./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-invgen/half_2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version e04fb08f 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_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-invgen/half_2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 0b362a98d328467ff4a069dbed2be3429090ca070e60d49c76297e4bb94402b7 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-e04fb08 [2022-11-16 15:53:30,941 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-16 15:53:30,944 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-16 15:53:30,986 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-16 15:53:30,987 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-16 15:53:30,991 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-16 15:53:30,993 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-16 15:53:30,996 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-16 15:53:31,000 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-16 15:53:31,008 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-16 15:53:31,010 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-16 15:53:31,012 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-16 15:53:31,012 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-16 15:53:31,015 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-16 15:53:31,016 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-16 15:53:31,018 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-16 15:53:31,019 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-16 15:53:31,020 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-16 15:53:31,022 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-16 15:53:31,027 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-16 15:53:31,029 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-16 15:53:31,030 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-16 15:53:31,033 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-16 15:53:31,034 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-16 15:53:31,044 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-16 15:53:31,044 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-16 15:53:31,045 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-16 15:53:31,047 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-16 15:53:31,047 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-16 15:53:31,048 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-16 15:53:31,049 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-16 15:53:31,050 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-16 15:53:31,052 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-16 15:53:31,054 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-16 15:53:31,055 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-16 15:53:31,055 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-16 15:53:31,056 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-16 15:53:31,056 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-16 15:53:31,057 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-16 15:53:31,058 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-16 15:53:31,058 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-16 15:53:31,059 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-16 15:53:31,105 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-16 15:53:31,106 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-16 15:53:31,106 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-16 15:53:31,107 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-16 15:53:31,107 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-16 15:53:31,108 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-16 15:53:31,108 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-16 15:53:31,108 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-16 15:53:31,109 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-16 15:53:31,109 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-16 15:53:31,110 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-16 15:53:31,110 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-16 15:53:31,110 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-16 15:53:31,111 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-16 15:53:31,111 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-16 15:53:31,111 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-16 15:53:31,111 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-16 15:53:31,112 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-16 15:53:31,112 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-16 15:53:31,113 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-16 15:53:31,113 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-16 15:53:31,113 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-16 15:53:31,113 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-16 15:53:31,115 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-16 15:53:31,115 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-16 15:53:31,115 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-16 15:53:31,115 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-16 15:53:31,116 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-16 15:53:31,116 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-16 15:53:31,116 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-16 15:53:31,116 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-16 15:53:31,117 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-16 15:53:31,117 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-16 15:53:31,117 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-16 15:53:31,118 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-16 15:53:31,118 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-16 15:53:31,118 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-16 15:53:31,118 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-16 15:53:31,118 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-16 15:53:31,119 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-16 15:53:31,119 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-16 15:53:31,119 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_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 0b362a98d328467ff4a069dbed2be3429090ca070e60d49c76297e4bb94402b7 [2022-11-16 15:53:31,406 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-16 15:53:31,435 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-16 15:53:31,438 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-16 15:53:31,439 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-16 15:53:31,440 INFO L275 PluginConnector]: CDTParser initialized [2022-11-16 15:53:31,441 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/../../sv-benchmarks/c/loop-invgen/half_2.i [2022-11-16 15:53:31,501 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/data/46144832b/3095e204d9a34eb98078effb9b36065b/FLAG0b2b64977 [2022-11-16 15:53:32,065 INFO L306 CDTParser]: Found 1 translation units. [2022-11-16 15:53:32,065 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/sv-benchmarks/c/loop-invgen/half_2.i [2022-11-16 15:53:32,072 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/data/46144832b/3095e204d9a34eb98078effb9b36065b/FLAG0b2b64977 [2022-11-16 15:53:32,521 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/data/46144832b/3095e204d9a34eb98078effb9b36065b [2022-11-16 15:53:32,524 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-16 15:53:32,525 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-16 15:53:32,527 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-16 15:53:32,527 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-16 15:53:32,531 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-16 15:53:32,532 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.11 03:53:32" (1/1) ... [2022-11-16 15:53:32,533 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@250c31e8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 03:53:32, skipping insertion in model container [2022-11-16 15:53:32,533 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.11 03:53:32" (1/1) ... [2022-11-16 15:53:32,540 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-16 15:53:32,554 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-16 15:53:32,752 WARN L229 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/sv-benchmarks/c/loop-invgen/half_2.i[893,906] [2022-11-16 15:53:32,771 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-16 15:53:32,779 INFO L203 MainTranslator]: Completed pre-run [2022-11-16 15:53:32,797 WARN L229 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/sv-benchmarks/c/loop-invgen/half_2.i[893,906] [2022-11-16 15:53:32,807 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-16 15:53:32,822 INFO L208 MainTranslator]: Completed translation [2022-11-16 15:53:32,823 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 03:53:32 WrapperNode [2022-11-16 15:53:32,823 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-16 15:53:32,824 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-16 15:53:32,825 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-16 15:53:32,825 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-16 15:53:32,833 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 03:53:32" (1/1) ... [2022-11-16 15:53:32,841 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 03:53:32" (1/1) ... [2022-11-16 15:53:32,861 INFO L138 Inliner]: procedures = 16, calls = 7, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 48 [2022-11-16 15:53:32,862 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-16 15:53:32,863 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-16 15:53:32,863 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-16 15:53:32,863 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-16 15:53:32,872 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 03:53:32" (1/1) ... [2022-11-16 15:53:32,872 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 03:53:32" (1/1) ... [2022-11-16 15:53:32,874 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 03:53:32" (1/1) ... [2022-11-16 15:53:32,875 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 03:53:32" (1/1) ... [2022-11-16 15:53:32,883 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 03:53:32" (1/1) ... [2022-11-16 15:53:32,889 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 03:53:32" (1/1) ... [2022-11-16 15:53:32,896 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 03:53:32" (1/1) ... [2022-11-16 15:53:32,897 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 03:53:32" (1/1) ... [2022-11-16 15:53:32,900 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-16 15:53:32,901 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-16 15:53:32,901 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-16 15:53:32,901 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-16 15:53:32,902 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 03:53:32" (1/1) ... [2022-11-16 15:53:32,909 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-16 15:53:32,919 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 15:53:32,933 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-16 15:53:32,963 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-16 15:53:32,978 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-16 15:53:32,978 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-16 15:53:32,978 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-16 15:53:32,979 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-16 15:53:33,051 INFO L235 CfgBuilder]: Building ICFG [2022-11-16 15:53:33,053 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-16 15:53:33,219 INFO L276 CfgBuilder]: Performing block encoding [2022-11-16 15:53:33,265 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-16 15:53:33,265 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-11-16 15:53:33,268 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.11 03:53:33 BoogieIcfgContainer [2022-11-16 15:53:33,268 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-16 15:53:33,270 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-16 15:53:33,270 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-16 15:53:33,279 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-16 15:53:33,279 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 16.11 03:53:32" (1/3) ... [2022-11-16 15:53:33,280 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15dd542d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.11 03:53:33, skipping insertion in model container [2022-11-16 15:53:33,280 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 03:53:32" (2/3) ... [2022-11-16 15:53:33,281 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15dd542d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.11 03:53:33, skipping insertion in model container [2022-11-16 15:53:33,281 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.11 03:53:33" (3/3) ... [2022-11-16 15:53:33,282 INFO L112 eAbstractionObserver]: Analyzing ICFG half_2.i [2022-11-16 15:53:33,313 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-16 15:53:33,313 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-16 15:53:33,385 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-16 15:53:33,401 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;@184b9dc9, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-16 15:53:33,401 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-16 15:53:33,406 INFO L276 IsEmpty]: Start isEmpty. Operand has 10 states, 8 states have (on average 1.625) internal successors, (13), 9 states have internal predecessors, (13), 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) [2022-11-16 15:53:33,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-16 15:53:33,415 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 15:53:33,416 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-16 15:53:33,416 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 15:53:33,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 15:53:33,429 INFO L85 PathProgramCache]: Analyzing trace with hash -2025251484, now seen corresponding path program 1 times [2022-11-16 15:53:33,439 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 15:53:33,442 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [57639479] [2022-11-16 15:53:33,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 15:53:33,443 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 15:53:33,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:53:33,875 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:53:33,876 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 15:53:33,876 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [57639479] [2022-11-16 15:53:33,877 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [57639479] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 15:53:33,877 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 15:53:33,877 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-16 15:53:33,879 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [192868046] [2022-11-16 15:53:33,880 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 15:53:33,884 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-16 15:53:33,884 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 15:53:33,916 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-16 15:53:33,918 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-16 15:53:33,920 INFO L87 Difference]: Start difference. First operand has 10 states, 8 states have (on average 1.625) internal successors, (13), 9 states have internal predecessors, (13), 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 5 states, 5 states have (on average 1.2) internal successors, (6), 5 states have internal predecessors, (6), 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) [2022-11-16 15:53:34,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 15:53:34,027 INFO L93 Difference]: Finished difference Result 26 states and 32 transitions. [2022-11-16 15:53:34,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-16 15:53:34,030 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 5 states have internal predecessors, (6), 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 6 [2022-11-16 15:53:34,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 15:53:34,039 INFO L225 Difference]: With dead ends: 26 [2022-11-16 15:53:34,039 INFO L226 Difference]: Without dead ends: 13 [2022-11-16 15:53:34,042 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2022-11-16 15:53:34,050 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 14 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 15:53:34,052 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 11 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 15:53:34,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2022-11-16 15:53:34,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 11. [2022-11-16 15:53:34,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.3) internal successors, (13), 10 states have internal predecessors, (13), 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) [2022-11-16 15:53:34,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 13 transitions. [2022-11-16 15:53:34,099 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 13 transitions. Word has length 6 [2022-11-16 15:53:34,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 15:53:34,100 INFO L495 AbstractCegarLoop]: Abstraction has 11 states and 13 transitions. [2022-11-16 15:53:34,102 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 5 states have internal predecessors, (6), 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) [2022-11-16 15:53:34,102 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 13 transitions. [2022-11-16 15:53:34,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-16 15:53:34,103 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 15:53:34,103 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-16 15:53:34,104 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-16 15:53:34,105 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 15:53:34,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 15:53:34,107 INFO L85 PathProgramCache]: Analyzing trace with hash 1610042692, now seen corresponding path program 1 times [2022-11-16 15:53:34,108 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 15:53:34,108 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1507347929] [2022-11-16 15:53:34,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 15:53:34,109 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 15:53:34,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:53:34,354 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:53:34,354 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 15:53:34,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1507347929] [2022-11-16 15:53:34,355 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1507347929] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 15:53:34,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [480670341] [2022-11-16 15:53:34,355 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 15:53:34,356 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:53:34,356 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 15:53:34,369 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 15:53:34,391 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-16 15:53:34,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:53:34,441 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-16 15:53:34,445 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 15:53:34,645 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:53:34,645 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 15:53:34,931 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:53:34,931 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [480670341] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 15:53:34,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1767875640] [2022-11-16 15:53:34,950 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-11-16 15:53:34,950 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 15:53:34,954 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 15:53:34,959 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 15:53:34,960 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 15:53:35,132 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 15:53:35,414 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '123#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (= |ULTIMATE.start_main_~j~0#1| 0) (not (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 15:53:35,414 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 15:53:35,414 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 15:53:35,414 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2022-11-16 15:53:35,415 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1079554149] [2022-11-16 15:53:35,415 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 15:53:35,416 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-16 15:53:35,416 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 15:53:35,417 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-16 15:53:35,418 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=218, Unknown=0, NotChecked=0, Total=272 [2022-11-16 15:53:35,418 INFO L87 Difference]: Start difference. First operand 11 states and 13 transitions. Second operand has 12 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 states have internal predecessors, (16), 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) [2022-11-16 15:53:35,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 15:53:35,942 INFO L93 Difference]: Finished difference Result 36 states and 42 transitions. [2022-11-16 15:53:35,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-16 15:53:35,943 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 states have internal predecessors, (16), 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 7 [2022-11-16 15:53:35,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 15:53:35,944 INFO L225 Difference]: With dead ends: 36 [2022-11-16 15:53:35,944 INFO L226 Difference]: Without dead ends: 34 [2022-11-16 15:53:35,945 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 175 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=159, Invalid=653, Unknown=0, NotChecked=0, Total=812 [2022-11-16 15:53:35,947 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 55 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 15:53:35,947 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [55 Valid, 26 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 15:53:35,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-11-16 15:53:35,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 16. [2022-11-16 15:53:35,955 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) [2022-11-16 15:53:35,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2022-11-16 15:53:35,956 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 7 [2022-11-16 15:53:35,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 15:53:35,956 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2022-11-16 15:53:35,957 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 states have internal predecessors, (16), 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) [2022-11-16 15:53:35,957 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2022-11-16 15:53:35,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-16 15:53:35,957 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 15:53:35,958 INFO L195 NwaCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1] [2022-11-16 15:53:35,968 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-16 15:53:36,163 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:53:36,164 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 15:53:36,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 15:53:36,164 INFO L85 PathProgramCache]: Analyzing trace with hash 49336644, now seen corresponding path program 2 times [2022-11-16 15:53:36,164 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 15:53:36,164 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [828725220] [2022-11-16 15:53:36,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 15:53:36,165 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 15:53:36,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:53:36,277 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:53:36,278 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 15:53:36,282 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [828725220] [2022-11-16 15:53:36,283 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [828725220] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 15:53:36,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1315394309] [2022-11-16 15:53:36,283 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 15:53:36,284 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:53:36,284 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 15:53:36,288 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 15:53:36,299 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-16 15:53:36,341 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-16 15:53:36,341 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 15:53:36,343 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-16 15:53:36,344 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 15:53:36,438 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:53:36,439 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 15:53:36,546 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:53:36,547 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1315394309] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 15:53:36,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1246848223] [2022-11-16 15:53:36,558 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-11-16 15:53:36,558 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 15:53:36,558 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 15:53:36,559 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 15:53:36,559 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 15:53:36,700 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 15:53:36,977 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '295#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (= |ULTIMATE.start_main_~j~0#1| 0) (not (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 15:53:36,977 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 15:53:36,977 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 15:53:36,978 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 15 [2022-11-16 15:53:36,978 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1276858355] [2022-11-16 15:53:36,978 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 15:53:36,978 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-16 15:53:36,978 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 15:53:36,979 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-16 15:53:36,979 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=304, Unknown=0, NotChecked=0, Total=380 [2022-11-16 15:53:36,979 INFO L87 Difference]: Start difference. First operand 16 states and 20 transitions. Second operand has 15 states, 15 states have (on average 1.4) internal successors, (21), 15 states have internal predecessors, (21), 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) [2022-11-16 15:53:37,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 15:53:37,451 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2022-11-16 15:53:37,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-16 15:53:37,452 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.4) internal successors, (21), 15 states have internal predecessors, (21), 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 [2022-11-16 15:53:37,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 15:53:37,452 INFO L225 Difference]: With dead ends: 46 [2022-11-16 15:53:37,453 INFO L226 Difference]: Without dead ends: 44 [2022-11-16 15:53:37,454 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=237, Invalid=885, Unknown=0, NotChecked=0, Total=1122 [2022-11-16 15:53:37,457 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 53 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 177 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 197 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 177 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-16 15:53:37,458 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [53 Valid, 54 Invalid, 197 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 177 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-16 15:53:37,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-11-16 15:53:37,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 16. [2022-11-16 15:53:37,472 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) [2022-11-16 15:53:37,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2022-11-16 15:53:37,473 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 9 [2022-11-16 15:53:37,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 15:53:37,474 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2022-11-16 15:53:37,474 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.4) internal successors, (21), 15 states have internal predecessors, (21), 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) [2022-11-16 15:53:37,474 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2022-11-16 15:53:37,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-16 15:53:37,475 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 15:53:37,475 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 15:53:37,485 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-16 15:53:37,680 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2022-11-16 15:53:37,680 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 15:53:37,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 15:53:37,681 INFO L85 PathProgramCache]: Analyzing trace with hash 1438439610, now seen corresponding path program 1 times [2022-11-16 15:53:37,681 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 15:53:37,681 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1442373437] [2022-11-16 15:53:37,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 15:53:37,682 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 15:53:37,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:53:37,801 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:53:37,801 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 15:53:37,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1442373437] [2022-11-16 15:53:37,802 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1442373437] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 15:53:37,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [11329276] [2022-11-16 15:53:37,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 15:53:37,803 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:53:37,803 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 15:53:37,804 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 15:53:37,813 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-16 15:53:37,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:53:37,855 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-16 15:53:37,856 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 15:53:37,895 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:53:37,895 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-16 15:53:37,896 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [11329276] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 15:53:37,897 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-16 15:53:37,897 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2022-11-16 15:53:37,897 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1600694209] [2022-11-16 15:53:37,897 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 15:53:37,898 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-16 15:53:37,900 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 15:53:37,901 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-16 15:53:37,901 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2022-11-16 15:53:37,901 INFO L87 Difference]: Start difference. First operand 16 states and 20 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 5 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) [2022-11-16 15:53:37,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 15:53:37,950 INFO L93 Difference]: Finished difference Result 23 states and 27 transitions. [2022-11-16 15:53:37,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-16 15:53:37,951 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 5 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 [2022-11-16 15:53:37,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 15:53:37,957 INFO L225 Difference]: With dead ends: 23 [2022-11-16 15:53:37,957 INFO L226 Difference]: Without dead ends: 16 [2022-11-16 15:53:37,958 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2022-11-16 15:53:37,962 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 4 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-16 15:53:37,963 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 13 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-16 15:53:37,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-11-16 15:53:37,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2022-11-16 15:53:37,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 15 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) [2022-11-16 15:53:37,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2022-11-16 15:53:37,978 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 9 [2022-11-16 15:53:37,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 15:53:37,978 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2022-11-16 15:53:37,978 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 5 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) [2022-11-16 15:53:37,979 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2022-11-16 15:53:37,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-16 15:53:37,979 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 15:53:37,980 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 15:53:37,987 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-16 15:53:38,184 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:53:38,185 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 15:53:38,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 15:53:38,186 INFO L85 PathProgramCache]: Analyzing trace with hash 543513786, now seen corresponding path program 1 times [2022-11-16 15:53:38,186 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 15:53:38,186 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1439080130] [2022-11-16 15:53:38,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 15:53:38,186 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 15:53:38,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:53:38,436 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:53:38,437 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 15:53:38,437 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1439080130] [2022-11-16 15:53:38,437 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1439080130] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 15:53:38,437 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [652036452] [2022-11-16 15:53:38,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 15:53:38,437 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:53:38,438 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 15:53:38,439 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 15:53:38,466 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-16 15:53:38,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:53:38,490 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-16 15:53:38,491 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 15:53:38,644 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:53:38,645 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 15:53:38,919 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:53:38,920 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [652036452] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 15:53:38,920 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [999865052] [2022-11-16 15:53:38,924 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 15:53:38,924 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 15:53:38,924 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 15:53:38,925 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 15:53:38,925 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 15:53:39,098 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 15:53:39,511 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '598#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 15:53:39,512 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 15:53:39,512 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 15:53:39,512 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 18 [2022-11-16 15:53:39,512 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1542408888] [2022-11-16 15:53:39,512 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 15:53:39,513 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-16 15:53:39,513 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 15:53:39,513 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-16 15:53:39,514 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=465, Unknown=0, NotChecked=0, Total=552 [2022-11-16 15:53:39,514 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand has 18 states, 18 states have (on average 1.5) internal successors, (27), 18 states have internal predecessors, (27), 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) [2022-11-16 15:53:40,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 15:53:40,249 INFO L93 Difference]: Finished difference Result 42 states and 48 transitions. [2022-11-16 15:53:40,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-16 15:53:40,249 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.5) internal successors, (27), 18 states have internal predecessors, (27), 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 11 [2022-11-16 15:53:40,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 15:53:40,250 INFO L225 Difference]: With dead ends: 42 [2022-11-16 15:53:40,250 INFO L226 Difference]: Without dead ends: 25 [2022-11-16 15:53:40,251 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=249, Invalid=1233, Unknown=0, NotChecked=0, Total=1482 [2022-11-16 15:53:40,251 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 62 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 154 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 184 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 154 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-16 15:53:40,252 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [62 Valid, 25 Invalid, 184 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 154 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-16 15:53:40,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-11-16 15:53:40,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 16. [2022-11-16 15:53:40,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 15 states have internal predecessors, (17), 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) [2022-11-16 15:53:40,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2022-11-16 15:53:40,262 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 11 [2022-11-16 15:53:40,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 15:53:40,263 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2022-11-16 15:53:40,263 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.5) internal successors, (27), 18 states have internal predecessors, (27), 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) [2022-11-16 15:53:40,263 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2022-11-16 15:53:40,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-16 15:53:40,264 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 15:53:40,264 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1] [2022-11-16 15:53:40,276 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-11-16 15:53:40,469 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:53:40,469 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 15:53:40,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 15:53:40,470 INFO L85 PathProgramCache]: Analyzing trace with hash -1965317756, now seen corresponding path program 2 times [2022-11-16 15:53:40,470 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 15:53:40,470 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2055911778] [2022-11-16 15:53:40,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 15:53:40,470 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 15:53:40,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:53:40,801 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:53:40,801 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 15:53:40,801 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2055911778] [2022-11-16 15:53:40,801 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2055911778] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 15:53:40,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1921852816] [2022-11-16 15:53:40,802 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 15:53:40,802 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:53:40,802 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 15:53:40,803 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 15:53:40,807 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-16 15:53:40,850 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-16 15:53:40,850 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 15:53:40,851 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-16 15:53:40,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 15:53:41,100 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:53:41,101 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 15:53:41,460 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:53:41,461 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1921852816] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 15:53:41,461 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1562240006] [2022-11-16 15:53:41,463 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 15:53:41,463 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 15:53:41,463 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 15:53:41,464 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 15:53:41,464 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 15:53:41,605 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 15:53:42,065 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '837#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 15:53:42,065 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 15:53:42,065 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 15:53:42,065 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 26 [2022-11-16 15:53:42,066 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [471732976] [2022-11-16 15:53:42,066 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 15:53:42,066 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-16 15:53:42,066 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 15:53:42,067 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-16 15:53:42,067 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=861, Unknown=0, NotChecked=0, Total=992 [2022-11-16 15:53:42,067 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 26 states, 26 states have (on average 1.5384615384615385) internal successors, (40), 26 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) [2022-11-16 15:53:42,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 15:53:42,497 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2022-11-16 15:53:42,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-16 15:53:42,498 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.5384615384615385) internal successors, (40), 26 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 15 [2022-11-16 15:53:42,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 15:53:42,499 INFO L225 Difference]: With dead ends: 32 [2022-11-16 15:53:42,499 INFO L226 Difference]: Without dead ends: 18 [2022-11-16 15:53:42,500 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 358 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=209, Invalid=1351, Unknown=0, NotChecked=0, Total=1560 [2022-11-16 15:53:42,502 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 28 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 202 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 225 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 202 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-16 15:53:42,502 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 37 Invalid, 225 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 202 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-16 15:53:42,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-11-16 15:53:42,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2022-11-16 15:53:42,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.125) internal successors, (18), 16 states have internal predecessors, (18), 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) [2022-11-16 15:53:42,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2022-11-16 15:53:42,510 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 15 [2022-11-16 15:53:42,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 15:53:42,510 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2022-11-16 15:53:42,510 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.5384615384615385) internal successors, (40), 26 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) [2022-11-16 15:53:42,511 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2022-11-16 15:53:42,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-11-16 15:53:42,511 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 15:53:42,511 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 2, 2, 1, 1, 1, 1, 1] [2022-11-16 15:53:42,523 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-16 15:53:42,723 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:53:42,724 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 15:53:42,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 15:53:42,724 INFO L85 PathProgramCache]: Analyzing trace with hash -772452956, now seen corresponding path program 3 times [2022-11-16 15:53:42,725 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 15:53:42,725 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1831454599] [2022-11-16 15:53:42,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 15:53:42,725 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 15:53:42,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:53:42,866 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 3 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:53:42,867 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 15:53:42,867 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1831454599] [2022-11-16 15:53:42,867 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1831454599] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 15:53:42,867 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1426705323] [2022-11-16 15:53:42,867 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 15:53:42,868 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:53:42,868 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 15:53:42,869 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 15:53:42,895 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-16 15:53:42,928 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 15:53:42,928 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 15:53:42,929 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-16 15:53:42,930 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 15:53:43,040 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:53:43,040 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 15:53:43,162 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:53:43,162 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1426705323] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 15:53:43,162 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [197783279] [2022-11-16 15:53:43,166 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 15:53:43,167 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 15:53:43,167 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 15:53:43,167 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 15:53:43,167 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 15:53:43,290 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 15:53:43,672 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1046#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 15:53:43,672 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 15:53:43,672 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 15:53:43,673 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 19 [2022-11-16 15:53:43,673 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1345985032] [2022-11-16 15:53:43,673 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 15:53:43,673 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-16 15:53:43,674 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 15:53:43,674 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-16 15:53:43,674 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=507, Unknown=0, NotChecked=0, Total=600 [2022-11-16 15:53:43,675 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 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) [2022-11-16 15:53:43,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 15:53:43,896 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2022-11-16 15:53:43,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-16 15:53:43,896 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 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 16 [2022-11-16 15:53:43,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 15:53:43,897 INFO L225 Difference]: With dead ends: 28 [2022-11-16 15:53:43,897 INFO L226 Difference]: Without dead ends: 26 [2022-11-16 15:53:43,898 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 30 SyntacticMatches, 3 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=179, Invalid=877, Unknown=0, NotChecked=0, Total=1056 [2022-11-16 15:53:43,898 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 48 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 129 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 15:53:43,899 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [48 Valid, 24 Invalid, 129 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 15:53:43,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-11-16 15:53:43,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 20. [2022-11-16 15:53:43,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 states have internal predecessors, (21), 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) [2022-11-16 15:53:43,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2022-11-16 15:53:43,912 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 16 [2022-11-16 15:53:43,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 15:53:43,913 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2022-11-16 15:53:43,913 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 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) [2022-11-16 15:53:43,913 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2022-11-16 15:53:43,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-16 15:53:43,914 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 15:53:43,914 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1] [2022-11-16 15:53:43,924 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-11-16 15:53:44,124 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-11-16 15:53:44,125 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 15:53:44,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 15:53:44,125 INFO L85 PathProgramCache]: Analyzing trace with hash 293585018, now seen corresponding path program 4 times [2022-11-16 15:53:44,125 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 15:53:44,125 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1670514150] [2022-11-16 15:53:44,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 15:53:44,125 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 15:53:44,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:53:44,536 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:53:44,537 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 15:53:44,537 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1670514150] [2022-11-16 15:53:44,537 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1670514150] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 15:53:44,537 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [222840435] [2022-11-16 15:53:44,537 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 15:53:44,537 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:53:44,537 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 15:53:44,539 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 15:53:44,548 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-16 15:53:44,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:53:44,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-16 15:53:44,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 15:53:44,806 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:53:44,806 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 15:53:45,328 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:53:45,328 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [222840435] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 15:53:45,329 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [37811762] [2022-11-16 15:53:45,330 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 15:53:45,330 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 15:53:45,330 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 15:53:45,331 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 15:53:45,331 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 15:53:45,424 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 15:53:45,803 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1279#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 15:53:45,803 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 15:53:45,803 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 15:53:45,804 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 28 [2022-11-16 15:53:45,804 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1016535777] [2022-11-16 15:53:45,804 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 15:53:45,815 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-16 15:53:45,815 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 15:53:45,815 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-16 15:53:45,816 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=968, Unknown=0, NotChecked=0, Total=1122 [2022-11-16 15:53:45,816 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 28 states, 28 states have (on average 1.75) internal successors, (49), 28 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) [2022-11-16 15:53:46,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 15:53:46,933 INFO L93 Difference]: Finished difference Result 55 states and 63 transitions. [2022-11-16 15:53:46,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-11-16 15:53:46,933 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.75) internal successors, (49), 28 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 [2022-11-16 15:53:46,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 15:53:46,937 INFO L225 Difference]: With dead ends: 55 [2022-11-16 15:53:46,937 INFO L226 Difference]: Without dead ends: 38 [2022-11-16 15:53:46,943 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 674 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=401, Invalid=2461, Unknown=0, NotChecked=0, Total=2862 [2022-11-16 15:53:46,944 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 73 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 307 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 356 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 307 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-16 15:53:46,944 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [73 Valid, 46 Invalid, 356 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 307 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-16 15:53:46,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-11-16 15:53:46,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 28. [2022-11-16 15:53:46,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.2222222222222223) internal successors, (33), 27 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) [2022-11-16 15:53:46,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 33 transitions. [2022-11-16 15:53:46,974 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 33 transitions. Word has length 19 [2022-11-16 15:53:46,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 15:53:46,974 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 33 transitions. [2022-11-16 15:53:46,975 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.75) internal successors, (49), 28 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) [2022-11-16 15:53:46,975 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 33 transitions. [2022-11-16 15:53:46,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-16 15:53:46,976 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 15:53:46,977 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 1, 1, 1, 1, 1] [2022-11-16 15:53:46,983 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-16 15:53:47,181 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2022-11-16 15:53:47,182 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 15:53:47,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 15:53:47,182 INFO L85 PathProgramCache]: Analyzing trace with hash -486816316, now seen corresponding path program 5 times [2022-11-16 15:53:47,182 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 15:53:47,182 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [445381276] [2022-11-16 15:53:47,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 15:53:47,183 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 15:53:47,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:53:47,686 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 12 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:53:47,686 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 15:53:47,686 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [445381276] [2022-11-16 15:53:47,687 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [445381276] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 15:53:47,687 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [780781217] [2022-11-16 15:53:47,687 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 15:53:47,687 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:53:47,687 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 15:53:47,690 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 15:53:47,715 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-16 15:53:47,747 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-16 15:53:47,747 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 15:53:47,749 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 29 conjunts are in the unsatisfiable core [2022-11-16 15:53:47,750 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 15:53:48,258 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:53:48,258 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 15:53:49,066 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:53:49,067 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [780781217] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 15:53:49,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1581946369] [2022-11-16 15:53:49,068 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 15:53:49,069 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 15:53:49,069 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 15:53:49,069 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 15:53:49,069 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 15:53:49,177 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 15:53:49,690 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1637#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 15:53:49,690 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 15:53:49,690 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 15:53:49,690 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 16, 16] total 42 [2022-11-16 15:53:49,690 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1811219093] [2022-11-16 15:53:49,691 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 15:53:49,691 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-11-16 15:53:49,691 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 15:53:49,692 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-11-16 15:53:49,692 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=270, Invalid=1986, Unknown=0, NotChecked=0, Total=2256 [2022-11-16 15:53:49,693 INFO L87 Difference]: Start difference. First operand 28 states and 33 transitions. Second operand has 42 states, 42 states have (on average 1.5238095238095237) internal successors, (64), 42 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) [2022-11-16 15:53:50,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 15:53:50,637 INFO L93 Difference]: Finished difference Result 51 states and 57 transitions. [2022-11-16 15:53:50,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-16 15:53:50,637 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.5238095238095237) internal successors, (64), 42 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 23 [2022-11-16 15:53:50,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 15:53:50,638 INFO L225 Difference]: With dead ends: 51 [2022-11-16 15:53:50,638 INFO L226 Difference]: Without dead ends: 31 [2022-11-16 15:53:50,639 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 975 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=473, Invalid=3309, Unknown=0, NotChecked=0, Total=3782 [2022-11-16 15:53:50,640 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 48 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 362 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 409 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 362 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-16 15:53:50,640 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [48 Valid, 40 Invalid, 409 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 362 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-16 15:53:50,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-11-16 15:53:50,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2022-11-16 15:53:50,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.1851851851851851) internal successors, (32), 27 states have internal predecessors, (32), 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) [2022-11-16 15:53:50,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2022-11-16 15:53:50,655 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 23 [2022-11-16 15:53:50,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 15:53:50,656 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2022-11-16 15:53:50,656 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 1.5238095238095237) internal successors, (64), 42 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) [2022-11-16 15:53:50,656 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2022-11-16 15:53:50,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-16 15:53:50,657 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 15:53:50,657 INFO L195 NwaCegarLoop]: trace histogram [9, 4, 3, 3, 1, 1, 1, 1, 1] [2022-11-16 15:53:50,662 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-16 15:53:50,862 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-11-16 15:53:50,862 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 15:53:50,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 15:53:50,863 INFO L85 PathProgramCache]: Analyzing trace with hash -711895910, now seen corresponding path program 6 times [2022-11-16 15:53:50,863 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 15:53:50,863 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1890737957] [2022-11-16 15:53:50,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 15:53:50,864 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 15:53:50,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:53:51,155 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 28 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:53:51,155 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 15:53:51,155 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1890737957] [2022-11-16 15:53:51,155 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1890737957] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 15:53:51,155 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [255503840] [2022-11-16 15:53:51,156 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 15:53:51,156 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:53:51,156 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 15:53:51,157 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 15:53:51,187 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-16 15:53:51,220 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 15:53:51,221 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 15:53:51,222 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 29 conjunts are in the unsatisfiable core [2022-11-16 15:53:51,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 15:53:51,478 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:53:51,479 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 15:53:51,789 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:53:51,789 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [255503840] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 15:53:51,789 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2145621182] [2022-11-16 15:53:51,791 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 15:53:51,791 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 15:53:51,791 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 15:53:51,791 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 15:53:51,791 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 15:53:51,921 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 15:53:52,392 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1979#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 15:53:52,392 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 15:53:52,392 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 15:53:52,392 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 39 [2022-11-16 15:53:52,392 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1591597802] [2022-11-16 15:53:52,393 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 15:53:52,393 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-11-16 15:53:52,393 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 15:53:52,394 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-11-16 15:53:52,394 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=345, Invalid=1635, Unknown=0, NotChecked=0, Total=1980 [2022-11-16 15:53:52,395 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand has 39 states, 39 states have (on average 1.4615384615384615) internal successors, (57), 39 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) [2022-11-16 15:53:53,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 15:53:53,425 INFO L93 Difference]: Finished difference Result 97 states and 108 transitions. [2022-11-16 15:53:53,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-11-16 15:53:53,426 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.4615384615384615) internal successors, (57), 39 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) Word has length 24 [2022-11-16 15:53:53,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 15:53:53,427 INFO L225 Difference]: With dead ends: 97 [2022-11-16 15:53:53,427 INFO L226 Difference]: Without dead ends: 95 [2022-11-16 15:53:53,428 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1633 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1185, Invalid=4365, Unknown=0, NotChecked=0, Total=5550 [2022-11-16 15:53:53,429 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 164 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 462 mSolverCounterSat, 82 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 164 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 544 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 82 IncrementalHoareTripleChecker+Valid, 462 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-16 15:53:53,429 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [164 Valid, 54 Invalid, 544 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [82 Valid, 462 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-16 15:53:53,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2022-11-16 15:53:53,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 40. [2022-11-16 15:53:53,468 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) [2022-11-16 15:53:53,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 44 transitions. [2022-11-16 15:53:53,470 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 44 transitions. Word has length 24 [2022-11-16 15:53:53,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 15:53:53,472 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 44 transitions. [2022-11-16 15:53:53,472 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.4615384615384615) internal successors, (57), 39 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) [2022-11-16 15:53:53,472 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 44 transitions. [2022-11-16 15:53:53,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-11-16 15:53:53,473 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 15:53:53,473 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 5, 1, 1, 1, 1, 1] [2022-11-16 15:53:53,479 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-16 15:53:53,683 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-16 15:53:53,683 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 15:53:53,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 15:53:53,684 INFO L85 PathProgramCache]: Analyzing trace with hash 569136186, now seen corresponding path program 7 times [2022-11-16 15:53:53,684 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 15:53:53,684 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [371609785] [2022-11-16 15:53:53,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 15:53:53,684 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 15:53:53,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:53:54,241 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 22 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:53:54,242 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 15:53:54,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [371609785] [2022-11-16 15:53:54,242 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [371609785] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 15:53:54,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1375334130] [2022-11-16 15:53:54,242 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 15:53:54,242 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:53:54,242 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 15:53:54,248 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 15:53:54,256 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-16 15:53:54,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:53:54,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-16 15:53:54,306 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 15:53:54,639 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:53:54,639 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 15:53:55,417 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:53:55,418 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1375334130] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 15:53:55,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [761671428] [2022-11-16 15:53:55,420 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 15:53:55,420 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 15:53:55,420 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 15:53:55,420 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 15:53:55,420 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 15:53:55,523 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 15:53:55,976 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2464#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 15:53:55,977 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 15:53:55,977 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 15:53:55,977 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 38 [2022-11-16 15:53:55,977 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [578941887] [2022-11-16 15:53:55,977 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 15:53:55,978 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-11-16 15:53:55,978 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 15:53:55,978 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-11-16 15:53:55,979 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=249, Invalid=1643, Unknown=0, NotChecked=0, Total=1892 [2022-11-16 15:53:55,979 INFO L87 Difference]: Start difference. First operand 40 states and 44 transitions. Second operand has 38 states, 38 states have (on average 1.868421052631579) internal successors, (71), 38 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) [2022-11-16 15:53:57,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 15:53:57,921 INFO L93 Difference]: Finished difference Result 124 states and 133 transitions. [2022-11-16 15:53:57,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-11-16 15:53:57,921 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.868421052631579) internal successors, (71), 38 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) Word has length 27 [2022-11-16 15:53:57,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 15:53:57,922 INFO L225 Difference]: With dead ends: 124 [2022-11-16 15:53:57,922 INFO L226 Difference]: Without dead ends: 101 [2022-11-16 15:53:57,924 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1265 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=686, Invalid=4426, Unknown=0, NotChecked=0, Total=5112 [2022-11-16 15:53:57,924 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 107 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 508 mSolverCounterSat, 77 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 585 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 77 IncrementalHoareTripleChecker+Valid, 508 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-16 15:53:57,924 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [107 Valid, 67 Invalid, 585 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [77 Valid, 508 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-16 15:53:57,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-11-16 15:53:57,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 40. [2022-11-16 15:53:57,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.1025641025641026) internal successors, (43), 39 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) [2022-11-16 15:53:57,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2022-11-16 15:53:57,945 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 27 [2022-11-16 15:53:57,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 15:53:57,946 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2022-11-16 15:53:57,946 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.868421052631579) internal successors, (71), 38 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) [2022-11-16 15:53:57,946 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2022-11-16 15:53:57,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-11-16 15:53:57,947 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 15:53:57,947 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 6, 6, 1, 1, 1, 1, 1] [2022-11-16 15:53:57,951 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-16 15:53:58,147 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-16 15:53:58,148 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 15:53:58,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 15:53:58,148 INFO L85 PathProgramCache]: Analyzing trace with hash 1681635844, now seen corresponding path program 8 times [2022-11-16 15:53:58,148 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 15:53:58,148 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1710659473] [2022-11-16 15:53:58,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 15:53:58,148 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 15:53:58,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:53:58,813 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 35 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:53:58,813 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 15:53:58,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1710659473] [2022-11-16 15:53:58,813 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1710659473] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 15:53:58,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1474622714] [2022-11-16 15:53:58,813 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 15:53:58,814 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:53:58,814 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 15:53:58,815 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 15:53:58,817 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-16 15:53:58,908 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-11-16 15:53:58,908 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 15:53:58,910 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 35 conjunts are in the unsatisfiable core [2022-11-16 15:53:58,912 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 15:53:59,644 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:53:59,644 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 15:54:00,769 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:54:00,769 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1474622714] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 15:54:00,769 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1147599477] [2022-11-16 15:54:00,771 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 15:54:00,771 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 15:54:00,771 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 15:54:00,772 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 15:54:00,772 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 15:54:00,866 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 15:54:01,366 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3035#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 15:54:01,367 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 15:54:01,367 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 15:54:01,367 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 20, 20] total 54 [2022-11-16 15:54:01,367 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [310649672] [2022-11-16 15:54:01,367 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 15:54:01,367 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-11-16 15:54:01,368 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 15:54:01,368 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-11-16 15:54:01,369 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=404, Invalid=3136, Unknown=0, NotChecked=0, Total=3540 [2022-11-16 15:54:01,369 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand has 54 states, 54 states have (on average 1.6296296296296295) internal successors, (88), 54 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) [2022-11-16 15:54:02,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 15:54:02,971 INFO L93 Difference]: Finished difference Result 69 states and 73 transitions. [2022-11-16 15:54:02,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-11-16 15:54:02,971 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 1.6296296296296295) internal successors, (88), 54 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 31 [2022-11-16 15:54:02,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 15:54:02,972 INFO L225 Difference]: With dead ends: 69 [2022-11-16 15:54:02,972 INFO L226 Difference]: Without dead ends: 43 [2022-11-16 15:54:02,975 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1569 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=715, Invalid=5291, Unknown=0, NotChecked=0, Total=6006 [2022-11-16 15:54:02,975 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 79 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 631 mSolverCounterSat, 84 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 715 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 84 IncrementalHoareTripleChecker+Valid, 631 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-16 15:54:02,976 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [79 Valid, 60 Invalid, 715 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [84 Valid, 631 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-16 15:54:02,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-11-16 15:54:02,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 40. [2022-11-16 15:54:02,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.0769230769230769) internal successors, (42), 39 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) [2022-11-16 15:54:02,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2022-11-16 15:54:02,996 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 31 [2022-11-16 15:54:02,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 15:54:02,996 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2022-11-16 15:54:02,996 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 1.6296296296296295) internal successors, (88), 54 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) [2022-11-16 15:54:02,996 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2022-11-16 15:54:02,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-11-16 15:54:02,997 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 15:54:02,997 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 7, 7, 1, 1, 1, 1, 1] [2022-11-16 15:54:03,002 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-16 15:54:03,202 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-16 15:54:03,202 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 15:54:03,202 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 15:54:03,202 INFO L85 PathProgramCache]: Analyzing trace with hash 994514938, now seen corresponding path program 9 times [2022-11-16 15:54:03,202 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 15:54:03,203 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1543544906] [2022-11-16 15:54:03,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 15:54:03,203 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 15:54:03,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:54:03,980 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 51 proven. 62 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:54:03,980 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 15:54:03,980 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1543544906] [2022-11-16 15:54:03,981 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1543544906] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 15:54:03,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1177273508] [2022-11-16 15:54:03,981 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 15:54:03,981 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:54:03,981 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 15:54:03,982 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 15:54:03,984 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-16 15:54:04,043 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 15:54:04,043 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 15:54:04,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 40 conjunts are in the unsatisfiable core [2022-11-16 15:54:04,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 15:54:04,500 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 0 proven. 113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:54:04,500 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 15:54:05,666 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 0 proven. 113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:54:05,666 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1177273508] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 15:54:05,666 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1281437090] [2022-11-16 15:54:05,668 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 15:54:05,668 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 15:54:05,668 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 15:54:05,669 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 15:54:05,669 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 15:54:05,786 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 15:54:06,390 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3510#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 15:54:06,390 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 15:54:06,391 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 15:54:06,391 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20] total 48 [2022-11-16 15:54:06,391 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1115163149] [2022-11-16 15:54:06,391 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 15:54:06,392 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-11-16 15:54:06,392 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 15:54:06,392 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-11-16 15:54:06,393 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=372, Invalid=2490, Unknown=0, NotChecked=0, Total=2862 [2022-11-16 15:54:06,394 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand has 48 states, 48 states have (on average 1.9375) internal successors, (93), 48 states have internal predecessors, (93), 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) [2022-11-16 15:54:09,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 15:54:09,314 INFO L93 Difference]: Finished difference Result 102 states and 113 transitions. [2022-11-16 15:54:09,314 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-11-16 15:54:09,314 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 1.9375) internal successors, (93), 48 states have internal predecessors, (93), 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 [2022-11-16 15:54:09,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 15:54:09,315 INFO L225 Difference]: With dead ends: 102 [2022-11-16 15:54:09,315 INFO L226 Difference]: Without dead ends: 73 [2022-11-16 15:54:09,316 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2033 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=1055, Invalid=6955, Unknown=0, NotChecked=0, Total=8010 [2022-11-16 15:54:09,317 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 147 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 819 mSolverCounterSat, 126 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 147 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 945 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 126 IncrementalHoareTripleChecker+Valid, 819 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-16 15:54:09,317 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [147 Valid, 98 Invalid, 945 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [126 Valid, 819 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-16 15:54:09,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2022-11-16 15:54:09,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 40. [2022-11-16 15:54:09,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.0512820512820513) internal successors, (41), 39 states have internal predecessors, (41), 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) [2022-11-16 15:54:09,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2022-11-16 15:54:09,341 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 35 [2022-11-16 15:54:09,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 15:54:09,342 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2022-11-16 15:54:09,342 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 1.9375) internal successors, (93), 48 states have internal predecessors, (93), 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) [2022-11-16 15:54:09,342 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2022-11-16 15:54:09,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-11-16 15:54:09,343 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 15:54:09,343 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 8, 8, 1, 1, 1, 1, 1] [2022-11-16 15:54:09,355 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-16 15:54:09,548 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-16 15:54:09,548 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 15:54:09,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 15:54:09,548 INFO L85 PathProgramCache]: Analyzing trace with hash -1887470012, now seen corresponding path program 10 times [2022-11-16 15:54:09,549 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 15:54:09,549 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1392751135] [2022-11-16 15:54:09,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 15:54:09,549 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 15:54:09,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:54:10,498 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 70 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:54:10,498 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 15:54:10,498 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1392751135] [2022-11-16 15:54:10,499 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1392751135] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 15:54:10,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2062964813] [2022-11-16 15:54:10,499 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 15:54:10,499 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:54:10,499 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 15:54:10,500 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 15:54:10,531 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-16 15:54:10,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:54:10,583 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 44 conjunts are in the unsatisfiable core [2022-11-16 15:54:10,585 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 15:54:11,150 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:54:11,150 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 15:54:12,447 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:54:12,447 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2062964813] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 15:54:12,447 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [561899899] [2022-11-16 15:54:12,449 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 15:54:12,450 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 15:54:12,450 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 15:54:12,450 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 15:54:12,450 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 15:54:12,537 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 15:54:13,168 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4108#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 15:54:13,168 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 15:54:13,168 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 15:54:13,168 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 22] total 53 [2022-11-16 15:54:13,169 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1155609838] [2022-11-16 15:54:13,169 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 15:54:13,169 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2022-11-16 15:54:13,169 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 15:54:13,170 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2022-11-16 15:54:13,171 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=444, Invalid=2978, Unknown=0, NotChecked=0, Total=3422 [2022-11-16 15:54:13,171 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand has 53 states, 53 states have (on average 1.9622641509433962) internal successors, (104), 53 states have internal predecessors, (104), 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) [2022-11-16 15:54:16,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 15:54:16,658 INFO L93 Difference]: Finished difference Result 110 states and 123 transitions. [2022-11-16 15:54:16,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-11-16 15:54:16,659 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.9622641509433962) internal successors, (104), 53 states have internal predecessors, (104), 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 [2022-11-16 15:54:16,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 15:54:16,659 INFO L225 Difference]: With dead ends: 110 [2022-11-16 15:54:16,660 INFO L226 Difference]: Without dead ends: 78 [2022-11-16 15:54:16,662 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2483 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=1271, Invalid=8431, Unknown=0, NotChecked=0, Total=9702 [2022-11-16 15:54:16,663 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 166 mSDsluCounter, 116 mSDsCounter, 0 mSdLazyCounter, 982 mSolverCounterSat, 150 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 166 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 1132 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 150 IncrementalHoareTripleChecker+Valid, 982 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-16 15:54:16,663 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [166 Valid, 119 Invalid, 1132 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [150 Valid, 982 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-16 15:54:16,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2022-11-16 15:54:16,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 53. [2022-11-16 15:54:16,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 52 states have (on average 1.2115384615384615) internal successors, (63), 52 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) [2022-11-16 15:54:16,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 63 transitions. [2022-11-16 15:54:16,698 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 63 transitions. Word has length 39 [2022-11-16 15:54:16,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 15:54:16,698 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 63 transitions. [2022-11-16 15:54:16,699 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 1.9622641509433962) internal successors, (104), 53 states have internal predecessors, (104), 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) [2022-11-16 15:54:16,699 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 63 transitions. [2022-11-16 15:54:16,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-11-16 15:54:16,700 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 15:54:16,700 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 9, 9, 1, 1, 1, 1, 1] [2022-11-16 15:54:16,705 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-16 15:54:16,902 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-16 15:54:16,903 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 15:54:16,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 15:54:16,903 INFO L85 PathProgramCache]: Analyzing trace with hash -1574171718, now seen corresponding path program 11 times [2022-11-16 15:54:16,903 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 15:54:16,903 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [649265705] [2022-11-16 15:54:16,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 15:54:16,903 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 15:54:16,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:54:17,973 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 92 proven. 89 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:54:17,974 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 15:54:17,974 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [649265705] [2022-11-16 15:54:17,974 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [649265705] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 15:54:17,974 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1166082331] [2022-11-16 15:54:17,974 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 15:54:17,974 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:54:17,974 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 15:54:17,975 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 15:54:17,978 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-16 15:54:18,040 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2022-11-16 15:54:18,040 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 15:54:18,042 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 44 conjunts are in the unsatisfiable core [2022-11-16 15:54:18,044 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 15:54:19,119 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 0 proven. 181 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:54:19,119 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 15:54:20,865 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 0 proven. 181 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:54:20,866 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1166082331] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 15:54:20,866 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2089896298] [2022-11-16 15:54:20,867 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 15:54:20,868 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 15:54:20,868 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 15:54:20,868 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 15:54:20,868 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 15:54:20,957 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 15:54:21,658 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4796#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 15:54:21,658 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 15:54:21,659 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 15:54:21,659 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 26, 26] total 72 [2022-11-16 15:54:21,659 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [127418599] [2022-11-16 15:54:21,659 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 15:54:21,659 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 72 states [2022-11-16 15:54:21,659 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 15:54:21,660 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2022-11-16 15:54:21,661 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=665, Invalid=5341, Unknown=0, NotChecked=0, Total=6006 [2022-11-16 15:54:21,661 INFO L87 Difference]: Start difference. First operand 53 states and 63 transitions. Second operand has 72 states, 72 states have (on average 1.7222222222222223) internal successors, (124), 72 states have internal predecessors, (124), 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) [2022-11-16 15:54:24,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 15:54:24,462 INFO L93 Difference]: Finished difference Result 91 states and 102 transitions. [2022-11-16 15:54:24,463 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-11-16 15:54:24,463 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 72 states have (on average 1.7222222222222223) internal successors, (124), 72 states have internal predecessors, (124), 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 43 [2022-11-16 15:54:24,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 15:54:24,464 INFO L225 Difference]: With dead ends: 91 [2022-11-16 15:54:24,464 INFO L226 Difference]: Without dead ends: 56 [2022-11-16 15:54:24,465 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2715 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=1183, Invalid=9119, Unknown=0, NotChecked=0, Total=10302 [2022-11-16 15:54:24,466 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 87 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 651 mSolverCounterSat, 122 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 773 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 122 IncrementalHoareTripleChecker+Valid, 651 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-16 15:54:24,466 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [87 Valid, 50 Invalid, 773 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [122 Valid, 651 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-16 15:54:24,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-11-16 15:54:24,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 53. [2022-11-16 15:54:24,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 52 states have (on average 1.1923076923076923) internal successors, (62), 52 states have internal predecessors, (62), 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) [2022-11-16 15:54:24,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 62 transitions. [2022-11-16 15:54:24,510 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 62 transitions. Word has length 43 [2022-11-16 15:54:24,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 15:54:24,510 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 62 transitions. [2022-11-16 15:54:24,510 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 72 states, 72 states have (on average 1.7222222222222223) internal successors, (124), 72 states have internal predecessors, (124), 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) [2022-11-16 15:54:24,511 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 62 transitions. [2022-11-16 15:54:24,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-11-16 15:54:24,511 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 15:54:24,511 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 9, 9, 1, 1, 1, 1, 1] [2022-11-16 15:54:24,516 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-16 15:54:24,715 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:54:24,715 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 15:54:24,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 15:54:24,716 INFO L85 PathProgramCache]: Analyzing trace with hash -1857533990, now seen corresponding path program 12 times [2022-11-16 15:54:24,716 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 15:54:24,716 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1634129981] [2022-11-16 15:54:24,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 15:54:24,716 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 15:54:24,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:54:25,238 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 45 proven. 147 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:54:25,238 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 15:54:25,239 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1634129981] [2022-11-16 15:54:25,239 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1634129981] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 15:54:25,239 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1862558596] [2022-11-16 15:54:25,239 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 15:54:25,239 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:54:25,239 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 15:54:25,240 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 15:54:25,269 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-16 15:54:25,311 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 15:54:25,312 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 15:54:25,313 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 39 conjunts are in the unsatisfiable core [2022-11-16 15:54:25,315 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 15:54:25,728 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 0 proven. 192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:54:25,728 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 15:54:26,159 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 0 proven. 192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:54:26,159 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1862558596] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 15:54:26,159 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1881246494] [2022-11-16 15:54:26,160 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 15:54:26,161 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 15:54:26,161 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 15:54:26,161 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 15:54:26,161 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 15:54:26,256 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 15:54:26,785 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5401#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 15:54:26,785 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 15:54:26,785 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 15:54:26,785 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 47 [2022-11-16 15:54:26,785 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [566610775] [2022-11-16 15:54:26,786 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 15:54:26,786 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-11-16 15:54:26,786 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 15:54:26,786 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-11-16 15:54:26,787 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=394, Invalid=2362, Unknown=0, NotChecked=0, Total=2756 [2022-11-16 15:54:26,787 INFO L87 Difference]: Start difference. First operand 53 states and 62 transitions. Second operand has 47 states, 47 states have (on average 1.4893617021276595) internal successors, (70), 47 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) [2022-11-16 15:54:27,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 15:54:27,547 INFO L93 Difference]: Finished difference Result 90 states and 100 transitions. [2022-11-16 15:54:27,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-11-16 15:54:27,547 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.4893617021276595) internal successors, (70), 47 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 44 [2022-11-16 15:54:27,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 15:54:27,548 INFO L225 Difference]: With dead ends: 90 [2022-11-16 15:54:27,548 INFO L226 Difference]: Without dead ends: 88 [2022-11-16 15:54:27,549 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 93 SyntacticMatches, 10 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1721 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=907, Invalid=4643, Unknown=0, NotChecked=0, Total=5550 [2022-11-16 15:54:27,549 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 164 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 349 mSolverCounterSat, 90 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 164 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 439 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 90 IncrementalHoareTripleChecker+Valid, 349 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-16 15:54:27,550 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [164 Valid, 43 Invalid, 439 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [90 Valid, 349 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-16 15:54:27,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-11-16 15:54:27,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 48. [2022-11-16 15:54:27,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 47 states have (on average 1.0425531914893618) internal successors, (49), 47 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) [2022-11-16 15:54:27,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2022-11-16 15:54:27,587 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 44 [2022-11-16 15:54:27,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 15:54:27,588 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2022-11-16 15:54:27,588 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 1.4893617021276595) internal successors, (70), 47 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) [2022-11-16 15:54:27,588 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2022-11-16 15:54:27,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-11-16 15:54:27,589 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 15:54:27,589 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 10, 10, 1, 1, 1, 1, 1] [2022-11-16 15:54:27,594 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-16 15:54:27,790 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-16 15:54:27,791 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 15:54:27,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 15:54:27,791 INFO L85 PathProgramCache]: Analyzing trace with hash -1431629180, now seen corresponding path program 13 times [2022-11-16 15:54:27,791 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 15:54:27,791 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1951048701] [2022-11-16 15:54:27,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 15:54:27,791 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 15:54:27,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:54:28,928 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 117 proven. 104 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:54:28,928 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 15:54:28,928 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1951048701] [2022-11-16 15:54:28,928 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1951048701] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 15:54:28,928 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1641957464] [2022-11-16 15:54:28,929 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 15:54:28,929 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:54:28,929 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 15:54:28,930 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 15:54:28,932 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-16 15:54:28,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:54:28,993 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 52 conjunts are in the unsatisfiable core [2022-11-16 15:54:28,995 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 15:54:29,686 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 0 proven. 221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:54:29,686 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 15:54:31,404 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 0 proven. 221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:54:31,404 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1641957464] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 15:54:31,405 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1559034326] [2022-11-16 15:54:31,406 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 15:54:31,406 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 15:54:31,407 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 15:54:31,407 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 15:54:31,407 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 15:54:31,495 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 15:54:32,100 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6022#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 15:54:32,101 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 15:54:32,101 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 15:54:32,101 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26, 26] total 63 [2022-11-16 15:54:32,101 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [435708118] [2022-11-16 15:54:32,102 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 15:54:32,102 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2022-11-16 15:54:32,102 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 15:54:32,103 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2022-11-16 15:54:32,103 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=609, Invalid=4083, Unknown=0, NotChecked=0, Total=4692 [2022-11-16 15:54:32,104 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand has 63 states, 63 states have (on average 2.0) internal successors, (126), 63 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) [2022-11-16 15:54:37,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 15:54:37,075 INFO L93 Difference]: Finished difference Result 132 states and 147 transitions. [2022-11-16 15:54:37,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2022-11-16 15:54:37,076 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 2.0) internal successors, (126), 63 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) Word has length 47 [2022-11-16 15:54:37,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 15:54:37,077 INFO L225 Difference]: With dead ends: 132 [2022-11-16 15:54:37,077 INFO L226 Difference]: Without dead ends: 94 [2022-11-16 15:54:37,078 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 99 SyntacticMatches, 0 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3515 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=1766, Invalid=11806, Unknown=0, NotChecked=0, Total=13572 [2022-11-16 15:54:37,079 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 207 mSDsluCounter, 157 mSDsCounter, 0 mSdLazyCounter, 1395 mSolverCounterSat, 194 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 207 SdHoareTripleChecker+Valid, 160 SdHoareTripleChecker+Invalid, 1589 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 194 IncrementalHoareTripleChecker+Valid, 1395 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-16 15:54:37,079 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [207 Valid, 160 Invalid, 1589 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [194 Valid, 1395 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-16 15:54:37,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2022-11-16 15:54:37,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 63. [2022-11-16 15:54:37,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 62 states have (on average 1.2096774193548387) internal successors, (75), 62 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) [2022-11-16 15:54:37,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 75 transitions. [2022-11-16 15:54:37,136 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 75 transitions. Word has length 47 [2022-11-16 15:54:37,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 15:54:37,136 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 75 transitions. [2022-11-16 15:54:37,137 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 2.0) internal successors, (126), 63 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) [2022-11-16 15:54:37,137 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 75 transitions. [2022-11-16 15:54:37,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-11-16 15:54:37,137 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 15:54:37,137 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 11, 11, 1, 1, 1, 1, 1] [2022-11-16 15:54:37,142 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-16 15:54:37,338 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-16 15:54:37,338 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 15:54:37,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 15:54:37,339 INFO L85 PathProgramCache]: Analyzing trace with hash -1237897350, now seen corresponding path program 14 times [2022-11-16 15:54:37,339 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 15:54:37,339 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2111190106] [2022-11-16 15:54:37,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 15:54:37,339 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 15:54:37,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:54:38,680 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 145 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:54:38,681 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 15:54:38,681 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2111190106] [2022-11-16 15:54:38,681 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2111190106] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 15:54:38,681 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1611357652] [2022-11-16 15:54:38,681 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 15:54:38,681 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:54:38,681 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 15:54:38,682 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 15:54:38,684 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-16 15:54:38,757 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2022-11-16 15:54:38,757 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 15:54:38,759 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 50 conjunts are in the unsatisfiable core [2022-11-16 15:54:38,768 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 15:54:40,187 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 0 proven. 265 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:54:40,188 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 15:54:42,499 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 0 proven. 265 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:54:42,499 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1611357652] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 15:54:42,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [839425991] [2022-11-16 15:54:42,501 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 15:54:42,501 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 15:54:42,501 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 15:54:42,502 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 15:54:42,502 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 15:54:42,588 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 15:54:43,262 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6842#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 15:54:43,262 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 15:54:43,262 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 15:54:43,262 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 30, 30] total 84 [2022-11-16 15:54:43,262 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1542969797] [2022-11-16 15:54:43,263 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 15:54:43,263 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 84 states [2022-11-16 15:54:43,263 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 15:54:43,264 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2022-11-16 15:54:43,265 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=879, Invalid=7131, Unknown=0, NotChecked=0, Total=8010 [2022-11-16 15:54:43,265 INFO L87 Difference]: Start difference. First operand 63 states and 75 transitions. Second operand has 84 states, 84 states have (on average 1.7619047619047619) internal successors, (148), 84 states have internal predecessors, (148), 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) [2022-11-16 15:54:47,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 15:54:47,364 INFO L93 Difference]: Finished difference Result 107 states and 120 transitions. [2022-11-16 15:54:47,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-11-16 15:54:47,365 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 84 states have (on average 1.7619047619047619) internal successors, (148), 84 states have internal predecessors, (148), 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 [2022-11-16 15:54:47,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 15:54:47,366 INFO L225 Difference]: With dead ends: 107 [2022-11-16 15:54:47,366 INFO L226 Difference]: Without dead ends: 66 [2022-11-16 15:54:47,367 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3649 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=1565, Invalid=12241, Unknown=0, NotChecked=0, Total=13806 [2022-11-16 15:54:47,367 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 126 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 1198 mSolverCounterSat, 152 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 126 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 1350 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 152 IncrementalHoareTripleChecker+Valid, 1198 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-16 15:54:47,368 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [126 Valid, 71 Invalid, 1350 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [152 Valid, 1198 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-16 15:54:47,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-11-16 15:54:47,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 63. [2022-11-16 15:54:47,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 62 states have (on average 1.1935483870967742) internal successors, (74), 62 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) [2022-11-16 15:54:47,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 74 transitions. [2022-11-16 15:54:47,415 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 74 transitions. Word has length 51 [2022-11-16 15:54:47,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 15:54:47,416 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 74 transitions. [2022-11-16 15:54:47,416 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 84 states, 84 states have (on average 1.7619047619047619) internal successors, (148), 84 states have internal predecessors, (148), 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) [2022-11-16 15:54:47,416 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 74 transitions. [2022-11-16 15:54:47,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-11-16 15:54:47,416 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 15:54:47,416 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 11, 11, 1, 1, 1, 1, 1] [2022-11-16 15:54:47,423 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2022-11-16 15:54:47,617 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-16 15:54:47,617 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 15:54:47,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 15:54:47,618 INFO L85 PathProgramCache]: Analyzing trace with hash 1541753754, now seen corresponding path program 15 times [2022-11-16 15:54:47,618 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 15:54:47,618 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1060189800] [2022-11-16 15:54:47,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 15:54:47,619 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 15:54:47,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:54:48,278 INFO L134 CoverageAnalysis]: Checked inductivity of 278 backedges. 66 proven. 212 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:54:48,278 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 15:54:48,279 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1060189800] [2022-11-16 15:54:48,279 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1060189800] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 15:54:48,279 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [659900510] [2022-11-16 15:54:48,279 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 15:54:48,279 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:54:48,279 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 15:54:48,280 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 15:54:48,282 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-16 15:54:48,343 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 15:54:48,343 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 15:54:48,345 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 45 conjunts are in the unsatisfiable core [2022-11-16 15:54:48,346 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 15:54:48,817 INFO L134 CoverageAnalysis]: Checked inductivity of 278 backedges. 0 proven. 278 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:54:48,817 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 15:54:49,399 INFO L134 CoverageAnalysis]: Checked inductivity of 278 backedges. 0 proven. 278 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:54:49,399 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [659900510] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 15:54:49,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1537816130] [2022-11-16 15:54:49,400 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 15:54:49,401 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 15:54:49,401 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 15:54:49,401 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 15:54:49,401 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 15:54:49,495 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 15:54:50,058 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7557#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 15:54:50,058 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 15:54:50,058 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 15:54:50,058 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 55 [2022-11-16 15:54:50,058 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [275403824] [2022-11-16 15:54:50,058 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 15:54:50,059 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2022-11-16 15:54:50,059 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 15:54:50,059 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2022-11-16 15:54:50,060 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=525, Invalid=3135, Unknown=0, NotChecked=0, Total=3660 [2022-11-16 15:54:50,060 INFO L87 Difference]: Start difference. First operand 63 states and 74 transitions. Second operand has 55 states, 55 states have (on average 1.490909090909091) internal successors, (82), 55 states have internal predecessors, (82), 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) [2022-11-16 15:54:51,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 15:54:51,048 INFO L93 Difference]: Finished difference Result 106 states and 118 transitions. [2022-11-16 15:54:51,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-11-16 15:54:51,048 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 1.490909090909091) internal successors, (82), 55 states have internal predecessors, (82), 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 52 [2022-11-16 15:54:51,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 15:54:51,049 INFO L225 Difference]: With dead ends: 106 [2022-11-16 15:54:51,049 INFO L226 Difference]: Without dead ends: 104 [2022-11-16 15:54:51,050 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 111 SyntacticMatches, 12 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2375 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1223, Invalid=6259, Unknown=0, NotChecked=0, Total=7482 [2022-11-16 15:54:51,051 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 173 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 474 mSolverCounterSat, 97 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 173 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 571 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 97 IncrementalHoareTripleChecker+Valid, 474 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-16 15:54:51,051 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [173 Valid, 55 Invalid, 571 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [97 Valid, 474 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-16 15:54:51,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2022-11-16 15:54:51,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 56. [2022-11-16 15:54:51,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 1.0363636363636364) internal successors, (57), 55 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) [2022-11-16 15:54:51,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 57 transitions. [2022-11-16 15:54:51,098 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 57 transitions. Word has length 52 [2022-11-16 15:54:51,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 15:54:51,099 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 57 transitions. [2022-11-16 15:54:51,099 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 1.490909090909091) internal successors, (82), 55 states have internal predecessors, (82), 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) [2022-11-16 15:54:51,099 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 57 transitions. [2022-11-16 15:54:51,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-11-16 15:54:51,100 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 15:54:51,100 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 12, 12, 1, 1, 1, 1, 1] [2022-11-16 15:54:51,104 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2022-11-16 15:54:51,300 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:54:51,301 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 15:54:51,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 15:54:51,301 INFO L85 PathProgramCache]: Analyzing trace with hash 10647236, now seen corresponding path program 16 times [2022-11-16 15:54:51,301 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 15:54:51,301 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [21577099] [2022-11-16 15:54:51,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 15:54:51,301 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 15:54:51,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:54:52,726 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 176 proven. 137 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:54:52,727 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 15:54:52,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [21577099] [2022-11-16 15:54:52,727 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [21577099] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 15:54:52,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [518152614] [2022-11-16 15:54:52,727 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 15:54:52,727 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:54:52,727 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 15:54:52,728 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 15:54:52,751 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-16 15:54:52,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:54:52,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 60 conjunts are in the unsatisfiable core [2022-11-16 15:54:52,822 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 15:54:53,701 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 0 proven. 313 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:54:53,701 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 15:54:55,876 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 0 proven. 313 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:54:55,876 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [518152614] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 15:54:55,876 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [260986011] [2022-11-16 15:54:55,878 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 15:54:55,878 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 15:54:55,878 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 15:54:55,878 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 15:54:55,878 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 15:54:55,959 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 15:54:56,646 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8286#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 15:54:56,646 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 15:54:56,646 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 15:54:56,646 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30, 30] total 73 [2022-11-16 15:54:56,646 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1351683522] [2022-11-16 15:54:56,646 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 15:54:56,647 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2022-11-16 15:54:56,647 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 15:54:56,647 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2022-11-16 15:54:56,647 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=802, Invalid=5360, Unknown=0, NotChecked=0, Total=6162 [2022-11-16 15:54:56,648 INFO L87 Difference]: Start difference. First operand 56 states and 57 transitions. Second operand has 73 states, 73 states have (on average 2.0273972602739727) internal successors, (148), 73 states have internal predecessors, (148), 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) [2022-11-16 15:55:03,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 15:55:03,246 INFO L93 Difference]: Finished difference Result 154 states and 171 transitions. [2022-11-16 15:55:03,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2022-11-16 15:55:03,247 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 2.0273972602739727) internal successors, (148), 73 states have internal predecessors, (148), 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 [2022-11-16 15:55:03,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 15:55:03,248 INFO L225 Difference]: With dead ends: 154 [2022-11-16 15:55:03,248 INFO L226 Difference]: Without dead ends: 110 [2022-11-16 15:55:03,249 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4723 ImplicationChecksByTransitivity, 8.7s TimeCoverageRelationStatistics Valid=2345, Invalid=15745, Unknown=0, NotChecked=0, Total=18090 [2022-11-16 15:55:03,249 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 256 mSDsluCounter, 205 mSDsCounter, 0 mSdLazyCounter, 1803 mSolverCounterSat, 268 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 256 SdHoareTripleChecker+Valid, 208 SdHoareTripleChecker+Invalid, 2071 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 268 IncrementalHoareTripleChecker+Valid, 1803 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-11-16 15:55:03,251 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [256 Valid, 208 Invalid, 2071 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [268 Valid, 1803 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-11-16 15:55:03,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2022-11-16 15:55:03,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 73. [2022-11-16 15:55:03,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 72 states have (on average 1.2083333333333333) internal successors, (87), 72 states have internal predecessors, (87), 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) [2022-11-16 15:55:03,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 87 transitions. [2022-11-16 15:55:03,321 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 87 transitions. Word has length 55 [2022-11-16 15:55:03,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 15:55:03,321 INFO L495 AbstractCegarLoop]: Abstraction has 73 states and 87 transitions. [2022-11-16 15:55:03,322 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 2.0273972602739727) internal successors, (148), 73 states have internal predecessors, (148), 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) [2022-11-16 15:55:03,322 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 87 transitions. [2022-11-16 15:55:03,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-11-16 15:55:03,322 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 15:55:03,322 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 13, 13, 1, 1, 1, 1, 1] [2022-11-16 15:55:03,327 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-16 15:55:03,523 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:55:03,523 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 15:55:03,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 15:55:03,524 INFO L85 PathProgramCache]: Analyzing trace with hash -1308327110, now seen corresponding path program 17 times [2022-11-16 15:55:03,524 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 15:55:03,524 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1673392470] [2022-11-16 15:55:03,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 15:55:03,524 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 15:55:03,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:55:05,164 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 210 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:55:05,165 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 15:55:05,165 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1673392470] [2022-11-16 15:55:05,165 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1673392470] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 15:55:05,165 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [276409352] [2022-11-16 15:55:05,165 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 15:55:05,165 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:55:05,165 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 15:55:05,166 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 15:55:05,168 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-16 15:55:05,258 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2022-11-16 15:55:05,258 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 15:55:05,261 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 56 conjunts are in the unsatisfiable core [2022-11-16 15:55:05,263 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 15:55:07,060 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 0 proven. 365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:55:07,060 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 15:55:09,878 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 0 proven. 365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:55:09,878 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [276409352] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 15:55:09,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1390127202] [2022-11-16 15:55:09,880 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 15:55:09,880 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 15:55:09,880 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 15:55:09,880 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 15:55:09,881 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 15:55:09,963 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 15:55:10,827 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9238#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 15:55:10,827 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 15:55:10,827 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 15:55:10,827 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 34, 34] total 96 [2022-11-16 15:55:10,827 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1313749540] [2022-11-16 15:55:10,827 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 15:55:10,828 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 96 states [2022-11-16 15:55:10,828 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 15:55:10,828 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2022-11-16 15:55:10,829 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1125, Invalid=9177, Unknown=0, NotChecked=0, Total=10302 [2022-11-16 15:55:10,829 INFO L87 Difference]: Start difference. First operand 73 states and 87 transitions. Second operand has 96 states, 96 states have (on average 1.7916666666666667) internal successors, (172), 96 states have internal predecessors, (172), 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) [2022-11-16 15:55:16,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 15:55:16,166 INFO L93 Difference]: Finished difference Result 123 states and 138 transitions. [2022-11-16 15:55:16,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-11-16 15:55:16,167 INFO L78 Accepts]: Start accepts. Automaton has has 96 states, 96 states have (on average 1.7916666666666667) internal successors, (172), 96 states have internal predecessors, (172), 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 [2022-11-16 15:55:16,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 15:55:16,167 INFO L225 Difference]: With dead ends: 123 [2022-11-16 15:55:16,167 INFO L226 Difference]: Without dead ends: 76 [2022-11-16 15:55:16,169 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4719 ImplicationChecksByTransitivity, 9.6s TimeCoverageRelationStatistics Valid=2003, Invalid=15819, Unknown=0, NotChecked=0, Total=17822 [2022-11-16 15:55:16,170 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 132 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 1277 mSolverCounterSat, 174 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 1451 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 174 IncrementalHoareTripleChecker+Valid, 1277 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-16 15:55:16,170 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [132 Valid, 73 Invalid, 1451 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [174 Valid, 1277 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-16 15:55:16,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2022-11-16 15:55:16,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 73. [2022-11-16 15:55:16,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 72 states have (on average 1.1944444444444444) internal successors, (86), 72 states have internal predecessors, (86), 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) [2022-11-16 15:55:16,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 86 transitions. [2022-11-16 15:55:16,253 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 86 transitions. Word has length 59 [2022-11-16 15:55:16,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 15:55:16,253 INFO L495 AbstractCegarLoop]: Abstraction has 73 states and 86 transitions. [2022-11-16 15:55:16,253 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 96 states, 96 states have (on average 1.7916666666666667) internal successors, (172), 96 states have internal predecessors, (172), 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) [2022-11-16 15:55:16,253 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 86 transitions. [2022-11-16 15:55:16,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-16 15:55:16,254 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 15:55:16,254 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 13, 13, 1, 1, 1, 1, 1] [2022-11-16 15:55:16,258 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-16 15:55:16,454 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2022-11-16 15:55:16,454 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 15:55:16,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 15:55:16,455 INFO L85 PathProgramCache]: Analyzing trace with hash -832274598, now seen corresponding path program 18 times [2022-11-16 15:55:16,455 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 15:55:16,455 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [660023766] [2022-11-16 15:55:16,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 15:55:16,455 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 15:55:16,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:55:17,314 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 91 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:55:17,315 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 15:55:17,315 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [660023766] [2022-11-16 15:55:17,315 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [660023766] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 15:55:17,315 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1523402449] [2022-11-16 15:55:17,315 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 15:55:17,315 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:55:17,315 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 15:55:17,317 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 15:55:17,318 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-16 15:55:17,386 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 15:55:17,386 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 15:55:17,391 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 51 conjunts are in the unsatisfiable core [2022-11-16 15:55:17,393 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 15:55:17,975 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:55:17,975 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 15:55:18,710 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:55:18,710 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1523402449] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 15:55:18,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [716811685] [2022-11-16 15:55:18,711 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 15:55:18,711 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 15:55:18,712 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 15:55:18,712 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 15:55:18,712 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 15:55:18,795 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 15:55:19,305 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10063#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 15:55:19,305 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 15:55:19,305 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 15:55:19,305 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 63 [2022-11-16 15:55:19,305 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1500494340] [2022-11-16 15:55:19,306 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 15:55:19,306 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2022-11-16 15:55:19,306 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 15:55:19,306 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2022-11-16 15:55:19,307 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=676, Invalid=4016, Unknown=0, NotChecked=0, Total=4692 [2022-11-16 15:55:19,307 INFO L87 Difference]: Start difference. First operand 73 states and 86 transitions. Second operand has 63 states, 63 states have (on average 1.492063492063492) internal successors, (94), 63 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) [2022-11-16 15:55:20,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 15:55:20,601 INFO L93 Difference]: Finished difference Result 122 states and 136 transitions. [2022-11-16 15:55:20,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-11-16 15:55:20,604 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 1.492063492063492) internal successors, (94), 63 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) Word has length 60 [2022-11-16 15:55:20,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 15:55:20,605 INFO L225 Difference]: With dead ends: 122 [2022-11-16 15:55:20,605 INFO L226 Difference]: Without dead ends: 120 [2022-11-16 15:55:20,606 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 129 SyntacticMatches, 14 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3133 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1587, Invalid=8115, Unknown=0, NotChecked=0, Total=9702 [2022-11-16 15:55:20,607 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 180 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 604 mSolverCounterSat, 118 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 180 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 722 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 118 IncrementalHoareTripleChecker+Valid, 604 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-16 15:55:20,607 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [180 Valid, 57 Invalid, 722 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [118 Valid, 604 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-16 15:55:20,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2022-11-16 15:55:20,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 64. [2022-11-16 15:55:20,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 63 states have (on average 1.0317460317460319) internal successors, (65), 63 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) [2022-11-16 15:55:20,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 65 transitions. [2022-11-16 15:55:20,682 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 65 transitions. Word has length 60 [2022-11-16 15:55:20,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 15:55:20,682 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 65 transitions. [2022-11-16 15:55:20,683 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 1.492063492063492) internal successors, (94), 63 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) [2022-11-16 15:55:20,683 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 65 transitions. [2022-11-16 15:55:20,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2022-11-16 15:55:20,684 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 15:55:20,684 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 14, 14, 1, 1, 1, 1, 1] [2022-11-16 15:55:20,688 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2022-11-16 15:55:20,886 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-11-16 15:55:20,886 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 15:55:20,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 15:55:20,886 INFO L85 PathProgramCache]: Analyzing trace with hash 558476036, now seen corresponding path program 19 times [2022-11-16 15:55:20,886 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 15:55:20,887 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1658137214] [2022-11-16 15:55:20,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 15:55:20,887 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 15:55:20,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:55:22,681 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 247 proven. 174 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:55:22,682 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 15:55:22,682 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1658137214] [2022-11-16 15:55:22,682 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1658137214] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 15:55:22,682 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1053022231] [2022-11-16 15:55:22,682 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 15:55:22,682 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:55:22,683 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 15:55:22,683 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 15:55:22,686 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-16 15:55:22,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:55:22,757 INFO L263 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 68 conjunts are in the unsatisfiable core [2022-11-16 15:55:22,759 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 15:55:23,829 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 0 proven. 421 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:55:23,830 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 15:55:26,644 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 0 proven. 421 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:55:26,645 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1053022231] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 15:55:26,645 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [865489011] [2022-11-16 15:55:26,646 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 15:55:26,647 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 15:55:26,647 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 15:55:26,647 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 15:55:26,647 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 15:55:26,737 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 15:55:27,492 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10900#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 15:55:27,492 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 15:55:27,492 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 15:55:27,492 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34, 34] total 83 [2022-11-16 15:55:27,493 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1349295578] [2022-11-16 15:55:27,493 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 15:55:27,493 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2022-11-16 15:55:27,493 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 15:55:27,494 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2022-11-16 15:55:27,495 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1023, Invalid=6809, Unknown=0, NotChecked=0, Total=7832 [2022-11-16 15:55:27,495 INFO L87 Difference]: Start difference. First operand 64 states and 65 transitions. Second operand has 83 states, 83 states have (on average 2.0481927710843375) internal successors, (170), 83 states have internal predecessors, (170), 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) [2022-11-16 15:55:36,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 15:55:36,141 INFO L93 Difference]: Finished difference Result 176 states and 195 transitions. [2022-11-16 15:55:36,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2022-11-16 15:55:36,142 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 2.0481927710843375) internal successors, (170), 83 states have internal predecessors, (170), 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 63 [2022-11-16 15:55:36,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 15:55:36,143 INFO L225 Difference]: With dead ends: 176 [2022-11-16 15:55:36,143 INFO L226 Difference]: Without dead ends: 126 [2022-11-16 15:55:36,144 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6107 ImplicationChecksByTransitivity, 11.1s TimeCoverageRelationStatistics Valid=3008, Invalid=20248, Unknown=0, NotChecked=0, Total=23256 [2022-11-16 15:55:36,144 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 314 mSDsluCounter, 274 mSDsCounter, 0 mSdLazyCounter, 2395 mSolverCounterSat, 338 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 314 SdHoareTripleChecker+Valid, 277 SdHoareTripleChecker+Invalid, 2733 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 338 IncrementalHoareTripleChecker+Valid, 2395 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-11-16 15:55:36,145 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [314 Valid, 277 Invalid, 2733 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [338 Valid, 2395 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-11-16 15:55:36,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2022-11-16 15:55:36,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 83. [2022-11-16 15:55:36,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 82 states have (on average 1.2073170731707317) internal successors, (99), 82 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) [2022-11-16 15:55:36,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 99 transitions. [2022-11-16 15:55:36,258 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 99 transitions. Word has length 63 [2022-11-16 15:55:36,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 15:55:36,258 INFO L495 AbstractCegarLoop]: Abstraction has 83 states and 99 transitions. [2022-11-16 15:55:36,259 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 83 states have (on average 2.0481927710843375) internal successors, (170), 83 states have internal predecessors, (170), 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) [2022-11-16 15:55:36,259 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 99 transitions. [2022-11-16 15:55:36,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-11-16 15:55:36,259 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 15:55:36,259 INFO L195 NwaCegarLoop]: trace histogram [16, 16, 15, 15, 1, 1, 1, 1, 1] [2022-11-16 15:55:36,268 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-11-16 15:55:36,464 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2022-11-16 15:55:36,465 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 15:55:36,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 15:55:36,465 INFO L85 PathProgramCache]: Analyzing trace with hash 1798309626, now seen corresponding path program 20 times [2022-11-16 15:55:36,465 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 15:55:36,465 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [380705964] [2022-11-16 15:55:36,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 15:55:36,465 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 15:55:36,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:55:38,424 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 287 proven. 194 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:55:38,424 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 15:55:38,425 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [380705964] [2022-11-16 15:55:38,425 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [380705964] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 15:55:38,425 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [849511124] [2022-11-16 15:55:38,425 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 15:55:38,425 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:55:38,425 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 15:55:38,426 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 15:55:38,428 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-16 15:55:38,521 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2022-11-16 15:55:38,521 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 15:55:38,523 INFO L263 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 62 conjunts are in the unsatisfiable core [2022-11-16 15:55:38,524 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 15:55:40,765 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 0 proven. 481 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:55:40,765 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 15:55:44,199 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 0 proven. 481 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:55:44,199 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [849511124] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 15:55:44,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1715659817] [2022-11-16 15:55:44,200 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 15:55:44,200 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 15:55:44,201 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 15:55:44,201 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 15:55:44,201 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 15:55:44,275 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 15:55:45,097 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11984#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 15:55:45,097 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 15:55:45,098 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 15:55:45,098 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 38, 38] total 108 [2022-11-16 15:55:45,098 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [418076004] [2022-11-16 15:55:45,098 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 15:55:45,098 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 108 states [2022-11-16 15:55:45,098 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 15:55:45,099 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 108 interpolants. [2022-11-16 15:55:45,099 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1403, Invalid=11479, Unknown=0, NotChecked=0, Total=12882 [2022-11-16 15:55:45,100 INFO L87 Difference]: Start difference. First operand 83 states and 99 transitions. Second operand has 108 states, 108 states have (on average 1.8148148148148149) internal successors, (196), 108 states have internal predecessors, (196), 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) [2022-11-16 15:55:52,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 15:55:52,060 INFO L93 Difference]: Finished difference Result 139 states and 156 transitions. [2022-11-16 15:55:52,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-11-16 15:55:52,061 INFO L78 Accepts]: Start accepts. Automaton has has 108 states, 108 states have (on average 1.8148148148148149) internal successors, (196), 108 states have internal predecessors, (196), 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 67 [2022-11-16 15:55:52,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 15:55:52,061 INFO L225 Difference]: With dead ends: 139 [2022-11-16 15:55:52,061 INFO L226 Difference]: Without dead ends: 86 [2022-11-16 15:55:52,063 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5925 ImplicationChecksByTransitivity, 12.2s TimeCoverageRelationStatistics Valid=2497, Invalid=19853, Unknown=0, NotChecked=0, Total=22350 [2022-11-16 15:55:52,064 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 148 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 1523 mSolverCounterSat, 197 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 148 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 1720 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 197 IncrementalHoareTripleChecker+Valid, 1523 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-16 15:55:52,064 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [148 Valid, 78 Invalid, 1720 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [197 Valid, 1523 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-16 15:55:52,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-11-16 15:55:52,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 83. [2022-11-16 15:55:52,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 82 states have (on average 1.1951219512195121) internal successors, (98), 82 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) [2022-11-16 15:55:52,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 98 transitions. [2022-11-16 15:55:52,186 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 98 transitions. Word has length 67 [2022-11-16 15:55:52,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 15:55:52,186 INFO L495 AbstractCegarLoop]: Abstraction has 83 states and 98 transitions. [2022-11-16 15:55:52,186 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 108 states, 108 states have (on average 1.8148148148148149) internal successors, (196), 108 states have internal predecessors, (196), 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) [2022-11-16 15:55:52,186 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 98 transitions. [2022-11-16 15:55:52,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-11-16 15:55:52,187 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 15:55:52,187 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 15, 15, 1, 1, 1, 1, 1] [2022-11-16 15:55:52,196 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2022-11-16 15:55:52,392 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-11-16 15:55:52,392 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 15:55:52,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 15:55:52,393 INFO L85 PathProgramCache]: Analyzing trace with hash -1637752038, now seen corresponding path program 21 times [2022-11-16 15:55:52,393 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 15:55:52,393 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [574860727] [2022-11-16 15:55:52,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 15:55:52,393 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 15:55:52,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:55:53,321 INFO L134 CoverageAnalysis]: Checked inductivity of 498 backedges. 120 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:55:53,321 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 15:55:53,322 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [574860727] [2022-11-16 15:55:53,322 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [574860727] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 15:55:53,322 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [30793586] [2022-11-16 15:55:53,322 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 15:55:53,322 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:55:53,322 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 15:55:53,323 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 15:55:53,325 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-16 15:55:53,397 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 15:55:53,397 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 15:55:53,399 INFO L263 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 57 conjunts are in the unsatisfiable core [2022-11-16 15:55:53,400 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 15:55:54,128 INFO L134 CoverageAnalysis]: Checked inductivity of 498 backedges. 0 proven. 498 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:55:54,129 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 15:55:55,047 INFO L134 CoverageAnalysis]: Checked inductivity of 498 backedges. 0 proven. 498 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:55:55,047 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [30793586] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 15:55:55,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1359221638] [2022-11-16 15:55:55,049 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 15:55:55,049 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 15:55:55,049 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 15:55:55,049 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 15:55:55,050 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 15:55:55,138 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 15:55:55,690 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12919#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 15:55:55,691 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 15:55:55,691 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 15:55:55,691 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 71 [2022-11-16 15:55:55,691 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1211614721] [2022-11-16 15:55:55,691 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 15:55:55,692 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2022-11-16 15:55:55,692 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 15:55:55,692 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2022-11-16 15:55:55,693 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=847, Invalid=5005, Unknown=0, NotChecked=0, Total=5852 [2022-11-16 15:55:55,693 INFO L87 Difference]: Start difference. First operand 83 states and 98 transitions. Second operand has 71 states, 71 states have (on average 1.4929577464788732) internal successors, (106), 71 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) [2022-11-16 15:55:57,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 15:55:57,223 INFO L93 Difference]: Finished difference Result 138 states and 154 transitions. [2022-11-16 15:55:57,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-11-16 15:55:57,223 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 1.4929577464788732) internal successors, (106), 71 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) Word has length 68 [2022-11-16 15:55:57,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 15:55:57,224 INFO L225 Difference]: With dead ends: 138 [2022-11-16 15:55:57,224 INFO L226 Difference]: Without dead ends: 136 [2022-11-16 15:55:57,225 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 147 SyntacticMatches, 16 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3995 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=1999, Invalid=10211, Unknown=0, NotChecked=0, Total=12210 [2022-11-16 15:55:57,226 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 241 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 679 mSolverCounterSat, 153 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 241 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 832 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 153 IncrementalHoareTripleChecker+Valid, 679 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-16 15:55:57,226 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [241 Valid, 56 Invalid, 832 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [153 Valid, 679 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-16 15:55:57,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2022-11-16 15:55:57,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 72. [2022-11-16 15:55:57,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 71 states have (on average 1.028169014084507) internal successors, (73), 71 states have internal predecessors, (73), 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) [2022-11-16 15:55:57,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2022-11-16 15:55:57,312 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 68 [2022-11-16 15:55:57,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 15:55:57,313 INFO L495 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2022-11-16 15:55:57,313 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 1.4929577464788732) internal successors, (106), 71 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) [2022-11-16 15:55:57,313 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2022-11-16 15:55:57,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-11-16 15:55:57,313 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 15:55:57,313 INFO L195 NwaCegarLoop]: trace histogram [17, 17, 16, 16, 1, 1, 1, 1, 1] [2022-11-16 15:55:57,318 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-11-16 15:55:57,515 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2022-11-16 15:55:57,515 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 15:55:57,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 15:55:57,515 INFO L85 PathProgramCache]: Analyzing trace with hash 562343748, now seen corresponding path program 22 times [2022-11-16 15:55:57,516 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 15:55:57,516 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [566559527] [2022-11-16 15:55:57,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 15:55:57,516 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 15:55:57,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:55:59,698 INFO L134 CoverageAnalysis]: Checked inductivity of 545 backedges. 330 proven. 215 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:55:59,698 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 15:55:59,698 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [566559527] [2022-11-16 15:55:59,698 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [566559527] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 15:55:59,698 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1521715592] [2022-11-16 15:55:59,698 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 15:55:59,698 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:55:59,699 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 15:55:59,699 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 15:55:59,702 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-11-16 15:55:59,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:55:59,778 INFO L263 TraceCheckSpWp]: Trace formula consists of 284 conjuncts, 76 conjunts are in the unsatisfiable core [2022-11-16 15:55:59,780 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 15:56:01,096 INFO L134 CoverageAnalysis]: Checked inductivity of 545 backedges. 0 proven. 545 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:56:01,096 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 15:56:04,354 INFO L134 CoverageAnalysis]: Checked inductivity of 545 backedges. 0 proven. 545 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:56:04,355 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1521715592] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 15:56:04,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1486267209] [2022-11-16 15:56:04,356 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 15:56:04,356 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 15:56:04,356 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 15:56:04,356 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 15:56:04,356 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 15:56:04,432 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 15:56:05,366 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13864#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 15:56:05,366 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 15:56:05,366 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 15:56:05,367 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38, 38] total 93 [2022-11-16 15:56:05,367 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [660781305] [2022-11-16 15:56:05,367 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 15:56:05,367 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 93 states [2022-11-16 15:56:05,367 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 15:56:05,368 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2022-11-16 15:56:05,369 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1272, Invalid=8430, Unknown=0, NotChecked=0, Total=9702 [2022-11-16 15:56:05,369 INFO L87 Difference]: Start difference. First operand 72 states and 73 transitions. Second operand has 93 states, 93 states have (on average 2.064516129032258) internal successors, (192), 93 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) [2022-11-16 15:56:16,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 15:56:16,327 INFO L93 Difference]: Finished difference Result 198 states and 219 transitions. [2022-11-16 15:56:16,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2022-11-16 15:56:16,328 INFO L78 Accepts]: Start accepts. Automaton has has 93 states, 93 states have (on average 2.064516129032258) internal successors, (192), 93 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 71 [2022-11-16 15:56:16,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 15:56:16,329 INFO L225 Difference]: With dead ends: 198 [2022-11-16 15:56:16,329 INFO L226 Difference]: Without dead ends: 142 [2022-11-16 15:56:16,331 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 322 GetRequests, 153 SyntacticMatches, 0 SemanticMatches, 169 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7667 ImplicationChecksByTransitivity, 14.0s TimeCoverageRelationStatistics Valid=3755, Invalid=25315, Unknown=0, NotChecked=0, Total=29070 [2022-11-16 15:56:16,332 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 371 mSDsluCounter, 346 mSDsCounter, 0 mSdLazyCounter, 3163 mSolverCounterSat, 417 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 371 SdHoareTripleChecker+Valid, 349 SdHoareTripleChecker+Invalid, 3580 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 417 IncrementalHoareTripleChecker+Valid, 3163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2022-11-16 15:56:16,332 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [371 Valid, 349 Invalid, 3580 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [417 Valid, 3163 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2022-11-16 15:56:16,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2022-11-16 15:56:16,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 93. [2022-11-16 15:56:16,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 92 states have (on average 1.2065217391304348) internal successors, (111), 92 states have internal predecessors, (111), 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) [2022-11-16 15:56:16,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 111 transitions. [2022-11-16 15:56:16,469 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 111 transitions. Word has length 71 [2022-11-16 15:56:16,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 15:56:16,469 INFO L495 AbstractCegarLoop]: Abstraction has 93 states and 111 transitions. [2022-11-16 15:56:16,469 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 93 states, 93 states have (on average 2.064516129032258) internal successors, (192), 93 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) [2022-11-16 15:56:16,469 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 111 transitions. [2022-11-16 15:56:16,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2022-11-16 15:56:16,470 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 15:56:16,470 INFO L195 NwaCegarLoop]: trace histogram [18, 18, 17, 17, 1, 1, 1, 1, 1] [2022-11-16 15:56:16,475 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-11-16 15:56:16,671 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:56:16,671 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 15:56:16,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 15:56:16,671 INFO L85 PathProgramCache]: Analyzing trace with hash 307608250, now seen corresponding path program 23 times [2022-11-16 15:56:16,671 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 15:56:16,671 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1779331727] [2022-11-16 15:56:16,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 15:56:16,672 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 15:56:16,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:56:19,053 INFO L134 CoverageAnalysis]: Checked inductivity of 613 backedges. 376 proven. 237 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:56:19,053 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 15:56:19,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1779331727] [2022-11-16 15:56:19,053 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1779331727] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 15:56:19,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [764704376] [2022-11-16 15:56:19,054 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 15:56:19,054 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:56:19,054 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 15:56:19,059 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 15:56:19,062 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-11-16 15:56:19,158 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2022-11-16 15:56:19,158 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 15:56:19,161 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 68 conjunts are in the unsatisfiable core [2022-11-16 15:56:19,163 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 15:56:21,864 INFO L134 CoverageAnalysis]: Checked inductivity of 613 backedges. 0 proven. 613 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:56:21,864 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 15:56:25,994 INFO L134 CoverageAnalysis]: Checked inductivity of 613 backedges. 0 proven. 613 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:56:25,994 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [764704376] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 15:56:25,994 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [473388838] [2022-11-16 15:56:25,995 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 15:56:25,996 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 15:56:25,996 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 15:56:25,996 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 15:56:25,996 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 15:56:26,075 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 15:56:26,966 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15080#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 15:56:26,966 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 15:56:26,966 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 15:56:26,966 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 42, 42] total 120 [2022-11-16 15:56:26,966 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [405287927] [2022-11-16 15:56:26,966 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 15:56:26,967 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 120 states [2022-11-16 15:56:26,967 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 15:56:26,967 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 120 interpolants. [2022-11-16 15:56:26,968 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1713, Invalid=14037, Unknown=0, NotChecked=0, Total=15750 [2022-11-16 15:56:26,968 INFO L87 Difference]: Start difference. First operand 93 states and 111 transitions. Second operand has 120 states, 120 states have (on average 1.8333333333333333) internal successors, (220), 120 states have internal predecessors, (220), 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) [2022-11-16 15:56:36,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 15:56:36,162 INFO L93 Difference]: Finished difference Result 155 states and 174 transitions. [2022-11-16 15:56:36,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-11-16 15:56:36,163 INFO L78 Accepts]: Start accepts. Automaton has has 120 states, 120 states have (on average 1.8333333333333333) internal successors, (220), 120 states have internal predecessors, (220), 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 [2022-11-16 15:56:36,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 15:56:36,163 INFO L225 Difference]: With dead ends: 155 [2022-11-16 15:56:36,163 INFO L226 Difference]: Without dead ends: 96 [2022-11-16 15:56:36,165 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 140 SyntacticMatches, 0 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7267 ImplicationChecksByTransitivity, 15.3s TimeCoverageRelationStatistics Valid=3047, Invalid=24343, Unknown=0, NotChecked=0, Total=27390 [2022-11-16 15:56:36,165 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 163 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 2303 mSolverCounterSat, 256 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 163 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 2559 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 256 IncrementalHoareTripleChecker+Valid, 2303 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-11-16 15:56:36,165 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [163 Valid, 98 Invalid, 2559 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [256 Valid, 2303 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-11-16 15:56:36,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2022-11-16 15:56:36,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 93. [2022-11-16 15:56:36,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 92 states have (on average 1.1956521739130435) internal successors, (110), 92 states have internal predecessors, (110), 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) [2022-11-16 15:56:36,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 110 transitions. [2022-11-16 15:56:36,392 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 110 transitions. Word has length 75 [2022-11-16 15:56:36,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 15:56:36,392 INFO L495 AbstractCegarLoop]: Abstraction has 93 states and 110 transitions. [2022-11-16 15:56:36,392 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 120 states, 120 states have (on average 1.8333333333333333) internal successors, (220), 120 states have internal predecessors, (220), 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) [2022-11-16 15:56:36,393 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 110 transitions. [2022-11-16 15:56:36,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-11-16 15:56:36,393 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 15:56:36,393 INFO L195 NwaCegarLoop]: trace histogram [19, 18, 17, 17, 1, 1, 1, 1, 1] [2022-11-16 15:56:36,399 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-11-16 15:56:36,599 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-11-16 15:56:36,599 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 15:56:36,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 15:56:36,600 INFO L85 PathProgramCache]: Analyzing trace with hash -596019494, now seen corresponding path program 24 times [2022-11-16 15:56:36,600 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 15:56:36,600 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1346125552] [2022-11-16 15:56:36,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 15:56:36,600 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 15:56:36,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:56:37,799 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 153 proven. 479 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:56:37,799 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 15:56:37,799 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1346125552] [2022-11-16 15:56:37,799 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1346125552] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 15:56:37,799 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [36392166] [2022-11-16 15:56:37,800 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 15:56:37,800 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:56:37,800 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 15:56:37,801 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 15:56:37,807 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-11-16 15:56:37,893 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 15:56:37,893 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 15:56:37,896 INFO L263 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 63 conjunts are in the unsatisfiable core [2022-11-16 15:56:37,898 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 15:56:38,795 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 0 proven. 632 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:56:38,795 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 15:56:39,903 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 0 proven. 632 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:56:39,903 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [36392166] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 15:56:39,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1451563626] [2022-11-16 15:56:39,904 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 15:56:39,904 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 15:56:39,904 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 15:56:39,905 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 15:56:39,905 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 15:56:39,984 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 15:56:40,697 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16125#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 15:56:40,697 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 15:56:40,698 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 15:56:40,698 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 79 [2022-11-16 15:56:40,698 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [871690422] [2022-11-16 15:56:40,698 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 15:56:40,698 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2022-11-16 15:56:40,698 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 15:56:40,699 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2022-11-16 15:56:40,699 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1038, Invalid=6102, Unknown=0, NotChecked=0, Total=7140 [2022-11-16 15:56:40,699 INFO L87 Difference]: Start difference. First operand 93 states and 110 transitions. Second operand has 79 states, 79 states have (on average 1.4936708860759493) internal successors, (118), 79 states have internal predecessors, (118), 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) [2022-11-16 15:56:42,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 15:56:42,540 INFO L93 Difference]: Finished difference Result 154 states and 172 transitions. [2022-11-16 15:56:42,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-11-16 15:56:42,540 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 1.4936708860759493) internal successors, (118), 79 states have internal predecessors, (118), 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 [2022-11-16 15:56:42,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 15:56:42,541 INFO L225 Difference]: With dead ends: 154 [2022-11-16 15:56:42,541 INFO L226 Difference]: Without dead ends: 152 [2022-11-16 15:56:42,542 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 165 SyntacticMatches, 18 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4961 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=2459, Invalid=12547, Unknown=0, NotChecked=0, Total=15006 [2022-11-16 15:56:42,542 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 291 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 804 mSolverCounterSat, 178 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 291 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 982 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 178 IncrementalHoareTripleChecker+Valid, 804 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-16 15:56:42,543 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [291 Valid, 69 Invalid, 982 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [178 Valid, 804 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-16 15:56:42,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2022-11-16 15:56:42,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 80. [2022-11-16 15:56:42,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.0253164556962024) internal successors, (81), 79 states have internal predecessors, (81), 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) [2022-11-16 15:56:42,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 81 transitions. [2022-11-16 15:56:42,656 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 81 transitions. Word has length 76 [2022-11-16 15:56:42,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 15:56:42,657 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 81 transitions. [2022-11-16 15:56:42,657 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 79 states have (on average 1.4936708860759493) internal successors, (118), 79 states have internal predecessors, (118), 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) [2022-11-16 15:56:42,657 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 81 transitions. [2022-11-16 15:56:42,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-11-16 15:56:42,657 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 15:56:42,658 INFO L195 NwaCegarLoop]: trace histogram [19, 19, 18, 18, 1, 1, 1, 1, 1] [2022-11-16 15:56:42,667 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-11-16 15:56:42,863 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-11-16 15:56:42,863 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 15:56:42,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 15:56:42,863 INFO L85 PathProgramCache]: Analyzing trace with hash -617118844, now seen corresponding path program 25 times [2022-11-16 15:56:42,863 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 15:56:42,864 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [815507088] [2022-11-16 15:56:42,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 15:56:42,864 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 15:56:42,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:56:45,354 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 425 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:56:45,354 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 15:56:45,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [815507088] [2022-11-16 15:56:45,355 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [815507088] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 15:56:45,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [157503082] [2022-11-16 15:56:45,355 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 15:56:45,355 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:56:45,356 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 15:56:45,360 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 15:56:45,362 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-11-16 15:56:45,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:56:45,452 INFO L263 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 84 conjunts are in the unsatisfiable core [2022-11-16 15:56:45,455 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 15:56:47,024 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 0 proven. 685 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:56:47,024 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 15:56:50,981 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 0 proven. 685 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:56:50,982 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [157503082] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 15:56:50,982 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [72778406] [2022-11-16 15:56:50,983 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 15:56:50,983 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 15:56:50,984 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 15:56:50,984 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 15:56:50,984 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 15:56:51,077 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 15:56:51,963 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17178#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 15:56:51,963 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 15:56:51,963 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 15:56:51,964 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42, 42] total 103 [2022-11-16 15:56:51,965 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1401071487] [2022-11-16 15:56:51,965 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 15:56:51,966 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 103 states [2022-11-16 15:56:51,966 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 15:56:51,966 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2022-11-16 15:56:51,967 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1549, Invalid=10223, Unknown=0, NotChecked=0, Total=11772 [2022-11-16 15:56:51,967 INFO L87 Difference]: Start difference. First operand 80 states and 81 transitions. Second operand has 103 states, 103 states have (on average 2.0776699029126213) internal successors, (214), 103 states have internal predecessors, (214), 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) [2022-11-16 15:57:05,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 15:57:05,611 INFO L93 Difference]: Finished difference Result 220 states and 243 transitions. [2022-11-16 15:57:05,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2022-11-16 15:57:05,611 INFO L78 Accepts]: Start accepts. Automaton has has 103 states, 103 states have (on average 2.0776699029126213) internal successors, (214), 103 states have internal predecessors, (214), 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 [2022-11-16 15:57:05,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 15:57:05,612 INFO L225 Difference]: With dead ends: 220 [2022-11-16 15:57:05,612 INFO L226 Difference]: Without dead ends: 158 [2022-11-16 15:57:05,614 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 358 GetRequests, 171 SyntacticMatches, 0 SemanticMatches, 187 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9403 ImplicationChecksByTransitivity, 17.2s TimeCoverageRelationStatistics Valid=4586, Invalid=30946, Unknown=0, NotChecked=0, Total=35532 [2022-11-16 15:57:05,615 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 438 mSDsluCounter, 417 mSDsCounter, 0 mSdLazyCounter, 3647 mSolverCounterSat, 485 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 438 SdHoareTripleChecker+Valid, 420 SdHoareTripleChecker+Invalid, 4132 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 485 IncrementalHoareTripleChecker+Valid, 3647 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2022-11-16 15:57:05,615 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [438 Valid, 420 Invalid, 4132 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [485 Valid, 3647 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2022-11-16 15:57:05,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2022-11-16 15:57:05,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 103. [2022-11-16 15:57:05,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 102 states have (on average 1.2058823529411764) internal successors, (123), 102 states have internal predecessors, (123), 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) [2022-11-16 15:57:05,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 123 transitions. [2022-11-16 15:57:05,836 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 123 transitions. Word has length 79 [2022-11-16 15:57:05,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 15:57:05,836 INFO L495 AbstractCegarLoop]: Abstraction has 103 states and 123 transitions. [2022-11-16 15:57:05,836 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 103 states, 103 states have (on average 2.0776699029126213) internal successors, (214), 103 states have internal predecessors, (214), 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) [2022-11-16 15:57:05,836 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 123 transitions. [2022-11-16 15:57:05,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2022-11-16 15:57:05,837 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 15:57:05,837 INFO L195 NwaCegarLoop]: trace histogram [20, 20, 19, 19, 1, 1, 1, 1, 1] [2022-11-16 15:57:05,841 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2022-11-16 15:57:06,037 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-11-16 15:57:06,037 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 15:57:06,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 15:57:06,038 INFO L85 PathProgramCache]: Analyzing trace with hash -216949126, now seen corresponding path program 26 times [2022-11-16 15:57:06,038 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 15:57:06,038 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [774800935] [2022-11-16 15:57:06,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 15:57:06,038 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 15:57:06,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:57:08,705 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 477 proven. 284 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:57:08,705 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 15:57:08,705 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [774800935] [2022-11-16 15:57:08,705 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [774800935] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 15:57:08,705 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [137079190] [2022-11-16 15:57:08,705 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 15:57:08,705 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:57:08,705 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 15:57:08,706 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 15:57:08,708 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-11-16 15:57:08,818 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2022-11-16 15:57:08,819 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 15:57:08,822 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 80 conjunts are in the unsatisfiable core [2022-11-16 15:57:08,824 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 15:57:12,387 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 0 proven. 761 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:57:12,387 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 15:57:17,610 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 0 proven. 761 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:57:17,610 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [137079190] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 15:57:17,610 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1208056357] [2022-11-16 15:57:17,611 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 15:57:17,611 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 15:57:17,612 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 15:57:17,612 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 15:57:17,612 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 15:57:17,697 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 15:57:18,660 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18530#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 15:57:18,660 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 15:57:18,660 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 15:57:18,660 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 48, 48] total 136 [2022-11-16 15:57:18,661 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [463189118] [2022-11-16 15:57:18,661 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 15:57:18,661 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 136 states [2022-11-16 15:57:18,661 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 15:57:18,662 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 136 interpolants. [2022-11-16 15:57:18,663 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2166, Invalid=17856, Unknown=0, NotChecked=0, Total=20022 [2022-11-16 15:57:18,663 INFO L87 Difference]: Start difference. First operand 103 states and 123 transitions. Second operand has 136 states, 136 states have (on average 1.7941176470588236) internal successors, (244), 136 states have internal predecessors, (244), 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) [2022-11-16 15:57:30,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 15:57:30,114 INFO L93 Difference]: Finished difference Result 171 states and 192 transitions. [2022-11-16 15:57:30,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2022-11-16 15:57:30,115 INFO L78 Accepts]: Start accepts. Automaton has has 136 states, 136 states have (on average 1.7941176470588236) internal successors, (244), 136 states have internal predecessors, (244), 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 83 [2022-11-16 15:57:30,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 15:57:30,116 INFO L225 Difference]: With dead ends: 171 [2022-11-16 15:57:30,116 INFO L226 Difference]: Without dead ends: 106 [2022-11-16 15:57:30,117 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 337 GetRequests, 152 SyntacticMatches, 0 SemanticMatches, 185 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9507 ImplicationChecksByTransitivity, 19.4s TimeCoverageRelationStatistics Valid=3848, Invalid=30934, Unknown=0, NotChecked=0, Total=34782 [2022-11-16 15:57:30,118 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 248 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 2163 mSolverCounterSat, 346 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 248 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 2509 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 346 IncrementalHoareTripleChecker+Valid, 2163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-11-16 15:57:30,118 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [248 Valid, 84 Invalid, 2509 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [346 Valid, 2163 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-11-16 15:57:30,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2022-11-16 15:57:30,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 103. [2022-11-16 15:57:30,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 102 states have (on average 1.196078431372549) internal successors, (122), 102 states have internal predecessors, (122), 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) [2022-11-16 15:57:30,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 122 transitions. [2022-11-16 15:57:30,281 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 122 transitions. Word has length 83 [2022-11-16 15:57:30,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 15:57:30,281 INFO L495 AbstractCegarLoop]: Abstraction has 103 states and 122 transitions. [2022-11-16 15:57:30,281 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 136 states, 136 states have (on average 1.7941176470588236) internal successors, (244), 136 states have internal predecessors, (244), 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) [2022-11-16 15:57:30,281 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 122 transitions. [2022-11-16 15:57:30,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2022-11-16 15:57:30,282 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 15:57:30,282 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 19, 19, 1, 1, 1, 1, 1] [2022-11-16 15:57:30,286 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-11-16 15:57:30,482 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:57:30,482 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 15:57:30,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 15:57:30,483 INFO L85 PathProgramCache]: Analyzing trace with hash -1270400358, now seen corresponding path program 27 times [2022-11-16 15:57:30,483 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 15:57:30,483 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1970205518] [2022-11-16 15:57:30,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 15:57:30,483 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 15:57:30,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:57:31,732 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 190 proven. 592 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:57:31,732 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 15:57:31,732 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1970205518] [2022-11-16 15:57:31,732 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1970205518] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 15:57:31,732 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1959615303] [2022-11-16 15:57:31,732 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 15:57:31,733 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:57:31,733 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 15:57:31,734 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 15:57:31,760 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-11-16 15:57:31,831 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 15:57:31,831 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 15:57:31,835 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 69 conjunts are in the unsatisfiable core [2022-11-16 15:57:31,837 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 15:57:32,861 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 0 proven. 782 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:57:32,861 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 15:57:34,167 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 0 proven. 782 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:57:34,167 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1959615303] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 15:57:34,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [98155004] [2022-11-16 15:57:34,169 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 15:57:34,169 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 15:57:34,169 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 15:57:34,169 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 15:57:34,170 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 15:57:34,263 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 15:57:35,002 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19687#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 15:57:35,002 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 15:57:35,002 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 15:57:35,003 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 87 [2022-11-16 15:57:35,003 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2118814431] [2022-11-16 15:57:35,003 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 15:57:35,003 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 87 states [2022-11-16 15:57:35,004 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 15:57:35,004 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2022-11-16 15:57:35,005 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1249, Invalid=7307, Unknown=0, NotChecked=0, Total=8556 [2022-11-16 15:57:35,005 INFO L87 Difference]: Start difference. First operand 103 states and 122 transitions. Second operand has 87 states, 87 states have (on average 1.4942528735632183) internal successors, (130), 87 states have internal predecessors, (130), 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) [2022-11-16 15:57:37,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 15:57:37,201 INFO L93 Difference]: Finished difference Result 170 states and 190 transitions. [2022-11-16 15:57:37,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2022-11-16 15:57:37,202 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 87 states have (on average 1.4942528735632183) internal successors, (130), 87 states have internal predecessors, (130), 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 [2022-11-16 15:57:37,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 15:57:37,203 INFO L225 Difference]: With dead ends: 170 [2022-11-16 15:57:37,203 INFO L226 Difference]: Without dead ends: 168 [2022-11-16 15:57:37,204 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 336 GetRequests, 183 SyntacticMatches, 20 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6031 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=2967, Invalid=15123, Unknown=0, NotChecked=0, Total=18090 [2022-11-16 15:57:37,204 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 288 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 942 mSolverCounterSat, 172 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 288 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 1114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 172 IncrementalHoareTripleChecker+Valid, 942 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-16 15:57:37,205 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [288 Valid, 70 Invalid, 1114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [172 Valid, 942 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-16 15:57:37,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2022-11-16 15:57:37,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 88. [2022-11-16 15:57:37,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 87 states have (on average 1.0229885057471264) internal successors, (89), 87 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) [2022-11-16 15:57:37,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 89 transitions. [2022-11-16 15:57:37,340 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 89 transitions. Word has length 84 [2022-11-16 15:57:37,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 15:57:37,341 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 89 transitions. [2022-11-16 15:57:37,341 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 87 states, 87 states have (on average 1.4942528735632183) internal successors, (130), 87 states have internal predecessors, (130), 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) [2022-11-16 15:57:37,341 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 89 transitions. [2022-11-16 15:57:37,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2022-11-16 15:57:37,341 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 15:57:37,342 INFO L195 NwaCegarLoop]: trace histogram [21, 21, 20, 20, 1, 1, 1, 1, 1] [2022-11-16 15:57:37,352 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2022-11-16 15:57:37,547 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:57:37,547 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 15:57:37,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 15:57:37,548 INFO L85 PathProgramCache]: Analyzing trace with hash 759572420, now seen corresponding path program 28 times [2022-11-16 15:57:37,548 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 15:57:37,548 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2027314491] [2022-11-16 15:57:37,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 15:57:37,548 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 15:57:37,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:57:40,147 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 532 proven. 309 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:57:40,147 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 15:57:40,147 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2027314491] [2022-11-16 15:57:40,147 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2027314491] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 15:57:40,147 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [297439157] [2022-11-16 15:57:40,147 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 15:57:40,148 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:57:40,148 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 15:57:40,149 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 15:57:40,152 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-11-16 15:57:40,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:57:40,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 344 conjuncts, 92 conjunts are in the unsatisfiable core [2022-11-16 15:57:40,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 15:57:42,147 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:57:42,147 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 15:57:46,775 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:57:46,775 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [297439157] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 15:57:46,775 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [20612437] [2022-11-16 15:57:46,776 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 15:57:46,777 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 15:57:46,777 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 15:57:46,777 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 15:57:46,777 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 15:57:46,854 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 15:57:47,808 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20848#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 15:57:47,808 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 15:57:47,808 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 15:57:47,809 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 46, 46] total 113 [2022-11-16 15:57:47,809 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1759891670] [2022-11-16 15:57:47,809 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 15:57:47,809 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 113 states [2022-11-16 15:57:47,810 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 15:57:47,810 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2022-11-16 15:57:47,811 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1854, Invalid=12188, Unknown=0, NotChecked=0, Total=14042 [2022-11-16 15:57:47,811 INFO L87 Difference]: Start difference. First operand 88 states and 89 transitions. Second operand has 113 states, 113 states have (on average 2.088495575221239) internal successors, (236), 113 states have internal predecessors, (236), 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) [2022-11-16 15:58:04,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 15:58:04,260 INFO L93 Difference]: Finished difference Result 242 states and 267 transitions. [2022-11-16 15:58:04,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2022-11-16 15:58:04,260 INFO L78 Accepts]: Start accepts. Automaton has has 113 states, 113 states have (on average 2.088495575221239) internal successors, (236), 113 states have internal predecessors, (236), 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 87 [2022-11-16 15:58:04,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 15:58:04,261 INFO L225 Difference]: With dead ends: 242 [2022-11-16 15:58:04,261 INFO L226 Difference]: Without dead ends: 174 [2022-11-16 15:58:04,263 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 394 GetRequests, 189 SyntacticMatches, 0 SemanticMatches, 205 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11315 ImplicationChecksByTransitivity, 20.6s TimeCoverageRelationStatistics Valid=5501, Invalid=37141, Unknown=0, NotChecked=0, Total=42642 [2022-11-16 15:58:04,263 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 501 mSDsluCounter, 497 mSDsCounter, 0 mSdLazyCounter, 4312 mSolverCounterSat, 577 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 501 SdHoareTripleChecker+Valid, 500 SdHoareTripleChecker+Invalid, 4889 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 577 IncrementalHoareTripleChecker+Valid, 4312 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2022-11-16 15:58:04,263 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [501 Valid, 500 Invalid, 4889 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [577 Valid, 4312 Invalid, 0 Unknown, 0 Unchecked, 2.8s Time] [2022-11-16 15:58:04,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2022-11-16 15:58:04,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 113. [2022-11-16 15:58:04,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 112 states have (on average 1.2053571428571428) internal successors, (135), 112 states have internal predecessors, (135), 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) [2022-11-16 15:58:04,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 135 transitions. [2022-11-16 15:58:04,536 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 135 transitions. Word has length 87 [2022-11-16 15:58:04,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 15:58:04,536 INFO L495 AbstractCegarLoop]: Abstraction has 113 states and 135 transitions. [2022-11-16 15:58:04,536 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 113 states, 113 states have (on average 2.088495575221239) internal successors, (236), 113 states have internal predecessors, (236), 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) [2022-11-16 15:58:04,536 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 135 transitions. [2022-11-16 15:58:04,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2022-11-16 15:58:04,537 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 15:58:04,537 INFO L195 NwaCegarLoop]: trace histogram [22, 22, 21, 21, 1, 1, 1, 1, 1] [2022-11-16 15:58:04,543 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2022-11-16 15:58:04,742 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2022-11-16 15:58:04,742 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 15:58:04,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 15:58:04,743 INFO L85 PathProgramCache]: Analyzing trace with hash 872395322, now seen corresponding path program 29 times [2022-11-16 15:58:04,743 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 15:58:04,743 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2004808070] [2022-11-16 15:58:04,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 15:58:04,743 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 15:58:04,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:58:07,602 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 590 proven. 335 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:58:07,602 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 15:58:07,602 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2004808070] [2022-11-16 15:58:07,603 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2004808070] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 15:58:07,603 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [147209584] [2022-11-16 15:58:07,603 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 15:58:07,603 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:58:07,603 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 15:58:07,606 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 15:58:07,608 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-11-16 15:58:07,728 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2022-11-16 15:58:07,728 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 15:58:07,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 80 conjunts are in the unsatisfiable core [2022-11-16 15:58:07,734 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 15:58:11,459 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 0 proven. 925 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:58:11,460 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 15:58:17,147 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 0 proven. 925 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:58:17,147 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [147209584] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 15:58:17,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1121338310] [2022-11-16 15:58:17,149 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 15:58:17,149 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 15:58:17,150 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 15:58:17,150 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 15:58:17,150 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 15:58:17,242 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 15:58:18,400 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22328#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 15:58:18,400 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 15:58:18,400 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 15:58:18,400 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 50, 50] total 144 [2022-11-16 15:58:18,401 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [865937590] [2022-11-16 15:58:18,401 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 15:58:18,401 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 144 states [2022-11-16 15:58:18,401 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 15:58:18,402 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 144 interpolants. [2022-11-16 15:58:18,404 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2429, Invalid=19921, Unknown=0, NotChecked=0, Total=22350 [2022-11-16 15:58:18,404 INFO L87 Difference]: Start difference. First operand 113 states and 135 transitions. Second operand has 144 states, 144 states have (on average 1.8611111111111112) internal successors, (268), 144 states have internal predecessors, (268), 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) [2022-11-16 15:58:32,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 15:58:32,044 INFO L93 Difference]: Finished difference Result 187 states and 210 transitions. [2022-11-16 15:58:32,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2022-11-16 15:58:32,044 INFO L78 Accepts]: Start accepts. Automaton has has 144 states, 144 states have (on average 1.8611111111111112) internal successors, (268), 144 states have internal predecessors, (268), 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 91 [2022-11-16 15:58:32,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 15:58:32,045 INFO L225 Difference]: With dead ends: 187 [2022-11-16 15:58:32,045 INFO L226 Difference]: Without dead ends: 116 [2022-11-16 15:58:32,046 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 368 GetRequests, 172 SyntacticMatches, 0 SemanticMatches, 196 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10359 ImplicationChecksByTransitivity, 22.4s TimeCoverageRelationStatistics Valid=4315, Invalid=34691, Unknown=0, NotChecked=0, Total=39006 [2022-11-16 15:58:32,047 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 195 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 2236 mSolverCounterSat, 421 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 195 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 2657 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 421 IncrementalHoareTripleChecker+Valid, 2236 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-11-16 15:58:32,047 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [195 Valid, 84 Invalid, 2657 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [421 Valid, 2236 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-11-16 15:58:32,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2022-11-16 15:58:32,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 113. [2022-11-16 15:58:32,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 112 states have (on average 1.1964285714285714) internal successors, (134), 112 states have internal predecessors, (134), 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) [2022-11-16 15:58:32,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 134 transitions. [2022-11-16 15:58:32,283 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 134 transitions. Word has length 91 [2022-11-16 15:58:32,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 15:58:32,283 INFO L495 AbstractCegarLoop]: Abstraction has 113 states and 134 transitions. [2022-11-16 15:58:32,283 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 144 states, 144 states have (on average 1.8611111111111112) internal successors, (268), 144 states have internal predecessors, (268), 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) [2022-11-16 15:58:32,283 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 134 transitions. [2022-11-16 15:58:32,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2022-11-16 15:58:32,283 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 15:58:32,284 INFO L195 NwaCegarLoop]: trace histogram [23, 22, 21, 21, 1, 1, 1, 1, 1] [2022-11-16 15:58:32,292 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2022-11-16 15:58:32,484 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2022-11-16 15:58:32,484 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 15:58:32,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 15:58:32,485 INFO L85 PathProgramCache]: Analyzing trace with hash 744959578, now seen corresponding path program 30 times [2022-11-16 15:58:32,485 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 15:58:32,485 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1620121735] [2022-11-16 15:58:32,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 15:58:32,485 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 15:58:32,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:58:33,766 INFO L134 CoverageAnalysis]: Checked inductivity of 948 backedges. 231 proven. 717 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:58:33,766 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 15:58:33,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1620121735] [2022-11-16 15:58:33,766 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1620121735] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 15:58:33,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [727892462] [2022-11-16 15:58:33,766 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 15:58:33,767 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:58:33,767 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 15:58:33,767 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 15:58:33,770 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-11-16 15:58:33,861 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 15:58:33,861 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 15:58:33,864 INFO L263 TraceCheckSpWp]: Trace formula consists of 364 conjuncts, 75 conjunts are in the unsatisfiable core [2022-11-16 15:58:33,866 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 15:58:35,065 INFO L134 CoverageAnalysis]: Checked inductivity of 948 backedges. 0 proven. 948 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:58:35,065 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 15:58:36,572 INFO L134 CoverageAnalysis]: Checked inductivity of 948 backedges. 0 proven. 948 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:58:36,572 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [727892462] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 15:58:36,572 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [607856272] [2022-11-16 15:58:36,575 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 15:58:36,575 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 15:58:36,576 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 15:58:36,576 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 15:58:36,576 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 15:58:36,650 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 15:58:37,321 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23593#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 15:58:37,321 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 15:58:37,322 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 15:58:37,322 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 95 [2022-11-16 15:58:37,322 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1471985479] [2022-11-16 15:58:37,322 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 15:58:37,322 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 95 states [2022-11-16 15:58:37,322 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 15:58:37,323 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2022-11-16 15:58:37,324 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1480, Invalid=8620, Unknown=0, NotChecked=0, Total=10100 [2022-11-16 15:58:37,324 INFO L87 Difference]: Start difference. First operand 113 states and 134 transitions. Second operand has 95 states, 95 states have (on average 1.4947368421052631) internal successors, (142), 95 states have internal predecessors, (142), 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) [2022-11-16 15:58:39,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 15:58:39,878 INFO L93 Difference]: Finished difference Result 186 states and 208 transitions. [2022-11-16 15:58:39,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2022-11-16 15:58:39,879 INFO L78 Accepts]: Start accepts. Automaton has has 95 states, 95 states have (on average 1.4947368421052631) internal successors, (142), 95 states have internal predecessors, (142), 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 92 [2022-11-16 15:58:39,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 15:58:39,879 INFO L225 Difference]: With dead ends: 186 [2022-11-16 15:58:39,879 INFO L226 Difference]: Without dead ends: 184 [2022-11-16 15:58:39,880 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 368 GetRequests, 201 SyntacticMatches, 22 SemanticMatches, 145 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7205 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=3523, Invalid=17939, Unknown=0, NotChecked=0, Total=21462 [2022-11-16 15:58:39,881 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 319 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 1057 mSolverCounterSat, 175 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 319 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 1232 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 175 IncrementalHoareTripleChecker+Valid, 1057 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-16 15:58:39,881 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [319 Valid, 73 Invalid, 1232 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [175 Valid, 1057 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-16 15:58:39,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2022-11-16 15:58:40,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 96. [2022-11-16 15:58:40,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 95 states have (on average 1.0210526315789474) internal successors, (97), 95 states have internal predecessors, (97), 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) [2022-11-16 15:58:40,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 97 transitions. [2022-11-16 15:58:40,061 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 97 transitions. Word has length 92 [2022-11-16 15:58:40,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 15:58:40,061 INFO L495 AbstractCegarLoop]: Abstraction has 96 states and 97 transitions. [2022-11-16 15:58:40,061 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 95 states, 95 states have (on average 1.4947368421052631) internal successors, (142), 95 states have internal predecessors, (142), 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) [2022-11-16 15:58:40,061 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 97 transitions. [2022-11-16 15:58:40,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2022-11-16 15:58:40,062 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 15:58:40,062 INFO L195 NwaCegarLoop]: trace histogram [23, 23, 22, 22, 1, 1, 1, 1, 1] [2022-11-16 15:58:40,067 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2022-11-16 15:58:40,262 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2022-11-16 15:58:40,262 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 15:58:40,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 15:58:40,263 INFO L85 PathProgramCache]: Analyzing trace with hash 999595012, now seen corresponding path program 31 times [2022-11-16 15:58:40,263 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 15:58:40,263 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1121762050] [2022-11-16 15:58:40,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 15:58:40,263 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 15:58:40,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:58:43,373 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 651 proven. 362 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:58:43,373 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 15:58:43,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1121762050] [2022-11-16 15:58:43,374 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1121762050] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 15:58:43,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1776605975] [2022-11-16 15:58:43,374 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 15:58:43,374 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:58:43,375 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 15:58:43,377 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 15:58:43,379 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-11-16 15:58:43,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:58:43,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 374 conjuncts, 100 conjunts are in the unsatisfiable core [2022-11-16 15:58:43,474 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 15:58:45,640 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 0 proven. 1013 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:58:45,640 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 15:58:51,088 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 0 proven. 1013 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:58:51,088 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1776605975] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 15:58:51,088 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [394208908] [2022-11-16 15:58:51,089 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 15:58:51,089 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 15:58:51,090 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 15:58:51,090 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 15:58:51,090 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 15:58:51,162 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 15:58:52,175 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24862#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 15:58:52,176 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 15:58:52,176 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 15:58:52,176 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 50, 50] total 123 [2022-11-16 15:58:52,176 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1354384354] [2022-11-16 15:58:52,176 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 15:58:52,176 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 123 states [2022-11-16 15:58:52,177 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 15:58:52,177 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 123 interpolants. [2022-11-16 15:58:52,179 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2187, Invalid=14325, Unknown=0, NotChecked=0, Total=16512 [2022-11-16 15:58:52,179 INFO L87 Difference]: Start difference. First operand 96 states and 97 transitions. Second operand has 123 states, 123 states have (on average 2.097560975609756) internal successors, (258), 123 states have internal predecessors, (258), 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) [2022-11-16 15:59:12,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 15:59:12,193 INFO L93 Difference]: Finished difference Result 264 states and 291 transitions. [2022-11-16 15:59:12,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2022-11-16 15:59:12,193 INFO L78 Accepts]: Start accepts. Automaton has has 123 states, 123 states have (on average 2.097560975609756) internal successors, (258), 123 states have internal predecessors, (258), 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 95 [2022-11-16 15:59:12,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 15:59:12,194 INFO L225 Difference]: With dead ends: 264 [2022-11-16 15:59:12,194 INFO L226 Difference]: Without dead ends: 190 [2022-11-16 15:59:12,196 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 207 SyntacticMatches, 0 SemanticMatches, 223 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13403 ImplicationChecksByTransitivity, 24.6s TimeCoverageRelationStatistics Valid=6500, Invalid=43900, Unknown=0, NotChecked=0, Total=50400 [2022-11-16 15:59:12,196 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 574 mSDsluCounter, 592 mSDsCounter, 0 mSdLazyCounter, 5279 mSolverCounterSat, 678 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 574 SdHoareTripleChecker+Valid, 595 SdHoareTripleChecker+Invalid, 5957 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 678 IncrementalHoareTripleChecker+Valid, 5279 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2022-11-16 15:59:12,197 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [574 Valid, 595 Invalid, 5957 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [678 Valid, 5279 Invalid, 0 Unknown, 0 Unchecked, 3.4s Time] [2022-11-16 15:59:12,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2022-11-16 15:59:12,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 123. [2022-11-16 15:59:12,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 122 states have (on average 1.2049180327868851) internal successors, (147), 122 states have internal predecessors, (147), 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) [2022-11-16 15:59:12,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 147 transitions. [2022-11-16 15:59:12,466 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 147 transitions. Word has length 95 [2022-11-16 15:59:12,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 15:59:12,466 INFO L495 AbstractCegarLoop]: Abstraction has 123 states and 147 transitions. [2022-11-16 15:59:12,466 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 123 states, 123 states have (on average 2.097560975609756) internal successors, (258), 123 states have internal predecessors, (258), 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) [2022-11-16 15:59:12,467 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 147 transitions. [2022-11-16 15:59:12,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2022-11-16 15:59:12,467 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 15:59:12,467 INFO L195 NwaCegarLoop]: trace histogram [24, 24, 23, 23, 1, 1, 1, 1, 1] [2022-11-16 15:59:12,472 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2022-11-16 15:59:12,668 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2022-11-16 15:59:12,668 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 15:59:12,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 15:59:12,669 INFO L85 PathProgramCache]: Analyzing trace with hash -1766066694, now seen corresponding path program 32 times [2022-11-16 15:59:12,669 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 15:59:12,669 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [505362319] [2022-11-16 15:59:12,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 15:59:12,669 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 15:59:12,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:59:15,847 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 715 proven. 390 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:59:15,847 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 15:59:15,847 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [505362319] [2022-11-16 15:59:15,847 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [505362319] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 15:59:15,847 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [967353914] [2022-11-16 15:59:15,848 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 15:59:15,848 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:59:15,848 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 15:59:15,849 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 15:59:15,852 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-11-16 15:59:15,984 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2022-11-16 15:59:15,984 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 15:59:15,987 INFO L263 TraceCheckSpWp]: Trace formula consists of 389 conjuncts, 92 conjunts are in the unsatisfiable core [2022-11-16 15:59:15,990 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 15:59:20,777 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 0 proven. 1105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:59:20,777 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 15:59:27,736 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 0 proven. 1105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:59:27,737 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [967353914] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 15:59:27,737 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1850629114] [2022-11-16 15:59:27,738 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 15:59:27,738 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 15:59:27,739 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 15:59:27,739 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 15:59:27,739 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 15:59:27,804 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 15:59:28,902 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26478#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 15:59:28,902 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 15:59:28,903 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 15:59:28,903 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 56, 56] total 160 [2022-11-16 15:59:28,903 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1054454394] [2022-11-16 15:59:28,903 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 15:59:28,904 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 160 states [2022-11-16 15:59:28,904 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 15:59:28,905 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 160 interpolants. [2022-11-16 15:59:28,906 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2962, Invalid=24428, Unknown=0, NotChecked=0, Total=27390 [2022-11-16 15:59:28,906 INFO L87 Difference]: Start difference. First operand 123 states and 147 transitions. Second operand has 160 states, 160 states have (on average 1.825) internal successors, (292), 160 states have internal predecessors, (292), 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) [2022-11-16 15:59:45,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 15:59:45,887 INFO L93 Difference]: Finished difference Result 203 states and 228 transitions. [2022-11-16 15:59:45,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2022-11-16 15:59:45,887 INFO L78 Accepts]: Start accepts. Automaton has has 160 states, 160 states have (on average 1.825) internal successors, (292), 160 states have internal predecessors, (292), 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 99 [2022-11-16 15:59:45,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 15:59:45,888 INFO L225 Difference]: With dead ends: 203 [2022-11-16 15:59:45,888 INFO L226 Difference]: Without dead ends: 126 [2022-11-16 15:59:45,890 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 401 GetRequests, 184 SyntacticMatches, 0 SemanticMatches, 217 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13007 ImplicationChecksByTransitivity, 27.4s TimeCoverageRelationStatistics Valid=5256, Invalid=42486, Unknown=0, NotChecked=0, Total=47742 [2022-11-16 15:59:45,891 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 334 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 3224 mSolverCounterSat, 460 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 334 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 3684 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 460 IncrementalHoareTripleChecker+Valid, 3224 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2022-11-16 15:59:45,891 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [334 Valid, 104 Invalid, 3684 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [460 Valid, 3224 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2022-11-16 15:59:45,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2022-11-16 15:59:46,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 123. [2022-11-16 15:59:46,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 122 states have (on average 1.1967213114754098) internal successors, (146), 122 states have internal predecessors, (146), 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) [2022-11-16 15:59:46,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 146 transitions. [2022-11-16 15:59:46,190 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 146 transitions. Word has length 99 [2022-11-16 15:59:46,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 15:59:46,190 INFO L495 AbstractCegarLoop]: Abstraction has 123 states and 146 transitions. [2022-11-16 15:59:46,190 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 160 states, 160 states have (on average 1.825) internal successors, (292), 160 states have internal predecessors, (292), 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) [2022-11-16 15:59:46,191 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 146 transitions. [2022-11-16 15:59:46,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2022-11-16 15:59:46,191 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 15:59:46,191 INFO L195 NwaCegarLoop]: trace histogram [25, 24, 23, 23, 1, 1, 1, 1, 1] [2022-11-16 15:59:46,202 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2022-11-16 15:59:46,397 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2022-11-16 15:59:46,397 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 15:59:46,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 15:59:46,397 INFO L85 PathProgramCache]: Analyzing trace with hash -428518886, now seen corresponding path program 33 times [2022-11-16 15:59:46,397 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 15:59:46,397 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [265858443] [2022-11-16 15:59:46,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 15:59:46,398 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 15:59:46,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:59:47,950 INFO L134 CoverageAnalysis]: Checked inductivity of 1130 backedges. 276 proven. 854 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:59:47,950 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 15:59:47,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [265858443] [2022-11-16 15:59:47,951 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [265858443] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 15:59:47,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [228518898] [2022-11-16 15:59:47,951 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 15:59:47,951 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:59:47,951 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 15:59:47,952 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 15:59:47,954 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-11-16 15:59:48,049 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 15:59:48,049 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 15:59:48,052 INFO L263 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 81 conjunts are in the unsatisfiable core [2022-11-16 15:59:48,054 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 15:59:49,426 INFO L134 CoverageAnalysis]: Checked inductivity of 1130 backedges. 0 proven. 1130 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:59:49,426 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 15:59:51,196 INFO L134 CoverageAnalysis]: Checked inductivity of 1130 backedges. 0 proven. 1130 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:59:51,196 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [228518898] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 15:59:51,196 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1719605369] [2022-11-16 15:59:51,197 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 15:59:51,197 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 15:59:51,197 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 15:59:51,197 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 15:59:51,197 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 15:59:51,277 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 15:59:52,112 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '27855#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 15:59:52,112 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 15:59:52,112 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 15:59:52,112 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 103 [2022-11-16 15:59:52,112 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [277274496] [2022-11-16 15:59:52,112 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 15:59:52,113 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 103 states [2022-11-16 15:59:52,113 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 15:59:52,114 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2022-11-16 15:59:52,115 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1731, Invalid=10041, Unknown=0, NotChecked=0, Total=11772 [2022-11-16 15:59:52,115 INFO L87 Difference]: Start difference. First operand 123 states and 146 transitions. Second operand has 103 states, 103 states have (on average 1.4951456310679612) internal successors, (154), 103 states have internal predecessors, (154), 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) [2022-11-16 15:59:55,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 15:59:55,112 INFO L93 Difference]: Finished difference Result 202 states and 226 transitions. [2022-11-16 15:59:55,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2022-11-16 15:59:55,113 INFO L78 Accepts]: Start accepts. Automaton has has 103 states, 103 states have (on average 1.4951456310679612) internal successors, (154), 103 states have internal predecessors, (154), 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 100 [2022-11-16 15:59:55,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 15:59:55,114 INFO L225 Difference]: With dead ends: 202 [2022-11-16 15:59:55,114 INFO L226 Difference]: Without dead ends: 200 [2022-11-16 15:59:55,115 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 400 GetRequests, 219 SyntacticMatches, 24 SemanticMatches, 157 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8483 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=4127, Invalid=20995, Unknown=0, NotChecked=0, Total=25122 [2022-11-16 15:59:55,116 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 385 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 1175 mSolverCounterSat, 215 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 385 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 1390 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 215 IncrementalHoareTripleChecker+Valid, 1175 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-16 15:59:55,116 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [385 Valid, 73 Invalid, 1390 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [215 Valid, 1175 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-16 15:59:55,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2022-11-16 15:59:55,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 104. [2022-11-16 15:59:55,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 103 states have (on average 1.0194174757281553) internal successors, (105), 103 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) [2022-11-16 15:59:55,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 105 transitions. [2022-11-16 15:59:55,326 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 105 transitions. Word has length 100 [2022-11-16 15:59:55,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 15:59:55,327 INFO L495 AbstractCegarLoop]: Abstraction has 104 states and 105 transitions. [2022-11-16 15:59:55,327 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 103 states, 103 states have (on average 1.4951456310679612) internal successors, (154), 103 states have internal predecessors, (154), 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) [2022-11-16 15:59:55,327 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 105 transitions. [2022-11-16 15:59:55,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2022-11-16 15:59:55,328 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 15:59:55,328 INFO L195 NwaCegarLoop]: trace histogram [25, 25, 24, 24, 1, 1, 1, 1, 1] [2022-11-16 15:59:55,338 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2022-11-16 15:59:55,538 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:59:55,538 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 15:59:55,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 15:59:55,538 INFO L85 PathProgramCache]: Analyzing trace with hash -1358503868, now seen corresponding path program 34 times [2022-11-16 15:59:55,539 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 15:59:55,539 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1852627699] [2022-11-16 15:59:55,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 15:59:55,539 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 15:59:55,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:59:58,968 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 782 proven. 419 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 15:59:58,969 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 15:59:58,969 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1852627699] [2022-11-16 15:59:58,969 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1852627699] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 15:59:58,969 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [347012917] [2022-11-16 15:59:58,969 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 15:59:58,969 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 15:59:58,969 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 15:59:58,970 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 15:59:58,972 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-11-16 15:59:59,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 15:59:59,067 INFO L263 TraceCheckSpWp]: Trace formula consists of 404 conjuncts, 108 conjunts are in the unsatisfiable core [2022-11-16 15:59:59,069 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 16:00:01,518 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 0 proven. 1201 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 16:00:01,518 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 16:00:07,701 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 0 proven. 1201 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 16:00:07,701 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [347012917] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 16:00:07,701 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2011456308] [2022-11-16 16:00:07,702 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 16:00:07,702 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 16:00:07,702 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 16:00:07,702 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 16:00:07,703 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 16:00:07,774 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 16:00:08,845 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '29232#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 16:00:08,846 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 16:00:08,846 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 16:00:08,846 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 54, 54] total 133 [2022-11-16 16:00:08,846 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [697950920] [2022-11-16 16:00:08,846 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 16:00:08,847 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 133 states [2022-11-16 16:00:08,847 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 16:00:08,848 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 133 interpolants. [2022-11-16 16:00:08,849 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2548, Invalid=16634, Unknown=0, NotChecked=0, Total=19182 [2022-11-16 16:00:08,849 INFO L87 Difference]: Start difference. First operand 104 states and 105 transitions. Second operand has 133 states, 133 states have (on average 2.1052631578947367) internal successors, (280), 133 states have internal predecessors, (280), 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) [2022-11-16 16:00:32,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 16:00:32,263 INFO L93 Difference]: Finished difference Result 286 states and 315 transitions. [2022-11-16 16:00:32,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 134 states. [2022-11-16 16:00:32,264 INFO L78 Accepts]: Start accepts. Automaton has has 133 states, 133 states have (on average 2.1052631578947367) internal successors, (280), 133 states have internal predecessors, (280), 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 103 [2022-11-16 16:00:32,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 16:00:32,265 INFO L225 Difference]: With dead ends: 286 [2022-11-16 16:00:32,265 INFO L226 Difference]: Without dead ends: 206 [2022-11-16 16:00:32,269 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 466 GetRequests, 225 SyntacticMatches, 0 SemanticMatches, 241 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15667 ImplicationChecksByTransitivity, 28.6s TimeCoverageRelationStatistics Valid=7583, Invalid=51223, Unknown=0, NotChecked=0, Total=58806 [2022-11-16 16:00:32,269 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 638 mSDsluCounter, 687 mSDsCounter, 0 mSdLazyCounter, 6106 mSolverCounterSat, 812 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 638 SdHoareTripleChecker+Valid, 690 SdHoareTripleChecker+Invalid, 6918 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 812 IncrementalHoareTripleChecker+Valid, 6106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.9s IncrementalHoareTripleChecker+Time [2022-11-16 16:00:32,270 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [638 Valid, 690 Invalid, 6918 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [812 Valid, 6106 Invalid, 0 Unknown, 0 Unchecked, 3.9s Time] [2022-11-16 16:00:32,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2022-11-16 16:00:32,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 133. [2022-11-16 16:00:32,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 132 states have (on average 1.2045454545454546) internal successors, (159), 132 states have internal predecessors, (159), 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) [2022-11-16 16:00:32,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 159 transitions. [2022-11-16 16:00:32,614 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 159 transitions. Word has length 103 [2022-11-16 16:00:32,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 16:00:32,614 INFO L495 AbstractCegarLoop]: Abstraction has 133 states and 159 transitions. [2022-11-16 16:00:32,614 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 133 states, 133 states have (on average 2.1052631578947367) internal successors, (280), 133 states have internal predecessors, (280), 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) [2022-11-16 16:00:32,614 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 159 transitions. [2022-11-16 16:00:32,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2022-11-16 16:00:32,615 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 16:00:32,615 INFO L195 NwaCegarLoop]: trace histogram [26, 26, 25, 25, 1, 1, 1, 1, 1] [2022-11-16 16:00:32,623 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2022-11-16 16:00:32,820 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2022-11-16 16:00:32,821 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 16:00:32,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 16:00:32,821 INFO L85 PathProgramCache]: Analyzing trace with hash 937585082, now seen corresponding path program 35 times [2022-11-16 16:00:32,821 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 16:00:32,821 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [137515280] [2022-11-16 16:00:32,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:00:32,821 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 16:00:32,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 16:00:36,470 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 852 proven. 449 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 16:00:36,470 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 16:00:36,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [137515280] [2022-11-16 16:00:36,471 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [137515280] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 16:00:36,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [859005230] [2022-11-16 16:00:36,471 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 16:00:36,471 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:00:36,471 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 16:00:36,472 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 16:00:36,474 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-11-16 16:00:36,614 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2022-11-16 16:00:36,614 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 16:00:36,617 INFO L263 TraceCheckSpWp]: Trace formula consists of 419 conjuncts, 92 conjunts are in the unsatisfiable core [2022-11-16 16:00:36,620 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 16:00:41,553 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 16:00:41,553 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 16:00:49,036 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 16:00:49,036 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [859005230] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 16:00:49,037 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [340173484] [2022-11-16 16:00:49,037 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 16:00:49,038 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 16:00:49,038 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 16:00:49,038 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 16:00:49,038 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 16:00:49,119 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 16:00:50,435 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30976#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 16:00:50,436 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 16:00:50,436 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 16:00:50,436 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 58, 58] total 168 [2022-11-16 16:00:50,436 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [822777488] [2022-11-16 16:00:50,436 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 16:00:50,436 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 168 states [2022-11-16 16:00:50,436 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 16:00:50,437 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 168 interpolants. [2022-11-16 16:00:50,438 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3273, Invalid=26829, Unknown=0, NotChecked=0, Total=30102 [2022-11-16 16:00:50,439 INFO L87 Difference]: Start difference. First operand 133 states and 159 transitions. Second operand has 168 states, 168 states have (on average 1.880952380952381) internal successors, (316), 168 states have internal predecessors, (316), 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) [2022-11-16 16:01:09,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 16:01:09,966 INFO L93 Difference]: Finished difference Result 219 states and 246 transitions. [2022-11-16 16:01:09,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2022-11-16 16:01:09,967 INFO L78 Accepts]: Start accepts. Automaton has has 168 states, 168 states have (on average 1.880952380952381) internal successors, (316), 168 states have internal predecessors, (316), 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 107 [2022-11-16 16:01:09,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 16:01:09,968 INFO L225 Difference]: With dead ends: 219 [2022-11-16 16:01:09,968 INFO L226 Difference]: Without dead ends: 136 [2022-11-16 16:01:09,970 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 432 GetRequests, 204 SyntacticMatches, 0 SemanticMatches, 228 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13995 ImplicationChecksByTransitivity, 31.1s TimeCoverageRelationStatistics Valid=5807, Invalid=46863, Unknown=0, NotChecked=0, Total=52670 [2022-11-16 16:01:09,971 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 252 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 3432 mSolverCounterSat, 468 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 252 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 3900 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 468 IncrementalHoareTripleChecker+Valid, 3432 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2022-11-16 16:01:09,971 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [252 Valid, 111 Invalid, 3900 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [468 Valid, 3432 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2022-11-16 16:01:09,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2022-11-16 16:01:10,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 133. [2022-11-16 16:01:10,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 132 states have (on average 1.196969696969697) internal successors, (158), 132 states have internal predecessors, (158), 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) [2022-11-16 16:01:10,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 158 transitions. [2022-11-16 16:01:10,325 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 158 transitions. Word has length 107 [2022-11-16 16:01:10,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 16:01:10,325 INFO L495 AbstractCegarLoop]: Abstraction has 133 states and 158 transitions. [2022-11-16 16:01:10,325 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 168 states, 168 states have (on average 1.880952380952381) internal successors, (316), 168 states have internal predecessors, (316), 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) [2022-11-16 16:01:10,325 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 158 transitions. [2022-11-16 16:01:10,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2022-11-16 16:01:10,326 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 16:01:10,326 INFO L195 NwaCegarLoop]: trace histogram [27, 26, 25, 25, 1, 1, 1, 1, 1] [2022-11-16 16:01:10,330 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2022-11-16 16:01:10,526 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2022-11-16 16:01:10,527 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 16:01:10,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 16:01:10,527 INFO L85 PathProgramCache]: Analyzing trace with hash -552753702, now seen corresponding path program 36 times [2022-11-16 16:01:10,527 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 16:01:10,527 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1333622777] [2022-11-16 16:01:10,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:01:10,527 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 16:01:10,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 16:01:12,271 INFO L134 CoverageAnalysis]: Checked inductivity of 1328 backedges. 325 proven. 1003 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 16:01:12,271 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 16:01:12,271 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1333622777] [2022-11-16 16:01:12,271 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1333622777] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 16:01:12,271 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [961571236] [2022-11-16 16:01:12,271 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 16:01:12,272 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:01:12,272 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 16:01:12,273 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 16:01:12,275 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-11-16 16:01:12,375 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 16:01:12,375 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 16:01:12,379 INFO L263 TraceCheckSpWp]: Trace formula consists of 424 conjuncts, 87 conjunts are in the unsatisfiable core [2022-11-16 16:01:12,381 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 16:01:13,965 INFO L134 CoverageAnalysis]: Checked inductivity of 1328 backedges. 0 proven. 1328 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 16:01:13,965 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 16:01:15,976 INFO L134 CoverageAnalysis]: Checked inductivity of 1328 backedges. 0 proven. 1328 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 16:01:15,976 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [961571236] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 16:01:15,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [677221511] [2022-11-16 16:01:15,977 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 16:01:15,977 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 16:01:15,978 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 16:01:15,978 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 16:01:15,978 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 16:01:16,054 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 16:01:16,941 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '32461#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 16:01:16,941 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 16:01:16,941 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 16:01:16,941 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 111 [2022-11-16 16:01:16,942 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [102661652] [2022-11-16 16:01:16,942 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 16:01:16,942 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 111 states [2022-11-16 16:01:16,942 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 16:01:16,943 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 111 interpolants. [2022-11-16 16:01:16,943 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2002, Invalid=11570, Unknown=0, NotChecked=0, Total=13572 [2022-11-16 16:01:16,944 INFO L87 Difference]: Start difference. First operand 133 states and 158 transitions. Second operand has 111 states, 111 states have (on average 1.4954954954954955) internal successors, (166), 111 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) [2022-11-16 16:01:20,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 16:01:20,324 INFO L93 Difference]: Finished difference Result 218 states and 244 transitions. [2022-11-16 16:01:20,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2022-11-16 16:01:20,325 INFO L78 Accepts]: Start accepts. Automaton has has 111 states, 111 states have (on average 1.4954954954954955) internal successors, (166), 111 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 108 [2022-11-16 16:01:20,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 16:01:20,325 INFO L225 Difference]: With dead ends: 218 [2022-11-16 16:01:20,325 INFO L226 Difference]: Without dead ends: 216 [2022-11-16 16:01:20,326 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 432 GetRequests, 237 SyntacticMatches, 26 SemanticMatches, 169 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9865 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=4779, Invalid=24291, Unknown=0, NotChecked=0, Total=29070 [2022-11-16 16:01:20,327 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 414 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 1357 mSolverCounterSat, 223 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 414 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 1580 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 223 IncrementalHoareTripleChecker+Valid, 1357 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-16 16:01:20,327 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [414 Valid, 78 Invalid, 1580 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [223 Valid, 1357 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-16 16:01:20,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2022-11-16 16:01:20,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 112. [2022-11-16 16:01:20,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 111 states have (on average 1.018018018018018) internal successors, (113), 111 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) [2022-11-16 16:01:20,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 113 transitions. [2022-11-16 16:01:20,724 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 113 transitions. Word has length 108 [2022-11-16 16:01:20,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 16:01:20,725 INFO L495 AbstractCegarLoop]: Abstraction has 112 states and 113 transitions. [2022-11-16 16:01:20,725 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 111 states, 111 states have (on average 1.4954954954954955) internal successors, (166), 111 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) [2022-11-16 16:01:20,725 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 113 transitions. [2022-11-16 16:01:20,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2022-11-16 16:01:20,726 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 16:01:20,726 INFO L195 NwaCegarLoop]: trace histogram [27, 27, 26, 26, 1, 1, 1, 1, 1] [2022-11-16 16:01:20,740 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2022-11-16 16:01:20,931 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-11-16 16:01:20,932 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 16:01:20,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 16:01:20,932 INFO L85 PathProgramCache]: Analyzing trace with hash -176098172, now seen corresponding path program 37 times [2022-11-16 16:01:20,932 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 16:01:20,932 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1838300263] [2022-11-16 16:01:20,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:01:20,932 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 16:01:20,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 16:01:24,842 INFO L134 CoverageAnalysis]: Checked inductivity of 1405 backedges. 925 proven. 480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 16:01:24,842 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 16:01:24,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1838300263] [2022-11-16 16:01:24,842 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1838300263] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 16:01:24,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2057595686] [2022-11-16 16:01:24,842 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 16:01:24,843 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:01:24,843 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 16:01:24,843 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 16:01:24,847 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2022-11-16 16:01:24,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 16:01:24,955 INFO L263 TraceCheckSpWp]: Trace formula consists of 434 conjuncts, 116 conjunts are in the unsatisfiable core [2022-11-16 16:01:24,959 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 16:01:27,778 INFO L134 CoverageAnalysis]: Checked inductivity of 1405 backedges. 0 proven. 1405 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 16:01:27,778 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 16:01:34,807 INFO L134 CoverageAnalysis]: Checked inductivity of 1405 backedges. 0 proven. 1405 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 16:01:34,807 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2057595686] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 16:01:34,807 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1190490362] [2022-11-16 16:01:34,808 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 16:01:34,808 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 16:01:34,808 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 16:01:34,809 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 16:01:34,809 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 16:01:34,871 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 16:01:36,010 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '33946#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 16:01:36,010 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 16:01:36,010 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 16:01:36,010 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 58, 58] total 143 [2022-11-16 16:01:36,010 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1369779020] [2022-11-16 16:01:36,011 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 16:01:36,011 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 143 states [2022-11-16 16:01:36,011 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 16:01:36,012 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 143 interpolants. [2022-11-16 16:01:36,013 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2937, Invalid=19115, Unknown=0, NotChecked=0, Total=22052 [2022-11-16 16:01:36,014 INFO L87 Difference]: Start difference. First operand 112 states and 113 transitions. Second operand has 143 states, 143 states have (on average 2.111888111888112) internal successors, (302), 143 states have internal predecessors, (302), 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) [2022-11-16 16:02:03,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 16:02:03,436 INFO L93 Difference]: Finished difference Result 308 states and 339 transitions. [2022-11-16 16:02:03,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 144 states. [2022-11-16 16:02:03,437 INFO L78 Accepts]: Start accepts. Automaton has has 143 states, 143 states have (on average 2.111888111888112) internal successors, (302), 143 states have internal predecessors, (302), 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 111 [2022-11-16 16:02:03,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 16:02:03,438 INFO L225 Difference]: With dead ends: 308 [2022-11-16 16:02:03,438 INFO L226 Difference]: Without dead ends: 222 [2022-11-16 16:02:03,441 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 502 GetRequests, 243 SyntacticMatches, 0 SemanticMatches, 259 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18107 ImplicationChecksByTransitivity, 33.4s TimeCoverageRelationStatistics Valid=8750, Invalid=59110, Unknown=0, NotChecked=0, Total=67860 [2022-11-16 16:02:03,441 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 709 mSDsluCounter, 799 mSDsCounter, 0 mSdLazyCounter, 6977 mSolverCounterSat, 930 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 709 SdHoareTripleChecker+Valid, 802 SdHoareTripleChecker+Invalid, 7907 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 930 IncrementalHoareTripleChecker+Valid, 6977 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.5s IncrementalHoareTripleChecker+Time [2022-11-16 16:02:03,441 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [709 Valid, 802 Invalid, 7907 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [930 Valid, 6977 Invalid, 0 Unknown, 0 Unchecked, 4.5s Time] [2022-11-16 16:02:03,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2022-11-16 16:02:03,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 143. [2022-11-16 16:02:03,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 142 states have (on average 1.204225352112676) internal successors, (171), 142 states have internal predecessors, (171), 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) [2022-11-16 16:02:03,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 171 transitions. [2022-11-16 16:02:03,835 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 171 transitions. Word has length 111 [2022-11-16 16:02:03,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 16:02:03,835 INFO L495 AbstractCegarLoop]: Abstraction has 143 states and 171 transitions. [2022-11-16 16:02:03,835 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 143 states, 143 states have (on average 2.111888111888112) internal successors, (302), 143 states have internal predecessors, (302), 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) [2022-11-16 16:02:03,835 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 171 transitions. [2022-11-16 16:02:03,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2022-11-16 16:02:03,836 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 16:02:03,836 INFO L195 NwaCegarLoop]: trace histogram [28, 28, 27, 27, 1, 1, 1, 1, 1] [2022-11-16 16:02:03,844 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2022-11-16 16:02:04,036 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:02:04,037 INFO L420 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 16:02:04,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 16:02:04,037 INFO L85 PathProgramCache]: Analyzing trace with hash 1326386554, now seen corresponding path program 38 times [2022-11-16 16:02:04,037 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 16:02:04,037 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [18589086] [2022-11-16 16:02:04,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:02:04,037 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 16:02:04,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 16:02:08,224 INFO L134 CoverageAnalysis]: Checked inductivity of 1513 backedges. 1001 proven. 512 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 16:02:08,224 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 16:02:08,224 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [18589086] [2022-11-16 16:02:08,224 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [18589086] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 16:02:08,224 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [560008036] [2022-11-16 16:02:08,224 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 16:02:08,224 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:02:08,225 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 16:02:08,225 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 16:02:08,228 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-11-16 16:02:08,382 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2022-11-16 16:02:08,382 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 16:02:08,385 INFO L263 TraceCheckSpWp]: Trace formula consists of 449 conjuncts, 105 conjunts are in the unsatisfiable core [2022-11-16 16:02:08,387 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 16:02:14,587 INFO L134 CoverageAnalysis]: Checked inductivity of 1513 backedges. 0 proven. 1513 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 16:02:14,587 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 16:02:23,553 INFO L134 CoverageAnalysis]: Checked inductivity of 1513 backedges. 0 proven. 1513 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 16:02:23,554 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [560008036] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 16:02:23,554 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1843980492] [2022-11-16 16:02:23,555 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 16:02:23,555 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 16:02:23,555 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 16:02:23,555 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 16:02:23,556 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 16:02:23,635 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 16:02:24,864 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '35826#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 16:02:24,864 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 16:02:24,864 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 16:02:24,864 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 64, 64] total 184 [2022-11-16 16:02:24,864 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1287041009] [2022-11-16 16:02:24,864 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 16:02:24,865 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 184 states [2022-11-16 16:02:24,865 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 16:02:24,866 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 184 interpolants. [2022-11-16 16:02:24,868 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3887, Invalid=32023, Unknown=0, NotChecked=0, Total=35910 [2022-11-16 16:02:24,869 INFO L87 Difference]: Start difference. First operand 143 states and 171 transitions. Second operand has 184 states, 184 states have (on average 1.8478260869565217) internal successors, (340), 184 states have internal predecessors, (340), 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) [2022-11-16 16:02:49,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 16:02:49,372 INFO L93 Difference]: Finished difference Result 235 states and 264 transitions. [2022-11-16 16:02:49,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2022-11-16 16:02:49,372 INFO L78 Accepts]: Start accepts. Automaton has has 184 states, 184 states have (on average 1.8478260869565217) internal successors, (340), 184 states have internal predecessors, (340), 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 115 [2022-11-16 16:02:49,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 16:02:49,373 INFO L225 Difference]: With dead ends: 235 [2022-11-16 16:02:49,373 INFO L226 Difference]: Without dead ends: 146 [2022-11-16 16:02:49,377 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 466 GetRequests, 216 SyntacticMatches, 0 SemanticMatches, 250 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17215 ImplicationChecksByTransitivity, 37.9s TimeCoverageRelationStatistics Valid=6937, Invalid=56315, Unknown=0, NotChecked=0, Total=63252 [2022-11-16 16:02:49,378 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 345 mSDsluCounter, 128 mSDsCounter, 0 mSdLazyCounter, 4370 mSolverCounterSat, 655 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 345 SdHoareTripleChecker+Valid, 131 SdHoareTripleChecker+Invalid, 5025 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 655 IncrementalHoareTripleChecker+Valid, 4370 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2022-11-16 16:02:49,378 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [345 Valid, 131 Invalid, 5025 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [655 Valid, 4370 Invalid, 0 Unknown, 0 Unchecked, 2.9s Time] [2022-11-16 16:02:49,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2022-11-16 16:02:49,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 143. [2022-11-16 16:02:49,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 142 states have (on average 1.1971830985915493) internal successors, (170), 142 states have internal predecessors, (170), 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) [2022-11-16 16:02:49,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 170 transitions. [2022-11-16 16:02:49,780 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 170 transitions. Word has length 115 [2022-11-16 16:02:49,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 16:02:49,781 INFO L495 AbstractCegarLoop]: Abstraction has 143 states and 170 transitions. [2022-11-16 16:02:49,781 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 184 states, 184 states have (on average 1.8478260869565217) internal successors, (340), 184 states have internal predecessors, (340), 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) [2022-11-16 16:02:49,781 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 170 transitions. [2022-11-16 16:02:49,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2022-11-16 16:02:49,782 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 16:02:49,782 INFO L195 NwaCegarLoop]: trace histogram [29, 28, 27, 27, 1, 1, 1, 1, 1] [2022-11-16 16:02:49,786 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2022-11-16 16:02:49,982 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:02:49,982 INFO L420 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 16:02:49,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 16:02:49,983 INFO L85 PathProgramCache]: Analyzing trace with hash 768354714, now seen corresponding path program 39 times [2022-11-16 16:02:49,983 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 16:02:49,983 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1500833136] [2022-11-16 16:02:49,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:02:49,983 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 16:02:50,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 16:02:52,009 INFO L134 CoverageAnalysis]: Checked inductivity of 1542 backedges. 378 proven. 1164 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 16:02:52,009 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 16:02:52,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1500833136] [2022-11-16 16:02:52,009 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1500833136] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 16:02:52,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1843109196] [2022-11-16 16:02:52,010 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 16:02:52,010 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:02:52,010 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 16:02:52,011 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 16:02:52,013 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2022-11-16 16:02:52,121 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 16:02:52,121 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 16:02:52,124 INFO L263 TraceCheckSpWp]: Trace formula consists of 454 conjuncts, 93 conjunts are in the unsatisfiable core [2022-11-16 16:02:52,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 16:02:53,928 INFO L134 CoverageAnalysis]: Checked inductivity of 1542 backedges. 0 proven. 1542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 16:02:53,928 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 16:02:56,226 INFO L134 CoverageAnalysis]: Checked inductivity of 1542 backedges. 0 proven. 1542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 16:02:56,226 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1843109196] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 16:02:56,226 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1318952464] [2022-11-16 16:02:56,227 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 16:02:56,227 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 16:02:56,228 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 16:02:56,228 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 16:02:56,228 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 16:02:56,305 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 16:02:57,094 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '37425#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 16:02:57,094 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 16:02:57,095 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 16:02:57,095 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 119 [2022-11-16 16:02:57,095 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1747597008] [2022-11-16 16:02:57,095 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 16:02:57,096 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 119 states [2022-11-16 16:02:57,096 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 16:02:57,097 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2022-11-16 16:02:57,097 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2293, Invalid=13207, Unknown=0, NotChecked=0, Total=15500 [2022-11-16 16:02:57,098 INFO L87 Difference]: Start difference. First operand 143 states and 170 transitions. Second operand has 119 states, 119 states have (on average 1.495798319327731) internal successors, (178), 119 states have internal predecessors, (178), 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) [2022-11-16 16:03:00,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 16:03:00,971 INFO L93 Difference]: Finished difference Result 234 states and 262 transitions. [2022-11-16 16:03:00,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2022-11-16 16:03:00,971 INFO L78 Accepts]: Start accepts. Automaton has has 119 states, 119 states have (on average 1.495798319327731) internal successors, (178), 119 states have internal predecessors, (178), 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 116 [2022-11-16 16:03:00,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 16:03:00,972 INFO L225 Difference]: With dead ends: 234 [2022-11-16 16:03:00,972 INFO L226 Difference]: Without dead ends: 232 [2022-11-16 16:03:00,973 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 464 GetRequests, 255 SyntacticMatches, 28 SemanticMatches, 181 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11351 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=5479, Invalid=27827, Unknown=0, NotChecked=0, Total=33306 [2022-11-16 16:03:00,974 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 457 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 1515 mSolverCounterSat, 279 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 457 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 1794 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 279 IncrementalHoareTripleChecker+Valid, 1515 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-16 16:03:00,974 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [457 Valid, 91 Invalid, 1794 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [279 Valid, 1515 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-16 16:03:00,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2022-11-16 16:03:01,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 120. [2022-11-16 16:03:01,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 119 states have (on average 1.0168067226890756) internal successors, (121), 119 states have internal predecessors, (121), 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) [2022-11-16 16:03:01,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 121 transitions. [2022-11-16 16:03:01,241 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 121 transitions. Word has length 116 [2022-11-16 16:03:01,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 16:03:01,241 INFO L495 AbstractCegarLoop]: Abstraction has 120 states and 121 transitions. [2022-11-16 16:03:01,241 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 119 states, 119 states have (on average 1.495798319327731) internal successors, (178), 119 states have internal predecessors, (178), 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) [2022-11-16 16:03:01,241 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 121 transitions. [2022-11-16 16:03:01,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2022-11-16 16:03:01,242 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 16:03:01,242 INFO L195 NwaCegarLoop]: trace histogram [29, 29, 28, 28, 1, 1, 1, 1, 1] [2022-11-16 16:03:01,247 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2022-11-16 16:03:01,447 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2022-11-16 16:03:01,447 INFO L420 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 16:03:01,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 16:03:01,447 INFO L85 PathProgramCache]: Analyzing trace with hash -2115577660, now seen corresponding path program 40 times [2022-11-16 16:03:01,447 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 16:03:01,447 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1022972933] [2022-11-16 16:03:01,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:03:01,448 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 16:03:01,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 16:03:05,891 INFO L134 CoverageAnalysis]: Checked inductivity of 1625 backedges. 1080 proven. 545 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 16:03:05,891 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 16:03:05,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1022972933] [2022-11-16 16:03:05,891 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1022972933] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 16:03:05,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1746002999] [2022-11-16 16:03:05,891 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 16:03:05,891 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:03:05,892 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 16:03:05,892 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 16:03:05,895 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2022-11-16 16:03:05,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 16:03:06,003 INFO L263 TraceCheckSpWp]: Trace formula consists of 464 conjuncts, 124 conjunts are in the unsatisfiable core [2022-11-16 16:03:06,005 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 16:03:09,179 INFO L134 CoverageAnalysis]: Checked inductivity of 1625 backedges. 0 proven. 1625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 16:03:09,179 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 16:03:17,131 INFO L134 CoverageAnalysis]: Checked inductivity of 1625 backedges. 0 proven. 1625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 16:03:17,132 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1746002999] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 16:03:17,132 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [464010583] [2022-11-16 16:03:17,133 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 16:03:17,133 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 16:03:17,133 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 16:03:17,134 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 16:03:17,134 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 16:03:17,225 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 16:03:18,599 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '39018#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 16:03:18,599 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 16:03:18,599 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 16:03:18,600 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 62, 62] total 153 [2022-11-16 16:03:18,600 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1749929372] [2022-11-16 16:03:18,600 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 16:03:18,601 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 153 states [2022-11-16 16:03:18,601 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 16:03:18,602 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 153 interpolants. [2022-11-16 16:03:18,603 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3354, Invalid=21768, Unknown=0, NotChecked=0, Total=25122 [2022-11-16 16:03:18,603 INFO L87 Difference]: Start difference. First operand 120 states and 121 transitions. Second operand has 153 states, 153 states have (on average 2.1176470588235294) internal successors, (324), 153 states have internal predecessors, (324), 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) [2022-11-16 16:03:50,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 16:03:50,515 INFO L93 Difference]: Finished difference Result 330 states and 363 transitions. [2022-11-16 16:03:50,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 154 states. [2022-11-16 16:03:50,516 INFO L78 Accepts]: Start accepts. Automaton has has 153 states, 153 states have (on average 2.1176470588235294) internal successors, (324), 153 states have internal predecessors, (324), 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 119 [2022-11-16 16:03:50,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 16:03:50,517 INFO L225 Difference]: With dead ends: 330 [2022-11-16 16:03:50,517 INFO L226 Difference]: Without dead ends: 238 [2022-11-16 16:03:50,520 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 538 GetRequests, 261 SyntacticMatches, 0 SemanticMatches, 277 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20723 ImplicationChecksByTransitivity, 38.7s TimeCoverageRelationStatistics Valid=10001, Invalid=67561, Unknown=0, NotChecked=0, Total=77562 [2022-11-16 16:03:50,520 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 803 mSDsluCounter, 911 mSDsCounter, 0 mSdLazyCounter, 7990 mSolverCounterSat, 1057 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 803 SdHoareTripleChecker+Valid, 914 SdHoareTripleChecker+Invalid, 9047 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1057 IncrementalHoareTripleChecker+Valid, 7990 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.1s IncrementalHoareTripleChecker+Time [2022-11-16 16:03:50,521 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [803 Valid, 914 Invalid, 9047 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1057 Valid, 7990 Invalid, 0 Unknown, 0 Unchecked, 5.1s Time] [2022-11-16 16:03:50,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 238 states. [2022-11-16 16:03:50,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 238 to 153. [2022-11-16 16:03:50,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 152 states have (on average 1.2039473684210527) internal successors, (183), 152 states have internal predecessors, (183), 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) [2022-11-16 16:03:50,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 183 transitions. [2022-11-16 16:03:50,994 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 183 transitions. Word has length 119 [2022-11-16 16:03:50,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 16:03:50,994 INFO L495 AbstractCegarLoop]: Abstraction has 153 states and 183 transitions. [2022-11-16 16:03:50,994 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 153 states, 153 states have (on average 2.1176470588235294) internal successors, (324), 153 states have internal predecessors, (324), 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) [2022-11-16 16:03:50,994 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 183 transitions. [2022-11-16 16:03:50,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2022-11-16 16:03:50,995 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 16:03:50,995 INFO L195 NwaCegarLoop]: trace histogram [30, 30, 29, 29, 1, 1, 1, 1, 1] [2022-11-16 16:03:50,999 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2022-11-16 16:03:51,195 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2022-11-16 16:03:51,196 INFO L420 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 16:03:51,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 16:03:51,196 INFO L85 PathProgramCache]: Analyzing trace with hash -287448774, now seen corresponding path program 41 times [2022-11-16 16:03:51,196 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 16:03:51,196 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1386633957] [2022-11-16 16:03:51,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:03:51,197 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 16:03:51,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 16:03:55,939 INFO L134 CoverageAnalysis]: Checked inductivity of 1741 backedges. 1162 proven. 579 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 16:03:55,940 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 16:03:55,940 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1386633957] [2022-11-16 16:03:55,943 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1386633957] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 16:03:55,943 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [387663511] [2022-11-16 16:03:55,943 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 16:03:55,943 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:03:55,943 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 16:03:55,944 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 16:03:55,946 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2022-11-16 16:03:56,116 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2022-11-16 16:03:56,116 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 16:03:56,119 INFO L263 TraceCheckSpWp]: Trace formula consists of 479 conjuncts, 104 conjunts are in the unsatisfiable core [2022-11-16 16:03:56,121 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 16:04:02,509 INFO L134 CoverageAnalysis]: Checked inductivity of 1741 backedges. 0 proven. 1741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 16:04:02,510 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 16:04:12,173 INFO L134 CoverageAnalysis]: Checked inductivity of 1741 backedges. 0 proven. 1741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 16:04:12,173 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [387663511] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 16:04:12,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1520797508] [2022-11-16 16:04:12,174 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 16:04:12,175 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 16:04:12,175 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 16:04:12,175 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 16:04:12,175 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 16:04:12,247 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 16:04:13,688 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '41026#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 16:04:13,689 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 16:04:13,689 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 16:04:13,689 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 66, 66] total 192 [2022-11-16 16:04:13,689 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1549071406] [2022-11-16 16:04:13,689 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 16:04:13,690 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 192 states [2022-11-16 16:04:13,690 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 16:04:13,691 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 192 interpolants. [2022-11-16 16:04:13,692 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4245, Invalid=34761, Unknown=0, NotChecked=0, Total=39006 [2022-11-16 16:04:13,693 INFO L87 Difference]: Start difference. First operand 153 states and 183 transitions. Second operand has 192 states, 192 states have (on average 1.8958333333333333) internal successors, (364), 192 states have internal predecessors, (364), 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) [2022-11-16 16:04:40,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 16:04:40,951 INFO L93 Difference]: Finished difference Result 251 states and 282 transitions. [2022-11-16 16:04:40,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2022-11-16 16:04:40,951 INFO L78 Accepts]: Start accepts. Automaton has has 192 states, 192 states have (on average 1.8958333333333333) internal successors, (364), 192 states have internal predecessors, (364), 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 123 [2022-11-16 16:04:40,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 16:04:40,952 INFO L225 Difference]: With dead ends: 251 [2022-11-16 16:04:40,952 INFO L226 Difference]: Without dead ends: 156 [2022-11-16 16:04:40,956 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 496 GetRequests, 236 SyntacticMatches, 0 SemanticMatches, 260 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18175 ImplicationChecksByTransitivity, 41.9s TimeCoverageRelationStatistics Valid=7523, Invalid=60859, Unknown=0, NotChecked=0, Total=68382 [2022-11-16 16:04:40,957 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 279 mSDsluCounter, 127 mSDsCounter, 0 mSdLazyCounter, 4523 mSolverCounterSat, 602 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 279 SdHoareTripleChecker+Valid, 130 SdHoareTripleChecker+Invalid, 5125 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 602 IncrementalHoareTripleChecker+Valid, 4523 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2022-11-16 16:04:40,957 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [279 Valid, 130 Invalid, 5125 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [602 Valid, 4523 Invalid, 0 Unknown, 0 Unchecked, 2.9s Time] [2022-11-16 16:04:40,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2022-11-16 16:04:41,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 153. [2022-11-16 16:04:41,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 152 states have (on average 1.1973684210526316) internal successors, (182), 152 states have internal predecessors, (182), 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) [2022-11-16 16:04:41,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 182 transitions. [2022-11-16 16:04:41,478 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 182 transitions. Word has length 123 [2022-11-16 16:04:41,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 16:04:41,478 INFO L495 AbstractCegarLoop]: Abstraction has 153 states and 182 transitions. [2022-11-16 16:04:41,478 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 192 states, 192 states have (on average 1.8958333333333333) internal successors, (364), 192 states have internal predecessors, (364), 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) [2022-11-16 16:04:41,478 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 182 transitions. [2022-11-16 16:04:41,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2022-11-16 16:04:41,479 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 16:04:41,479 INFO L195 NwaCegarLoop]: trace histogram [31, 30, 29, 29, 1, 1, 1, 1, 1] [2022-11-16 16:04:41,484 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2022-11-16 16:04:41,679 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2022-11-16 16:04:41,680 INFO L420 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 16:04:41,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 16:04:41,680 INFO L85 PathProgramCache]: Analyzing trace with hash -984818342, now seen corresponding path program 42 times [2022-11-16 16:04:41,680 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 16:04:41,680 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1805778482] [2022-11-16 16:04:41,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:04:41,680 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 16:04:41,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 16:04:43,960 INFO L134 CoverageAnalysis]: Checked inductivity of 1772 backedges. 435 proven. 1337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 16:04:43,961 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 16:04:43,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1805778482] [2022-11-16 16:04:43,961 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1805778482] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 16:04:43,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [870236850] [2022-11-16 16:04:43,961 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 16:04:43,961 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:04:43,962 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 16:04:43,963 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 16:04:43,975 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2022-11-16 16:04:44,095 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 16:04:44,096 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 16:04:44,099 INFO L263 TraceCheckSpWp]: Trace formula consists of 484 conjuncts, 99 conjunts are in the unsatisfiable core [2022-11-16 16:04:44,102 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 16:04:46,108 INFO L134 CoverageAnalysis]: Checked inductivity of 1772 backedges. 0 proven. 1772 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 16:04:46,108 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 16:04:48,727 INFO L134 CoverageAnalysis]: Checked inductivity of 1772 backedges. 0 proven. 1772 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 16:04:48,728 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [870236850] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 16:04:48,728 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2009730430] [2022-11-16 16:04:48,729 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 16:04:48,729 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 16:04:48,729 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 16:04:48,729 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 16:04:48,730 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 16:04:48,803 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 16:04:49,632 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '42731#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 16:04:49,632 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 16:04:49,632 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 16:04:49,632 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64] total 127 [2022-11-16 16:04:49,633 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1089399162] [2022-11-16 16:04:49,633 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 16:04:49,633 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 127 states [2022-11-16 16:04:49,633 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 16:04:49,633 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 127 interpolants. [2022-11-16 16:04:49,634 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2604, Invalid=14952, Unknown=0, NotChecked=0, Total=17556 [2022-11-16 16:04:49,634 INFO L87 Difference]: Start difference. First operand 153 states and 182 transitions. Second operand has 127 states, 127 states have (on average 1.4960629921259843) internal successors, (190), 127 states have internal predecessors, (190), 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) [2022-11-16 16:04:54,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 16:04:54,001 INFO L93 Difference]: Finished difference Result 250 states and 280 transitions. [2022-11-16 16:04:54,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2022-11-16 16:04:54,002 INFO L78 Accepts]: Start accepts. Automaton has has 127 states, 127 states have (on average 1.4960629921259843) internal successors, (190), 127 states have internal predecessors, (190), 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 124 [2022-11-16 16:04:54,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 16:04:54,003 INFO L225 Difference]: With dead ends: 250 [2022-11-16 16:04:54,003 INFO L226 Difference]: Without dead ends: 248 [2022-11-16 16:04:54,004 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 496 GetRequests, 273 SyntacticMatches, 30 SemanticMatches, 193 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12941 ImplicationChecksByTransitivity, 8.7s TimeCoverageRelationStatistics Valid=6227, Invalid=31603, Unknown=0, NotChecked=0, Total=37830 [2022-11-16 16:04:54,005 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 635 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 1629 mSolverCounterSat, 358 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 635 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 1987 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 358 IncrementalHoareTripleChecker+Valid, 1629 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-16 16:04:54,005 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [635 Valid, 81 Invalid, 1987 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [358 Valid, 1629 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-16 16:04:54,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2022-11-16 16:04:54,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 128. [2022-11-16 16:04:54,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 127 states have (on average 1.015748031496063) internal successors, (129), 127 states have internal predecessors, (129), 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) [2022-11-16 16:04:54,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 129 transitions. [2022-11-16 16:04:54,357 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 129 transitions. Word has length 124 [2022-11-16 16:04:54,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 16:04:54,357 INFO L495 AbstractCegarLoop]: Abstraction has 128 states and 129 transitions. [2022-11-16 16:04:54,357 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 127 states, 127 states have (on average 1.4960629921259843) internal successors, (190), 127 states have internal predecessors, (190), 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) [2022-11-16 16:04:54,357 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 129 transitions. [2022-11-16 16:04:54,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2022-11-16 16:04:54,358 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 16:04:54,358 INFO L195 NwaCegarLoop]: trace histogram [31, 31, 30, 30, 1, 1, 1, 1, 1] [2022-11-16 16:04:54,365 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2022-11-16 16:04:54,558 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2022-11-16 16:04:54,559 INFO L420 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 16:04:54,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 16:04:54,559 INFO L85 PathProgramCache]: Analyzing trace with hash 203197700, now seen corresponding path program 43 times [2022-11-16 16:04:54,559 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 16:04:54,559 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1935947852] [2022-11-16 16:04:54,559 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:04:54,559 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 16:04:54,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 16:04:59,690 INFO L134 CoverageAnalysis]: Checked inductivity of 1861 backedges. 1247 proven. 614 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 16:04:59,691 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 16:04:59,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1935947852] [2022-11-16 16:04:59,691 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1935947852] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 16:04:59,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1909003122] [2022-11-16 16:04:59,691 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 16:04:59,691 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:04:59,692 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 16:04:59,693 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 16:04:59,695 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2022-11-16 16:04:59,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 16:04:59,819 INFO L263 TraceCheckSpWp]: Trace formula consists of 494 conjuncts, 132 conjunts are in the unsatisfiable core [2022-11-16 16:04:59,822 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 16:05:03,414 INFO L134 CoverageAnalysis]: Checked inductivity of 1861 backedges. 0 proven. 1861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 16:05:03,414 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 16:05:12,355 INFO L134 CoverageAnalysis]: Checked inductivity of 1861 backedges. 0 proven. 1861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 16:05:12,356 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1909003122] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 16:05:12,356 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [266977480] [2022-11-16 16:05:12,357 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 16:05:12,357 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 16:05:12,357 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 16:05:12,357 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 16:05:12,358 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 16:05:12,422 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 16:05:13,700 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '44432#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 16:05:13,700 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 16:05:13,700 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 16:05:13,701 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 66, 66] total 163 [2022-11-16 16:05:13,701 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [665653665] [2022-11-16 16:05:13,701 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 16:05:13,701 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 163 states [2022-11-16 16:05:13,702 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 16:05:13,703 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 163 interpolants. [2022-11-16 16:05:13,704 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3799, Invalid=24593, Unknown=0, NotChecked=0, Total=28392 [2022-11-16 16:05:13,704 INFO L87 Difference]: Start difference. First operand 128 states and 129 transitions. Second operand has 163 states, 163 states have (on average 2.1226993865030677) internal successors, (346), 163 states have internal predecessors, (346), 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) [2022-11-16 16:05:51,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 16:05:51,131 INFO L93 Difference]: Finished difference Result 352 states and 387 transitions. [2022-11-16 16:05:51,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 164 states. [2022-11-16 16:05:51,132 INFO L78 Accepts]: Start accepts. Automaton has has 163 states, 163 states have (on average 2.1226993865030677) internal successors, (346), 163 states have internal predecessors, (346), 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 127 [2022-11-16 16:05:51,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 16:05:51,133 INFO L225 Difference]: With dead ends: 352 [2022-11-16 16:05:51,133 INFO L226 Difference]: Without dead ends: 254 [2022-11-16 16:05:51,137 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 574 GetRequests, 279 SyntacticMatches, 0 SemanticMatches, 295 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23515 ImplicationChecksByTransitivity, 44.6s TimeCoverageRelationStatistics Valid=11336, Invalid=76576, Unknown=0, NotChecked=0, Total=87912 [2022-11-16 16:05:51,137 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 894 mSDsluCounter, 1045 mSDsCounter, 0 mSdLazyCounter, 9315 mSolverCounterSat, 1161 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 894 SdHoareTripleChecker+Valid, 1048 SdHoareTripleChecker+Invalid, 10476 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1161 IncrementalHoareTripleChecker+Valid, 9315 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.0s IncrementalHoareTripleChecker+Time [2022-11-16 16:05:51,137 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [894 Valid, 1048 Invalid, 10476 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1161 Valid, 9315 Invalid, 0 Unknown, 0 Unchecked, 6.0s Time] [2022-11-16 16:05:51,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2022-11-16 16:05:52,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 163. [2022-11-16 16:05:52,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 163 states, 162 states have (on average 1.2037037037037037) internal successors, (195), 162 states have internal predecessors, (195), 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) [2022-11-16 16:05:52,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 195 transitions. [2022-11-16 16:05:52,046 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 195 transitions. Word has length 127 [2022-11-16 16:05:52,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 16:05:52,046 INFO L495 AbstractCegarLoop]: Abstraction has 163 states and 195 transitions. [2022-11-16 16:05:52,046 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 163 states, 163 states have (on average 2.1226993865030677) internal successors, (346), 163 states have internal predecessors, (346), 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) [2022-11-16 16:05:52,046 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 195 transitions. [2022-11-16 16:05:52,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2022-11-16 16:05:52,047 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 16:05:52,047 INFO L195 NwaCegarLoop]: trace histogram [32, 32, 31, 31, 1, 1, 1, 1, 1] [2022-11-16 16:05:52,052 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2022-11-16 16:05:52,247 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2022-11-16 16:05:52,248 INFO L420 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 16:05:52,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 16:05:52,248 INFO L85 PathProgramCache]: Analyzing trace with hash -991238918, now seen corresponding path program 44 times [2022-11-16 16:05:52,248 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 16:05:52,248 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [582742037] [2022-11-16 16:05:52,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:05:52,248 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 16:05:52,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 16:05:57,931 INFO L134 CoverageAnalysis]: Checked inductivity of 1985 backedges. 1335 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 16:05:57,931 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 16:05:57,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [582742037] [2022-11-16 16:05:57,931 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [582742037] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 16:05:57,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1597838239] [2022-11-16 16:05:57,931 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 16:05:57,931 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:05:57,932 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 16:05:57,932 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 16:05:57,952 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2022-11-16 16:05:58,137 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2022-11-16 16:05:58,137 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 16:05:58,141 INFO L263 TraceCheckSpWp]: Trace formula consists of 509 conjuncts, 119 conjunts are in the unsatisfiable core [2022-11-16 16:05:58,143 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 16:06:06,081 INFO L134 CoverageAnalysis]: Checked inductivity of 1985 backedges. 0 proven. 1985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 16:06:06,081 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 16:06:17,699 INFO L134 CoverageAnalysis]: Checked inductivity of 1985 backedges. 0 proven. 1985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 16:06:17,699 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1597838239] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 16:06:17,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1606695990] [2022-11-16 16:06:17,700 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 16:06:17,700 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 16:06:17,701 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 16:06:17,701 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 16:06:17,701 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 16:06:17,784 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 16:06:19,223 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '46576#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 16:06:19,223 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 16:06:19,223 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 16:06:19,223 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 72, 72] total 208 [2022-11-16 16:06:19,223 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [480668591] [2022-11-16 16:06:19,224 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 16:06:19,224 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 208 states [2022-11-16 16:06:19,224 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 16:06:19,225 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 208 interpolants. [2022-11-16 16:06:19,227 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4941, Invalid=40641, Unknown=0, NotChecked=0, Total=45582 [2022-11-16 16:06:19,227 INFO L87 Difference]: Start difference. First operand 163 states and 195 transitions. Second operand has 208 states, 208 states have (on average 1.8653846153846154) internal successors, (388), 208 states have internal predecessors, (388), 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) [2022-11-16 16:06:54,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 16:06:54,497 INFO L93 Difference]: Finished difference Result 267 states and 300 transitions. [2022-11-16 16:06:54,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2022-11-16 16:06:54,497 INFO L78 Accepts]: Start accepts. Automaton has has 208 states, 208 states have (on average 1.8653846153846154) internal successors, (388), 208 states have internal predecessors, (388), 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 131 [2022-11-16 16:06:54,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 16:06:54,498 INFO L225 Difference]: With dead ends: 267 [2022-11-16 16:06:54,498 INFO L226 Difference]: Without dead ends: 166 [2022-11-16 16:06:54,503 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 530 GetRequests, 248 SyntacticMatches, 0 SemanticMatches, 282 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21813 ImplicationChecksByTransitivity, 51.8s TimeCoverageRelationStatistics Valid=8807, Invalid=71565, Unknown=0, NotChecked=0, Total=80372 [2022-11-16 16:06:54,504 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 385 mSDsluCounter, 161 mSDsCounter, 0 mSdLazyCounter, 6692 mSolverCounterSat, 774 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 385 SdHoareTripleChecker+Valid, 164 SdHoareTripleChecker+Invalid, 7466 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 774 IncrementalHoareTripleChecker+Valid, 6692 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.3s IncrementalHoareTripleChecker+Time [2022-11-16 16:06:54,504 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [385 Valid, 164 Invalid, 7466 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [774 Valid, 6692 Invalid, 0 Unknown, 0 Unchecked, 4.3s Time] [2022-11-16 16:06:54,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2022-11-16 16:06:55,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 163. [2022-11-16 16:06:55,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 163 states, 162 states have (on average 1.1975308641975309) internal successors, (194), 162 states have internal predecessors, (194), 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) [2022-11-16 16:06:55,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 194 transitions. [2022-11-16 16:06:55,209 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 194 transitions. Word has length 131 [2022-11-16 16:06:55,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 16:06:55,209 INFO L495 AbstractCegarLoop]: Abstraction has 163 states and 194 transitions. [2022-11-16 16:06:55,209 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 208 states, 208 states have (on average 1.8653846153846154) internal successors, (388), 208 states have internal predecessors, (388), 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) [2022-11-16 16:06:55,210 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 194 transitions. [2022-11-16 16:06:55,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2022-11-16 16:06:55,210 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 16:06:55,210 INFO L195 NwaCegarLoop]: trace histogram [33, 32, 31, 31, 1, 1, 1, 1, 1] [2022-11-16 16:06:55,215 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2022-11-16 16:06:55,410 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47,48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:06:55,411 INFO L420 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 16:06:55,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 16:06:55,411 INFO L85 PathProgramCache]: Analyzing trace with hash 858505498, now seen corresponding path program 45 times [2022-11-16 16:06:55,411 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 16:06:55,411 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1544015908] [2022-11-16 16:06:55,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:06:55,411 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 16:06:55,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 16:06:58,018 INFO L134 CoverageAnalysis]: Checked inductivity of 2018 backedges. 496 proven. 1522 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 16:06:58,018 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 16:06:58,018 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1544015908] [2022-11-16 16:06:58,018 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1544015908] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 16:06:58,018 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [669515233] [2022-11-16 16:06:58,018 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 16:06:58,018 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:06:58,019 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 16:06:58,019 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 16:06:58,021 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2022-11-16 16:06:58,143 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 16:06:58,143 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 16:06:58,148 INFO L263 TraceCheckSpWp]: Trace formula consists of 514 conjuncts, 105 conjunts are in the unsatisfiable core [2022-11-16 16:06:58,150 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 16:07:00,440 INFO L134 CoverageAnalysis]: Checked inductivity of 2018 backedges. 0 proven. 2018 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 16:07:00,440 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 16:07:03,373 INFO L134 CoverageAnalysis]: Checked inductivity of 2018 backedges. 0 proven. 2018 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 16:07:03,373 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [669515233] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 16:07:03,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1274367895] [2022-11-16 16:07:03,374 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-16 16:07:03,375 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 16:07:03,375 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 16:07:03,375 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 16:07:03,375 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 16:07:03,438 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 16:07:04,344 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '48395#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 16:07:04,344 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 16:07:04,345 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 16:07:04,345 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 135 [2022-11-16 16:07:04,345 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1658373125] [2022-11-16 16:07:04,345 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 16:07:04,346 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 135 states [2022-11-16 16:07:04,346 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 16:07:04,347 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 135 interpolants. [2022-11-16 16:07:04,347 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2935, Invalid=16805, Unknown=0, NotChecked=0, Total=19740 [2022-11-16 16:07:04,347 INFO L87 Difference]: Start difference. First operand 163 states and 194 transitions. Second operand has 135 states, 135 states have (on average 1.4962962962962962) internal successors, (202), 135 states have internal predecessors, (202), 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) [2022-11-16 16:07:09,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 16:07:09,315 INFO L93 Difference]: Finished difference Result 266 states and 298 transitions. [2022-11-16 16:07:09,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2022-11-16 16:07:09,316 INFO L78 Accepts]: Start accepts. Automaton has has 135 states, 135 states have (on average 1.4962962962962962) internal successors, (202), 135 states have internal predecessors, (202), 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 132 [2022-11-16 16:07:09,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 16:07:09,317 INFO L225 Difference]: With dead ends: 266 [2022-11-16 16:07:09,317 INFO L226 Difference]: Without dead ends: 264 [2022-11-16 16:07:09,319 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 528 GetRequests, 291 SyntacticMatches, 32 SemanticMatches, 205 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14635 ImplicationChecksByTransitivity, 9.8s TimeCoverageRelationStatistics Valid=7023, Invalid=35619, Unknown=0, NotChecked=0, Total=42642 [2022-11-16 16:07:09,320 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 585 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 1912 mSolverCounterSat, 324 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 585 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 2236 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 324 IncrementalHoareTripleChecker+Valid, 1912 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-16 16:07:09,320 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [585 Valid, 87 Invalid, 2236 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [324 Valid, 1912 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-16 16:07:09,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 264 states. [2022-11-16 16:07:09,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 264 to 136. [2022-11-16 16:07:09,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 135 states have (on average 1.0148148148148148) internal successors, (137), 135 states have internal predecessors, (137), 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) [2022-11-16 16:07:09,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 137 transitions. [2022-11-16 16:07:09,840 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 137 transitions. Word has length 132 [2022-11-16 16:07:09,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 16:07:09,840 INFO L495 AbstractCegarLoop]: Abstraction has 136 states and 137 transitions. [2022-11-16 16:07:09,840 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 135 states, 135 states have (on average 1.4962962962962962) internal successors, (202), 135 states have internal predecessors, (202), 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) [2022-11-16 16:07:09,841 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 137 transitions. [2022-11-16 16:07:09,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2022-11-16 16:07:09,841 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 16:07:09,841 INFO L195 NwaCegarLoop]: trace histogram [33, 33, 32, 32, 1, 1, 1, 1, 1] [2022-11-16 16:07:09,847 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2022-11-16 16:07:10,042 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dca10a3e-8810-4beb-8199-e7cbbdb7c0de/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2022-11-16 16:07:10,042 INFO L420 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 16:07:10,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 16:07:10,042 INFO L85 PathProgramCache]: Analyzing trace with hash -788131516, now seen corresponding path program 46 times [2022-11-16 16:07:10,042 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 16:07:10,042 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2024809856] [2022-11-16 16:07:10,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:07:10,042 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 16:07:10,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat