotChecked=0, Total=5256 [2022-12-14 15:42:02,043 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 47 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 448 mSolverCounterSat, 691 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 1139 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 691 IncrementalHoareTripleChecker+Valid, 448 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 15:42:02,044 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 17 Invalid, 1139 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [691 Valid, 448 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 15:42:02,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2022-12-14 15:42:02,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 121. [2022-12-14 15:42:02,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 120 states have (on average 1.0583333333333333) internal successors, (127), 120 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:42:02,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 127 transitions. [2022-12-14 15:42:02,191 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 127 transitions. Word has length 85 [2022-12-14 15:42:02,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:42:02,191 INFO L495 AbstractCegarLoop]: Abstraction has 121 states and 127 transitions. [2022-12-14 15:42:02,191 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 1.2307692307692308) internal successors, (64), 52 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:42:02,191 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 127 transitions. [2022-12-14 15:42:02,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2022-12-14 15:42:02,192 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:42:02,192 INFO L195 NwaCegarLoop]: trace histogram [16, 16, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:42:02,196 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Ended with exit code 0 [2022-12-14 15:42:02,392 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2022-12-14 15:42:02,393 INFO L420 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:42:02,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:42:02,394 INFO L85 PathProgramCache]: Analyzing trace with hash -1225220764, now seen corresponding path program 44 times [2022-12-14 15:42:02,394 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:42:02,394 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [472018291] [2022-12-14 15:42:02,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:42:02,395 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:42:02,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:42:02,901 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 105 proven. 151 refuted. 0 times theorem prover too weak. 376 trivial. 0 not checked. [2022-12-14 15:42:02,901 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:42:02,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [472018291] [2022-12-14 15:42:02,901 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [472018291] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:42:02,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [891019542] [2022-12-14 15:42:02,902 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:42:02,902 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:42:02,902 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:42:02,902 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:42:02,903 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2022-12-14 15:42:03,305 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-12-14 15:42:03,306 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:42:03,309 INFO L263 TraceCheckSpWp]: Trace formula consists of 484 conjuncts, 34 conjunts are in the unsatisfiable core [2022-12-14 15:42:03,310 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:42:03,558 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 120 proven. 136 refuted. 0 times theorem prover too weak. 376 trivial. 0 not checked. [2022-12-14 15:42:03,559 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:42:03,818 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 120 proven. 136 refuted. 0 times theorem prover too weak. 376 trivial. 0 not checked. [2022-12-14 15:42:03,818 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [891019542] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:42:03,818 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [374685185] [2022-12-14 15:42:03,819 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 15:42:03,819 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:42:03,819 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:42:03,820 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:42:03,820 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:42:03,851 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-12-14 15:42:03,852 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 46 [2022-12-14 15:42:03,885 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 15:42:03,885 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-12-14 15:42:03,905 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-12-14 15:42:03,936 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:42:03,937 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 15:42:03,948 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-12-14 15:42:03,948 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 250 treesize of output 247 [2022-12-14 15:42:03,987 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 15:42:04,041 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:42:04,217 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '31523#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:42:04,217 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:42:04,217 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:42:04,217 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 53 [2022-12-14 15:42:04,217 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1395892962] [2022-12-14 15:42:04,217 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:42:04,218 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2022-12-14 15:42:04,218 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:42:04,218 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2022-12-14 15:42:04,218 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=671, Invalid=2635, Unknown=0, NotChecked=0, Total=3306 [2022-12-14 15:42:04,219 INFO L87 Difference]: Start difference. First operand 121 states and 127 transitions. Second operand has 53 states, 53 states have (on average 1.2075471698113207) internal successors, (64), 53 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:42:04,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:42:04,843 INFO L93 Difference]: Finished difference Result 125 states and 131 transitions. [2022-12-14 15:42:04,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-12-14 15:42:04,843 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.2075471698113207) internal successors, (64), 53 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 86 [2022-12-14 15:42:04,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:42:04,843 INFO L225 Difference]: With dead ends: 125 [2022-12-14 15:42:04,843 INFO L226 Difference]: Without dead ends: 90 [2022-12-14 15:42:04,844 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 309 GetRequests, 203 SyntacticMatches, 32 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2858 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1138, Invalid=4562, Unknown=0, NotChecked=0, Total=5700 [2022-12-14 15:42:04,844 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 20 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 608 mSolverCounterSat, 487 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 1095 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 487 IncrementalHoareTripleChecker+Valid, 608 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 15:42:04,844 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 11 Invalid, 1095 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [487 Valid, 608 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 15:42:04,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2022-12-14 15:42:04,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2022-12-14 15:42:04,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 89 states have (on average 1.0561797752808988) internal successors, (94), 89 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:42:04,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 94 transitions. [2022-12-14 15:42:04,936 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 94 transitions. Word has length 86 [2022-12-14 15:42:04,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:42:04,936 INFO L495 AbstractCegarLoop]: Abstraction has 90 states and 94 transitions. [2022-12-14 15:42:04,936 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 1.2075471698113207) internal successors, (64), 53 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:42:04,936 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 94 transitions. [2022-12-14 15:42:04,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2022-12-14 15:42:04,936 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:42:04,936 INFO L195 NwaCegarLoop]: trace histogram [16, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:42:04,941 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Ended with exit code 0 [2022-12-14 15:42:05,137 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2022-12-14 15:42:05,137 INFO L420 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:42:05,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:42:05,138 INFO L85 PathProgramCache]: Analyzing trace with hash -262221431, now seen corresponding path program 45 times [2022-12-14 15:42:05,138 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:42:05,139 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [27280720] [2022-12-14 15:42:05,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:42:05,139 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:42:05,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:42:34,872 INFO L134 CoverageAnalysis]: Checked inductivity of 680 backedges. 28 proven. 652 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:42:34,872 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:42:34,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [27280720] [2022-12-14 15:42:34,873 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [27280720] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:42:34,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [603763602] [2022-12-14 15:42:34,873 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:42:34,873 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:42:34,873 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:42:34,874 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:42:34,874 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6699097-a3b8-4290-909c-1415e9654460/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2022-12-14 15:42:35,086 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:42:35,086 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:42:35,091 WARN L261 TraceCheckSpWp]: Trace formula consists of 499 conjuncts, 268 conjunts are in the unsatisfiable core [2022-12-14 15:42:35,094 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:42:43,529 INFO L134 CoverageAnalysis]: Checked inductivity of 680 backedges. 0 proven. 544 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2022-12-14 15:42:43,529 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:43:02,719 WARN L233 SmtUtils]: Spent 8.15s on a formula simplification that was a NOOP. DAG size: 865 (called from [L 318] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.Elim1Store.elim1) [2022-12-14 15:43:02,720 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 15:43:02,721 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 32 select indices, 32 select index equivalence classes, 0 disjoint index pairs (out of 496 index pairs), introduced 32 new quantified variables, introduced 496 case distinctions, treesize of input 273 treesize of output 2837