./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-invgen/up.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 2329fc70 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-invgen/up.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash ff5c10c83c8d29dcc2c2798035fa2754df224d2313ad9c91b6ee5bb6ca3d9a9f --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-2329fc7 [2022-12-14 08:54:02,942 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 08:54:02,944 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 08:54:02,958 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 08:54:02,958 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 08:54:02,959 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 08:54:02,960 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 08:54:02,961 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 08:54:02,962 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 08:54:02,962 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 08:54:02,963 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 08:54:02,964 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 08:54:02,964 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 08:54:02,965 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 08:54:02,965 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 08:54:02,966 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 08:54:02,967 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 08:54:02,967 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 08:54:02,969 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 08:54:02,970 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 08:54:02,971 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 08:54:02,972 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 08:54:02,972 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 08:54:02,973 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 08:54:02,975 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 08:54:02,976 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 08:54:02,976 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 08:54:02,976 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 08:54:02,977 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 08:54:02,977 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 08:54:02,978 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 08:54:02,978 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 08:54:02,979 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 08:54:02,979 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 08:54:02,980 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 08:54:02,980 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 08:54:02,981 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 08:54:02,981 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 08:54:02,981 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 08:54:02,982 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 08:54:02,982 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 08:54:02,983 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-12-14 08:54:02,998 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 08:54:02,998 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 08:54:02,999 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 08:54:02,999 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 08:54:02,999 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 08:54:02,999 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 08:54:02,999 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 08:54:03,000 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 08:54:03,000 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 08:54:03,000 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 08:54:03,000 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 08:54:03,000 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 08:54:03,000 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 08:54:03,001 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 08:54:03,001 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 08:54:03,001 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 08:54:03,001 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 08:54:03,001 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 08:54:03,002 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 08:54:03,002 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-14 08:54:03,002 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 08:54:03,002 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-14 08:54:03,002 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 08:54:03,003 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-12-14 08:54:03,003 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 08:54:03,003 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-12-14 08:54:03,003 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-14 08:54:03,003 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-12-14 08:54:03,003 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 08:54:03,004 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-12-14 08:54:03,004 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 08:54:03,004 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 08:54:03,004 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 08:54:03,004 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 08:54:03,004 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 08:54:03,005 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 08:54:03,005 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-12-14 08:54:03,005 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 08:54:03,005 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 08:54:03,005 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-12-14 08:54:03,005 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 08:54:03,005 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_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ff5c10c83c8d29dcc2c2798035fa2754df224d2313ad9c91b6ee5bb6ca3d9a9f [2022-12-14 08:54:03,174 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 08:54:03,189 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 08:54:03,191 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 08:54:03,192 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 08:54:03,192 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 08:54:03,193 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/loop-invgen/up.i [2022-12-14 08:54:05,719 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 08:54:05,861 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 08:54:05,861 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/sv-benchmarks/c/loop-invgen/up.i [2022-12-14 08:54:05,865 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/data/546f9e928/44755694cf074dcf9ad76938d40cf819/FLAG9aec52a94 [2022-12-14 08:54:06,271 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/data/546f9e928/44755694cf074dcf9ad76938d40cf819 [2022-12-14 08:54:06,273 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 08:54:06,274 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 08:54:06,275 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 08:54:06,275 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 08:54:06,277 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 08:54:06,278 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 08:54:06" (1/1) ... [2022-12-14 08:54:06,278 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4b8cb299 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:54:06, skipping insertion in model container [2022-12-14 08:54:06,279 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 08:54:06" (1/1) ... [2022-12-14 08:54:06,284 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 08:54:06,294 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 08:54:06,392 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/sv-benchmarks/c/loop-invgen/up.i[893,906] [2022-12-14 08:54:06,399 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 08:54:06,406 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 08:54:06,414 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/sv-benchmarks/c/loop-invgen/up.i[893,906] [2022-12-14 08:54:06,416 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 08:54:06,426 INFO L208 MainTranslator]: Completed translation [2022-12-14 08:54:06,426 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:54:06 WrapperNode [2022-12-14 08:54:06,426 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 08:54:06,427 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 08:54:06,427 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 08:54:06,427 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 08:54:06,432 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:54:06" (1/1) ... [2022-12-14 08:54:06,437 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:54:06" (1/1) ... [2022-12-14 08:54:06,447 INFO L138 Inliner]: procedures = 16, calls = 7, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 43 [2022-12-14 08:54:06,448 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 08:54:06,448 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 08:54:06,448 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 08:54:06,448 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 08:54:06,454 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:54:06" (1/1) ... [2022-12-14 08:54:06,454 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:54:06" (1/1) ... [2022-12-14 08:54:06,455 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:54:06" (1/1) ... [2022-12-14 08:54:06,455 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:54:06" (1/1) ... [2022-12-14 08:54:06,457 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:54:06" (1/1) ... [2022-12-14 08:54:06,459 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:54:06" (1/1) ... [2022-12-14 08:54:06,460 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:54:06" (1/1) ... [2022-12-14 08:54:06,460 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:54:06" (1/1) ... [2022-12-14 08:54:06,461 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 08:54:06,461 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 08:54:06,462 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 08:54:06,462 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 08:54:06,462 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:54:06" (1/1) ... [2022-12-14 08:54:06,467 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 08:54:06,474 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:06,483 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 08:54:06,485 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 08:54:06,519 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-14 08:54:06,519 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-12-14 08:54:06,519 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 08:54:06,519 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 08:54:06,571 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 08:54:06,573 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 08:54:06,644 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 08:54:06,663 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 08:54:06,663 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-12-14 08:54:06,666 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 08:54:06 BoogieIcfgContainer [2022-12-14 08:54:06,666 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 08:54:06,668 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 08:54:06,668 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 08:54:06,670 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 08:54:06,671 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 08:54:06" (1/3) ... [2022-12-14 08:54:06,671 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2d1d0ad8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 08:54:06, skipping insertion in model container [2022-12-14 08:54:06,671 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:54:06" (2/3) ... [2022-12-14 08:54:06,671 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2d1d0ad8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 08:54:06, skipping insertion in model container [2022-12-14 08:54:06,672 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 08:54:06" (3/3) ... [2022-12-14 08:54:06,673 INFO L112 eAbstractionObserver]: Analyzing ICFG up.i [2022-12-14 08:54:06,689 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 08:54:06,689 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-12-14 08:54:06,729 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 08:54:06,735 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;@14b50342, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 08:54:06,736 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-12-14 08:54:06,739 INFO L276 IsEmpty]: Start isEmpty. Operand has 8 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:06,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-12-14 08:54:06,744 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:06,745 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2022-12-14 08:54:06,746 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:06,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:06,751 INFO L85 PathProgramCache]: Analyzing trace with hash 67887828, now seen corresponding path program 1 times [2022-12-14 08:54:06,760 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:06,761 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1295883157] [2022-12-14 08:54:06,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:06,761 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:06,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:06,936 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:06,937 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:06,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1295883157] [2022-12-14 08:54:06,937 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1295883157] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 08:54:06,938 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 08:54:06,938 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 08:54:06,939 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [89936627] [2022-12-14 08:54:06,939 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 08:54:06,942 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 08:54:06,943 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:06,963 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 08:54:06,964 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-12-14 08:54:06,966 INFO L87 Difference]: Start difference. First operand has 8 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:07,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:07,008 INFO L93 Difference]: Finished difference Result 17 states and 21 transitions. [2022-12-14 08:54:07,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 08:54:07,010 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 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 5 [2022-12-14 08:54:07,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:07,015 INFO L225 Difference]: With dead ends: 17 [2022-12-14 08:54:07,016 INFO L226 Difference]: Without dead ends: 8 [2022-12-14 08:54:07,018 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-12-14 08:54:07,020 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 3 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:07,021 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 13 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:54:07,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2022-12-14 08:54:07,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2022-12-14 08:54:07,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:07,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 9 transitions. [2022-12-14 08:54:07,043 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 9 transitions. Word has length 5 [2022-12-14 08:54:07,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:07,044 INFO L495 AbstractCegarLoop]: Abstraction has 8 states and 9 transitions. [2022-12-14 08:54:07,044 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:07,044 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 9 transitions. [2022-12-14 08:54:07,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-12-14 08:54:07,044 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:07,044 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-12-14 08:54:07,044 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-12-14 08:54:07,045 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:07,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:07,045 INFO L85 PathProgramCache]: Analyzing trace with hash 2072851919, now seen corresponding path program 1 times [2022-12-14 08:54:07,045 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:07,045 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1772416803] [2022-12-14 08:54:07,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:07,046 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:07,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:07,130 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:07,130 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:07,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1772416803] [2022-12-14 08:54:07,131 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1772416803] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:07,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1289652598] [2022-12-14 08:54:07,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:07,131 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:07,132 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:07,133 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:07,134 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-12-14 08:54:07,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:07,175 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 8 conjunts are in the unsatisfiable core [2022-12-14 08:54:07,179 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:54:07,227 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:07,227 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 08:54:07,227 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1289652598] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 08:54:07,227 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-12-14 08:54:07,228 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2022-12-14 08:54:07,228 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [918661575] [2022-12-14 08:54:07,229 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 08:54:07,229 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 08:54:07,230 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:07,230 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 08:54:07,231 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2022-12-14 08:54:07,231 INFO L87 Difference]: Start difference. First operand 8 states and 9 transitions. Second operand has 5 states, 5 states have (on average 1.2) internal successors, (6), 4 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) [2022-12-14 08:54:07,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:07,268 INFO L93 Difference]: Finished difference Result 18 states and 19 transitions. [2022-12-14 08:54:07,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 08:54:07,269 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 4 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 [2022-12-14 08:54:07,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:07,270 INFO L225 Difference]: With dead ends: 18 [2022-12-14 08:54:07,270 INFO L226 Difference]: Without dead ends: 16 [2022-12-14 08:54:07,270 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2022-12-14 08:54:07,272 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 10 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:07,272 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 9 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:54:07,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-12-14 08:54:07,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 10. [2022-12-14 08:54:07,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:07,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 11 transitions. [2022-12-14 08:54:07,276 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 11 transitions. Word has length 6 [2022-12-14 08:54:07,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:07,276 INFO L495 AbstractCegarLoop]: Abstraction has 10 states and 11 transitions. [2022-12-14 08:54:07,276 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 4 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) [2022-12-14 08:54:07,277 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 11 transitions. [2022-12-14 08:54:07,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-12-14 08:54:07,277 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:07,277 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:54:07,282 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-12-14 08:54:07,478 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:07,479 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:07,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:07,480 INFO L85 PathProgramCache]: Analyzing trace with hash -703442678, now seen corresponding path program 1 times [2022-12-14 08:54:07,480 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:07,481 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1719128832] [2022-12-14 08:54:07,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:07,481 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:07,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:07,687 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:07,687 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:07,687 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1719128832] [2022-12-14 08:54:07,688 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1719128832] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:07,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1672709955] [2022-12-14 08:54:07,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:07,688 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:07,688 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:07,689 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:07,690 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-12-14 08:54:07,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:07,722 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 6 conjunts are in the unsatisfiable core [2022-12-14 08:54:07,724 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:54:07,776 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:07,776 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:54:07,807 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:07,807 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1672709955] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:54:07,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [725414111] [2022-12-14 08:54:07,822 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:54:07,822 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:54:07,831 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:54:07,835 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:54:07,836 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:54:07,987 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:54:08,200 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '178#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:54:08,200 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:54:08,200 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:54:08,201 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2022-12-14 08:54:08,201 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2016992114] [2022-12-14 08:54:08,201 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:54:08,201 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-12-14 08:54:08,201 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:08,202 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-12-14 08:54:08,203 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2022-12-14 08:54:08,203 INFO L87 Difference]: Start difference. First operand 10 states and 11 transitions. Second operand has 10 states, 10 states have (on average 2.0) internal successors, (20), 9 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:08,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:08,243 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2022-12-14 08:54:08,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 08:54:08,243 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.0) internal successors, (20), 9 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) Word has length 9 [2022-12-14 08:54:08,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:08,243 INFO L225 Difference]: With dead ends: 20 [2022-12-14 08:54:08,243 INFO L226 Difference]: Without dead ends: 11 [2022-12-14 08:54:08,244 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 14 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=56, Invalid=216, Unknown=0, NotChecked=0, Total=272 [2022-12-14 08:54:08,244 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 4 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:08,245 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 20 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:54:08,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2022-12-14 08:54:08,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2022-12-14 08:54:08,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:08,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2022-12-14 08:54:08,247 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 9 [2022-12-14 08:54:08,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:08,247 INFO L495 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2022-12-14 08:54:08,247 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.0) internal successors, (20), 9 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:08,247 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2022-12-14 08:54:08,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-12-14 08:54:08,247 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:08,247 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1] [2022-12-14 08:54:08,253 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-12-14 08:54:08,448 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:08,449 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:08,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:08,450 INFO L85 PathProgramCache]: Analyzing trace with hash 913026693, now seen corresponding path program 2 times [2022-12-14 08:54:08,450 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:08,450 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [446267564] [2022-12-14 08:54:08,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:08,451 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:08,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:08,630 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:08,634 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:08,634 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [446267564] [2022-12-14 08:54:08,635 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [446267564] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:08,635 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1533134911] [2022-12-14 08:54:08,635 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:54:08,635 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:08,635 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:08,636 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:08,637 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-12-14 08:54:08,671 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-12-14 08:54:08,671 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:54:08,672 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 10 conjunts are in the unsatisfiable core [2022-12-14 08:54:08,672 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:54:08,698 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:08,698 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:54:08,725 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:08,725 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1533134911] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:54:08,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [768429859] [2022-12-14 08:54:08,728 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:54:08,728 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:54:08,728 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:54:08,728 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:54:08,728 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:54:08,810 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:54:08,945 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '297#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:54:08,945 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:54:08,945 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:54:08,945 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 7 [2022-12-14 08:54:08,945 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1788324447] [2022-12-14 08:54:08,945 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:54:08,946 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-12-14 08:54:08,946 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:08,946 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-12-14 08:54:08,947 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2022-12-14 08:54:08,947 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand has 8 states, 8 states have (on average 1.75) internal successors, (14), 7 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:09,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:09,000 INFO L93 Difference]: Finished difference Result 22 states and 23 transitions. [2022-12-14 08:54:09,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-12-14 08:54:09,001 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 7 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-12-14 08:54:09,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:09,001 INFO L225 Difference]: With dead ends: 22 [2022-12-14 08:54:09,002 INFO L226 Difference]: Without dead ends: 20 [2022-12-14 08:54:09,002 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 19 SyntacticMatches, 4 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=70, Invalid=202, Unknown=0, NotChecked=0, Total=272 [2022-12-14 08:54:09,003 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 18 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:09,003 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 11 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:54:09,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-12-14 08:54:09,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 14. [2022-12-14 08:54:09,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:09,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2022-12-14 08:54:09,006 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 10 [2022-12-14 08:54:09,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:09,006 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2022-12-14 08:54:09,006 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 7 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:09,006 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2022-12-14 08:54:09,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-12-14 08:54:09,007 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:09,007 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1] [2022-12-14 08:54:09,011 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-12-14 08:54:09,207 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:09,208 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:09,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:09,208 INFO L85 PathProgramCache]: Analyzing trace with hash -44854124, now seen corresponding path program 3 times [2022-12-14 08:54:09,208 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:09,208 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [797980389] [2022-12-14 08:54:09,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:09,208 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:09,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:09,274 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:09,274 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:09,275 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [797980389] [2022-12-14 08:54:09,275 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [797980389] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:09,275 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1356898050] [2022-12-14 08:54:09,275 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:54:09,275 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:09,275 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:09,276 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:09,277 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-12-14 08:54:09,309 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:54:09,309 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:54:09,310 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 8 conjunts are in the unsatisfiable core [2022-12-14 08:54:09,311 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:54:09,368 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:09,368 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:54:09,409 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:09,409 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1356898050] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:54:09,409 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [263751140] [2022-12-14 08:54:09,411 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:54:09,411 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:54:09,412 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:54:09,412 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:54:09,412 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:54:09,500 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:54:09,663 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '450#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:54:09,664 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:54:09,664 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:54:09,664 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2022-12-14 08:54:09,664 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [735749848] [2022-12-14 08:54:09,664 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:54:09,664 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-12-14 08:54:09,664 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:09,665 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-12-14 08:54:09,665 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2022-12-14 08:54:09,665 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 12 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) [2022-12-14 08:54:09,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:09,716 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2022-12-14 08:54:09,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-12-14 08:54:09,716 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 12 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 13 [2022-12-14 08:54:09,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:09,716 INFO L225 Difference]: With dead ends: 27 [2022-12-14 08:54:09,716 INFO L226 Difference]: Without dead ends: 15 [2022-12-14 08:54:09,716 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 23 SyntacticMatches, 5 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=82, Invalid=338, Unknown=0, NotChecked=0, Total=420 [2022-12-14 08:54:09,717 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 7 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:09,717 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 35 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:54:09,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-12-14 08:54:09,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2022-12-14 08:54:09,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 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) [2022-12-14 08:54:09,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2022-12-14 08:54:09,720 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2022-12-14 08:54:09,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:09,720 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2022-12-14 08:54:09,720 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 12 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) [2022-12-14 08:54:09,720 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2022-12-14 08:54:09,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-12-14 08:54:09,720 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:09,720 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1] [2022-12-14 08:54:09,725 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-12-14 08:54:09,921 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:09,921 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:09,922 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:09,922 INFO L85 PathProgramCache]: Analyzing trace with hash -1367622513, now seen corresponding path program 4 times [2022-12-14 08:54:09,922 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:09,923 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [730812818] [2022-12-14 08:54:09,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:09,923 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:09,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:10,126 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:10,126 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:10,126 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [730812818] [2022-12-14 08:54:10,126 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [730812818] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:10,127 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [302866152] [2022-12-14 08:54:10,127 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:54:10,127 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:10,127 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:10,128 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:10,129 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-12-14 08:54:10,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:10,158 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 12 conjunts are in the unsatisfiable core [2022-12-14 08:54:10,159 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:54:10,186 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:10,186 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:54:10,218 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:10,218 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [302866152] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:54:10,218 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1260822376] [2022-12-14 08:54:10,220 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:54:10,220 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:54:10,221 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:54:10,221 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:54:10,221 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:54:10,289 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:54:10,413 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '615#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:54:10,413 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:54:10,413 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:54:10,413 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 8 [2022-12-14 08:54:10,414 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2062506052] [2022-12-14 08:54:10,414 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:54:10,414 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-12-14 08:54:10,414 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:10,415 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-12-14 08:54:10,415 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2022-12-14 08:54:10,415 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 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) [2022-12-14 08:54:10,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:10,479 INFO L93 Difference]: Finished difference Result 26 states and 27 transitions. [2022-12-14 08:54:10,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-12-14 08:54:10,479 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 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) Word has length 14 [2022-12-14 08:54:10,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:10,480 INFO L225 Difference]: With dead ends: 26 [2022-12-14 08:54:10,480 INFO L226 Difference]: Without dead ends: 24 [2022-12-14 08:54:10,480 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 30 SyntacticMatches, 6 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=87, Invalid=255, Unknown=0, NotChecked=0, Total=342 [2022-12-14 08:54:10,481 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 16 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:10,481 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 16 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:54:10,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-12-14 08:54:10,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 18. [2022-12-14 08:54:10,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 17 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:10,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2022-12-14 08:54:10,485 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 14 [2022-12-14 08:54:10,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:10,485 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2022-12-14 08:54:10,485 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 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) [2022-12-14 08:54:10,485 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2022-12-14 08:54:10,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-12-14 08:54:10,485 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:10,485 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1] [2022-12-14 08:54:10,492 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-12-14 08:54:10,686 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-12-14 08:54:10,686 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:10,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:10,687 INFO L85 PathProgramCache]: Analyzing trace with hash -777694646, now seen corresponding path program 5 times [2022-12-14 08:54:10,687 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:10,687 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1652150438] [2022-12-14 08:54:10,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:10,688 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:10,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:10,884 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:10,884 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:10,885 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1652150438] [2022-12-14 08:54:10,885 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1652150438] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:10,885 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [241810822] [2022-12-14 08:54:10,885 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:54:10,885 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:10,885 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:10,886 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:10,887 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-12-14 08:54:10,922 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-12-14 08:54:10,923 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:54:10,923 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 10 conjunts are in the unsatisfiable core [2022-12-14 08:54:10,925 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:54:11,002 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:11,002 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:54:11,058 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:11,058 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [241810822] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:54:11,058 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [472758082] [2022-12-14 08:54:11,060 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:54:11,060 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:54:11,061 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:54:11,061 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:54:11,061 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:54:11,125 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:54:11,282 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '811#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:54:11,282 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:54:11,283 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:54:11,283 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 15 [2022-12-14 08:54:11,283 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [643306314] [2022-12-14 08:54:11,283 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:54:11,283 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-12-14 08:54:11,283 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:11,284 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-12-14 08:54:11,284 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2022-12-14 08:54:11,284 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand has 16 states, 16 states have (on average 2.125) internal successors, (34), 15 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:11,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:11,334 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2022-12-14 08:54:11,334 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-12-14 08:54:11,334 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 15 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2022-12-14 08:54:11,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:11,335 INFO L225 Difference]: With dead ends: 34 [2022-12-14 08:54:11,335 INFO L226 Difference]: Without dead ends: 19 [2022-12-14 08:54:11,335 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 32 SyntacticMatches, 7 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 191 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=115, Invalid=485, Unknown=0, NotChecked=0, Total=600 [2022-12-14 08:54:11,336 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 7 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:11,336 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 38 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:54:11,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2022-12-14 08:54:11,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2022-12-14 08:54:11,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 18 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:11,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2022-12-14 08:54:11,338 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 17 [2022-12-14 08:54:11,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:11,338 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2022-12-14 08:54:11,338 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 15 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:11,338 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2022-12-14 08:54:11,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-12-14 08:54:11,339 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:11,339 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1] [2022-12-14 08:54:11,343 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-12-14 08:54:11,539 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:11,541 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:11,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:11,542 INFO L85 PathProgramCache]: Analyzing trace with hash -499972923, now seen corresponding path program 6 times [2022-12-14 08:54:11,542 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:11,542 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2132477194] [2022-12-14 08:54:11,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:11,543 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:11,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:11,729 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:11,729 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:11,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2132477194] [2022-12-14 08:54:11,729 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2132477194] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:11,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1449664241] [2022-12-14 08:54:11,729 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:54:11,729 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:11,729 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:11,730 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:11,731 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-12-14 08:54:11,761 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:54:11,761 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:54:11,762 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 14 conjunts are in the unsatisfiable core [2022-12-14 08:54:11,762 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:54:11,788 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:11,788 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:54:11,824 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:11,824 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1449664241] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:54:11,824 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1127219988] [2022-12-14 08:54:11,826 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:54:11,826 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:54:11,826 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:54:11,827 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:54:11,827 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:54:11,879 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:54:12,002 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1022#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:54:12,002 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:54:12,002 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:54:12,002 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 9 [2022-12-14 08:54:12,003 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [661451370] [2022-12-14 08:54:12,003 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:54:12,003 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-12-14 08:54:12,003 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:12,004 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-12-14 08:54:12,004 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2022-12-14 08:54:12,004 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:12,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:12,079 INFO L93 Difference]: Finished difference Result 30 states and 31 transitions. [2022-12-14 08:54:12,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-12-14 08:54:12,079 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 0 states have call successors, (0), 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 18 [2022-12-14 08:54:12,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:12,079 INFO L225 Difference]: With dead ends: 30 [2022-12-14 08:54:12,079 INFO L226 Difference]: Without dead ends: 28 [2022-12-14 08:54:12,080 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 41 SyntacticMatches, 8 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=107, Invalid=313, Unknown=0, NotChecked=0, Total=420 [2022-12-14 08:54:12,080 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 24 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:12,080 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 11 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:54:12,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-12-14 08:54:12,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 22. [2022-12-14 08:54:12,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 21 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:12,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2022-12-14 08:54:12,083 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 18 [2022-12-14 08:54:12,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:12,083 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2022-12-14 08:54:12,083 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:12,083 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2022-12-14 08:54:12,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-12-14 08:54:12,083 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:12,083 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1] [2022-12-14 08:54:12,088 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-12-14 08:54:12,284 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:12,285 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:12,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:12,287 INFO L85 PathProgramCache]: Analyzing trace with hash 258053716, now seen corresponding path program 7 times [2022-12-14 08:54:12,287 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:12,287 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1493939239] [2022-12-14 08:54:12,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:12,288 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:12,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:12,434 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:12,435 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:12,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1493939239] [2022-12-14 08:54:12,435 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1493939239] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:12,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [730115986] [2022-12-14 08:54:12,435 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:54:12,435 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:12,435 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:12,436 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:12,437 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-12-14 08:54:12,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:12,472 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 12 conjunts are in the unsatisfiable core [2022-12-14 08:54:12,474 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:54:12,550 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:12,550 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:54:12,610 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:12,610 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [730115986] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:54:12,610 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [140494052] [2022-12-14 08:54:12,611 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:54:12,612 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:54:12,612 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:54:12,612 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:54:12,612 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:54:12,663 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:54:12,812 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1261#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:54:12,812 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:54:12,812 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:54:12,812 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 18 [2022-12-14 08:54:12,813 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1720984377] [2022-12-14 08:54:12,813 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:54:12,813 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-12-14 08:54:12,813 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:12,814 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-12-14 08:54:12,814 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=449, Unknown=0, NotChecked=0, Total=552 [2022-12-14 08:54:12,814 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand has 19 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 18 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) [2022-12-14 08:54:12,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:12,907 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2022-12-14 08:54:12,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-12-14 08:54:12,907 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 18 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) Word has length 21 [2022-12-14 08:54:12,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:12,908 INFO L225 Difference]: With dead ends: 41 [2022-12-14 08:54:12,908 INFO L226 Difference]: Without dead ends: 23 [2022-12-14 08:54:12,909 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 41 SyntacticMatches, 9 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 273 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=155, Invalid=657, Unknown=0, NotChecked=0, Total=812 [2022-12-14 08:54:12,909 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 7 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:12,910 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 46 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:54:12,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-12-14 08:54:12,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2022-12-14 08:54:12,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 22 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:12,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2022-12-14 08:54:12,914 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 21 [2022-12-14 08:54:12,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:12,914 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2022-12-14 08:54:12,914 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 18 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) [2022-12-14 08:54:12,914 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2022-12-14 08:54:12,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-12-14 08:54:12,915 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:12,915 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 1, 1, 1, 1] [2022-12-14 08:54:12,920 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-12-14 08:54:13,115 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:13,117 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:13,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:13,118 INFO L85 PathProgramCache]: Analyzing trace with hash -460614833, now seen corresponding path program 8 times [2022-12-14 08:54:13,118 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:13,118 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1211180444] [2022-12-14 08:54:13,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:13,119 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:13,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:13,301 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 10 proven. 31 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:13,302 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:13,302 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1211180444] [2022-12-14 08:54:13,302 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1211180444] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:13,302 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [165329114] [2022-12-14 08:54:13,302 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:54:13,302 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:13,302 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:13,303 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:13,304 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-12-14 08:54:13,342 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-12-14 08:54:13,342 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:54:13,343 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 16 conjunts are in the unsatisfiable core [2022-12-14 08:54:13,344 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:54:13,375 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 15 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:13,375 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:54:13,424 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 15 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:13,424 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [165329114] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:54:13,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1720176772] [2022-12-14 08:54:13,425 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:54:13,425 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:54:13,426 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:54:13,426 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:54:13,426 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:54:13,476 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:54:13,656 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1518#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:54:13,656 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:54:13,656 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:54:13,656 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 10 [2022-12-14 08:54:13,656 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1812662802] [2022-12-14 08:54:13,657 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:54:13,657 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-12-14 08:54:13,657 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:13,657 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-12-14 08:54:13,658 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=183, Unknown=0, NotChecked=0, Total=240 [2022-12-14 08:54:13,658 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:13,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:13,732 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2022-12-14 08:54:13,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-12-14 08:54:13,732 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 0 states have call successors, (0), 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 22 [2022-12-14 08:54:13,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:13,733 INFO L225 Difference]: With dead ends: 34 [2022-12-14 08:54:13,733 INFO L226 Difference]: Without dead ends: 32 [2022-12-14 08:54:13,733 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 52 SyntacticMatches, 10 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 146 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=130, Invalid=376, Unknown=0, NotChecked=0, Total=506 [2022-12-14 08:54:13,734 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 28 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:13,734 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 13 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:54:13,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-12-14 08:54:13,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 26. [2022-12-14 08:54:13,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.08) internal successors, (27), 25 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) [2022-12-14 08:54:13,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2022-12-14 08:54:13,739 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 22 [2022-12-14 08:54:13,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:13,739 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2022-12-14 08:54:13,739 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:13,739 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2022-12-14 08:54:13,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-12-14 08:54:13,740 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:13,740 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 1, 1, 1, 1] [2022-12-14 08:54:13,744 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2022-12-14 08:54:13,940 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-12-14 08:54:13,941 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:13,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:13,942 INFO L85 PathProgramCache]: Analyzing trace with hash 248841098, now seen corresponding path program 9 times [2022-12-14 08:54:13,943 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:13,943 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [445443528] [2022-12-14 08:54:13,943 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:13,943 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:13,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:14,121 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 27 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:14,122 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:14,122 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [445443528] [2022-12-14 08:54:14,122 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [445443528] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:14,122 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1253672138] [2022-12-14 08:54:14,122 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:54:14,122 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:14,122 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:14,123 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:14,124 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-12-14 08:54:14,161 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:54:14,161 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:54:14,162 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 14 conjunts are in the unsatisfiable core [2022-12-14 08:54:14,163 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:54:14,263 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 40 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:14,263 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:54:14,327 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 40 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:14,328 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1253672138] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:54:14,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [910407308] [2022-12-14 08:54:14,329 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:54:14,329 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:54:14,330 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:54:14,330 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:54:14,330 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:54:14,378 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:54:14,514 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1800#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:54:14,514 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:54:14,514 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:54:14,514 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 21 [2022-12-14 08:54:14,514 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1542199112] [2022-12-14 08:54:14,514 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:54:14,514 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-12-14 08:54:14,514 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:14,515 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-12-14 08:54:14,515 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=571, Unknown=0, NotChecked=0, Total=702 [2022-12-14 08:54:14,515 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:14,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:14,578 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2022-12-14 08:54:14,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-12-14 08:54:14,578 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2022-12-14 08:54:14,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:14,579 INFO L225 Difference]: With dead ends: 48 [2022-12-14 08:54:14,579 INFO L226 Difference]: Without dead ends: 27 [2022-12-14 08:54:14,580 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 50 SyntacticMatches, 11 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 367 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=202, Invalid=854, Unknown=0, NotChecked=0, Total=1056 [2022-12-14 08:54:14,580 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 7 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 87 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:14,581 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 47 Invalid, 87 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 87 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:54:14,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-12-14 08:54:14,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-12-14 08:54:14,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.0769230769230769) internal successors, (28), 26 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:14,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2022-12-14 08:54:14,585 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 25 [2022-12-14 08:54:14,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:14,585 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2022-12-14 08:54:14,585 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:14,585 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2022-12-14 08:54:14,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-12-14 08:54:14,586 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:14,586 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 5, 1, 1, 1, 1] [2022-12-14 08:54:14,590 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-12-14 08:54:14,786 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:14,788 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:14,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:14,789 INFO L85 PathProgramCache]: Analyzing trace with hash 343018245, now seen corresponding path program 10 times [2022-12-14 08:54:14,789 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:14,789 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1256466207] [2022-12-14 08:54:14,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:14,790 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:14,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:14,966 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 15 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:14,966 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:14,966 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1256466207] [2022-12-14 08:54:14,966 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1256466207] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:14,966 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1730329846] [2022-12-14 08:54:14,966 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:54:14,967 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:14,967 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:14,967 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:14,968 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-12-14 08:54:15,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:15,002 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 18 conjunts are in the unsatisfiable core [2022-12-14 08:54:15,004 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:54:15,037 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 21 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:15,037 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:54:15,095 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 21 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:15,096 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1730329846] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:54:15,096 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [980740253] [2022-12-14 08:54:15,097 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:54:15,097 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:54:15,097 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:54:15,098 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:54:15,098 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:54:15,163 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:54:15,351 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2103#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:54:15,352 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:54:15,352 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:54:15,352 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 11 [2022-12-14 08:54:15,352 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [411802106] [2022-12-14 08:54:15,352 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:54:15,352 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-12-14 08:54:15,352 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:15,353 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-12-14 08:54:15,353 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=207, Unknown=0, NotChecked=0, Total=272 [2022-12-14 08:54:15,353 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand has 12 states, 12 states have (on average 2.5) internal successors, (30), 11 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:15,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:15,453 INFO L93 Difference]: Finished difference Result 38 states and 39 transitions. [2022-12-14 08:54:15,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-12-14 08:54:15,454 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.5) internal successors, (30), 11 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2022-12-14 08:54:15,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:15,454 INFO L225 Difference]: With dead ends: 38 [2022-12-14 08:54:15,454 INFO L226 Difference]: Without dead ends: 36 [2022-12-14 08:54:15,455 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 63 SyntacticMatches, 12 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 186 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=156, Invalid=444, Unknown=0, NotChecked=0, Total=600 [2022-12-14 08:54:15,455 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 34 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:15,456 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 17 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:54:15,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-12-14 08:54:15,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 30. [2022-12-14 08:54:15,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.0689655172413792) internal successors, (31), 29 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:15,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2022-12-14 08:54:15,460 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 26 [2022-12-14 08:54:15,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:15,460 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2022-12-14 08:54:15,460 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.5) internal successors, (30), 11 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:15,460 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2022-12-14 08:54:15,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-12-14 08:54:15,461 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:15,461 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 6, 1, 1, 1, 1] [2022-12-14 08:54:15,465 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-12-14 08:54:15,661 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-12-14 08:54:15,662 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:15,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:15,663 INFO L85 PathProgramCache]: Analyzing trace with hash 1134159892, now seen corresponding path program 11 times [2022-12-14 08:54:15,663 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:15,664 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1996152144] [2022-12-14 08:54:15,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:15,664 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:15,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:15,807 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 41 proven. 37 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:15,807 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:15,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1996152144] [2022-12-14 08:54:15,808 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1996152144] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:15,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [615387789] [2022-12-14 08:54:15,808 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:54:15,808 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:15,808 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:15,809 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:15,810 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-12-14 08:54:15,846 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-12-14 08:54:15,846 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:54:15,847 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 16 conjunts are in the unsatisfiable core [2022-12-14 08:54:15,848 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:54:15,968 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 57 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:15,969 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:54:16,058 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 57 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:16,058 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [615387789] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:54:16,058 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2102199275] [2022-12-14 08:54:16,059 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:54:16,060 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:54:16,060 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:54:16,060 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:54:16,060 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:54:16,123 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:54:16,277 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2428#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:54:16,277 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:54:16,277 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:54:16,277 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 24 [2022-12-14 08:54:16,277 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1559745189] [2022-12-14 08:54:16,277 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:54:16,278 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-12-14 08:54:16,278 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:16,278 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-12-14 08:54:16,279 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=707, Unknown=0, NotChecked=0, Total=870 [2022-12-14 08:54:16,279 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand has 25 states, 25 states have (on average 2.2) internal successors, (55), 24 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:16,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:16,368 INFO L93 Difference]: Finished difference Result 55 states and 57 transitions. [2022-12-14 08:54:16,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-12-14 08:54:16,368 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.2) internal successors, (55), 24 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2022-12-14 08:54:16,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:16,368 INFO L225 Difference]: With dead ends: 55 [2022-12-14 08:54:16,368 INFO L226 Difference]: Without dead ends: 31 [2022-12-14 08:54:16,369 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 59 SyntacticMatches, 13 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 473 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=256, Invalid=1076, Unknown=0, NotChecked=0, Total=1332 [2022-12-14 08:54:16,369 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 7 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:16,369 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 58 Invalid, 108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 108 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:54:16,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-12-14 08:54:16,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2022-12-14 08:54:16,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 30 states have (on average 1.0666666666666667) internal successors, (32), 30 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) [2022-12-14 08:54:16,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2022-12-14 08:54:16,372 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 29 [2022-12-14 08:54:16,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:16,372 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2022-12-14 08:54:16,372 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.2) internal successors, (55), 24 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:16,372 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2022-12-14 08:54:16,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-12-14 08:54:16,373 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:16,373 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 6, 6, 1, 1, 1, 1] [2022-12-14 08:54:16,378 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2022-12-14 08:54:16,573 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:16,574 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:16,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:16,575 INFO L85 PathProgramCache]: Analyzing trace with hash -1675576817, now seen corresponding path program 12 times [2022-12-14 08:54:16,576 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:16,576 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [713257720] [2022-12-14 08:54:16,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:16,577 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:16,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:16,755 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 21 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:16,755 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:16,756 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [713257720] [2022-12-14 08:54:16,756 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [713257720] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:16,756 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1594334044] [2022-12-14 08:54:16,756 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:54:16,756 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:16,756 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:16,757 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:16,758 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-12-14 08:54:16,793 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:54:16,793 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:54:16,794 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 20 conjunts are in the unsatisfiable core [2022-12-14 08:54:16,795 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:54:16,842 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 28 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:16,842 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:54:16,917 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 28 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:16,917 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1594334044] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:54:16,917 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [143604516] [2022-12-14 08:54:16,919 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:54:16,919 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:54:16,919 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:54:16,919 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:54:16,919 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:54:16,975 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:54:17,080 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2777#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:54:17,080 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:54:17,080 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:54:17,080 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 12 [2022-12-14 08:54:17,080 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [926766281] [2022-12-14 08:54:17,081 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:54:17,081 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-12-14 08:54:17,081 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:17,081 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-12-14 08:54:17,081 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=232, Unknown=0, NotChecked=0, Total=306 [2022-12-14 08:54:17,081 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand has 13 states, 13 states have (on average 2.6153846153846154) internal successors, (34), 12 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:17,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:17,162 INFO L93 Difference]: Finished difference Result 42 states and 43 transitions. [2022-12-14 08:54:17,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-12-14 08:54:17,163 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.6153846153846154) internal successors, (34), 12 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2022-12-14 08:54:17,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:17,163 INFO L225 Difference]: With dead ends: 42 [2022-12-14 08:54:17,163 INFO L226 Difference]: Without dead ends: 40 [2022-12-14 08:54:17,163 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 74 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=185, Invalid=517, Unknown=0, NotChecked=0, Total=702 [2022-12-14 08:54:17,164 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 36 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:17,164 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 13 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 79 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:54:17,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-12-14 08:54:17,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 34. [2022-12-14 08:54:17,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 33 states have (on average 1.0606060606060606) internal successors, (35), 33 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:17,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2022-12-14 08:54:17,167 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 30 [2022-12-14 08:54:17,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:17,167 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2022-12-14 08:54:17,167 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.6153846153846154) internal successors, (34), 12 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:17,168 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2022-12-14 08:54:17,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-12-14 08:54:17,168 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:17,168 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 7, 1, 1, 1, 1] [2022-12-14 08:54:17,173 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-12-14 08:54:17,369 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:17,369 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:17,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:17,369 INFO L85 PathProgramCache]: Analyzing trace with hash -994220854, now seen corresponding path program 13 times [2022-12-14 08:54:17,369 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:17,370 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [899729951] [2022-12-14 08:54:17,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:17,370 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:17,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:17,542 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 58 proven. 47 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:17,543 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:17,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [899729951] [2022-12-14 08:54:17,543 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [899729951] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:17,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [768095904] [2022-12-14 08:54:17,543 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:54:17,543 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:17,543 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:17,544 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:17,545 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-12-14 08:54:17,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:17,578 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 18 conjunts are in the unsatisfiable core [2022-12-14 08:54:17,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:54:17,693 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 77 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:17,694 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:54:17,783 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 77 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:17,783 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [768095904] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:54:17,783 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1961922306] [2022-12-14 08:54:17,784 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:54:17,784 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:54:17,785 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:54:17,785 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:54:17,785 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:54:17,833 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:54:17,959 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3145#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:54:17,959 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:54:17,960 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:54:17,960 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 27 [2022-12-14 08:54:17,960 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2091710149] [2022-12-14 08:54:17,960 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:54:17,960 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-12-14 08:54:17,960 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:17,961 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-12-14 08:54:17,961 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=857, Unknown=0, NotChecked=0, Total=1056 [2022-12-14 08:54:17,961 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand has 28 states, 28 states have (on average 2.2142857142857144) internal successors, (62), 27 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) [2022-12-14 08:54:18,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:18,073 INFO L93 Difference]: Finished difference Result 62 states and 64 transitions. [2022-12-14 08:54:18,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-12-14 08:54:18,074 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.2142857142857144) internal successors, (62), 27 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) Word has length 33 [2022-12-14 08:54:18,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:18,074 INFO L225 Difference]: With dead ends: 62 [2022-12-14 08:54:18,074 INFO L226 Difference]: Without dead ends: 35 [2022-12-14 08:54:18,075 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 68 SyntacticMatches, 15 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 591 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=317, Invalid=1323, Unknown=0, NotChecked=0, Total=1640 [2022-12-14 08:54:18,075 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 7 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:18,076 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 61 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 112 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:54:18,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-12-14 08:54:18,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2022-12-14 08:54:18,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.0588235294117647) internal successors, (36), 34 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:18,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2022-12-14 08:54:18,081 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 33 [2022-12-14 08:54:18,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:18,081 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2022-12-14 08:54:18,081 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.2142857142857144) internal successors, (62), 27 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) [2022-12-14 08:54:18,081 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2022-12-14 08:54:18,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-12-14 08:54:18,082 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:18,082 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 7, 7, 1, 1, 1, 1] [2022-12-14 08:54:18,086 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2022-12-14 08:54:18,283 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-12-14 08:54:18,284 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:18,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:18,285 INFO L85 PathProgramCache]: Analyzing trace with hash -112934587, now seen corresponding path program 14 times [2022-12-14 08:54:18,285 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:18,285 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1295805012] [2022-12-14 08:54:18,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:18,286 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:18,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:18,426 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 28 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:18,426 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:18,426 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1295805012] [2022-12-14 08:54:18,426 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1295805012] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:18,426 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1699224221] [2022-12-14 08:54:18,426 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:54:18,427 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:18,427 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:18,427 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:18,428 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-12-14 08:54:18,467 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2022-12-14 08:54:18,467 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:54:18,468 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 22 conjunts are in the unsatisfiable core [2022-12-14 08:54:18,470 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:54:18,513 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 36 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:18,513 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:54:18,595 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 36 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:18,595 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1699224221] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:54:18,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [577031270] [2022-12-14 08:54:18,596 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:54:18,596 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:54:18,596 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:54:18,597 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:54:18,597 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:54:18,675 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:54:18,827 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3540#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:54:18,827 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:54:18,828 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:54:18,828 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 13 [2022-12-14 08:54:18,828 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2117158697] [2022-12-14 08:54:18,828 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:54:18,828 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-12-14 08:54:18,828 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:18,829 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-12-14 08:54:18,829 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=258, Unknown=0, NotChecked=0, Total=342 [2022-12-14 08:54:18,829 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand has 14 states, 14 states have (on average 2.7142857142857144) internal successors, (38), 13 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:18,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:18,928 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2022-12-14 08:54:18,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-12-14 08:54:18,928 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.7142857142857144) internal successors, (38), 13 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2022-12-14 08:54:18,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:18,929 INFO L225 Difference]: With dead ends: 46 [2022-12-14 08:54:18,929 INFO L226 Difference]: Without dead ends: 44 [2022-12-14 08:54:18,929 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 85 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 278 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=217, Invalid=595, Unknown=0, NotChecked=0, Total=812 [2022-12-14 08:54:18,929 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 42 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:18,930 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 13 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:54:18,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-12-14 08:54:18,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 38. [2022-12-14 08:54:18,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 37 states have (on average 1.054054054054054) internal successors, (39), 37 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:18,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 39 transitions. [2022-12-14 08:54:18,935 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 39 transitions. Word has length 34 [2022-12-14 08:54:18,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:18,935 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 39 transitions. [2022-12-14 08:54:18,935 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.7142857142857144) internal successors, (38), 13 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:18,935 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 39 transitions. [2022-12-14 08:54:18,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-12-14 08:54:18,935 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:18,935 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 8, 1, 1, 1, 1] [2022-12-14 08:54:18,939 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2022-12-14 08:54:19,136 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-12-14 08:54:19,137 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:19,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:19,138 INFO L85 PathProgramCache]: Analyzing trace with hash -1470068268, now seen corresponding path program 15 times [2022-12-14 08:54:19,138 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:19,138 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1164601147] [2022-12-14 08:54:19,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:19,139 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:19,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:19,361 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 78 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:19,361 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:19,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1164601147] [2022-12-14 08:54:19,361 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1164601147] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:19,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1292629429] [2022-12-14 08:54:19,361 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:54:19,362 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:19,362 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:19,362 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:19,363 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-12-14 08:54:19,400 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:54:19,400 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:54:19,401 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 20 conjunts are in the unsatisfiable core [2022-12-14 08:54:19,402 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:54:19,585 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 100 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:19,585 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:54:19,716 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 100 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:19,716 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1292629429] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:54:19,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [970556721] [2022-12-14 08:54:19,717 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:54:19,717 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:54:19,717 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:54:19,718 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:54:19,718 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:54:19,761 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:54:19,965 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3951#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:54:19,965 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:54:19,965 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:54:19,965 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 30 [2022-12-14 08:54:19,966 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [299330209] [2022-12-14 08:54:19,966 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:54:19,966 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-12-14 08:54:19,966 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:19,967 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-12-14 08:54:19,967 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=239, Invalid=1021, Unknown=0, NotChecked=0, Total=1260 [2022-12-14 08:54:19,967 INFO L87 Difference]: Start difference. First operand 38 states and 39 transitions. Second operand has 31 states, 31 states have (on average 2.225806451612903) internal successors, (69), 30 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:20,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:20,102 INFO L93 Difference]: Finished difference Result 69 states and 71 transitions. [2022-12-14 08:54:20,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-12-14 08:54:20,102 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.225806451612903) internal successors, (69), 30 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 37 [2022-12-14 08:54:20,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:20,102 INFO L225 Difference]: With dead ends: 69 [2022-12-14 08:54:20,102 INFO L226 Difference]: Without dead ends: 39 [2022-12-14 08:54:20,103 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 77 SyntacticMatches, 17 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 721 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=385, Invalid=1595, Unknown=0, NotChecked=0, Total=1980 [2022-12-14 08:54:20,103 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 7 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 164 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 164 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 164 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:20,103 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 86 Invalid, 164 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 164 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:54:20,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2022-12-14 08:54:20,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2022-12-14 08:54:20,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 38 states have (on average 1.0526315789473684) internal successors, (40), 38 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:20,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2022-12-14 08:54:20,107 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 37 [2022-12-14 08:54:20,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:20,107 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2022-12-14 08:54:20,107 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 2.225806451612903) internal successors, (69), 30 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:20,107 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2022-12-14 08:54:20,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-12-14 08:54:20,108 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:20,108 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 8, 8, 1, 1, 1, 1] [2022-12-14 08:54:20,111 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2022-12-14 08:54:20,308 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:20,309 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:20,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:20,310 INFO L85 PathProgramCache]: Analyzing trace with hash 1486827727, now seen corresponding path program 16 times [2022-12-14 08:54:20,310 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:20,310 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [285928835] [2022-12-14 08:54:20,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:20,311 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:20,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:20,457 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 36 proven. 109 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:20,457 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:20,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [285928835] [2022-12-14 08:54:20,457 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [285928835] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:20,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [679808614] [2022-12-14 08:54:20,457 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:54:20,457 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:20,457 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:20,458 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:20,459 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-12-14 08:54:20,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:20,502 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 24 conjunts are in the unsatisfiable core [2022-12-14 08:54:20,503 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:54:20,546 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 45 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:20,546 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:54:20,634 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 45 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:20,634 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [679808614] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:54:20,635 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [651506561] [2022-12-14 08:54:20,636 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:54:20,636 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:54:20,636 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:54:20,636 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:54:20,636 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:54:20,685 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:54:20,837 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4392#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:54:20,837 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:54:20,837 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:54:20,837 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 14 [2022-12-14 08:54:20,837 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [466738328] [2022-12-14 08:54:20,837 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:54:20,838 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-12-14 08:54:20,838 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:20,838 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-12-14 08:54:20,838 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=285, Unknown=0, NotChecked=0, Total=380 [2022-12-14 08:54:20,838 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand has 15 states, 15 states have (on average 2.8) internal successors, (42), 14 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:20,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:20,977 INFO L93 Difference]: Finished difference Result 50 states and 51 transitions. [2022-12-14 08:54:20,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-12-14 08:54:20,977 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.8) internal successors, (42), 14 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) Word has length 38 [2022-12-14 08:54:20,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:20,978 INFO L225 Difference]: With dead ends: 50 [2022-12-14 08:54:20,978 INFO L226 Difference]: Without dead ends: 48 [2022-12-14 08:54:20,979 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 96 SyntacticMatches, 18 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 330 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=252, Invalid=678, Unknown=0, NotChecked=0, Total=930 [2022-12-14 08:54:20,979 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 26 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:20,980 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 16 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 109 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:54:20,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-12-14 08:54:20,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 42. [2022-12-14 08:54:20,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 41 states have (on average 1.048780487804878) internal successors, (43), 41 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:20,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2022-12-14 08:54:20,985 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 38 [2022-12-14 08:54:20,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:20,985 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2022-12-14 08:54:20,985 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.8) internal successors, (42), 14 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:20,985 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2022-12-14 08:54:20,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-12-14 08:54:20,985 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:20,985 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 9, 1, 1, 1, 1] [2022-12-14 08:54:20,989 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2022-12-14 08:54:21,186 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-12-14 08:54:21,187 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:21,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:21,188 INFO L85 PathProgramCache]: Analyzing trace with hash 91911690, now seen corresponding path program 17 times [2022-12-14 08:54:21,188 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:21,189 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1544172205] [2022-12-14 08:54:21,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:21,189 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:21,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:21,411 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 101 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:21,411 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:21,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1544172205] [2022-12-14 08:54:21,411 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1544172205] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:21,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [458030812] [2022-12-14 08:54:21,412 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:54:21,412 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:21,412 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:21,412 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:21,413 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-12-14 08:54:21,456 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2022-12-14 08:54:21,456 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:54:21,457 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 22 conjunts are in the unsatisfiable core [2022-12-14 08:54:21,458 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:54:21,650 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 126 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:21,650 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:54:21,780 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 126 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:21,780 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [458030812] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:54:21,781 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1628125379] [2022-12-14 08:54:21,781 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:54:21,781 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:54:21,781 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:54:21,782 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:54:21,782 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:54:21,830 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:54:22,019 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4846#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:54:22,019 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:54:22,019 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:54:22,019 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 33 [2022-12-14 08:54:22,019 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [289684276] [2022-12-14 08:54:22,019 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:54:22,019 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-12-14 08:54:22,019 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:22,020 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-12-14 08:54:22,020 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=283, Invalid=1199, Unknown=0, NotChecked=0, Total=1482 [2022-12-14 08:54:22,020 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand has 34 states, 34 states have (on average 2.235294117647059) internal successors, (76), 33 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:22,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:22,185 INFO L93 Difference]: Finished difference Result 76 states and 78 transitions. [2022-12-14 08:54:22,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-12-14 08:54:22,185 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.235294117647059) internal successors, (76), 33 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2022-12-14 08:54:22,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:22,186 INFO L225 Difference]: With dead ends: 76 [2022-12-14 08:54:22,186 INFO L226 Difference]: Without dead ends: 43 [2022-12-14 08:54:22,186 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 86 SyntacticMatches, 19 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 863 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=460, Invalid=1892, Unknown=0, NotChecked=0, Total=2352 [2022-12-14 08:54:22,187 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 7 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 203 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 203 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 203 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:22,187 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 105 Invalid, 203 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 203 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:54:22,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-12-14 08:54:22,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2022-12-14 08:54:22,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 42 states have (on average 1.0476190476190477) internal successors, (44), 42 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:22,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2022-12-14 08:54:22,191 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 41 [2022-12-14 08:54:22,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:22,191 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2022-12-14 08:54:22,191 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 2.235294117647059) internal successors, (76), 33 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:22,191 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2022-12-14 08:54:22,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-12-14 08:54:22,191 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:22,191 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 9, 9, 1, 1, 1, 1] [2022-12-14 08:54:22,196 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2022-12-14 08:54:22,391 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:22,392 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:22,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:22,392 INFO L85 PathProgramCache]: Analyzing trace with hash -1748555899, now seen corresponding path program 18 times [2022-12-14 08:54:22,392 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:22,392 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1193651526] [2022-12-14 08:54:22,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:22,392 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:22,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:22,534 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 45 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:22,534 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:22,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1193651526] [2022-12-14 08:54:22,535 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1193651526] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:22,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1499041745] [2022-12-14 08:54:22,535 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:54:22,535 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:22,535 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:22,536 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:22,537 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-12-14 08:54:22,577 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:54:22,577 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:54:22,578 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 26 conjunts are in the unsatisfiable core [2022-12-14 08:54:22,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:54:22,629 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 55 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:22,629 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:54:22,757 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 55 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:22,758 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1499041745] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:54:22,758 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [630793067] [2022-12-14 08:54:22,759 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:54:22,759 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:54:22,759 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:54:22,759 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:54:22,759 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:54:22,809 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:54:22,974 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5333#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:54:22,974 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:54:22,974 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:54:22,974 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 15 [2022-12-14 08:54:22,974 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1771977143] [2022-12-14 08:54:22,974 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:54:22,974 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-12-14 08:54:22,975 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:22,975 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-12-14 08:54:22,975 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=313, Unknown=0, NotChecked=0, Total=420 [2022-12-14 08:54:22,975 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand has 16 states, 16 states have (on average 2.875) internal successors, (46), 15 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:23,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:23,087 INFO L93 Difference]: Finished difference Result 54 states and 55 transitions. [2022-12-14 08:54:23,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-12-14 08:54:23,088 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.875) internal successors, (46), 15 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2022-12-14 08:54:23,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:23,088 INFO L225 Difference]: With dead ends: 54 [2022-12-14 08:54:23,088 INFO L226 Difference]: Without dead ends: 52 [2022-12-14 08:54:23,088 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 107 SyntacticMatches, 20 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 386 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=290, Invalid=766, Unknown=0, NotChecked=0, Total=1056 [2022-12-14 08:54:23,089 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 48 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 105 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:23,089 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [48 Valid, 11 Invalid, 105 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:54:23,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-12-14 08:54:23,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 46. [2022-12-14 08:54:23,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 45 states have (on average 1.0444444444444445) internal successors, (47), 45 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:23,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2022-12-14 08:54:23,093 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 42 [2022-12-14 08:54:23,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:23,093 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2022-12-14 08:54:23,093 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.875) internal successors, (46), 15 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:23,094 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2022-12-14 08:54:23,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-12-14 08:54:23,094 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:23,094 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 10, 1, 1, 1, 1] [2022-12-14 08:54:23,098 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2022-12-14 08:54:23,295 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:23,295 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:23,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:23,296 INFO L85 PathProgramCache]: Analyzing trace with hash -1860600940, now seen corresponding path program 19 times [2022-12-14 08:54:23,297 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:23,297 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1326944381] [2022-12-14 08:54:23,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:23,297 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:23,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:23,531 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 127 proven. 83 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:23,531 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:23,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1326944381] [2022-12-14 08:54:23,531 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1326944381] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:23,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1200551985] [2022-12-14 08:54:23,531 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:54:23,531 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:23,532 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:23,532 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:23,533 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-12-14 08:54:23,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:23,572 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 24 conjunts are in the unsatisfiable core [2022-12-14 08:54:23,573 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:54:23,759 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 155 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:23,759 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:54:23,907 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 155 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:23,907 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1200551985] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:54:23,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [818568749] [2022-12-14 08:54:23,908 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:54:23,908 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:54:23,908 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:54:23,908 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:54:23,909 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:54:23,953 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:54:24,135 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5830#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:54:24,135 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:54:24,135 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:54:24,135 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 36 [2022-12-14 08:54:24,135 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [609874845] [2022-12-14 08:54:24,135 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:54:24,136 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-12-14 08:54:24,136 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:24,136 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-12-14 08:54:24,136 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=1391, Unknown=0, NotChecked=0, Total=1722 [2022-12-14 08:54:24,136 INFO L87 Difference]: Start difference. First operand 46 states and 47 transitions. Second operand has 37 states, 37 states have (on average 2.2432432432432434) internal successors, (83), 36 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:24,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:24,297 INFO L93 Difference]: Finished difference Result 83 states and 85 transitions. [2022-12-14 08:54:24,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-12-14 08:54:24,297 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.2432432432432434) internal successors, (83), 36 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 45 [2022-12-14 08:54:24,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:24,297 INFO L225 Difference]: With dead ends: 83 [2022-12-14 08:54:24,297 INFO L226 Difference]: Without dead ends: 47 [2022-12-14 08:54:24,299 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 95 SyntacticMatches, 21 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1017 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=542, Invalid=2214, Unknown=0, NotChecked=0, Total=2756 [2022-12-14 08:54:24,299 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 7 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 199 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 199 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 199 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:24,300 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 107 Invalid, 199 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 199 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:54:24,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-12-14 08:54:24,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2022-12-14 08:54:24,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 1.0434782608695652) internal successors, (48), 46 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:24,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2022-12-14 08:54:24,306 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 45 [2022-12-14 08:54:24,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:24,307 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2022-12-14 08:54:24,307 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 2.2432432432432434) internal successors, (83), 36 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:24,307 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2022-12-14 08:54:24,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-12-14 08:54:24,307 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:24,307 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 10, 10, 1, 1, 1, 1] [2022-12-14 08:54:24,312 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2022-12-14 08:54:24,508 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2022-12-14 08:54:24,509 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:24,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:24,510 INFO L85 PathProgramCache]: Analyzing trace with hash -496306289, now seen corresponding path program 20 times [2022-12-14 08:54:24,510 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:24,510 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1341449669] [2022-12-14 08:54:24,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:24,510 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:24,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:24,687 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 55 proven. 166 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:24,687 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:24,687 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1341449669] [2022-12-14 08:54:24,687 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1341449669] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:24,687 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2033163936] [2022-12-14 08:54:24,687 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:54:24,687 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:24,687 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:24,688 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:24,689 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-12-14 08:54:24,740 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2022-12-14 08:54:24,740 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:54:24,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 28 conjunts are in the unsatisfiable core [2022-12-14 08:54:24,743 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:54:24,790 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 66 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:24,790 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:54:24,912 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 66 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:24,912 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2033163936] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:54:24,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1792604762] [2022-12-14 08:54:24,913 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:54:24,913 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:54:24,913 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:54:24,913 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:54:24,913 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:54:24,960 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:54:25,151 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6363#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:54:25,151 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:54:25,152 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:54:25,152 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 16 [2022-12-14 08:54:25,152 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [317516359] [2022-12-14 08:54:25,152 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:54:25,152 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-12-14 08:54:25,152 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:25,153 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-12-14 08:54:25,153 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=342, Unknown=0, NotChecked=0, Total=462 [2022-12-14 08:54:25,153 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand has 17 states, 17 states have (on average 2.9411764705882355) internal successors, (50), 16 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:25,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:25,288 INFO L93 Difference]: Finished difference Result 58 states and 59 transitions. [2022-12-14 08:54:25,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-12-14 08:54:25,288 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.9411764705882355) internal successors, (50), 16 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2022-12-14 08:54:25,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:25,288 INFO L225 Difference]: With dead ends: 58 [2022-12-14 08:54:25,288 INFO L226 Difference]: Without dead ends: 56 [2022-12-14 08:54:25,289 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 118 SyntacticMatches, 22 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 446 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=331, Invalid=859, Unknown=0, NotChecked=0, Total=1190 [2022-12-14 08:54:25,289 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 52 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:25,289 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [52 Valid, 11 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 108 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:54:25,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-12-14 08:54:25,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 50. [2022-12-14 08:54:25,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.0408163265306123) internal successors, (51), 49 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:25,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 51 transitions. [2022-12-14 08:54:25,294 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 51 transitions. Word has length 46 [2022-12-14 08:54:25,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:25,294 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 51 transitions. [2022-12-14 08:54:25,294 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.9411764705882355) internal successors, (50), 16 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:25,294 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 51 transitions. [2022-12-14 08:54:25,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-12-14 08:54:25,294 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:25,294 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 11, 1, 1, 1, 1] [2022-12-14 08:54:25,298 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2022-12-14 08:54:25,495 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:25,495 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:25,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:25,496 INFO L85 PathProgramCache]: Analyzing trace with hash 2116564810, now seen corresponding path program 21 times [2022-12-14 08:54:25,496 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:25,496 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1117694325] [2022-12-14 08:54:25,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:25,497 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:25,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:25,750 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 156 proven. 97 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:25,750 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:25,751 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1117694325] [2022-12-14 08:54:25,751 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1117694325] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:25,751 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1073349358] [2022-12-14 08:54:25,751 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:54:25,751 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:25,751 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:25,752 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:25,752 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-12-14 08:54:25,791 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:54:25,791 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:54:25,792 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 26 conjunts are in the unsatisfiable core [2022-12-14 08:54:25,793 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:54:26,072 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 187 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:26,072 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:54:26,222 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 187 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:26,222 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1073349358] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:54:26,222 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [506618601] [2022-12-14 08:54:26,223 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:54:26,223 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:54:26,223 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:54:26,223 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:54:26,223 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:54:26,275 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:54:26,466 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6903#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:54:26,466 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:54:26,466 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:54:26,466 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 39 [2022-12-14 08:54:26,467 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [873423464] [2022-12-14 08:54:26,467 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:54:26,467 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-12-14 08:54:26,467 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:26,467 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-12-14 08:54:26,468 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=383, Invalid=1597, Unknown=0, NotChecked=0, Total=1980 [2022-12-14 08:54:26,468 INFO L87 Difference]: Start difference. First operand 50 states and 51 transitions. Second operand has 40 states, 40 states have (on average 2.25) internal successors, (90), 39 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:26,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:26,678 INFO L93 Difference]: Finished difference Result 90 states and 92 transitions. [2022-12-14 08:54:26,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-12-14 08:54:26,678 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.25) internal successors, (90), 39 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2022-12-14 08:54:26,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:26,678 INFO L225 Difference]: With dead ends: 90 [2022-12-14 08:54:26,678 INFO L226 Difference]: Without dead ends: 51 [2022-12-14 08:54:26,679 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 104 SyntacticMatches, 23 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1183 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=631, Invalid=2561, Unknown=0, NotChecked=0, Total=3192 [2022-12-14 08:54:26,679 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 7 mSDsluCounter, 126 mSDsCounter, 0 mSdLazyCounter, 257 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 139 SdHoareTripleChecker+Invalid, 257 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 257 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:26,679 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 139 Invalid, 257 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 257 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:54:26,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-12-14 08:54:26,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2022-12-14 08:54:26,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 50 states have (on average 1.04) internal successors, (52), 50 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:26,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2022-12-14 08:54:26,687 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 49 [2022-12-14 08:54:26,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:26,687 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2022-12-14 08:54:26,687 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 2.25) internal successors, (90), 39 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:26,688 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2022-12-14 08:54:26,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-12-14 08:54:26,688 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:26,688 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 11, 11, 1, 1, 1, 1] [2022-12-14 08:54:26,692 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2022-12-14 08:54:26,889 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2022-12-14 08:54:26,889 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:26,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:26,891 INFO L85 PathProgramCache]: Analyzing trace with hash -1844101691, now seen corresponding path program 22 times [2022-12-14 08:54:26,891 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:26,892 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1756268202] [2022-12-14 08:54:26,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:26,893 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:26,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:27,090 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 66 proven. 199 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:27,090 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:27,090 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1756268202] [2022-12-14 08:54:27,091 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1756268202] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:27,091 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [190080026] [2022-12-14 08:54:27,091 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:54:27,091 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:27,091 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:27,092 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:27,093 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-12-14 08:54:27,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:27,137 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 30 conjunts are in the unsatisfiable core [2022-12-14 08:54:27,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:54:27,194 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 78 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:27,194 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:54:27,318 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 78 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:27,318 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [190080026] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:54:27,318 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1403086920] [2022-12-14 08:54:27,319 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:54:27,319 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:54:27,319 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:54:27,319 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:54:27,319 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:54:27,372 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:54:27,556 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7482#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:54:27,556 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:54:27,556 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:54:27,556 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 17 [2022-12-14 08:54:27,556 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [669071572] [2022-12-14 08:54:27,556 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:54:27,557 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-12-14 08:54:27,557 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:27,557 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-12-14 08:54:27,557 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2022-12-14 08:54:27,558 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand has 18 states, 18 states have (on average 3.0) internal successors, (54), 17 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:27,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:27,723 INFO L93 Difference]: Finished difference Result 62 states and 63 transitions. [2022-12-14 08:54:27,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-12-14 08:54:27,723 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.0) internal successors, (54), 17 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2022-12-14 08:54:27,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:27,724 INFO L225 Difference]: With dead ends: 62 [2022-12-14 08:54:27,724 INFO L226 Difference]: Without dead ends: 60 [2022-12-14 08:54:27,724 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 129 SyntacticMatches, 24 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 510 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=375, Invalid=957, Unknown=0, NotChecked=0, Total=1332 [2022-12-14 08:54:27,725 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 34 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 139 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 142 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 139 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:27,725 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 20 Invalid, 142 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 139 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:54:27,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2022-12-14 08:54:27,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 54. [2022-12-14 08:54:27,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 53 states have (on average 1.0377358490566038) internal successors, (55), 53 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:27,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2022-12-14 08:54:27,731 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 50 [2022-12-14 08:54:27,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:27,731 INFO L495 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2022-12-14 08:54:27,731 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 3.0) internal successors, (54), 17 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:27,731 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2022-12-14 08:54:27,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-12-14 08:54:27,731 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:27,731 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 12, 1, 1, 1, 1] [2022-12-14 08:54:27,736 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-12-14 08:54:27,932 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:27,933 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:27,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:27,933 INFO L85 PathProgramCache]: Analyzing trace with hash -701973164, now seen corresponding path program 23 times [2022-12-14 08:54:27,934 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:27,934 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1955336085] [2022-12-14 08:54:27,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:27,935 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:27,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:28,232 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 188 proven. 112 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:28,233 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:28,233 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1955336085] [2022-12-14 08:54:28,233 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1955336085] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:28,233 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [619692456] [2022-12-14 08:54:28,233 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:54:28,233 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:28,233 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:28,234 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:28,235 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-12-14 08:54:28,279 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2022-12-14 08:54:28,279 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:54:28,280 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 28 conjunts are in the unsatisfiable core [2022-12-14 08:54:28,281 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:54:28,605 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 222 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:28,605 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:54:28,809 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 222 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:28,809 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [619692456] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:54:28,809 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1358647435] [2022-12-14 08:54:28,810 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:54:28,810 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:54:28,810 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:54:28,810 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:54:28,810 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:54:28,856 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:54:29,009 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8065#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:54:29,009 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:54:29,009 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:54:29,010 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 42 [2022-12-14 08:54:29,010 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [471444685] [2022-12-14 08:54:29,010 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:54:29,010 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-12-14 08:54:29,010 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:29,010 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-12-14 08:54:29,011 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=439, Invalid=1817, Unknown=0, NotChecked=0, Total=2256 [2022-12-14 08:54:29,011 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand has 43 states, 43 states have (on average 2.255813953488372) internal successors, (97), 42 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) [2022-12-14 08:54:29,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:29,225 INFO L93 Difference]: Finished difference Result 97 states and 99 transitions. [2022-12-14 08:54:29,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-12-14 08:54:29,225 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.255813953488372) internal successors, (97), 42 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) Word has length 53 [2022-12-14 08:54:29,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:29,226 INFO L225 Difference]: With dead ends: 97 [2022-12-14 08:54:29,226 INFO L226 Difference]: Without dead ends: 55 [2022-12-14 08:54:29,228 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 113 SyntacticMatches, 25 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1361 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=727, Invalid=2933, Unknown=0, NotChecked=0, Total=3660 [2022-12-14 08:54:29,228 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 7 mSDsluCounter, 116 mSDsCounter, 0 mSdLazyCounter, 250 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 130 SdHoareTripleChecker+Invalid, 250 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 250 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:29,228 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 130 Invalid, 250 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 250 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:54:29,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-12-14 08:54:29,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2022-12-14 08:54:29,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.037037037037037) internal successors, (56), 54 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:29,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2022-12-14 08:54:29,237 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 53 [2022-12-14 08:54:29,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:29,237 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2022-12-14 08:54:29,237 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 2.255813953488372) internal successors, (97), 42 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) [2022-12-14 08:54:29,237 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2022-12-14 08:54:29,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-12-14 08:54:29,237 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:29,238 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 12, 12, 1, 1, 1, 1] [2022-12-14 08:54:29,241 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2022-12-14 08:54:29,438 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:29,439 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:29,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:29,440 INFO L85 PathProgramCache]: Analyzing trace with hash -2031612337, now seen corresponding path program 24 times [2022-12-14 08:54:29,440 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:29,440 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [504625236] [2022-12-14 08:54:29,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:29,441 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:29,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:29,652 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 78 proven. 235 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:29,652 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:29,652 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [504625236] [2022-12-14 08:54:29,652 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [504625236] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:29,652 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1204497878] [2022-12-14 08:54:29,652 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:54:29,652 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:29,652 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:29,653 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:29,654 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-12-14 08:54:29,694 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:54:29,694 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:54:29,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 32 conjunts are in the unsatisfiable core [2022-12-14 08:54:29,696 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:54:29,743 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 91 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:29,743 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:54:29,885 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 91 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:29,885 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1204497878] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:54:29,885 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1144513931] [2022-12-14 08:54:29,886 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:54:29,886 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:54:29,886 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:54:29,886 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:54:29,886 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:54:29,934 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:54:30,114 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8690#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:54:30,114 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:54:30,114 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:54:30,114 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 18 [2022-12-14 08:54:30,114 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2088972429] [2022-12-14 08:54:30,114 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:54:30,115 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-12-14 08:54:30,115 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:30,115 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-12-14 08:54:30,116 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=403, Unknown=0, NotChecked=0, Total=552 [2022-12-14 08:54:30,116 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 18 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:30,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:30,323 INFO L93 Difference]: Finished difference Result 66 states and 67 transitions. [2022-12-14 08:54:30,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-12-14 08:54:30,323 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 18 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 54 [2022-12-14 08:54:30,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:30,324 INFO L225 Difference]: With dead ends: 66 [2022-12-14 08:54:30,324 INFO L226 Difference]: Without dead ends: 64 [2022-12-14 08:54:30,324 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 140 SyntacticMatches, 26 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 578 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=422, Invalid=1060, Unknown=0, NotChecked=0, Total=1482 [2022-12-14 08:54:30,325 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 60 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 132 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 135 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 132 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:30,325 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [60 Valid, 13 Invalid, 135 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 132 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:54:30,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2022-12-14 08:54:30,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 58. [2022-12-14 08:54:30,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 57 states have (on average 1.0350877192982457) internal successors, (59), 57 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:30,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 59 transitions. [2022-12-14 08:54:30,331 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 59 transitions. Word has length 54 [2022-12-14 08:54:30,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:30,332 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 59 transitions. [2022-12-14 08:54:30,332 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 18 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:30,332 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 59 transitions. [2022-12-14 08:54:30,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2022-12-14 08:54:30,332 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:30,332 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 13, 1, 1, 1, 1] [2022-12-14 08:54:30,336 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2022-12-14 08:54:30,533 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-12-14 08:54:30,534 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:30,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:30,535 INFO L85 PathProgramCache]: Analyzing trace with hash 920823946, now seen corresponding path program 25 times [2022-12-14 08:54:30,535 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:30,535 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1478644367] [2022-12-14 08:54:30,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:30,536 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:30,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:30,891 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 223 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:30,891 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:30,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1478644367] [2022-12-14 08:54:30,891 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1478644367] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:30,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [949106157] [2022-12-14 08:54:30,891 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:54:30,892 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:30,892 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:30,892 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:30,893 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-12-14 08:54:30,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:30,931 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 30 conjunts are in the unsatisfiable core [2022-12-14 08:54:30,932 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:54:31,270 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 260 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:31,271 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:54:31,513 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 260 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:31,513 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [949106157] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:54:31,513 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1697371844] [2022-12-14 08:54:31,514 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:54:31,514 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:54:31,514 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:54:31,514 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:54:31,514 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:54:31,561 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:54:31,768 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9316#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:54:31,768 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:54:31,768 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:54:31,768 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 45 [2022-12-14 08:54:31,768 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [742536872] [2022-12-14 08:54:31,768 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:54:31,769 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-12-14 08:54:31,769 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:31,769 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-12-14 08:54:31,771 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=499, Invalid=2051, Unknown=0, NotChecked=0, Total=2550 [2022-12-14 08:54:31,771 INFO L87 Difference]: Start difference. First operand 58 states and 59 transitions. Second operand has 46 states, 46 states have (on average 2.260869565217391) internal successors, (104), 45 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) [2022-12-14 08:54:32,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:32,024 INFO L93 Difference]: Finished difference Result 104 states and 106 transitions. [2022-12-14 08:54:32,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-12-14 08:54:32,025 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 2.260869565217391) internal successors, (104), 45 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 57 [2022-12-14 08:54:32,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:32,025 INFO L225 Difference]: With dead ends: 104 [2022-12-14 08:54:32,025 INFO L226 Difference]: Without dead ends: 59 [2022-12-14 08:54:32,027 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 122 SyntacticMatches, 27 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1551 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=830, Invalid=3330, Unknown=0, NotChecked=0, Total=4160 [2022-12-14 08:54:32,028 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 7 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 263 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 138 SdHoareTripleChecker+Invalid, 263 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 263 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:32,028 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 138 Invalid, 263 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 263 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:54:32,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2022-12-14 08:54:32,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2022-12-14 08:54:32,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 58 states have (on average 1.0344827586206897) internal successors, (60), 58 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:32,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2022-12-14 08:54:32,034 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 57 [2022-12-14 08:54:32,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:32,035 INFO L495 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2022-12-14 08:54:32,035 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 2.260869565217391) internal successors, (104), 45 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) [2022-12-14 08:54:32,035 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2022-12-14 08:54:32,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-12-14 08:54:32,035 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:32,035 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 13, 13, 1, 1, 1, 1] [2022-12-14 08:54:32,039 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2022-12-14 08:54:32,236 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-12-14 08:54:32,236 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:32,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:32,237 INFO L85 PathProgramCache]: Analyzing trace with hash -448068603, now seen corresponding path program 26 times [2022-12-14 08:54:32,237 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:32,238 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1749166069] [2022-12-14 08:54:32,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:32,238 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:32,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:32,460 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 91 proven. 274 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:32,460 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:32,460 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1749166069] [2022-12-14 08:54:32,460 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1749166069] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:32,460 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1201804348] [2022-12-14 08:54:32,460 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:54:32,460 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:32,461 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:32,461 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:32,462 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-12-14 08:54:32,527 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2022-12-14 08:54:32,527 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:54:32,529 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 34 conjunts are in the unsatisfiable core [2022-12-14 08:54:32,531 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:54:32,584 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 105 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:32,584 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:54:32,759 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 105 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:32,759 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1201804348] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:54:32,759 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [518538958] [2022-12-14 08:54:32,759 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:54:32,759 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:54:32,760 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:54:32,760 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:54:32,760 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:54:32,801 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:54:32,946 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9987#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:54:32,946 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:54:32,946 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:54:32,946 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 19 [2022-12-14 08:54:32,946 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1331476255] [2022-12-14 08:54:32,947 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:54:32,947 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-12-14 08:54:32,947 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:32,947 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-12-14 08:54:32,948 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=435, Unknown=0, NotChecked=0, Total=600 [2022-12-14 08:54:32,948 INFO L87 Difference]: Start difference. First operand 59 states and 60 transitions. Second operand has 20 states, 20 states have (on average 3.1) internal successors, (62), 19 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) [2022-12-14 08:54:33,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:33,097 INFO L93 Difference]: Finished difference Result 70 states and 71 transitions. [2022-12-14 08:54:33,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-12-14 08:54:33,098 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.1) internal successors, (62), 19 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) Word has length 58 [2022-12-14 08:54:33,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:33,098 INFO L225 Difference]: With dead ends: 70 [2022-12-14 08:54:33,098 INFO L226 Difference]: Without dead ends: 68 [2022-12-14 08:54:33,099 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 151 SyntacticMatches, 28 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 650 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=472, Invalid=1168, Unknown=0, NotChecked=0, Total=1640 [2022-12-14 08:54:33,099 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 38 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 145 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 148 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 145 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:33,099 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 14 Invalid, 148 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 145 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:54:33,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2022-12-14 08:54:33,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 62. [2022-12-14 08:54:33,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 61 states have (on average 1.0327868852459017) internal successors, (63), 61 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:33,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 63 transitions. [2022-12-14 08:54:33,105 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 63 transitions. Word has length 58 [2022-12-14 08:54:33,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:33,106 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 63 transitions. [2022-12-14 08:54:33,106 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 3.1) internal successors, (62), 19 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) [2022-12-14 08:54:33,106 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 63 transitions. [2022-12-14 08:54:33,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-12-14 08:54:33,106 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:33,106 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 14, 1, 1, 1, 1] [2022-12-14 08:54:33,110 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-12-14 08:54:33,307 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:33,307 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:33,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:33,308 INFO L85 PathProgramCache]: Analyzing trace with hash 351424276, now seen corresponding path program 27 times [2022-12-14 08:54:33,309 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:33,309 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1658665493] [2022-12-14 08:54:33,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:33,309 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:33,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:33,675 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 261 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:33,675 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:33,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1658665493] [2022-12-14 08:54:33,675 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1658665493] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:33,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [310838107] [2022-12-14 08:54:33,675 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:54:33,675 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:33,675 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:33,676 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:33,676 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-12-14 08:54:33,718 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:54:33,718 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:54:33,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 32 conjunts are in the unsatisfiable core [2022-12-14 08:54:33,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:54:34,091 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 301 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:34,091 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:54:34,391 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 301 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:34,391 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [310838107] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:54:34,391 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [974129514] [2022-12-14 08:54:34,392 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:54:34,392 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:54:34,392 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:54:34,393 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:54:34,393 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:54:34,445 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:54:34,694 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10656#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:54:34,694 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:54:34,694 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:54:34,694 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 48 [2022-12-14 08:54:34,695 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1124654602] [2022-12-14 08:54:34,695 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:54:34,695 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-12-14 08:54:34,695 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:34,696 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-12-14 08:54:34,697 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=563, Invalid=2299, Unknown=0, NotChecked=0, Total=2862 [2022-12-14 08:54:34,697 INFO L87 Difference]: Start difference. First operand 62 states and 63 transitions. Second operand has 49 states, 49 states have (on average 2.2653061224489797) internal successors, (111), 48 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) [2022-12-14 08:54:35,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:35,047 INFO L93 Difference]: Finished difference Result 111 states and 113 transitions. [2022-12-14 08:54:35,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-12-14 08:54:35,047 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.2653061224489797) internal successors, (111), 48 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) Word has length 61 [2022-12-14 08:54:35,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:35,048 INFO L225 Difference]: With dead ends: 111 [2022-12-14 08:54:35,048 INFO L226 Difference]: Without dead ends: 63 [2022-12-14 08:54:35,050 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 227 GetRequests, 131 SyntacticMatches, 29 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1753 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=940, Invalid=3752, Unknown=0, NotChecked=0, Total=4692 [2022-12-14 08:54:35,050 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 7 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 322 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 166 SdHoareTripleChecker+Invalid, 322 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 322 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:35,050 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 166 Invalid, 322 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 322 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:54:35,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-12-14 08:54:35,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2022-12-14 08:54:35,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 62 states have (on average 1.032258064516129) internal successors, (64), 62 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:35,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2022-12-14 08:54:35,060 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 61 [2022-12-14 08:54:35,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:35,061 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2022-12-14 08:54:35,061 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 2.2653061224489797) internal successors, (111), 48 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) [2022-12-14 08:54:35,061 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2022-12-14 08:54:35,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2022-12-14 08:54:35,061 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:35,061 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 14, 14, 1, 1, 1, 1] [2022-12-14 08:54:35,065 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2022-12-14 08:54:35,262 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-12-14 08:54:35,262 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:35,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:35,263 INFO L85 PathProgramCache]: Analyzing trace with hash 1484420367, now seen corresponding path program 28 times [2022-12-14 08:54:35,264 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:35,264 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1503045803] [2022-12-14 08:54:35,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:35,264 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:35,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:35,505 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 105 proven. 316 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:35,505 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:35,505 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1503045803] [2022-12-14 08:54:35,505 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1503045803] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:35,505 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1111407955] [2022-12-14 08:54:35,505 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:54:35,505 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:35,505 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:35,506 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:35,506 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-12-14 08:54:35,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:35,566 INFO L263 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 36 conjunts are in the unsatisfiable core [2022-12-14 08:54:35,567 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:54:35,624 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 120 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:35,624 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:54:35,832 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 120 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:35,833 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1111407955] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:54:35,833 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1337911608] [2022-12-14 08:54:35,833 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:54:35,833 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:54:35,834 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:54:35,834 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:54:35,834 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:54:35,883 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:54:36,048 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11373#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:54:36,048 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:54:36,048 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:54:36,049 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 20 [2022-12-14 08:54:36,049 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1801621785] [2022-12-14 08:54:36,049 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:54:36,049 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-12-14 08:54:36,049 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:36,049 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-12-14 08:54:36,050 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=468, Unknown=0, NotChecked=0, Total=650 [2022-12-14 08:54:36,050 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand has 21 states, 21 states have (on average 3.142857142857143) internal successors, (66), 20 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:36,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:36,209 INFO L93 Difference]: Finished difference Result 74 states and 75 transitions. [2022-12-14 08:54:36,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-12-14 08:54:36,210 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 3.142857142857143) internal successors, (66), 20 states have internal predecessors, (66), 0 states have call successors, (0), 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 62 [2022-12-14 08:54:36,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:36,210 INFO L225 Difference]: With dead ends: 74 [2022-12-14 08:54:36,210 INFO L226 Difference]: Without dead ends: 72 [2022-12-14 08:54:36,210 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 162 SyntacticMatches, 30 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 726 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=525, Invalid=1281, Unknown=0, NotChecked=0, Total=1806 [2022-12-14 08:54:36,211 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 38 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 166 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 169 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 166 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:36,211 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 16 Invalid, 169 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 166 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:54:36,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2022-12-14 08:54:36,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 66. [2022-12-14 08:54:36,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 65 states have (on average 1.0307692307692307) internal successors, (67), 65 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:36,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2022-12-14 08:54:36,218 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 62 [2022-12-14 08:54:36,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:36,218 INFO L495 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2022-12-14 08:54:36,218 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 3.142857142857143) internal successors, (66), 20 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:36,218 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2022-12-14 08:54:36,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-12-14 08:54:36,218 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:36,219 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 15, 1, 1, 1, 1] [2022-12-14 08:54:36,223 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Ended with exit code 0 [2022-12-14 08:54:36,419 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:36,420 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:36,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:36,421 INFO L85 PathProgramCache]: Analyzing trace with hash 1388693962, now seen corresponding path program 29 times [2022-12-14 08:54:36,421 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:36,422 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [824838820] [2022-12-14 08:54:36,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:36,422 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:36,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:36,760 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 302 proven. 163 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:36,760 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:36,760 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [824838820] [2022-12-14 08:54:36,760 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [824838820] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:36,761 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1335922568] [2022-12-14 08:54:36,761 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:54:36,761 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:36,761 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:36,761 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:36,762 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-12-14 08:54:36,819 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2022-12-14 08:54:36,819 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:54:36,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 34 conjunts are in the unsatisfiable core [2022-12-14 08:54:36,821 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:54:37,227 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 345 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:37,227 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:54:37,552 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 345 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:37,553 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1335922568] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:54:37,553 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [749094458] [2022-12-14 08:54:37,554 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:54:37,554 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:54:37,554 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:54:37,554 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:54:37,554 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:54:37,598 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:54:37,812 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12085#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:54:37,812 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:54:37,812 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:54:37,812 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 51 [2022-12-14 08:54:37,812 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1980976292] [2022-12-14 08:54:37,812 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:54:37,812 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-12-14 08:54:37,812 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:37,813 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-12-14 08:54:37,813 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=631, Invalid=2561, Unknown=0, NotChecked=0, Total=3192 [2022-12-14 08:54:37,813 INFO L87 Difference]: Start difference. First operand 66 states and 67 transitions. Second operand has 52 states, 52 states have (on average 2.269230769230769) internal successors, (118), 51 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) [2022-12-14 08:54:38,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:38,112 INFO L93 Difference]: Finished difference Result 118 states and 120 transitions. [2022-12-14 08:54:38,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-12-14 08:54:38,112 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.269230769230769) internal successors, (118), 51 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 65 [2022-12-14 08:54:38,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:38,113 INFO L225 Difference]: With dead ends: 118 [2022-12-14 08:54:38,113 INFO L226 Difference]: Without dead ends: 67 [2022-12-14 08:54:38,113 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 140 SyntacticMatches, 31 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1967 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1057, Invalid=4199, Unknown=0, NotChecked=0, Total=5256 [2022-12-14 08:54:38,114 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 7 mSDsluCounter, 149 mSDsCounter, 0 mSdLazyCounter, 334 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 166 SdHoareTripleChecker+Invalid, 334 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 334 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:38,114 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 166 Invalid, 334 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 334 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:54:38,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2022-12-14 08:54:38,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2022-12-14 08:54:38,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.0303030303030303) internal successors, (68), 66 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:38,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 68 transitions. [2022-12-14 08:54:38,121 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 68 transitions. Word has length 65 [2022-12-14 08:54:38,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:38,121 INFO L495 AbstractCegarLoop]: Abstraction has 67 states and 68 transitions. [2022-12-14 08:54:38,121 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 2.269230769230769) internal successors, (118), 51 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) [2022-12-14 08:54:38,121 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 68 transitions. [2022-12-14 08:54:38,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-12-14 08:54:38,121 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:38,122 INFO L195 NwaCegarLoop]: trace histogram [16, 16, 15, 15, 1, 1, 1, 1] [2022-12-14 08:54:38,126 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2022-12-14 08:54:38,322 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:38,323 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:38,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:38,324 INFO L85 PathProgramCache]: Analyzing trace with hash -1450935739, now seen corresponding path program 30 times [2022-12-14 08:54:38,324 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:38,324 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [985996871] [2022-12-14 08:54:38,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:38,325 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:38,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:38,577 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 120 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:38,577 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:38,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [985996871] [2022-12-14 08:54:38,577 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [985996871] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:38,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [452767174] [2022-12-14 08:54:38,577 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:54:38,577 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:38,577 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:38,578 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:38,579 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-12-14 08:54:38,623 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:54:38,624 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:54:38,625 INFO L263 TraceCheckSpWp]: Trace formula consists of 268 conjuncts, 38 conjunts are in the unsatisfiable core [2022-12-14 08:54:38,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:54:38,678 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 136 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:38,678 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:54:38,862 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 136 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:38,862 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [452767174] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:54:38,862 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1292257844] [2022-12-14 08:54:38,863 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:54:38,863 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:54:38,863 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:54:38,863 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:54:38,863 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:54:38,908 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:54:39,035 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12848#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:54:39,035 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:54:39,035 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:54:39,035 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 21 [2022-12-14 08:54:39,035 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [51456530] [2022-12-14 08:54:39,035 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:54:39,035 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-12-14 08:54:39,036 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:39,036 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-12-14 08:54:39,036 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=502, Unknown=0, NotChecked=0, Total=702 [2022-12-14 08:54:39,036 INFO L87 Difference]: Start difference. First operand 67 states and 68 transitions. Second operand has 22 states, 22 states have (on average 3.1818181818181817) internal successors, (70), 21 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:39,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:39,251 INFO L93 Difference]: Finished difference Result 78 states and 79 transitions. [2022-12-14 08:54:39,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-12-14 08:54:39,252 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 3.1818181818181817) internal successors, (70), 21 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 66 [2022-12-14 08:54:39,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:39,252 INFO L225 Difference]: With dead ends: 78 [2022-12-14 08:54:39,252 INFO L226 Difference]: Without dead ends: 76 [2022-12-14 08:54:39,252 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 173 SyntacticMatches, 32 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 806 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=581, Invalid=1399, Unknown=0, NotChecked=0, Total=1980 [2022-12-14 08:54:39,253 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 72 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 153 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 156 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 153 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:39,253 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [72 Valid, 15 Invalid, 156 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 153 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:54:39,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2022-12-14 08:54:39,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 70. [2022-12-14 08:54:39,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.0289855072463767) internal successors, (71), 69 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:39,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 71 transitions. [2022-12-14 08:54:39,261 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 71 transitions. Word has length 66 [2022-12-14 08:54:39,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:39,261 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 71 transitions. [2022-12-14 08:54:39,261 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 3.1818181818181817) internal successors, (70), 21 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:39,261 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 71 transitions. [2022-12-14 08:54:39,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2022-12-14 08:54:39,261 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:39,261 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 16, 1, 1, 1, 1] [2022-12-14 08:54:39,267 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2022-12-14 08:54:39,462 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2022-12-14 08:54:39,463 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:39,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:39,464 INFO L85 PathProgramCache]: Analyzing trace with hash -270913324, now seen corresponding path program 31 times [2022-12-14 08:54:39,464 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:39,465 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2090618629] [2022-12-14 08:54:39,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:39,466 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:39,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:39,893 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 346 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:39,893 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:39,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2090618629] [2022-12-14 08:54:39,893 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2090618629] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:39,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [748855865] [2022-12-14 08:54:39,893 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:54:39,893 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:39,894 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:39,894 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:39,895 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-12-14 08:54:39,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:39,938 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 36 conjunts are in the unsatisfiable core [2022-12-14 08:54:39,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:54:40,363 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 392 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:40,363 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:54:40,635 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 392 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:40,635 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [748855865] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:54:40,635 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1873519772] [2022-12-14 08:54:40,636 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:54:40,636 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:54:40,636 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:54:40,636 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:54:40,636 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:54:40,687 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:54:40,915 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13603#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:54:40,915 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:54:40,915 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:54:40,916 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 54 [2022-12-14 08:54:40,916 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1440667209] [2022-12-14 08:54:40,916 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:54:40,916 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2022-12-14 08:54:40,916 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:40,916 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2022-12-14 08:54:40,917 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=703, Invalid=2837, Unknown=0, NotChecked=0, Total=3540 [2022-12-14 08:54:40,917 INFO L87 Difference]: Start difference. First operand 70 states and 71 transitions. Second operand has 55 states, 55 states have (on average 2.272727272727273) internal successors, (125), 54 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:41,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:41,186 INFO L93 Difference]: Finished difference Result 125 states and 127 transitions. [2022-12-14 08:54:41,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-12-14 08:54:41,186 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 2.272727272727273) internal successors, (125), 54 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2022-12-14 08:54:41,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:41,186 INFO L225 Difference]: With dead ends: 125 [2022-12-14 08:54:41,186 INFO L226 Difference]: Without dead ends: 71 [2022-12-14 08:54:41,187 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 149 SyntacticMatches, 33 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2193 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1181, Invalid=4671, Unknown=0, NotChecked=0, Total=5852 [2022-12-14 08:54:41,187 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 7 mSDsluCounter, 182 mSDsCounter, 0 mSdLazyCounter, 390 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 200 SdHoareTripleChecker+Invalid, 390 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 390 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:41,188 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 200 Invalid, 390 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 390 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:54:41,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-12-14 08:54:41,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2022-12-14 08:54:41,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 70 states have (on average 1.0285714285714285) internal successors, (72), 70 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:41,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 72 transitions. [2022-12-14 08:54:41,195 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 72 transitions. Word has length 69 [2022-12-14 08:54:41,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:41,195 INFO L495 AbstractCegarLoop]: Abstraction has 71 states and 72 transitions. [2022-12-14 08:54:41,195 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 2.272727272727273) internal successors, (125), 54 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:41,195 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 72 transitions. [2022-12-14 08:54:41,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-12-14 08:54:41,195 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:41,195 INFO L195 NwaCegarLoop]: trace histogram [17, 17, 16, 16, 1, 1, 1, 1] [2022-12-14 08:54:41,199 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2022-12-14 08:54:41,396 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:41,396 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:41,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:41,397 INFO L85 PathProgramCache]: Analyzing trace with hash 1854286799, now seen corresponding path program 32 times [2022-12-14 08:54:41,398 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:41,398 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1549929320] [2022-12-14 08:54:41,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:41,398 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:41,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:41,653 INFO L134 CoverageAnalysis]: Checked inductivity of 545 backedges. 136 proven. 409 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:41,654 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:41,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1549929320] [2022-12-14 08:54:41,654 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1549929320] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:41,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [818516974] [2022-12-14 08:54:41,654 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:54:41,654 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:41,654 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:41,655 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:41,656 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-12-14 08:54:41,718 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2022-12-14 08:54:41,718 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:54:41,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 40 conjunts are in the unsatisfiable core [2022-12-14 08:54:41,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:54:41,792 INFO L134 CoverageAnalysis]: Checked inductivity of 545 backedges. 153 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:41,792 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:54:42,011 INFO L134 CoverageAnalysis]: Checked inductivity of 545 backedges. 153 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:42,011 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [818516974] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:54:42,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2109041067] [2022-12-14 08:54:42,012 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:54:42,012 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:54:42,013 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:54:42,013 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:54:42,013 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:54:42,054 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:54:42,184 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14412#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:54:42,184 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:54:42,184 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:54:42,184 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 22 [2022-12-14 08:54:42,184 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [214616325] [2022-12-14 08:54:42,184 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:54:42,184 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-12-14 08:54:42,185 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:42,185 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-12-14 08:54:42,185 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=219, Invalid=537, Unknown=0, NotChecked=0, Total=756 [2022-12-14 08:54:42,185 INFO L87 Difference]: Start difference. First operand 71 states and 72 transitions. Second operand has 23 states, 23 states have (on average 3.217391304347826) internal successors, (74), 22 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:42,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:42,394 INFO L93 Difference]: Finished difference Result 82 states and 83 transitions. [2022-12-14 08:54:42,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-12-14 08:54:42,394 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 3.217391304347826) internal successors, (74), 22 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) Word has length 70 [2022-12-14 08:54:42,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:42,395 INFO L225 Difference]: With dead ends: 82 [2022-12-14 08:54:42,395 INFO L226 Difference]: Without dead ends: 80 [2022-12-14 08:54:42,395 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 184 SyntacticMatches, 34 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 890 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=640, Invalid=1522, Unknown=0, NotChecked=0, Total=2162 [2022-12-14 08:54:42,396 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 42 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 184 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 187 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 184 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:42,396 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 18 Invalid, 187 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 184 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:54:42,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2022-12-14 08:54:42,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 74. [2022-12-14 08:54:42,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 73 states have (on average 1.0273972602739727) internal successors, (75), 73 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:42,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 75 transitions. [2022-12-14 08:54:42,405 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 75 transitions. Word has length 70 [2022-12-14 08:54:42,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:42,405 INFO L495 AbstractCegarLoop]: Abstraction has 74 states and 75 transitions. [2022-12-14 08:54:42,405 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 3.217391304347826) internal successors, (74), 22 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:42,405 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 75 transitions. [2022-12-14 08:54:42,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-12-14 08:54:42,406 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:42,406 INFO L195 NwaCegarLoop]: trace histogram [18, 17, 17, 17, 1, 1, 1, 1] [2022-12-14 08:54:42,410 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Ended with exit code 0 [2022-12-14 08:54:42,606 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2022-12-14 08:54:42,607 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:42,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:42,608 INFO L85 PathProgramCache]: Analyzing trace with hash -806511862, now seen corresponding path program 33 times [2022-12-14 08:54:42,608 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:42,608 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [78487129] [2022-12-14 08:54:42,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:42,609 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:42,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:43,068 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 393 proven. 202 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:43,068 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:43,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [78487129] [2022-12-14 08:54:43,068 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [78487129] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:43,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [526826022] [2022-12-14 08:54:43,068 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:54:43,068 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:43,068 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:43,069 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:43,070 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-12-14 08:54:43,122 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:54:43,122 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:54:43,124 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 38 conjunts are in the unsatisfiable core [2022-12-14 08:54:43,125 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:54:43,542 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 442 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:43,542 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:54:43,845 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 442 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:43,845 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [526826022] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:54:43,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [725865767] [2022-12-14 08:54:43,846 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:54:43,846 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:54:43,846 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:54:43,846 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:54:43,846 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:54:43,889 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:54:44,168 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15210#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:54:44,168 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:54:44,169 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:54:44,169 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 57 [2022-12-14 08:54:44,169 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1829330077] [2022-12-14 08:54:44,169 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:54:44,169 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2022-12-14 08:54:44,169 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:44,170 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2022-12-14 08:54:44,170 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=779, Invalid=3127, Unknown=0, NotChecked=0, Total=3906 [2022-12-14 08:54:44,171 INFO L87 Difference]: Start difference. First operand 74 states and 75 transitions. Second operand has 58 states, 58 states have (on average 2.2758620689655173) internal successors, (132), 57 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:44,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:44,486 INFO L93 Difference]: Finished difference Result 132 states and 134 transitions. [2022-12-14 08:54:44,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-12-14 08:54:44,486 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 2.2758620689655173) internal successors, (132), 57 states have internal predecessors, (132), 0 states have call successors, (0), 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 73 [2022-12-14 08:54:44,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:44,486 INFO L225 Difference]: With dead ends: 132 [2022-12-14 08:54:44,487 INFO L226 Difference]: Without dead ends: 75 [2022-12-14 08:54:44,487 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 158 SyntacticMatches, 35 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2431 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1312, Invalid=5168, Unknown=0, NotChecked=0, Total=6480 [2022-12-14 08:54:44,487 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 7 mSDsluCounter, 172 mSDsCounter, 0 mSdLazyCounter, 388 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 191 SdHoareTripleChecker+Invalid, 388 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 388 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:44,488 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 191 Invalid, 388 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 388 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:54:44,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2022-12-14 08:54:44,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2022-12-14 08:54:44,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.027027027027027) internal successors, (76), 74 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:44,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2022-12-14 08:54:44,496 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 73 [2022-12-14 08:54:44,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:44,496 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2022-12-14 08:54:44,496 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 2.2758620689655173) internal successors, (132), 57 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:44,496 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2022-12-14 08:54:44,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2022-12-14 08:54:44,497 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:44,497 INFO L195 NwaCegarLoop]: trace histogram [18, 18, 17, 17, 1, 1, 1, 1] [2022-12-14 08:54:44,501 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Ended with exit code 0 [2022-12-14 08:54:44,697 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:44,698 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:44,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:44,699 INFO L85 PathProgramCache]: Analyzing trace with hash -774004603, now seen corresponding path program 34 times [2022-12-14 08:54:44,699 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:44,700 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [855688668] [2022-12-14 08:54:44,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:44,701 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:44,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:44,985 INFO L134 CoverageAnalysis]: Checked inductivity of 613 backedges. 153 proven. 460 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:44,985 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:44,985 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [855688668] [2022-12-14 08:54:44,985 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [855688668] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:44,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [456702695] [2022-12-14 08:54:44,986 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:54:44,986 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:44,986 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:44,987 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:44,987 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-12-14 08:54:45,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:45,051 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 42 conjunts are in the unsatisfiable core [2022-12-14 08:54:45,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:54:45,122 INFO L134 CoverageAnalysis]: Checked inductivity of 613 backedges. 171 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:45,123 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:54:45,342 INFO L134 CoverageAnalysis]: Checked inductivity of 613 backedges. 171 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:45,342 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [456702695] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:54:45,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [67387408] [2022-12-14 08:54:45,343 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:54:45,343 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:54:45,343 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:54:45,343 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:54:45,343 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:54:45,393 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:54:45,579 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16065#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:54:45,579 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:54:45,579 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:54:45,579 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 23 [2022-12-14 08:54:45,579 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [519514870] [2022-12-14 08:54:45,579 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:54:45,580 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-12-14 08:54:45,580 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:45,580 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-12-14 08:54:45,580 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=239, Invalid=573, Unknown=0, NotChecked=0, Total=812 [2022-12-14 08:54:45,580 INFO L87 Difference]: Start difference. First operand 75 states and 76 transitions. Second operand has 24 states, 24 states have (on average 3.25) internal successors, (78), 23 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:45,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:45,812 INFO L93 Difference]: Finished difference Result 86 states and 87 transitions. [2022-12-14 08:54:45,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-12-14 08:54:45,813 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 3.25) internal successors, (78), 23 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 74 [2022-12-14 08:54:45,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:45,813 INFO L225 Difference]: With dead ends: 86 [2022-12-14 08:54:45,813 INFO L226 Difference]: Without dead ends: 84 [2022-12-14 08:54:45,814 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 278 GetRequests, 195 SyntacticMatches, 36 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 978 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=702, Invalid=1650, Unknown=0, NotChecked=0, Total=2352 [2022-12-14 08:54:45,814 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 44 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 203 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:45,814 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 18 Invalid, 203 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 200 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:54:45,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2022-12-14 08:54:45,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 78. [2022-12-14 08:54:45,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 77 states have (on average 1.025974025974026) internal successors, (79), 77 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:45,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 79 transitions. [2022-12-14 08:54:45,825 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 79 transitions. Word has length 74 [2022-12-14 08:54:45,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:45,825 INFO L495 AbstractCegarLoop]: Abstraction has 78 states and 79 transitions. [2022-12-14 08:54:45,825 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 3.25) internal successors, (78), 23 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:45,825 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 79 transitions. [2022-12-14 08:54:45,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2022-12-14 08:54:45,825 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:45,826 INFO L195 NwaCegarLoop]: trace histogram [19, 18, 18, 18, 1, 1, 1, 1] [2022-12-14 08:54:45,829 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Ended with exit code 0 [2022-12-14 08:54:46,026 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:46,027 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:46,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:46,028 INFO L85 PathProgramCache]: Analyzing trace with hash 1313104532, now seen corresponding path program 35 times [2022-12-14 08:54:46,028 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:46,028 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1522113331] [2022-12-14 08:54:46,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:46,029 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:46,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:46,533 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 443 proven. 223 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:46,533 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:46,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1522113331] [2022-12-14 08:54:46,533 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1522113331] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:46,534 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1600919437] [2022-12-14 08:54:46,534 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:54:46,534 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:46,534 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:46,535 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:46,535 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-12-14 08:54:46,611 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2022-12-14 08:54:46,611 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:54:46,613 INFO L263 TraceCheckSpWp]: Trace formula consists of 308 conjuncts, 40 conjunts are in the unsatisfiable core [2022-12-14 08:54:46,615 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:54:47,158 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 495 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:47,158 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:54:47,561 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 495 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:47,561 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1600919437] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:54:47,561 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1698394529] [2022-12-14 08:54:47,562 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:54:47,562 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:54:47,562 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:54:47,562 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:54:47,562 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:54:47,607 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:54:47,896 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16906#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:54:47,896 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:54:47,896 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:54:47,896 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 60 [2022-12-14 08:54:47,897 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [20174137] [2022-12-14 08:54:47,897 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:54:47,897 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2022-12-14 08:54:47,897 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:47,898 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2022-12-14 08:54:47,898 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=859, Invalid=3431, Unknown=0, NotChecked=0, Total=4290 [2022-12-14 08:54:47,898 INFO L87 Difference]: Start difference. First operand 78 states and 79 transitions. Second operand has 61 states, 61 states have (on average 2.278688524590164) internal successors, (139), 60 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:48,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:48,338 INFO L93 Difference]: Finished difference Result 139 states and 141 transitions. [2022-12-14 08:54:48,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-12-14 08:54:48,339 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 2.278688524590164) internal successors, (139), 60 states have internal predecessors, (139), 0 states have call successors, (0), 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 77 [2022-12-14 08:54:48,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:48,339 INFO L225 Difference]: With dead ends: 139 [2022-12-14 08:54:48,339 INFO L226 Difference]: Without dead ends: 79 [2022-12-14 08:54:48,340 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 167 SyntacticMatches, 37 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2681 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1450, Invalid=5690, Unknown=0, NotChecked=0, Total=7140 [2022-12-14 08:54:48,340 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 7 mSDsluCounter, 165 mSDsCounter, 0 mSdLazyCounter, 367 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 185 SdHoareTripleChecker+Invalid, 367 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 367 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:48,341 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 185 Invalid, 367 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 367 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:54:48,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2022-12-14 08:54:48,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2022-12-14 08:54:48,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 78 states have (on average 1.0256410256410255) internal successors, (80), 78 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:48,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2022-12-14 08:54:48,350 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 77 [2022-12-14 08:54:48,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:48,350 INFO L495 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2022-12-14 08:54:48,350 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 2.278688524590164) internal successors, (139), 60 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:48,350 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2022-12-14 08:54:48,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2022-12-14 08:54:48,350 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:48,350 INFO L195 NwaCegarLoop]: trace histogram [19, 19, 18, 18, 1, 1, 1, 1] [2022-12-14 08:54:48,355 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Ended with exit code 0 [2022-12-14 08:54:48,551 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2022-12-14 08:54:48,552 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:48,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:48,553 INFO L85 PathProgramCache]: Analyzing trace with hash 628044431, now seen corresponding path program 36 times [2022-12-14 08:54:48,553 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:48,554 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [353597242] [2022-12-14 08:54:48,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:48,554 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:48,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:48,907 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 171 proven. 514 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:48,907 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:48,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [353597242] [2022-12-14 08:54:48,907 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [353597242] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:48,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1611578411] [2022-12-14 08:54:48,907 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:54:48,908 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:48,908 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:48,908 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:48,909 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-12-14 08:54:48,967 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:54:48,967 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:54:48,969 INFO L263 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 44 conjunts are in the unsatisfiable core [2022-12-14 08:54:48,970 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:54:49,026 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 190 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:49,026 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:54:49,293 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 190 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:49,293 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1611578411] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:54:49,293 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1805948112] [2022-12-14 08:54:49,294 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:54:49,294 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:54:49,294 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:54:49,294 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:54:49,294 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:54:49,345 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:54:49,530 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17807#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:54:49,530 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:54:49,530 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:54:49,530 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 24 [2022-12-14 08:54:49,530 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1112171906] [2022-12-14 08:54:49,530 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:54:49,531 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-12-14 08:54:49,531 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:49,531 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-12-14 08:54:49,531 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=260, Invalid=610, Unknown=0, NotChecked=0, Total=870 [2022-12-14 08:54:49,531 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand has 25 states, 25 states have (on average 3.28) internal successors, (82), 24 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) [2022-12-14 08:54:49,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:49,823 INFO L93 Difference]: Finished difference Result 90 states and 91 transitions. [2022-12-14 08:54:49,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-12-14 08:54:49,823 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 3.28) internal successors, (82), 24 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 78 [2022-12-14 08:54:49,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:49,824 INFO L225 Difference]: With dead ends: 90 [2022-12-14 08:54:49,824 INFO L226 Difference]: Without dead ends: 88 [2022-12-14 08:54:49,824 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 293 GetRequests, 206 SyntacticMatches, 38 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1070 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=767, Invalid=1783, Unknown=0, NotChecked=0, Total=2550 [2022-12-14 08:54:49,824 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 86 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 184 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 187 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 184 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:49,824 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [86 Valid, 13 Invalid, 187 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 184 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:54:49,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-12-14 08:54:49,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 82. [2022-12-14 08:54:49,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 81 states have (on average 1.0246913580246915) internal successors, (83), 81 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:49,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 83 transitions. [2022-12-14 08:54:49,834 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 83 transitions. Word has length 78 [2022-12-14 08:54:49,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:49,834 INFO L495 AbstractCegarLoop]: Abstraction has 82 states and 83 transitions. [2022-12-14 08:54:49,834 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 3.28) internal successors, (82), 24 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) [2022-12-14 08:54:49,834 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 83 transitions. [2022-12-14 08:54:49,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2022-12-14 08:54:49,835 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:49,835 INFO L195 NwaCegarLoop]: trace histogram [20, 19, 19, 19, 1, 1, 1, 1] [2022-12-14 08:54:49,839 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2022-12-14 08:54:50,035 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2022-12-14 08:54:50,036 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:50,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:50,037 INFO L85 PathProgramCache]: Analyzing trace with hash 1198922826, now seen corresponding path program 37 times [2022-12-14 08:54:50,037 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:50,038 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1634976600] [2022-12-14 08:54:50,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:50,038 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:50,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:50,612 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 496 proven. 245 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:50,612 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:50,612 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1634976600] [2022-12-14 08:54:50,612 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1634976600] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:50,612 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [631634608] [2022-12-14 08:54:50,612 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:54:50,612 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:50,612 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:50,613 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:50,614 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-12-14 08:54:50,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:50,662 INFO L263 TraceCheckSpWp]: Trace formula consists of 323 conjuncts, 42 conjunts are in the unsatisfiable core [2022-12-14 08:54:50,663 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:54:51,294 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 551 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:51,294 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:54:51,759 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 551 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:51,760 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [631634608] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:54:51,760 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [461332821] [2022-12-14 08:54:51,761 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:54:51,761 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:54:51,761 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:54:51,761 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:54:51,761 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:54:51,812 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:54:52,166 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18691#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:54:52,166 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:54:52,166 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:54:52,167 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 63 [2022-12-14 08:54:52,167 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [911334972] [2022-12-14 08:54:52,167 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:54:52,167 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2022-12-14 08:54:52,167 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:52,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2022-12-14 08:54:52,168 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=943, Invalid=3749, Unknown=0, NotChecked=0, Total=4692 [2022-12-14 08:54:52,168 INFO L87 Difference]: Start difference. First operand 82 states and 83 transitions. Second operand has 64 states, 64 states have (on average 2.28125) internal successors, (146), 63 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) [2022-12-14 08:54:52,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:52,659 INFO L93 Difference]: Finished difference Result 146 states and 148 transitions. [2022-12-14 08:54:52,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-12-14 08:54:52,659 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 2.28125) internal successors, (146), 63 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) Word has length 81 [2022-12-14 08:54:52,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:52,660 INFO L225 Difference]: With dead ends: 146 [2022-12-14 08:54:52,660 INFO L226 Difference]: Without dead ends: 83 [2022-12-14 08:54:52,660 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 176 SyntacticMatches, 39 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2943 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1595, Invalid=6237, Unknown=0, NotChecked=0, Total=7832 [2022-12-14 08:54:52,661 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 7 mSDsluCounter, 194 mSDsCounter, 0 mSdLazyCounter, 422 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 215 SdHoareTripleChecker+Invalid, 422 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 422 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:52,661 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 215 Invalid, 422 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 422 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:54:52,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2022-12-14 08:54:52,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2022-12-14 08:54:52,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 82 states have (on average 1.024390243902439) internal successors, (84), 82 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:52,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 84 transitions. [2022-12-14 08:54:52,673 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 84 transitions. Word has length 81 [2022-12-14 08:54:52,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:52,673 INFO L495 AbstractCegarLoop]: Abstraction has 83 states and 84 transitions. [2022-12-14 08:54:52,674 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 2.28125) internal successors, (146), 63 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) [2022-12-14 08:54:52,674 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 84 transitions. [2022-12-14 08:54:52,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-12-14 08:54:52,674 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:52,674 INFO L195 NwaCegarLoop]: trace histogram [20, 20, 19, 19, 1, 1, 1, 1] [2022-12-14 08:54:52,678 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2022-12-14 08:54:52,875 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:52,875 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:52,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:52,876 INFO L85 PathProgramCache]: Analyzing trace with hash -328042811, now seen corresponding path program 38 times [2022-12-14 08:54:52,877 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:52,877 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [497679051] [2022-12-14 08:54:52,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:52,878 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:52,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:53,218 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 190 proven. 571 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:53,218 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:53,218 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [497679051] [2022-12-14 08:54:53,218 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [497679051] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:53,219 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1982433831] [2022-12-14 08:54:53,219 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:54:53,219 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:53,219 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:53,220 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:53,220 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-12-14 08:54:53,289 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2022-12-14 08:54:53,289 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:54:53,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 328 conjuncts, 46 conjunts are in the unsatisfiable core [2022-12-14 08:54:53,292 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:54:53,361 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 210 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:53,362 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:54:53,736 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 210 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:53,736 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1982433831] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:54:53,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [281982311] [2022-12-14 08:54:53,737 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:54:53,737 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:54:53,737 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:54:53,737 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:54:53,737 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:54:53,785 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:54:53,956 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19638#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:54:53,956 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:54:53,956 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:54:53,956 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 25 [2022-12-14 08:54:53,956 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1465310649] [2022-12-14 08:54:53,957 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:54:53,957 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-12-14 08:54:53,957 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:53,957 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-12-14 08:54:53,958 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=648, Unknown=0, NotChecked=0, Total=930 [2022-12-14 08:54:53,958 INFO L87 Difference]: Start difference. First operand 83 states and 84 transitions. Second operand has 26 states, 26 states have (on average 3.3076923076923075) internal successors, (86), 25 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) [2022-12-14 08:54:54,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:54,251 INFO L93 Difference]: Finished difference Result 94 states and 95 transitions. [2022-12-14 08:54:54,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-12-14 08:54:54,251 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 3.3076923076923075) internal successors, (86), 25 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) Word has length 82 [2022-12-14 08:54:54,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:54,252 INFO L225 Difference]: With dead ends: 94 [2022-12-14 08:54:54,252 INFO L226 Difference]: Without dead ends: 92 [2022-12-14 08:54:54,252 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 308 GetRequests, 217 SyntacticMatches, 40 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1166 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=835, Invalid=1921, Unknown=0, NotChecked=0, Total=2756 [2022-12-14 08:54:54,253 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 48 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 220 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 223 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 220 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:54,253 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [48 Valid, 20 Invalid, 223 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 220 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:54:54,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2022-12-14 08:54:54,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 86. [2022-12-14 08:54:54,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 85 states have (on average 1.0235294117647058) internal successors, (87), 85 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) [2022-12-14 08:54:54,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 87 transitions. [2022-12-14 08:54:54,264 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 87 transitions. Word has length 82 [2022-12-14 08:54:54,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:54,264 INFO L495 AbstractCegarLoop]: Abstraction has 86 states and 87 transitions. [2022-12-14 08:54:54,264 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 3.3076923076923075) internal successors, (86), 25 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) [2022-12-14 08:54:54,264 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 87 transitions. [2022-12-14 08:54:54,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-12-14 08:54:54,265 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:54,265 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 20, 1, 1, 1, 1] [2022-12-14 08:54:54,269 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2022-12-14 08:54:54,465 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-12-14 08:54:54,466 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:54,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:54,467 INFO L85 PathProgramCache]: Analyzing trace with hash -1667963820, now seen corresponding path program 39 times [2022-12-14 08:54:54,468 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:54,468 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2093790365] [2022-12-14 08:54:54,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:54,469 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:54,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:55,129 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 552 proven. 268 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:55,130 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:55,130 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2093790365] [2022-12-14 08:54:55,130 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2093790365] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:55,130 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1239264719] [2022-12-14 08:54:55,130 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:54:55,130 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:55,130 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:55,131 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:55,132 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2022-12-14 08:54:55,185 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:54:55,185 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:54:55,187 INFO L263 TraceCheckSpWp]: Trace formula consists of 338 conjuncts, 44 conjunts are in the unsatisfiable core [2022-12-14 08:54:55,188 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:54:55,737 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 610 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:55,737 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:54:56,146 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 610 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:56,146 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1239264719] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:54:56,146 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1820931725] [2022-12-14 08:54:56,147 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:54:56,147 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:54:56,147 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:54:56,147 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:54:56,147 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:54:56,191 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:54:56,469 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20565#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:54:56,469 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:54:56,469 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:54:56,469 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 66 [2022-12-14 08:54:56,469 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1930102686] [2022-12-14 08:54:56,469 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:54:56,470 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2022-12-14 08:54:56,470 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:56,470 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2022-12-14 08:54:56,471 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1031, Invalid=4081, Unknown=0, NotChecked=0, Total=5112 [2022-12-14 08:54:56,471 INFO L87 Difference]: Start difference. First operand 86 states and 87 transitions. Second operand has 67 states, 67 states have (on average 2.283582089552239) internal successors, (153), 66 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:56,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:56,952 INFO L93 Difference]: Finished difference Result 153 states and 155 transitions. [2022-12-14 08:54:56,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-12-14 08:54:56,952 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 2.283582089552239) internal successors, (153), 66 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 85 [2022-12-14 08:54:56,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:56,953 INFO L225 Difference]: With dead ends: 153 [2022-12-14 08:54:56,953 INFO L226 Difference]: Without dead ends: 87 [2022-12-14 08:54:56,953 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 317 GetRequests, 185 SyntacticMatches, 41 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3217 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1747, Invalid=6809, Unknown=0, NotChecked=0, Total=8556 [2022-12-14 08:54:56,954 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 7 mSDsluCounter, 201 mSDsCounter, 0 mSdLazyCounter, 444 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 223 SdHoareTripleChecker+Invalid, 444 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 444 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:56,954 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 223 Invalid, 444 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 444 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:54:56,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2022-12-14 08:54:56,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2022-12-14 08:54:56,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 86 states have (on average 1.0232558139534884) internal successors, (88), 86 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:56,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 88 transitions. [2022-12-14 08:54:56,972 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 88 transitions. Word has length 85 [2022-12-14 08:54:56,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:56,972 INFO L495 AbstractCegarLoop]: Abstraction has 87 states and 88 transitions. [2022-12-14 08:54:56,972 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 2.283582089552239) internal successors, (153), 66 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:56,972 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 88 transitions. [2022-12-14 08:54:56,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2022-12-14 08:54:56,973 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:56,973 INFO L195 NwaCegarLoop]: trace histogram [21, 21, 20, 20, 1, 1, 1, 1] [2022-12-14 08:54:56,977 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2022-12-14 08:54:57,173 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:57,174 INFO L420 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:57,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:57,175 INFO L85 PathProgramCache]: Analyzing trace with hash 1587120463, now seen corresponding path program 40 times [2022-12-14 08:54:57,175 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:57,175 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [17622275] [2022-12-14 08:54:57,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:57,175 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:57,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:57,498 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 210 proven. 631 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:57,499 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:57,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [17622275] [2022-12-14 08:54:57,499 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [17622275] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:57,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [621632838] [2022-12-14 08:54:57,499 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:54:57,499 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:57,499 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:57,500 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:57,500 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-12-14 08:54:57,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:57,567 INFO L263 TraceCheckSpWp]: Trace formula consists of 343 conjuncts, 48 conjunts are in the unsatisfiable core [2022-12-14 08:54:57,568 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:54:57,660 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 231 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:57,660 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:54:57,975 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 231 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:57,975 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [621632838] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:54:57,975 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1886467726] [2022-12-14 08:54:57,975 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:54:57,976 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:54:57,976 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:54:57,976 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:54:57,976 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:54:58,019 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:54:58,224 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21558#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:54:58,224 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:54:58,224 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:54:58,224 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 26 [2022-12-14 08:54:58,224 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1558597551] [2022-12-14 08:54:58,225 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:54:58,225 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-12-14 08:54:58,225 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:58,226 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-12-14 08:54:58,226 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=305, Invalid=687, Unknown=0, NotChecked=0, Total=992 [2022-12-14 08:54:58,226 INFO L87 Difference]: Start difference. First operand 87 states and 88 transitions. Second operand has 27 states, 27 states have (on average 3.3333333333333335) internal successors, (90), 26 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:58,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:58,515 INFO L93 Difference]: Finished difference Result 98 states and 99 transitions. [2022-12-14 08:54:58,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-12-14 08:54:58,516 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 3.3333333333333335) internal successors, (90), 26 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 86 [2022-12-14 08:54:58,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:58,516 INFO L225 Difference]: With dead ends: 98 [2022-12-14 08:54:58,517 INFO L226 Difference]: Without dead ends: 96 [2022-12-14 08:54:58,517 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 323 GetRequests, 228 SyntacticMatches, 42 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1266 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=906, Invalid=2064, Unknown=0, NotChecked=0, Total=2970 [2022-12-14 08:54:58,517 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 92 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 201 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 204 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 201 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:58,517 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [92 Valid, 19 Invalid, 204 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 201 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:54:58,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2022-12-14 08:54:58,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 90. [2022-12-14 08:54:58,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 89 states have (on average 1.0224719101123596) internal successors, (91), 89 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:58,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 91 transitions. [2022-12-14 08:54:58,529 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 91 transitions. Word has length 86 [2022-12-14 08:54:58,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:58,530 INFO L495 AbstractCegarLoop]: Abstraction has 90 states and 91 transitions. [2022-12-14 08:54:58,530 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 3.3333333333333335) internal successors, (90), 26 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:58,530 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 91 transitions. [2022-12-14 08:54:58,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2022-12-14 08:54:58,530 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:58,530 INFO L195 NwaCegarLoop]: trace histogram [22, 21, 21, 21, 1, 1, 1, 1] [2022-12-14 08:54:58,534 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Ended with exit code 0 [2022-12-14 08:54:58,731 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:58,731 INFO L420 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:58,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:58,732 INFO L85 PathProgramCache]: Analyzing trace with hash -1384428150, now seen corresponding path program 41 times [2022-12-14 08:54:58,732 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:58,733 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1206894202] [2022-12-14 08:54:58,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:58,733 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:58,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:59,486 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 611 proven. 292 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:59,487 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:59,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1206894202] [2022-12-14 08:54:59,487 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1206894202] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:59,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [841399033] [2022-12-14 08:54:59,487 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:54:59,487 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:59,487 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:59,488 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:59,489 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2022-12-14 08:54:59,562 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2022-12-14 08:54:59,562 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:54:59,564 INFO L263 TraceCheckSpWp]: Trace formula consists of 353 conjuncts, 46 conjunts are in the unsatisfiable core [2022-12-14 08:54:59,565 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:55:00,173 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 672 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:00,174 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:55:00,548 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 672 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:00,549 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [841399033] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:55:00,549 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1903021225] [2022-12-14 08:55:00,549 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:55:00,549 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:55:00,549 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:55:00,549 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:55:00,550 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:55:00,594 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:55:00,860 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22528#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:55:00,860 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:55:00,860 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:55:00,860 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 69 [2022-12-14 08:55:00,860 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [834256709] [2022-12-14 08:55:00,860 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:55:00,861 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2022-12-14 08:55:00,861 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:55:00,861 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2022-12-14 08:55:00,861 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1123, Invalid=4427, Unknown=0, NotChecked=0, Total=5550 [2022-12-14 08:55:00,862 INFO L87 Difference]: Start difference. First operand 90 states and 91 transitions. Second operand has 70 states, 70 states have (on average 2.2857142857142856) internal successors, (160), 69 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:01,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:55:01,267 INFO L93 Difference]: Finished difference Result 160 states and 162 transitions. [2022-12-14 08:55:01,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-12-14 08:55:01,268 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 2.2857142857142856) internal successors, (160), 69 states have internal predecessors, (160), 0 states have call successors, (0), 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 89 [2022-12-14 08:55:01,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:55:01,268 INFO L225 Difference]: With dead ends: 160 [2022-12-14 08:55:01,268 INFO L226 Difference]: Without dead ends: 91 [2022-12-14 08:55:01,268 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 194 SyntacticMatches, 43 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3503 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1906, Invalid=7406, Unknown=0, NotChecked=0, Total=9312 [2022-12-14 08:55:01,269 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 7 mSDsluCounter, 176 mSDsCounter, 0 mSdLazyCounter, 393 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 199 SdHoareTripleChecker+Invalid, 393 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 393 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:55:01,269 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 199 Invalid, 393 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 393 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:55:01,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2022-12-14 08:55:01,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2022-12-14 08:55:01,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 90 states have (on average 1.0222222222222221) internal successors, (92), 90 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:01,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 92 transitions. [2022-12-14 08:55:01,280 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 92 transitions. Word has length 89 [2022-12-14 08:55:01,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:55:01,280 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 92 transitions. [2022-12-14 08:55:01,281 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 70 states, 70 states have (on average 2.2857142857142856) internal successors, (160), 69 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:01,281 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 92 transitions. [2022-12-14 08:55:01,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2022-12-14 08:55:01,281 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:55:01,281 INFO L195 NwaCegarLoop]: trace histogram [22, 22, 21, 21, 1, 1, 1, 1] [2022-12-14 08:55:01,285 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Ended with exit code 0 [2022-12-14 08:55:01,482 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2022-12-14 08:55:01,482 INFO L420 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:55:01,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:55:01,483 INFO L85 PathProgramCache]: Analyzing trace with hash -497091323, now seen corresponding path program 42 times [2022-12-14 08:55:01,483 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:55:01,483 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [235398668] [2022-12-14 08:55:01,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:55:01,484 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:55:01,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:55:01,930 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 231 proven. 694 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:01,931 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:55:01,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [235398668] [2022-12-14 08:55:01,931 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [235398668] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:55:01,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1064696083] [2022-12-14 08:55:01,931 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:55:01,931 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:55:01,931 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:55:01,932 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:55:01,933 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2022-12-14 08:55:01,985 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:55:01,985 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:55:01,987 INFO L263 TraceCheckSpWp]: Trace formula consists of 358 conjuncts, 50 conjunts are in the unsatisfiable core [2022-12-14 08:55:01,989 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:55:02,069 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 253 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:02,069 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:55:02,418 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 253 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:02,418 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1064696083] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:55:02,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1637266380] [2022-12-14 08:55:02,419 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:55:02,419 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:55:02,419 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:55:02,420 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:55:02,420 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:55:02,465 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:55:02,715 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23567#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:55:02,715 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:55:02,715 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:55:02,715 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 27 [2022-12-14 08:55:02,715 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1164798329] [2022-12-14 08:55:02,715 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:55:02,715 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-12-14 08:55:02,715 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:55:02,716 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-12-14 08:55:02,716 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=329, Invalid=727, Unknown=0, NotChecked=0, Total=1056 [2022-12-14 08:55:02,716 INFO L87 Difference]: Start difference. First operand 91 states and 92 transitions. Second operand has 28 states, 28 states have (on average 3.357142857142857) internal successors, (94), 27 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:02,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:55:02,977 INFO L93 Difference]: Finished difference Result 102 states and 103 transitions. [2022-12-14 08:55:02,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2022-12-14 08:55:02,978 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 3.357142857142857) internal successors, (94), 27 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 90 [2022-12-14 08:55:02,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:55:02,978 INFO L225 Difference]: With dead ends: 102 [2022-12-14 08:55:02,978 INFO L226 Difference]: Without dead ends: 100 [2022-12-14 08:55:02,979 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 338 GetRequests, 239 SyntacticMatches, 44 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1370 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=980, Invalid=2212, Unknown=0, NotChecked=0, Total=3192 [2022-12-14 08:55:02,979 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 98 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 224 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 227 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 224 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:55:02,979 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [98 Valid, 23 Invalid, 227 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 224 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:55:02,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2022-12-14 08:55:02,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 94. [2022-12-14 08:55:02,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 93 states have (on average 1.021505376344086) internal successors, (95), 93 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:02,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 95 transitions. [2022-12-14 08:55:02,991 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 95 transitions. Word has length 90 [2022-12-14 08:55:02,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:55:02,992 INFO L495 AbstractCegarLoop]: Abstraction has 94 states and 95 transitions. [2022-12-14 08:55:02,992 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 3.357142857142857) internal successors, (94), 27 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:02,992 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 95 transitions. [2022-12-14 08:55:02,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2022-12-14 08:55:02,992 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:55:02,992 INFO L195 NwaCegarLoop]: trace histogram [23, 22, 22, 22, 1, 1, 1, 1] [2022-12-14 08:55:02,997 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Ended with exit code 0 [2022-12-14 08:55:03,193 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:55:03,194 INFO L420 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:55:03,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:55:03,195 INFO L85 PathProgramCache]: Analyzing trace with hash 204453396, now seen corresponding path program 43 times [2022-12-14 08:55:03,195 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:55:03,195 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1630136180] [2022-12-14 08:55:03,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:55:03,196 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:55:03,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:55:03,888 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 673 proven. 317 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:03,888 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:55:03,888 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1630136180] [2022-12-14 08:55:03,888 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1630136180] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:55:03,888 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1731443274] [2022-12-14 08:55:03,888 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:55:03,888 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:55:03,889 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:55:03,889 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:55:03,892 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2022-12-14 08:55:03,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:55:03,945 INFO L263 TraceCheckSpWp]: Trace formula consists of 368 conjuncts, 48 conjunts are in the unsatisfiable core [2022-12-14 08:55:03,946 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:55:04,580 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 737 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:04,580 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:55:05,036 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 737 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:05,036 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1731443274] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:55:05,037 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1430125068] [2022-12-14 08:55:05,037 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:55:05,037 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:55:05,037 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:55:05,037 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:55:05,037 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:55:05,083 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:55:05,289 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24580#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:55:05,290 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:55:05,290 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:55:05,290 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 72 [2022-12-14 08:55:05,290 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1107560607] [2022-12-14 08:55:05,290 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:55:05,290 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2022-12-14 08:55:05,290 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:55:05,291 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2022-12-14 08:55:05,291 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1219, Invalid=4787, Unknown=0, NotChecked=0, Total=6006 [2022-12-14 08:55:05,292 INFO L87 Difference]: Start difference. First operand 94 states and 95 transitions. Second operand has 73 states, 73 states have (on average 2.287671232876712) internal successors, (167), 72 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:05,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:55:05,773 INFO L93 Difference]: Finished difference Result 167 states and 169 transitions. [2022-12-14 08:55:05,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2022-12-14 08:55:05,774 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 2.287671232876712) internal successors, (167), 72 states have internal predecessors, (167), 0 states have call successors, (0), 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 93 [2022-12-14 08:55:05,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:55:05,774 INFO L225 Difference]: With dead ends: 167 [2022-12-14 08:55:05,774 INFO L226 Difference]: Without dead ends: 95 [2022-12-14 08:55:05,775 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 347 GetRequests, 203 SyntacticMatches, 45 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3801 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2072, Invalid=8028, Unknown=0, NotChecked=0, Total=10100 [2022-12-14 08:55:05,775 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 7 mSDsluCounter, 196 mSDsCounter, 0 mSdLazyCounter, 445 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 220 SdHoareTripleChecker+Invalid, 445 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 445 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:55:05,775 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 220 Invalid, 445 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 445 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:55:05,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2022-12-14 08:55:05,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2022-12-14 08:55:05,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 94 states have (on average 1.0212765957446808) internal successors, (96), 94 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:05,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 96 transitions. [2022-12-14 08:55:05,788 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 96 transitions. Word has length 93 [2022-12-14 08:55:05,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:55:05,788 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 96 transitions. [2022-12-14 08:55:05,788 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 2.287671232876712) internal successors, (167), 72 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:05,788 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 96 transitions. [2022-12-14 08:55:05,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2022-12-14 08:55:05,788 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:55:05,788 INFO L195 NwaCegarLoop]: trace histogram [23, 23, 22, 22, 1, 1, 1, 1] [2022-12-14 08:55:05,792 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Ended with exit code 0 [2022-12-14 08:55:05,989 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2022-12-14 08:55:05,989 INFO L420 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:55:05,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:55:05,989 INFO L85 PathProgramCache]: Analyzing trace with hash -1066848241, now seen corresponding path program 44 times [2022-12-14 08:55:05,989 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:55:05,989 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1493572437] [2022-12-14 08:55:05,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:55:05,990 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:55:06,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:55:06,388 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 253 proven. 760 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:06,389 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:55:06,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1493572437] [2022-12-14 08:55:06,389 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1493572437] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:55:06,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1657187230] [2022-12-14 08:55:06,389 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:55:06,389 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:55:06,389 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:55:06,390 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:55:06,390 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2022-12-14 08:55:06,469 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2022-12-14 08:55:06,469 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:55:06,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 373 conjuncts, 52 conjunts are in the unsatisfiable core [2022-12-14 08:55:06,473 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:55:06,556 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 276 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:06,557 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:55:06,911 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 276 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:06,912 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1657187230] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:55:06,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [703606147] [2022-12-14 08:55:06,912 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:55:06,912 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:55:06,913 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:55:06,913 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:55:06,913 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:55:06,953 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:55:07,096 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '25665#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:55:07,096 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:55:07,096 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:55:07,096 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 28 [2022-12-14 08:55:07,096 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2095998373] [2022-12-14 08:55:07,096 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:55:07,097 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-12-14 08:55:07,097 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:55:07,097 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-12-14 08:55:07,097 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=354, Invalid=768, Unknown=0, NotChecked=0, Total=1122 [2022-12-14 08:55:07,097 INFO L87 Difference]: Start difference. First operand 95 states and 96 transitions. Second operand has 29 states, 29 states have (on average 3.3793103448275863) internal successors, (98), 28 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:07,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:55:07,355 INFO L93 Difference]: Finished difference Result 106 states and 107 transitions. [2022-12-14 08:55:07,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2022-12-14 08:55:07,355 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 3.3793103448275863) internal successors, (98), 28 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) Word has length 94 [2022-12-14 08:55:07,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:55:07,356 INFO L225 Difference]: With dead ends: 106 [2022-12-14 08:55:07,356 INFO L226 Difference]: Without dead ends: 104 [2022-12-14 08:55:07,356 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 353 GetRequests, 250 SyntacticMatches, 46 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1478 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1057, Invalid=2365, Unknown=0, NotChecked=0, Total=3422 [2022-12-14 08:55:07,356 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 102 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 246 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 102 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 249 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 246 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:55:07,357 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [102 Valid, 15 Invalid, 249 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 246 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:55:07,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2022-12-14 08:55:07,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 98. [2022-12-14 08:55:07,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 97 states have (on average 1.0206185567010309) internal successors, (99), 97 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:07,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 99 transitions. [2022-12-14 08:55:07,370 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 99 transitions. Word has length 94 [2022-12-14 08:55:07,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:55:07,370 INFO L495 AbstractCegarLoop]: Abstraction has 98 states and 99 transitions. [2022-12-14 08:55:07,370 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 3.3793103448275863) internal successors, (98), 28 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:07,370 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 99 transitions. [2022-12-14 08:55:07,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2022-12-14 08:55:07,370 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:55:07,370 INFO L195 NwaCegarLoop]: trace histogram [24, 23, 23, 23, 1, 1, 1, 1] [2022-12-14 08:55:07,374 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Ended with exit code 0 [2022-12-14 08:55:07,571 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:55:07,572 INFO L420 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:55:07,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:55:07,572 INFO L85 PathProgramCache]: Analyzing trace with hash 286863050, now seen corresponding path program 45 times [2022-12-14 08:55:07,572 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:55:07,573 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [887003495] [2022-12-14 08:55:07,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:55:07,573 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:55:07,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:55:08,313 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 738 proven. 343 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:08,313 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:55:08,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [887003495] [2022-12-14 08:55:08,313 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [887003495] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:55:08,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [418206214] [2022-12-14 08:55:08,313 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:55:08,313 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:55:08,313 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:55:08,314 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:55:08,315 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2022-12-14 08:55:08,372 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:55:08,372 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:55:08,374 INFO L263 TraceCheckSpWp]: Trace formula consists of 383 conjuncts, 50 conjunts are in the unsatisfiable core [2022-12-14 08:55:08,375 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:55:09,108 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 805 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:09,108 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:55:09,634 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 805 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:09,634 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [418206214] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:55:09,634 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2140701237] [2022-12-14 08:55:09,635 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:55:09,635 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:55:09,635 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:55:09,635 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:55:09,635 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:55:09,675 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:55:09,877 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26721#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:55:09,877 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:55:09,877 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:55:09,877 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 75 [2022-12-14 08:55:09,877 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [389442657] [2022-12-14 08:55:09,878 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:55:09,878 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 76 states [2022-12-14 08:55:09,878 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:55:09,878 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2022-12-14 08:55:09,879 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1319, Invalid=5161, Unknown=0, NotChecked=0, Total=6480 [2022-12-14 08:55:09,879 INFO L87 Difference]: Start difference. First operand 98 states and 99 transitions. Second operand has 76 states, 76 states have (on average 2.289473684210526) internal successors, (174), 75 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:10,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:55:10,439 INFO L93 Difference]: Finished difference Result 174 states and 176 transitions. [2022-12-14 08:55:10,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-12-14 08:55:10,439 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 76 states have (on average 2.289473684210526) internal successors, (174), 75 states have internal predecessors, (174), 0 states have call successors, (0), 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 97 [2022-12-14 08:55:10,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:55:10,439 INFO L225 Difference]: With dead ends: 174 [2022-12-14 08:55:10,439 INFO L226 Difference]: Without dead ends: 99 [2022-12-14 08:55:10,440 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 362 GetRequests, 212 SyntacticMatches, 47 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4111 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=2245, Invalid=8675, Unknown=0, NotChecked=0, Total=10920 [2022-12-14 08:55:10,440 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 7 mSDsluCounter, 231 mSDsCounter, 0 mSdLazyCounter, 514 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 256 SdHoareTripleChecker+Invalid, 514 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 514 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:55:10,441 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 256 Invalid, 514 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 514 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:55:10,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-12-14 08:55:10,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2022-12-14 08:55:10,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 98 states have (on average 1.0204081632653061) internal successors, (100), 98 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:10,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 100 transitions. [2022-12-14 08:55:10,454 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 100 transitions. Word has length 97 [2022-12-14 08:55:10,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:55:10,454 INFO L495 AbstractCegarLoop]: Abstraction has 99 states and 100 transitions. [2022-12-14 08:55:10,454 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 76 states, 76 states have (on average 2.289473684210526) internal successors, (174), 75 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:10,454 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 100 transitions. [2022-12-14 08:55:10,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2022-12-14 08:55:10,455 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:55:10,455 INFO L195 NwaCegarLoop]: trace histogram [24, 24, 23, 23, 1, 1, 1, 1] [2022-12-14 08:55:10,459 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Ended with exit code 0 [2022-12-14 08:55:10,655 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:55:10,656 INFO L420 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:55:10,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:55:10,657 INFO L85 PathProgramCache]: Analyzing trace with hash -1212206267, now seen corresponding path program 46 times [2022-12-14 08:55:10,657 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:55:10,657 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2130908668] [2022-12-14 08:55:10,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:55:10,658 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:55:10,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:55:11,109 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 276 proven. 829 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:11,109 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:55:11,109 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2130908668] [2022-12-14 08:55:11,109 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2130908668] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:55:11,109 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [809639290] [2022-12-14 08:55:11,109 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:55:11,109 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:55:11,109 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:55:11,110 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:55:11,110 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2022-12-14 08:55:11,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:55:11,171 INFO L263 TraceCheckSpWp]: Trace formula consists of 388 conjuncts, 54 conjunts are in the unsatisfiable core [2022-12-14 08:55:11,172 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:55:11,267 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 300 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:11,267 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:55:11,572 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 300 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:11,572 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [809639290] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:55:11,572 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [994362493] [2022-12-14 08:55:11,572 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:55:11,572 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:55:11,572 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:55:11,573 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:55:11,573 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:55:11,622 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:55:11,767 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '27852#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:55:11,767 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:55:11,767 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:55:11,767 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 29 [2022-12-14 08:55:11,767 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [641667656] [2022-12-14 08:55:11,767 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:55:11,767 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-12-14 08:55:11,767 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:55:11,767 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-12-14 08:55:11,768 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=380, Invalid=810, Unknown=0, NotChecked=0, Total=1190 [2022-12-14 08:55:11,768 INFO L87 Difference]: Start difference. First operand 99 states and 100 transitions. Second operand has 30 states, 30 states have (on average 3.4) internal successors, (102), 29 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:12,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:55:12,045 INFO L93 Difference]: Finished difference Result 110 states and 111 transitions. [2022-12-14 08:55:12,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2022-12-14 08:55:12,045 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 3.4) internal successors, (102), 29 states have internal predecessors, (102), 0 states have call successors, (0), 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 98 [2022-12-14 08:55:12,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:55:12,046 INFO L225 Difference]: With dead ends: 110 [2022-12-14 08:55:12,046 INFO L226 Difference]: Without dead ends: 108 [2022-12-14 08:55:12,046 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 368 GetRequests, 261 SyntacticMatches, 48 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1590 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1137, Invalid=2523, Unknown=0, NotChecked=0, Total=3660 [2022-12-14 08:55:12,047 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 104 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 231 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 104 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 234 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 231 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:55:12,047 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [104 Valid, 15 Invalid, 234 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 231 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:55:12,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2022-12-14 08:55:12,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 102. [2022-12-14 08:55:12,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 101 states have (on average 1.0198019801980198) internal successors, (103), 101 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:12,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 103 transitions. [2022-12-14 08:55:12,061 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 103 transitions. Word has length 98 [2022-12-14 08:55:12,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:55:12,061 INFO L495 AbstractCegarLoop]: Abstraction has 102 states and 103 transitions. [2022-12-14 08:55:12,061 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 3.4) internal successors, (102), 29 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:12,061 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 103 transitions. [2022-12-14 08:55:12,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2022-12-14 08:55:12,062 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:55:12,062 INFO L195 NwaCegarLoop]: trace histogram [25, 24, 24, 24, 1, 1, 1, 1] [2022-12-14 08:55:12,066 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Ended with exit code 0 [2022-12-14 08:55:12,263 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2022-12-14 08:55:12,263 INFO L420 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:55:12,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:55:12,264 INFO L85 PathProgramCache]: Analyzing trace with hash -747055148, now seen corresponding path program 47 times [2022-12-14 08:55:12,265 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:55:12,265 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1332301973] [2022-12-14 08:55:12,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:55:12,266 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:55:12,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:55:13,133 INFO L134 CoverageAnalysis]: Checked inductivity of 1176 backedges. 806 proven. 370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:13,133 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:55:13,133 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1332301973] [2022-12-14 08:55:13,134 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1332301973] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:55:13,134 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [264667042] [2022-12-14 08:55:13,134 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:55:13,134 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:55:13,134 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:55:13,135 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:55:13,135 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2022-12-14 08:55:13,214 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2022-12-14 08:55:13,214 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:55:13,216 INFO L263 TraceCheckSpWp]: Trace formula consists of 398 conjuncts, 52 conjunts are in the unsatisfiable core [2022-12-14 08:55:13,217 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:55:14,156 INFO L134 CoverageAnalysis]: Checked inductivity of 1176 backedges. 876 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:14,156 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:55:14,869 INFO L134 CoverageAnalysis]: Checked inductivity of 1176 backedges. 876 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:14,869 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [264667042] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:55:14,869 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1344452592] [2022-12-14 08:55:14,870 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:55:14,870 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:55:14,870 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:55:14,870 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:55:14,870 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:55:14,918 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:55:15,214 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '28951#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:55:15,214 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:55:15,214 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:55:15,214 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 78 [2022-12-14 08:55:15,214 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [298289995] [2022-12-14 08:55:15,214 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:55:15,214 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2022-12-14 08:55:15,215 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:55:15,215 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2022-12-14 08:55:15,216 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1423, Invalid=5549, Unknown=0, NotChecked=0, Total=6972 [2022-12-14 08:55:15,216 INFO L87 Difference]: Start difference. First operand 102 states and 103 transitions. Second operand has 79 states, 79 states have (on average 2.2911392405063293) internal successors, (181), 78 states have internal predecessors, (181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:15,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:55:15,857 INFO L93 Difference]: Finished difference Result 181 states and 183 transitions. [2022-12-14 08:55:15,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2022-12-14 08:55:15,857 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 2.2911392405063293) internal successors, (181), 78 states have internal predecessors, (181), 0 states have call successors, (0), 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 101 [2022-12-14 08:55:15,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:55:15,858 INFO L225 Difference]: With dead ends: 181 [2022-12-14 08:55:15,858 INFO L226 Difference]: Without dead ends: 103 [2022-12-14 08:55:15,858 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 377 GetRequests, 221 SyntacticMatches, 49 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4433 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=2425, Invalid=9347, Unknown=0, NotChecked=0, Total=11772 [2022-12-14 08:55:15,859 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 7 mSDsluCounter, 210 mSDsCounter, 0 mSdLazyCounter, 469 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 236 SdHoareTripleChecker+Invalid, 469 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 469 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:55:15,859 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 236 Invalid, 469 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 469 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:55:15,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2022-12-14 08:55:15,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2022-12-14 08:55:15,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 102 states have (on average 1.0196078431372548) internal successors, (104), 102 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) [2022-12-14 08:55:15,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 104 transitions. [2022-12-14 08:55:15,873 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 104 transitions. Word has length 101 [2022-12-14 08:55:15,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:55:15,873 INFO L495 AbstractCegarLoop]: Abstraction has 103 states and 104 transitions. [2022-12-14 08:55:15,873 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 79 states have (on average 2.2911392405063293) internal successors, (181), 78 states have internal predecessors, (181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:15,873 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 104 transitions. [2022-12-14 08:55:15,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2022-12-14 08:55:15,874 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:55:15,874 INFO L195 NwaCegarLoop]: trace histogram [25, 25, 24, 24, 1, 1, 1, 1] [2022-12-14 08:55:15,879 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Ended with exit code 0 [2022-12-14 08:55:16,074 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2022-12-14 08:55:16,075 INFO L420 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:55:16,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:55:16,076 INFO L85 PathProgramCache]: Analyzing trace with hash -163436849, now seen corresponding path program 48 times [2022-12-14 08:55:16,076 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:55:16,076 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [48164852] [2022-12-14 08:55:16,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:55:16,077 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:55:16,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:55:16,634 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 300 proven. 901 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:16,634 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:55:16,634 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [48164852] [2022-12-14 08:55:16,634 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [48164852] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:55:16,634 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2101227510] [2022-12-14 08:55:16,634 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:55:16,634 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:55:16,634 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:55:16,635 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:55:16,636 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2022-12-14 08:55:16,691 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:55:16,691 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:55:16,694 INFO L263 TraceCheckSpWp]: Trace formula consists of 403 conjuncts, 56 conjunts are in the unsatisfiable core [2022-12-14 08:55:16,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:55:16,785 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 325 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:16,785 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:55:17,193 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 325 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:17,193 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2101227510] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:55:17,193 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1454259221] [2022-12-14 08:55:17,194 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:55:17,194 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:55:17,195 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:55:17,195 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:55:17,195 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:55:17,243 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:55:17,416 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30128#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:55:17,417 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:55:17,417 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:55:17,417 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 30 [2022-12-14 08:55:17,417 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1918551512] [2022-12-14 08:55:17,417 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:55:17,417 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-12-14 08:55:17,417 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:55:17,418 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-12-14 08:55:17,418 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=407, Invalid=853, Unknown=0, NotChecked=0, Total=1260 [2022-12-14 08:55:17,418 INFO L87 Difference]: Start difference. First operand 103 states and 104 transitions. Second operand has 31 states, 31 states have (on average 3.4193548387096775) internal successors, (106), 30 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:17,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:55:17,719 INFO L93 Difference]: Finished difference Result 114 states and 115 transitions. [2022-12-14 08:55:17,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2022-12-14 08:55:17,720 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 3.4193548387096775) internal successors, (106), 30 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 102 [2022-12-14 08:55:17,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:55:17,720 INFO L225 Difference]: With dead ends: 114 [2022-12-14 08:55:17,720 INFO L226 Difference]: Without dead ends: 112 [2022-12-14 08:55:17,720 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 383 GetRequests, 272 SyntacticMatches, 50 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1706 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1220, Invalid=2686, Unknown=0, NotChecked=0, Total=3906 [2022-12-14 08:55:17,721 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 58 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 286 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 289 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 286 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:55:17,721 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [58 Valid, 12 Invalid, 289 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 286 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:55:17,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2022-12-14 08:55:17,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 106. [2022-12-14 08:55:17,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 105 states have (on average 1.019047619047619) internal successors, (107), 105 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:17,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 107 transitions. [2022-12-14 08:55:17,736 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 107 transitions. Word has length 102 [2022-12-14 08:55:17,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:55:17,736 INFO L495 AbstractCegarLoop]: Abstraction has 106 states and 107 transitions. [2022-12-14 08:55:17,736 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 3.4193548387096775) internal successors, (106), 30 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:17,736 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 107 transitions. [2022-12-14 08:55:17,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2022-12-14 08:55:17,737 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:55:17,737 INFO L195 NwaCegarLoop]: trace histogram [26, 25, 25, 25, 1, 1, 1, 1] [2022-12-14 08:55:17,741 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Ended with exit code 0 [2022-12-14 08:55:17,937 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2022-12-14 08:55:17,937 INFO L420 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:55:17,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:55:17,937 INFO L85 PathProgramCache]: Analyzing trace with hash 1550565386, now seen corresponding path program 49 times [2022-12-14 08:55:17,938 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:55:17,938 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [655841966] [2022-12-14 08:55:17,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:55:17,938 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:55:17,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:55:18,859 INFO L134 CoverageAnalysis]: Checked inductivity of 1275 backedges. 877 proven. 398 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:18,860 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:55:18,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [655841966] [2022-12-14 08:55:18,860 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [655841966] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:55:18,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [536586244] [2022-12-14 08:55:18,860 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:55:18,860 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:55:18,860 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:55:18,861 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:55:18,861 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2022-12-14 08:55:18,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:55:18,923 INFO L263 TraceCheckSpWp]: Trace formula consists of 413 conjuncts, 54 conjunts are in the unsatisfiable core [2022-12-14 08:55:18,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:55:19,878 INFO L134 CoverageAnalysis]: Checked inductivity of 1275 backedges. 950 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:19,878 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:55:20,506 INFO L134 CoverageAnalysis]: Checked inductivity of 1275 backedges. 950 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:20,507 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [536586244] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:55:20,507 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1110358497] [2022-12-14 08:55:20,508 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:55:20,508 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:55:20,508 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:55:20,508 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:55:20,508 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:55:20,549 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:55:20,908 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '31270#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:55:20,908 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:55:20,908 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:55:20,908 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 81 [2022-12-14 08:55:20,909 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1754084927] [2022-12-14 08:55:20,909 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:55:20,909 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 82 states [2022-12-14 08:55:20,909 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:55:20,910 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2022-12-14 08:55:20,910 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1531, Invalid=5951, Unknown=0, NotChecked=0, Total=7482 [2022-12-14 08:55:20,910 INFO L87 Difference]: Start difference. First operand 106 states and 107 transitions. Second operand has 82 states, 82 states have (on average 2.292682926829268) internal successors, (188), 81 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:21,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:55:21,509 INFO L93 Difference]: Finished difference Result 188 states and 190 transitions. [2022-12-14 08:55:21,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-12-14 08:55:21,509 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 82 states have (on average 2.292682926829268) internal successors, (188), 81 states have internal predecessors, (188), 0 states have call successors, (0), 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 105 [2022-12-14 08:55:21,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:55:21,510 INFO L225 Difference]: With dead ends: 188 [2022-12-14 08:55:21,510 INFO L226 Difference]: Without dead ends: 107 [2022-12-14 08:55:21,511 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 392 GetRequests, 230 SyntacticMatches, 51 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4767 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=2612, Invalid=10044, Unknown=0, NotChecked=0, Total=12656 [2022-12-14 08:55:21,511 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 7 mSDsluCounter, 216 mSDsCounter, 0 mSdLazyCounter, 494 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 243 SdHoareTripleChecker+Invalid, 494 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 494 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:55:21,511 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 243 Invalid, 494 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 494 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:55:21,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2022-12-14 08:55:21,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2022-12-14 08:55:21,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 106 states have (on average 1.0188679245283019) internal successors, (108), 106 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:21,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 108 transitions. [2022-12-14 08:55:21,537 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 108 transitions. Word has length 105 [2022-12-14 08:55:21,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:55:21,537 INFO L495 AbstractCegarLoop]: Abstraction has 107 states and 108 transitions. [2022-12-14 08:55:21,538 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 82 states, 82 states have (on average 2.292682926829268) internal successors, (188), 81 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:21,538 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 108 transitions. [2022-12-14 08:55:21,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2022-12-14 08:55:21,538 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:55:21,538 INFO L195 NwaCegarLoop]: trace histogram [26, 26, 25, 25, 1, 1, 1, 1] [2022-12-14 08:55:21,543 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Ended with exit code 0 [2022-12-14 08:55:21,739 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:55:21,739 INFO L420 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:55:21,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:55:21,740 INFO L85 PathProgramCache]: Analyzing trace with hash 1269766533, now seen corresponding path program 50 times [2022-12-14 08:55:21,741 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:55:21,741 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [140776451] [2022-12-14 08:55:21,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:55:21,741 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:55:21,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:55:22,296 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 325 proven. 976 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:22,297 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:55:22,297 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [140776451] [2022-12-14 08:55:22,297 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [140776451] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:55:22,297 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2138301633] [2022-12-14 08:55:22,297 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:55:22,297 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:55:22,297 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:55:22,298 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:55:22,298 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2022-12-14 08:55:22,385 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2022-12-14 08:55:22,385 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:55:22,387 INFO L263 TraceCheckSpWp]: Trace formula consists of 418 conjuncts, 58 conjunts are in the unsatisfiable core [2022-12-14 08:55:22,389 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:55:22,500 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 351 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:22,500 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:55:22,911 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 351 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:22,911 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2138301633] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:55:22,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1894863675] [2022-12-14 08:55:22,912 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:55:22,912 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:55:22,912 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:55:22,912 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:55:22,912 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:55:22,956 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:55:23,113 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '32493#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:55:23,114 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:55:23,114 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:55:23,114 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 31 [2022-12-14 08:55:23,114 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [331949057] [2022-12-14 08:55:23,114 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:55:23,114 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-12-14 08:55:23,114 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:55:23,114 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-12-14 08:55:23,115 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=897, Unknown=0, NotChecked=0, Total=1332 [2022-12-14 08:55:23,115 INFO L87 Difference]: Start difference. First operand 107 states and 108 transitions. Second operand has 32 states, 32 states have (on average 3.4375) internal successors, (110), 31 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) [2022-12-14 08:55:23,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:55:23,398 INFO L93 Difference]: Finished difference Result 118 states and 119 transitions. [2022-12-14 08:55:23,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2022-12-14 08:55:23,398 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 3.4375) internal successors, (110), 31 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) Word has length 106 [2022-12-14 08:55:23,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:55:23,399 INFO L225 Difference]: With dead ends: 118 [2022-12-14 08:55:23,399 INFO L226 Difference]: Without dead ends: 116 [2022-12-14 08:55:23,399 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 398 GetRequests, 283 SyntacticMatches, 52 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1826 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1306, Invalid=2854, Unknown=0, NotChecked=0, Total=4160 [2022-12-14 08:55:23,399 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 112 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 268 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 112 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 271 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 268 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:55:23,399 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [112 Valid, 21 Invalid, 271 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 268 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:55:23,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2022-12-14 08:55:23,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 110. [2022-12-14 08:55:23,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 109 states have (on average 1.018348623853211) internal successors, (111), 109 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) [2022-12-14 08:55:23,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 111 transitions. [2022-12-14 08:55:23,416 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 111 transitions. Word has length 106 [2022-12-14 08:55:23,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:55:23,416 INFO L495 AbstractCegarLoop]: Abstraction has 110 states and 111 transitions. [2022-12-14 08:55:23,416 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 3.4375) internal successors, (110), 31 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) [2022-12-14 08:55:23,416 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 111 transitions. [2022-12-14 08:55:23,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2022-12-14 08:55:23,416 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:55:23,416 INFO L195 NwaCegarLoop]: trace histogram [27, 26, 26, 26, 1, 1, 1, 1] [2022-12-14 08:55:23,421 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Ended with exit code 0 [2022-12-14 08:55:23,617 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:55:23,617 INFO L420 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:55:23,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:55:23,617 INFO L85 PathProgramCache]: Analyzing trace with hash 1842629012, now seen corresponding path program 51 times [2022-12-14 08:55:23,617 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:55:23,617 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [859238628] [2022-12-14 08:55:23,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:55:23,617 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:55:23,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:55:24,524 INFO L134 CoverageAnalysis]: Checked inductivity of 1378 backedges. 951 proven. 427 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:24,524 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:55:24,524 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [859238628] [2022-12-14 08:55:24,524 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [859238628] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:55:24,524 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [213700489] [2022-12-14 08:55:24,524 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:55:24,525 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:55:24,525 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:55:24,525 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:55:24,526 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2022-12-14 08:55:24,583 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:55:24,583 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:55:24,585 INFO L263 TraceCheckSpWp]: Trace formula consists of 428 conjuncts, 56 conjunts are in the unsatisfiable core [2022-12-14 08:55:24,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:55:25,554 INFO L134 CoverageAnalysis]: Checked inductivity of 1378 backedges. 1027 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:25,554 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:55:26,149 INFO L134 CoverageAnalysis]: Checked inductivity of 1378 backedges. 1027 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:26,149 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [213700489] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:55:26,149 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [895726063] [2022-12-14 08:55:26,149 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:55:26,149 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:55:26,149 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:55:26,150 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:55:26,150 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:55:26,198 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:55:26,441 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '33678#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:55:26,441 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:55:26,441 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:55:26,441 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 84 [2022-12-14 08:55:26,441 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [590682321] [2022-12-14 08:55:26,441 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:55:26,441 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 85 states [2022-12-14 08:55:26,442 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:55:26,442 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2022-12-14 08:55:26,442 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1643, Invalid=6367, Unknown=0, NotChecked=0, Total=8010 [2022-12-14 08:55:26,443 INFO L87 Difference]: Start difference. First operand 110 states and 111 transitions. Second operand has 85 states, 85 states have (on average 2.2941176470588234) internal successors, (195), 84 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) [2022-12-14 08:55:27,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:55:27,033 INFO L93 Difference]: Finished difference Result 195 states and 197 transitions. [2022-12-14 08:55:27,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2022-12-14 08:55:27,034 INFO L78 Accepts]: Start accepts. Automaton has has 85 states, 85 states have (on average 2.2941176470588234) internal successors, (195), 84 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) Word has length 109 [2022-12-14 08:55:27,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:55:27,034 INFO L225 Difference]: With dead ends: 195 [2022-12-14 08:55:27,034 INFO L226 Difference]: Without dead ends: 111 [2022-12-14 08:55:27,036 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 407 GetRequests, 239 SyntacticMatches, 53 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5113 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=2806, Invalid=10766, Unknown=0, NotChecked=0, Total=13572 [2022-12-14 08:55:27,036 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 7 mSDsluCounter, 345 mSDsCounter, 0 mSdLazyCounter, 739 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 373 SdHoareTripleChecker+Invalid, 739 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 739 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:55:27,036 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 373 Invalid, 739 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 739 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:55:27,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2022-12-14 08:55:27,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2022-12-14 08:55:27,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 110 states have (on average 1.018181818181818) internal successors, (112), 110 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:27,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 112 transitions. [2022-12-14 08:55:27,054 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 112 transitions. Word has length 109 [2022-12-14 08:55:27,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:55:27,054 INFO L495 AbstractCegarLoop]: Abstraction has 111 states and 112 transitions. [2022-12-14 08:55:27,054 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 85 states, 85 states have (on average 2.2941176470588234) internal successors, (195), 84 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) [2022-12-14 08:55:27,054 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 112 transitions. [2022-12-14 08:55:27,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2022-12-14 08:55:27,055 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:55:27,055 INFO L195 NwaCegarLoop]: trace histogram [27, 27, 26, 26, 1, 1, 1, 1] [2022-12-14 08:55:27,059 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Ended with exit code 0 [2022-12-14 08:55:27,255 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52,53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:55:27,256 INFO L420 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:55:27,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:55:27,257 INFO L85 PathProgramCache]: Analyzing trace with hash -259494513, now seen corresponding path program 52 times [2022-12-14 08:55:27,257 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:55:27,257 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1301366976] [2022-12-14 08:55:27,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:55:27,258 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:55:27,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:55:27,805 INFO L134 CoverageAnalysis]: Checked inductivity of 1405 backedges. 351 proven. 1054 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:27,805 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:55:27,805 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1301366976] [2022-12-14 08:55:27,806 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1301366976] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:55:27,806 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [403540449] [2022-12-14 08:55:27,806 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:55:27,806 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:55:27,806 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:55:27,806 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:55:27,807 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2022-12-14 08:55:27,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:55:27,865 INFO L263 TraceCheckSpWp]: Trace formula consists of 433 conjuncts, 60 conjunts are in the unsatisfiable core [2022-12-14 08:55:27,867 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:55:27,954 INFO L134 CoverageAnalysis]: Checked inductivity of 1405 backedges. 378 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:27,954 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:55:28,365 INFO L134 CoverageAnalysis]: Checked inductivity of 1405 backedges. 378 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:28,365 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [403540449] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:55:28,366 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1343731663] [2022-12-14 08:55:28,366 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:55:28,366 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:55:28,366 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:55:28,366 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:55:28,366 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:55:28,406 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:55:28,610 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '34947#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:55:28,610 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:55:28,610 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:55:28,610 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 32 [2022-12-14 08:55:28,610 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1270128962] [2022-12-14 08:55:28,610 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:55:28,610 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-12-14 08:55:28,610 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:55:28,611 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-12-14 08:55:28,611 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=464, Invalid=942, Unknown=0, NotChecked=0, Total=1406 [2022-12-14 08:55:28,611 INFO L87 Difference]: Start difference. First operand 111 states and 112 transitions. Second operand has 33 states, 33 states have (on average 3.4545454545454546) internal successors, (114), 32 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:28,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:55:28,986 INFO L93 Difference]: Finished difference Result 122 states and 123 transitions. [2022-12-14 08:55:28,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2022-12-14 08:55:28,986 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 3.4545454545454546) internal successors, (114), 32 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 110 [2022-12-14 08:55:28,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:55:28,987 INFO L225 Difference]: With dead ends: 122 [2022-12-14 08:55:28,987 INFO L226 Difference]: Without dead ends: 120 [2022-12-14 08:55:28,987 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 413 GetRequests, 294 SyntacticMatches, 54 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1950 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1395, Invalid=3027, Unknown=0, NotChecked=0, Total=4422 [2022-12-14 08:55:28,987 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 118 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 250 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 118 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 253 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 250 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:55:28,987 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [118 Valid, 13 Invalid, 253 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 250 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:55:28,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2022-12-14 08:55:29,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 114. [2022-12-14 08:55:29,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 113 states have (on average 1.0176991150442478) internal successors, (115), 113 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:29,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 115 transitions. [2022-12-14 08:55:29,005 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 115 transitions. Word has length 110 [2022-12-14 08:55:29,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:55:29,005 INFO L495 AbstractCegarLoop]: Abstraction has 114 states and 115 transitions. [2022-12-14 08:55:29,005 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 3.4545454545454546) internal successors, (114), 32 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:29,005 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 115 transitions. [2022-12-14 08:55:29,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2022-12-14 08:55:29,006 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:55:29,006 INFO L195 NwaCegarLoop]: trace histogram [28, 27, 27, 27, 1, 1, 1, 1] [2022-12-14 08:55:29,011 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Ended with exit code 0 [2022-12-14 08:55:29,206 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable53 [2022-12-14 08:55:29,207 INFO L420 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:55:29,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:55:29,208 INFO L85 PathProgramCache]: Analyzing trace with hash 344916298, now seen corresponding path program 53 times [2022-12-14 08:55:29,208 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:55:29,209 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1211810275] [2022-12-14 08:55:29,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:55:29,209 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:55:29,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:55:30,136 INFO L134 CoverageAnalysis]: Checked inductivity of 1485 backedges. 1028 proven. 457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:30,136 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:55:30,136 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1211810275] [2022-12-14 08:55:30,136 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1211810275] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:55:30,137 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1948283814] [2022-12-14 08:55:30,137 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:55:30,137 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:55:30,137 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:55:30,137 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:55:30,138 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2022-12-14 08:55:30,254 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2022-12-14 08:55:30,254 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:55:30,257 INFO L263 TraceCheckSpWp]: Trace formula consists of 443 conjuncts, 58 conjunts are in the unsatisfiable core [2022-12-14 08:55:30,259 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:55:31,076 INFO L134 CoverageAnalysis]: Checked inductivity of 1485 backedges. 1107 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:31,076 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:55:31,680 INFO L134 CoverageAnalysis]: Checked inductivity of 1485 backedges. 1107 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:31,680 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1948283814] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:55:31,680 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2112482102] [2022-12-14 08:55:31,681 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:55:31,681 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:55:31,681 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:55:31,681 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:55:31,681 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:55:31,728 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:55:32,078 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '36175#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:55:32,078 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:55:32,078 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:55:32,078 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 87 [2022-12-14 08:55:32,078 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [572109966] [2022-12-14 08:55:32,078 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:55:32,078 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 88 states [2022-12-14 08:55:32,078 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:55:32,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2022-12-14 08:55:32,079 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1759, Invalid=6797, Unknown=0, NotChecked=0, Total=8556 [2022-12-14 08:55:32,079 INFO L87 Difference]: Start difference. First operand 114 states and 115 transitions. Second operand has 88 states, 88 states have (on average 2.2954545454545454) internal successors, (202), 87 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) [2022-12-14 08:55:32,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:55:32,687 INFO L93 Difference]: Finished difference Result 202 states and 204 transitions. [2022-12-14 08:55:32,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2022-12-14 08:55:32,687 INFO L78 Accepts]: Start accepts. Automaton has has 88 states, 88 states have (on average 2.2954545454545454) internal successors, (202), 87 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 113 [2022-12-14 08:55:32,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:55:32,688 INFO L225 Difference]: With dead ends: 202 [2022-12-14 08:55:32,688 INFO L226 Difference]: Without dead ends: 115 [2022-12-14 08:55:32,689 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 422 GetRequests, 248 SyntacticMatches, 55 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5471 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=3007, Invalid=11513, Unknown=0, NotChecked=0, Total=14520 [2022-12-14 08:55:32,689 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 7 mSDsluCounter, 225 mSDsCounter, 0 mSdLazyCounter, 513 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 254 SdHoareTripleChecker+Invalid, 513 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 513 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:55:32,689 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 254 Invalid, 513 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 513 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:55:32,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2022-12-14 08:55:32,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2022-12-14 08:55:32,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 114 states have (on average 1.0175438596491229) internal successors, (116), 114 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:32,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 116 transitions. [2022-12-14 08:55:32,706 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 116 transitions. Word has length 113 [2022-12-14 08:55:32,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:55:32,706 INFO L495 AbstractCegarLoop]: Abstraction has 115 states and 116 transitions. [2022-12-14 08:55:32,706 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 88 states, 88 states have (on average 2.2954545454545454) internal successors, (202), 87 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) [2022-12-14 08:55:32,707 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 116 transitions. [2022-12-14 08:55:32,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2022-12-14 08:55:32,707 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:55:32,707 INFO L195 NwaCegarLoop]: trace histogram [28, 28, 27, 27, 1, 1, 1, 1] [2022-12-14 08:55:32,711 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Ended with exit code 0 [2022-12-14 08:55:32,907 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:55:32,908 INFO L420 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:55:32,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:55:32,909 INFO L85 PathProgramCache]: Analyzing trace with hash 407547845, now seen corresponding path program 54 times [2022-12-14 08:55:32,909 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:55:32,909 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [936385208] [2022-12-14 08:55:32,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:55:32,910 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:55:32,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:55:33,487 INFO L134 CoverageAnalysis]: Checked inductivity of 1513 backedges. 378 proven. 1135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:33,488 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:55:33,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [936385208] [2022-12-14 08:55:33,488 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [936385208] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:55:33,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [180041830] [2022-12-14 08:55:33,488 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:55:33,488 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:55:33,488 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:55:33,489 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:55:33,489 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2022-12-14 08:55:33,556 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:55:33,557 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:55:33,560 INFO L263 TraceCheckSpWp]: Trace formula consists of 448 conjuncts, 62 conjunts are in the unsatisfiable core [2022-12-14 08:55:33,561 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:55:33,664 INFO L134 CoverageAnalysis]: Checked inductivity of 1513 backedges. 406 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:33,664 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:55:34,181 INFO L134 CoverageAnalysis]: Checked inductivity of 1513 backedges. 406 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:34,181 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [180041830] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:55:34,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [8037514] [2022-12-14 08:55:34,182 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:55:34,182 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:55:34,182 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:55:34,182 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:55:34,182 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:55:34,225 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:55:34,411 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '37490#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:55:34,411 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:55:34,411 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:55:34,411 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 33 [2022-12-14 08:55:34,412 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [398632058] [2022-12-14 08:55:34,412 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:55:34,412 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-12-14 08:55:34,412 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:55:34,412 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-12-14 08:55:34,412 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=494, Invalid=988, Unknown=0, NotChecked=0, Total=1482 [2022-12-14 08:55:34,412 INFO L87 Difference]: Start difference. First operand 115 states and 116 transitions. Second operand has 34 states, 34 states have (on average 3.4705882352941178) internal successors, (118), 33 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) [2022-12-14 08:55:34,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:55:34,863 INFO L93 Difference]: Finished difference Result 126 states and 127 transitions. [2022-12-14 08:55:34,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2022-12-14 08:55:34,864 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 3.4705882352941178) internal successors, (118), 33 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 114 [2022-12-14 08:55:34,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:55:34,864 INFO L225 Difference]: With dead ends: 126 [2022-12-14 08:55:34,865 INFO L226 Difference]: Without dead ends: 124 [2022-12-14 08:55:34,865 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 428 GetRequests, 305 SyntacticMatches, 56 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2078 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1487, Invalid=3205, Unknown=0, NotChecked=0, Total=4692 [2022-12-14 08:55:34,865 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 66 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 336 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 339 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 336 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:55:34,866 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [66 Valid, 18 Invalid, 339 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 336 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:55:34,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2022-12-14 08:55:34,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 118. [2022-12-14 08:55:34,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 117 states have (on average 1.017094017094017) internal successors, (119), 117 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:34,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 119 transitions. [2022-12-14 08:55:34,888 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 119 transitions. Word has length 114 [2022-12-14 08:55:34,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:55:34,888 INFO L495 AbstractCegarLoop]: Abstraction has 118 states and 119 transitions. [2022-12-14 08:55:34,888 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 3.4705882352941178) internal successors, (118), 33 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) [2022-12-14 08:55:34,888 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 119 transitions. [2022-12-14 08:55:34,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2022-12-14 08:55:34,888 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:55:34,888 INFO L195 NwaCegarLoop]: trace histogram [29, 28, 28, 28, 1, 1, 1, 1] [2022-12-14 08:55:34,893 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Forceful destruction successful, exit code 0 [2022-12-14 08:55:35,089 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable55 [2022-12-14 08:55:35,090 INFO L420 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:55:35,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:55:35,090 INFO L85 PathProgramCache]: Analyzing trace with hash -609875116, now seen corresponding path program 55 times [2022-12-14 08:55:35,091 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:55:35,091 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [539161610] [2022-12-14 08:55:35,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:55:35,091 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:55:35,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:55:36,009 INFO L134 CoverageAnalysis]: Checked inductivity of 1596 backedges. 1108 proven. 488 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:36,009 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:55:36,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [539161610] [2022-12-14 08:55:36,009 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [539161610] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:55:36,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [551809289] [2022-12-14 08:55:36,009 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:55:36,009 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:55:36,009 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:55:36,010 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:55:36,011 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2022-12-14 08:55:36,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:55:36,072 INFO L263 TraceCheckSpWp]: Trace formula consists of 458 conjuncts, 60 conjunts are in the unsatisfiable core [2022-12-14 08:55:36,073 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:55:37,029 INFO L134 CoverageAnalysis]: Checked inductivity of 1596 backedges. 1190 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:37,029 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:55:37,906 INFO L134 CoverageAnalysis]: Checked inductivity of 1596 backedges. 1190 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:37,906 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [551809289] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:55:37,906 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1911886653] [2022-12-14 08:55:37,907 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:55:37,907 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:55:37,907 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:55:37,907 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:55:37,907 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:55:37,960 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:55:38,344 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '38761#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:55:38,344 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:55:38,344 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:55:38,344 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 90 [2022-12-14 08:55:38,344 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1612944741] [2022-12-14 08:55:38,344 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:55:38,345 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 91 states [2022-12-14 08:55:38,345 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:55:38,346 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2022-12-14 08:55:38,346 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1879, Invalid=7241, Unknown=0, NotChecked=0, Total=9120 [2022-12-14 08:55:38,346 INFO L87 Difference]: Start difference. First operand 118 states and 119 transitions. Second operand has 91 states, 91 states have (on average 2.2967032967032965) internal successors, (209), 90 states have internal predecessors, (209), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:39,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:55:39,098 INFO L93 Difference]: Finished difference Result 209 states and 211 transitions. [2022-12-14 08:55:39,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2022-12-14 08:55:39,099 INFO L78 Accepts]: Start accepts. Automaton has has 91 states, 91 states have (on average 2.2967032967032965) internal successors, (209), 90 states have internal predecessors, (209), 0 states have call successors, (0), 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 117 [2022-12-14 08:55:39,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:55:39,099 INFO L225 Difference]: With dead ends: 209 [2022-12-14 08:55:39,099 INFO L226 Difference]: Without dead ends: 119 [2022-12-14 08:55:39,100 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 437 GetRequests, 257 SyntacticMatches, 57 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5841 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=3215, Invalid=12285, Unknown=0, NotChecked=0, Total=15500 [2022-12-14 08:55:39,100 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 7 mSDsluCounter, 229 mSDsCounter, 0 mSdLazyCounter, 521 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 259 SdHoareTripleChecker+Invalid, 521 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 521 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:55:39,100 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 259 Invalid, 521 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 521 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:55:39,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2022-12-14 08:55:39,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 119. [2022-12-14 08:55:39,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 118 states have (on average 1.0169491525423728) internal successors, (120), 118 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:39,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 120 transitions. [2022-12-14 08:55:39,119 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 120 transitions. Word has length 117 [2022-12-14 08:55:39,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:55:39,119 INFO L495 AbstractCegarLoop]: Abstraction has 119 states and 120 transitions. [2022-12-14 08:55:39,119 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 91 states, 91 states have (on average 2.2967032967032965) internal successors, (209), 90 states have internal predecessors, (209), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:39,119 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 120 transitions. [2022-12-14 08:55:39,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2022-12-14 08:55:39,119 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:55:39,119 INFO L195 NwaCegarLoop]: trace histogram [29, 29, 28, 28, 1, 1, 1, 1] [2022-12-14 08:55:39,124 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Forceful destruction successful, exit code 0 [2022-12-14 08:55:39,320 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56,57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:55:39,320 INFO L420 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:55:39,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:55:39,320 INFO L85 PathProgramCache]: Analyzing trace with hash 614466639, now seen corresponding path program 56 times [2022-12-14 08:55:39,320 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:55:39,320 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [617221099] [2022-12-14 08:55:39,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:55:39,321 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:55:39,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:55:39,943 INFO L134 CoverageAnalysis]: Checked inductivity of 1625 backedges. 406 proven. 1219 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:39,944 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:55:39,944 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [617221099] [2022-12-14 08:55:39,944 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [617221099] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:55:39,944 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [77427233] [2022-12-14 08:55:39,944 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:55:39,944 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:55:39,944 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:55:39,945 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:55:39,945 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2022-12-14 08:55:40,081 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 29 check-sat command(s) [2022-12-14 08:55:40,081 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:55:40,084 INFO L263 TraceCheckSpWp]: Trace formula consists of 463 conjuncts, 64 conjunts are in the unsatisfiable core [2022-12-14 08:55:40,085 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:55:40,180 INFO L134 CoverageAnalysis]: Checked inductivity of 1625 backedges. 435 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:40,180 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:55:40,627 INFO L134 CoverageAnalysis]: Checked inductivity of 1625 backedges. 435 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:40,627 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [77427233] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:55:40,627 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1398065433] [2022-12-14 08:55:40,628 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:55:40,628 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:55:40,628 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:55:40,628 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:55:40,628 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:55:40,680 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:55:40,848 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '40122#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:55:40,848 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:55:40,848 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:55:40,848 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 34 [2022-12-14 08:55:40,848 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [370253257] [2022-12-14 08:55:40,848 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:55:40,848 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-12-14 08:55:40,848 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:55:40,849 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-12-14 08:55:40,849 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=525, Invalid=1035, Unknown=0, NotChecked=0, Total=1560 [2022-12-14 08:55:40,849 INFO L87 Difference]: Start difference. First operand 119 states and 120 transitions. Second operand has 35 states, 35 states have (on average 3.4857142857142858) internal successors, (122), 34 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) [2022-12-14 08:55:41,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:55:41,262 INFO L93 Difference]: Finished difference Result 130 states and 131 transitions. [2022-12-14 08:55:41,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2022-12-14 08:55:41,263 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 3.4857142857142858) internal successors, (122), 34 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) Word has length 118 [2022-12-14 08:55:41,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:55:41,264 INFO L225 Difference]: With dead ends: 130 [2022-12-14 08:55:41,264 INFO L226 Difference]: Without dead ends: 128 [2022-12-14 08:55:41,264 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 443 GetRequests, 316 SyntacticMatches, 58 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2210 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1582, Invalid=3388, Unknown=0, NotChecked=0, Total=4970 [2022-12-14 08:55:41,264 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 124 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 286 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 124 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 289 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 286 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:55:41,264 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [124 Valid, 19 Invalid, 289 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 286 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:55:41,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2022-12-14 08:55:41,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 122. [2022-12-14 08:55:41,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 121 states have (on average 1.0165289256198347) internal successors, (123), 121 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) [2022-12-14 08:55:41,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 123 transitions. [2022-12-14 08:55:41,284 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 123 transitions. Word has length 118 [2022-12-14 08:55:41,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:55:41,284 INFO L495 AbstractCegarLoop]: Abstraction has 122 states and 123 transitions. [2022-12-14 08:55:41,284 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 3.4857142857142858) internal successors, (122), 34 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) [2022-12-14 08:55:41,284 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 123 transitions. [2022-12-14 08:55:41,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2022-12-14 08:55:41,284 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:55:41,284 INFO L195 NwaCegarLoop]: trace histogram [30, 29, 29, 29, 1, 1, 1, 1] [2022-12-14 08:55:41,289 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Ended with exit code 0 [2022-12-14 08:55:41,485 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57,58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:55:41,486 INFO L420 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:55:41,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:55:41,486 INFO L85 PathProgramCache]: Analyzing trace with hash 429847178, now seen corresponding path program 57 times [2022-12-14 08:55:41,487 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:55:41,487 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1492619336] [2022-12-14 08:55:41,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:55:41,487 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:55:41,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:55:42,661 INFO L134 CoverageAnalysis]: Checked inductivity of 1711 backedges. 1191 proven. 520 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:42,662 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:55:42,662 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1492619336] [2022-12-14 08:55:42,662 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1492619336] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:55:42,662 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1679258117] [2022-12-14 08:55:42,662 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:55:42,662 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:55:42,662 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:55:42,663 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:55:42,663 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2022-12-14 08:55:42,735 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:55:42,735 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:55:42,738 INFO L263 TraceCheckSpWp]: Trace formula consists of 473 conjuncts, 62 conjunts are in the unsatisfiable core [2022-12-14 08:55:42,739 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:55:43,817 INFO L134 CoverageAnalysis]: Checked inductivity of 1711 backedges. 1276 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:43,818 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:55:44,707 INFO L134 CoverageAnalysis]: Checked inductivity of 1711 backedges. 1276 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:44,707 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1679258117] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:55:44,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [376334209] [2022-12-14 08:55:44,708 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:55:44,708 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:55:44,708 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:55:44,708 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:55:44,708 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:55:44,752 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:55:45,091 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '41436#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:55:45,091 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:55:45,091 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:55:45,091 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 93 [2022-12-14 08:55:45,091 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [260981938] [2022-12-14 08:55:45,091 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:55:45,091 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 94 states [2022-12-14 08:55:45,092 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:55:45,092 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2022-12-14 08:55:45,092 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2003, Invalid=7699, Unknown=0, NotChecked=0, Total=9702 [2022-12-14 08:55:45,093 INFO L87 Difference]: Start difference. First operand 122 states and 123 transitions. Second operand has 94 states, 94 states have (on average 2.297872340425532) internal successors, (216), 93 states have internal predecessors, (216), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:45,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:55:45,759 INFO L93 Difference]: Finished difference Result 216 states and 218 transitions. [2022-12-14 08:55:45,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2022-12-14 08:55:45,759 INFO L78 Accepts]: Start accepts. Automaton has has 94 states, 94 states have (on average 2.297872340425532) internal successors, (216), 93 states have internal predecessors, (216), 0 states have call successors, (0), 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 121 [2022-12-14 08:55:45,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:55:45,760 INFO L225 Difference]: With dead ends: 216 [2022-12-14 08:55:45,760 INFO L226 Difference]: Without dead ends: 123 [2022-12-14 08:55:45,761 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 452 GetRequests, 266 SyntacticMatches, 59 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6223 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=3430, Invalid=13082, Unknown=0, NotChecked=0, Total=16512 [2022-12-14 08:55:45,761 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 7 mSDsluCounter, 307 mSDsCounter, 0 mSdLazyCounter, 670 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 338 SdHoareTripleChecker+Invalid, 670 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 670 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:55:45,761 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 338 Invalid, 670 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 670 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:55:45,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2022-12-14 08:55:45,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 123. [2022-12-14 08:55:45,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 122 states have (on average 1.0163934426229508) internal successors, (124), 122 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) [2022-12-14 08:55:45,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 124 transitions. [2022-12-14 08:55:45,791 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 124 transitions. Word has length 121 [2022-12-14 08:55:45,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:55:45,791 INFO L495 AbstractCegarLoop]: Abstraction has 123 states and 124 transitions. [2022-12-14 08:55:45,792 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 94 states, 94 states have (on average 2.297872340425532) internal successors, (216), 93 states have internal predecessors, (216), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:45,792 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 124 transitions. [2022-12-14 08:55:45,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2022-12-14 08:55:45,792 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:55:45,792 INFO L195 NwaCegarLoop]: trace histogram [30, 30, 29, 29, 1, 1, 1, 1] [2022-12-14 08:55:45,796 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Ended with exit code 0 [2022-12-14 08:55:45,992 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2022-12-14 08:55:45,993 INFO L420 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:55:45,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:55:45,994 INFO L85 PathProgramCache]: Analyzing trace with hash -223480315, now seen corresponding path program 58 times [2022-12-14 08:55:45,994 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:55:45,994 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [217129635] [2022-12-14 08:55:45,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:55:45,995 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:55:46,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:55:46,728 INFO L134 CoverageAnalysis]: Checked inductivity of 1741 backedges. 435 proven. 1306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:46,728 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:55:46,728 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [217129635] [2022-12-14 08:55:46,728 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [217129635] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:55:46,728 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1965277102] [2022-12-14 08:55:46,728 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:55:46,728 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:55:46,729 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:55:46,729 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:55:46,730 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2022-12-14 08:55:46,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:55:46,790 INFO L263 TraceCheckSpWp]: Trace formula consists of 478 conjuncts, 66 conjunts are in the unsatisfiable core [2022-12-14 08:55:46,791 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:55:46,906 INFO L134 CoverageAnalysis]: Checked inductivity of 1741 backedges. 465 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:46,906 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:55:47,609 INFO L134 CoverageAnalysis]: Checked inductivity of 1741 backedges. 465 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:47,610 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1965277102] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:55:47,610 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [422084006] [2022-12-14 08:55:47,610 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:55:47,611 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:55:47,611 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:55:47,611 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:55:47,611 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:55:47,654 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:55:47,863 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '42843#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:55:47,864 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:55:47,864 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:55:47,864 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 35 [2022-12-14 08:55:47,864 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [939721859] [2022-12-14 08:55:47,864 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:55:47,864 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-12-14 08:55:47,865 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:55:47,865 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-12-14 08:55:47,865 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=557, Invalid=1083, Unknown=0, NotChecked=0, Total=1640 [2022-12-14 08:55:47,865 INFO L87 Difference]: Start difference. First operand 123 states and 124 transitions. Second operand has 36 states, 36 states have (on average 3.5) internal successors, (126), 35 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:48,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:55:48,376 INFO L93 Difference]: Finished difference Result 134 states and 135 transitions. [2022-12-14 08:55:48,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2022-12-14 08:55:48,377 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 3.5) internal successors, (126), 35 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 122 [2022-12-14 08:55:48,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:55:48,378 INFO L225 Difference]: With dead ends: 134 [2022-12-14 08:55:48,378 INFO L226 Difference]: Without dead ends: 132 [2022-12-14 08:55:48,378 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 458 GetRequests, 327 SyntacticMatches, 60 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2346 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1680, Invalid=3576, Unknown=0, NotChecked=0, Total=5256 [2022-12-14 08:55:48,378 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 128 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 285 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 128 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 288 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 285 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:55:48,378 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [128 Valid, 17 Invalid, 288 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 285 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:55:48,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2022-12-14 08:55:48,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 126. [2022-12-14 08:55:48,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 125 states have (on average 1.016) internal successors, (127), 125 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:48,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 127 transitions. [2022-12-14 08:55:48,401 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 127 transitions. Word has length 122 [2022-12-14 08:55:48,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:55:48,401 INFO L495 AbstractCegarLoop]: Abstraction has 126 states and 127 transitions. [2022-12-14 08:55:48,401 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 3.5) internal successors, (126), 35 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:48,401 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 127 transitions. [2022-12-14 08:55:48,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2022-12-14 08:55:48,402 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:55:48,402 INFO L195 NwaCegarLoop]: trace histogram [31, 30, 30, 30, 1, 1, 1, 1] [2022-12-14 08:55:48,406 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Ended with exit code 0 [2022-12-14 08:55:48,602 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2022-12-14 08:55:48,603 INFO L420 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:55:48,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:55:48,604 INFO L85 PathProgramCache]: Analyzing trace with hash -497935084, now seen corresponding path program 59 times [2022-12-14 08:55:48,604 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:55:48,604 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1147359448] [2022-12-14 08:55:48,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:55:48,605 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:55:48,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:55:49,843 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 1277 proven. 553 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:49,844 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:55:49,844 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1147359448] [2022-12-14 08:55:49,844 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1147359448] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:55:49,844 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1700986463] [2022-12-14 08:55:49,844 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:55:49,844 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:55:49,844 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:55:49,845 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:55:49,846 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Waiting until timeout for monitored process [2022-12-14 08:55:49,949 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 31 check-sat command(s) [2022-12-14 08:55:49,949 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:55:49,952 INFO L263 TraceCheckSpWp]: Trace formula consists of 488 conjuncts, 64 conjunts are in the unsatisfiable core [2022-12-14 08:55:49,955 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:55:51,123 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 1365 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:51,123 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:55:52,024 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 1365 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:52,024 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1700986463] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:55:52,024 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [281639804] [2022-12-14 08:55:52,025 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:55:52,025 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:55:52,025 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:55:52,025 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:55:52,025 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:55:52,084 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:55:52,568 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '44200#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:55:52,568 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:55:52,568 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:55:52,568 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 96 [2022-12-14 08:55:52,569 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [374807555] [2022-12-14 08:55:52,569 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:55:52,569 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2022-12-14 08:55:52,569 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:55:52,570 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2022-12-14 08:55:52,571 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2131, Invalid=8171, Unknown=0, NotChecked=0, Total=10302 [2022-12-14 08:55:52,571 INFO L87 Difference]: Start difference. First operand 126 states and 127 transitions. Second operand has 97 states, 97 states have (on average 2.2989690721649483) internal successors, (223), 96 states have internal predecessors, (223), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:53,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:55:53,685 INFO L93 Difference]: Finished difference Result 223 states and 225 transitions. [2022-12-14 08:55:53,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2022-12-14 08:55:53,686 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 2.2989690721649483) internal successors, (223), 96 states have internal predecessors, (223), 0 states have call successors, (0), 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 125 [2022-12-14 08:55:53,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:55:53,687 INFO L225 Difference]: With dead ends: 223 [2022-12-14 08:55:53,687 INFO L226 Difference]: Without dead ends: 127 [2022-12-14 08:55:53,688 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 467 GetRequests, 275 SyntacticMatches, 61 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6617 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=3652, Invalid=13904, Unknown=0, NotChecked=0, Total=17556 [2022-12-14 08:55:53,688 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 7 mSDsluCounter, 297 mSDsCounter, 0 mSdLazyCounter, 663 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 329 SdHoareTripleChecker+Invalid, 663 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 663 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 08:55:53,688 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 329 Invalid, 663 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 663 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 08:55:53,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2022-12-14 08:55:53,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2022-12-14 08:55:53,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 126 states have (on average 1.0158730158730158) internal successors, (128), 126 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:53,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 128 transitions. [2022-12-14 08:55:53,720 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 128 transitions. Word has length 125 [2022-12-14 08:55:53,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:55:53,720 INFO L495 AbstractCegarLoop]: Abstraction has 127 states and 128 transitions. [2022-12-14 08:55:53,720 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 97 states have (on average 2.2989690721649483) internal successors, (223), 96 states have internal predecessors, (223), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:53,720 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 128 transitions. [2022-12-14 08:55:53,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2022-12-14 08:55:53,721 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:55:53,721 INFO L195 NwaCegarLoop]: trace histogram [31, 31, 30, 30, 1, 1, 1, 1] [2022-12-14 08:55:53,725 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Ended with exit code 0 [2022-12-14 08:55:53,921 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:55:53,922 INFO L420 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:55:53,922 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:55:53,923 INFO L85 PathProgramCache]: Analyzing trace with hash -856888561, now seen corresponding path program 60 times [2022-12-14 08:55:53,923 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:55:53,923 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1804205226] [2022-12-14 08:55:53,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:55:53,924 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:55:53,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:55:54,652 INFO L134 CoverageAnalysis]: Checked inductivity of 1861 backedges. 465 proven. 1396 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:54,652 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:55:54,652 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1804205226] [2022-12-14 08:55:54,652 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1804205226] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:55:54,652 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1373737266] [2022-12-14 08:55:54,652 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:55:54,652 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:55:54,653 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:55:54,653 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:55:54,654 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2022-12-14 08:55:54,724 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:55:54,724 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:55:54,727 INFO L263 TraceCheckSpWp]: Trace formula consists of 493 conjuncts, 68 conjunts are in the unsatisfiable core [2022-12-14 08:55:54,729 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:55:54,863 INFO L134 CoverageAnalysis]: Checked inductivity of 1861 backedges. 496 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:54,863 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:55:55,582 INFO L134 CoverageAnalysis]: Checked inductivity of 1861 backedges. 496 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:55,583 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1373737266] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:55:55,583 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [632475644] [2022-12-14 08:55:55,584 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:55:55,584 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:55:55,584 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:55:55,584 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:55:55,584 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:55:55,635 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:55:55,846 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '45653#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:55:55,846 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:55:55,846 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:55:55,846 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 36 [2022-12-14 08:55:55,847 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1597186597] [2022-12-14 08:55:55,847 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:55:55,847 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-12-14 08:55:55,847 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:55:55,848 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-12-14 08:55:55,848 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=590, Invalid=1132, Unknown=0, NotChecked=0, Total=1722 [2022-12-14 08:55:55,848 INFO L87 Difference]: Start difference. First operand 127 states and 128 transitions. Second operand has 37 states, 37 states have (on average 3.5135135135135136) internal successors, (130), 36 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) [2022-12-14 08:55:56,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:55:56,323 INFO L93 Difference]: Finished difference Result 138 states and 139 transitions. [2022-12-14 08:55:56,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2022-12-14 08:55:56,323 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 3.5135135135135136) internal successors, (130), 36 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 126 [2022-12-14 08:55:56,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:55:56,324 INFO L225 Difference]: With dead ends: 138 [2022-12-14 08:55:56,324 INFO L226 Difference]: Without dead ends: 136 [2022-12-14 08:55:56,325 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 473 GetRequests, 338 SyntacticMatches, 62 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2486 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1781, Invalid=3769, Unknown=0, NotChecked=0, Total=5550 [2022-12-14 08:55:56,325 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 72 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 337 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 340 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 337 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:55:56,325 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [72 Valid, 14 Invalid, 340 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 337 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:55:56,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2022-12-14 08:55:56,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 130. [2022-12-14 08:55:56,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 129 states have (on average 1.0155038759689923) internal successors, (131), 129 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:56,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 131 transitions. [2022-12-14 08:55:56,348 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 131 transitions. Word has length 126 [2022-12-14 08:55:56,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:55:56,348 INFO L495 AbstractCegarLoop]: Abstraction has 130 states and 131 transitions. [2022-12-14 08:55:56,348 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 3.5135135135135136) internal successors, (130), 36 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) [2022-12-14 08:55:56,348 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 131 transitions. [2022-12-14 08:55:56,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2022-12-14 08:55:56,349 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:55:56,349 INFO L195 NwaCegarLoop]: trace histogram [32, 31, 31, 31, 1, 1, 1, 1] [2022-12-14 08:55:56,353 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Ended with exit code 0 [2022-12-14 08:55:56,549 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:55:56,550 INFO L420 AbstractCegarLoop]: === Iteration 63 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:55:56,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:55:56,551 INFO L85 PathProgramCache]: Analyzing trace with hash 1723306954, now seen corresponding path program 61 times [2022-12-14 08:55:56,551 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:55:56,551 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1907381178] [2022-12-14 08:55:56,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:55:56,552 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:55:56,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:55:57,932 INFO L134 CoverageAnalysis]: Checked inductivity of 1953 backedges. 1366 proven. 587 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:57,932 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:55:57,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1907381178] [2022-12-14 08:55:57,932 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1907381178] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:55:57,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1860170441] [2022-12-14 08:55:57,932 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:55:57,932 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:55:57,933 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:55:57,933 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:55:57,934 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Waiting until timeout for monitored process [2022-12-14 08:55:58,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:55:58,013 INFO L263 TraceCheckSpWp]: Trace formula consists of 503 conjuncts, 66 conjunts are in the unsatisfiable core [2022-12-14 08:55:58,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:55:59,625 INFO L134 CoverageAnalysis]: Checked inductivity of 1953 backedges. 1457 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:59,626 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:56:00,801 INFO L134 CoverageAnalysis]: Checked inductivity of 1953 backedges. 1457 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:00,802 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1860170441] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:56:00,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [655325078] [2022-12-14 08:56:00,803 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:56:00,803 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:56:00,803 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:56:00,803 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:56:00,803 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:56:00,850 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:56:01,282 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '47053#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:56:01,282 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:56:01,282 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:56:01,282 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 99 [2022-12-14 08:56:01,282 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [900171815] [2022-12-14 08:56:01,282 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:56:01,283 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 100 states [2022-12-14 08:56:01,283 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:56:01,284 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2022-12-14 08:56:01,284 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2263, Invalid=8657, Unknown=0, NotChecked=0, Total=10920 [2022-12-14 08:56:01,284 INFO L87 Difference]: Start difference. First operand 130 states and 131 transitions. Second operand has 100 states, 100 states have (on average 2.3) internal successors, (230), 99 states have internal predecessors, (230), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:56:02,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:56:02,069 INFO L93 Difference]: Finished difference Result 230 states and 232 transitions. [2022-12-14 08:56:02,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2022-12-14 08:56:02,069 INFO L78 Accepts]: Start accepts. Automaton has has 100 states, 100 states have (on average 2.3) internal successors, (230), 99 states have internal predecessors, (230), 0 states have call successors, (0), 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 129 [2022-12-14 08:56:02,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:56:02,070 INFO L225 Difference]: With dead ends: 230 [2022-12-14 08:56:02,070 INFO L226 Difference]: Without dead ends: 131 [2022-12-14 08:56:02,071 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 482 GetRequests, 284 SyntacticMatches, 63 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7023 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=3881, Invalid=14751, Unknown=0, NotChecked=0, Total=18632 [2022-12-14 08:56:02,071 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 7 mSDsluCounter, 342 mSDsCounter, 0 mSdLazyCounter, 746 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 375 SdHoareTripleChecker+Invalid, 746 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 746 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:56:02,071 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 375 Invalid, 746 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 746 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:56:02,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2022-12-14 08:56:02,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 131. [2022-12-14 08:56:02,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 130 states have (on average 1.0153846153846153) internal successors, (132), 130 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:56:02,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 132 transitions. [2022-12-14 08:56:02,093 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 132 transitions. Word has length 129 [2022-12-14 08:56:02,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:56:02,093 INFO L495 AbstractCegarLoop]: Abstraction has 131 states and 132 transitions. [2022-12-14 08:56:02,093 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 100 states, 100 states have (on average 2.3) internal successors, (230), 99 states have internal predecessors, (230), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:56:02,093 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 132 transitions. [2022-12-14 08:56:02,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2022-12-14 08:56:02,093 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:56:02,094 INFO L195 NwaCegarLoop]: trace histogram [32, 32, 31, 31, 1, 1, 1, 1] [2022-12-14 08:56:02,097 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Ended with exit code 0 [2022-12-14 08:56:02,294 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62,63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:56:02,295 INFO L420 AbstractCegarLoop]: === Iteration 64 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:56:02,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:56:02,296 INFO L85 PathProgramCache]: Analyzing trace with hash -889918395, now seen corresponding path program 62 times [2022-12-14 08:56:02,296 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:56:02,296 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2040262185] [2022-12-14 08:56:02,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:56:02,297 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:56:02,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:56:03,087 INFO L134 CoverageAnalysis]: Checked inductivity of 1985 backedges. 496 proven. 1489 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:03,087 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:56:03,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2040262185] [2022-12-14 08:56:03,087 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2040262185] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:56:03,088 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [682264076] [2022-12-14 08:56:03,088 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:56:03,088 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:56:03,088 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:56:03,089 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:56:03,089 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Waiting until timeout for monitored process [2022-12-14 08:56:03,206 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2022-12-14 08:56:03,206 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:56:03,208 INFO L263 TraceCheckSpWp]: Trace formula consists of 508 conjuncts, 70 conjunts are in the unsatisfiable core [2022-12-14 08:56:03,210 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:56:03,325 INFO L134 CoverageAnalysis]: Checked inductivity of 1985 backedges. 528 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:03,325 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:56:04,097 INFO L134 CoverageAnalysis]: Checked inductivity of 1985 backedges. 528 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:04,097 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [682264076] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:56:04,098 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [688154635] [2022-12-14 08:56:04,098 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:56:04,098 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:56:04,099 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:56:04,099 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:56:04,099 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:56:04,142 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:56:04,351 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '48552#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:56:04,351 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:56:04,351 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:56:04,351 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 37 [2022-12-14 08:56:04,351 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [187242151] [2022-12-14 08:56:04,351 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:56:04,352 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-12-14 08:56:04,352 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:56:04,352 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-12-14 08:56:04,353 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=624, Invalid=1182, Unknown=0, NotChecked=0, Total=1806 [2022-12-14 08:56:04,353 INFO L87 Difference]: Start difference. First operand 131 states and 132 transitions. Second operand has 38 states, 38 states have (on average 3.526315789473684) internal successors, (134), 37 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) [2022-12-14 08:56:04,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:56:04,905 INFO L93 Difference]: Finished difference Result 142 states and 143 transitions. [2022-12-14 08:56:04,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2022-12-14 08:56:04,905 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 3.526315789473684) internal successors, (134), 37 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) Word has length 130 [2022-12-14 08:56:04,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:56:04,906 INFO L225 Difference]: With dead ends: 142 [2022-12-14 08:56:04,906 INFO L226 Difference]: Without dead ends: 140 [2022-12-14 08:56:04,907 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 488 GetRequests, 349 SyntacticMatches, 64 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2630 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1885, Invalid=3967, Unknown=0, NotChecked=0, Total=5852 [2022-12-14 08:56:04,907 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 136 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 333 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 136 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 336 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 333 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:56:04,907 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [136 Valid, 15 Invalid, 336 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 333 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:56:04,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2022-12-14 08:56:04,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 134. [2022-12-14 08:56:04,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 133 states have (on average 1.0150375939849625) internal successors, (135), 133 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) [2022-12-14 08:56:04,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 135 transitions. [2022-12-14 08:56:04,938 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 135 transitions. Word has length 130 [2022-12-14 08:56:04,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:56:04,938 INFO L495 AbstractCegarLoop]: Abstraction has 134 states and 135 transitions. [2022-12-14 08:56:04,938 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 3.526315789473684) internal successors, (134), 37 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) [2022-12-14 08:56:04,938 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 135 transitions. [2022-12-14 08:56:04,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2022-12-14 08:56:04,938 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:56:04,938 INFO L195 NwaCegarLoop]: trace histogram [33, 32, 32, 32, 1, 1, 1, 1] [2022-12-14 08:56:04,943 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Ended with exit code 0 [2022-12-14 08:56:05,139 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63,64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:56:05,140 INFO L420 AbstractCegarLoop]: === Iteration 65 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:56:05,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:56:05,141 INFO L85 PathProgramCache]: Analyzing trace with hash 1279033044, now seen corresponding path program 63 times [2022-12-14 08:56:05,141 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:56:05,141 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1416564495] [2022-12-14 08:56:05,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:56:05,142 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:56:05,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:56:06,377 INFO L134 CoverageAnalysis]: Checked inductivity of 2080 backedges. 1458 proven. 622 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:06,377 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:56:06,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1416564495] [2022-12-14 08:56:06,377 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1416564495] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:56:06,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2063801865] [2022-12-14 08:56:06,378 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:56:06,378 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:56:06,378 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:56:06,379 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:56:06,379 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Waiting until timeout for monitored process [2022-12-14 08:56:06,448 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:56:06,448 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:56:06,451 INFO L263 TraceCheckSpWp]: Trace formula consists of 518 conjuncts, 68 conjunts are in the unsatisfiable core [2022-12-14 08:56:06,453 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:56:07,696 INFO L134 CoverageAnalysis]: Checked inductivity of 2080 backedges. 1552 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:07,697 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:56:08,559 INFO L134 CoverageAnalysis]: Checked inductivity of 2080 backedges. 1552 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:08,559 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2063801865] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:56:08,559 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1410971905] [2022-12-14 08:56:08,560 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:56:08,560 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:56:08,560 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:56:08,561 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:56:08,561 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:56:08,605 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:56:08,935 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '49995#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:56:08,936 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:56:08,936 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:56:08,936 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 102 [2022-12-14 08:56:08,936 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1123595120] [2022-12-14 08:56:08,936 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:56:08,937 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 103 states [2022-12-14 08:56:08,937 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:56:08,938 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2022-12-14 08:56:08,938 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2399, Invalid=9157, Unknown=0, NotChecked=0, Total=11556 [2022-12-14 08:56:08,938 INFO L87 Difference]: Start difference. First operand 134 states and 135 transitions. Second operand has 103 states, 103 states have (on average 2.3009708737864076) internal successors, (237), 102 states have internal predecessors, (237), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:56:09,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:56:09,806 INFO L93 Difference]: Finished difference Result 237 states and 239 transitions. [2022-12-14 08:56:09,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2022-12-14 08:56:09,806 INFO L78 Accepts]: Start accepts. Automaton has has 103 states, 103 states have (on average 2.3009708737864076) internal successors, (237), 102 states have internal predecessors, (237), 0 states have call successors, (0), 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 133 [2022-12-14 08:56:09,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:56:09,807 INFO L225 Difference]: With dead ends: 237 [2022-12-14 08:56:09,807 INFO L226 Difference]: Without dead ends: 135 [2022-12-14 08:56:09,808 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 497 GetRequests, 293 SyntacticMatches, 65 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7441 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=4117, Invalid=15623, Unknown=0, NotChecked=0, Total=19740 [2022-12-14 08:56:09,809 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 7 mSDsluCounter, 346 mSDsCounter, 0 mSdLazyCounter, 765 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 380 SdHoareTripleChecker+Invalid, 765 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 765 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:56:09,809 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 380 Invalid, 765 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 765 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:56:09,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2022-12-14 08:56:09,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 135. [2022-12-14 08:56:09,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 134 states have (on average 1.0149253731343284) internal successors, (136), 134 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:56:09,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 136 transitions. [2022-12-14 08:56:09,843 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 136 transitions. Word has length 133 [2022-12-14 08:56:09,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:56:09,843 INFO L495 AbstractCegarLoop]: Abstraction has 135 states and 136 transitions. [2022-12-14 08:56:09,843 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 103 states, 103 states have (on average 2.3009708737864076) internal successors, (237), 102 states have internal predecessors, (237), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:56:09,843 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 136 transitions. [2022-12-14 08:56:09,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2022-12-14 08:56:09,844 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:56:09,844 INFO L195 NwaCegarLoop]: trace histogram [33, 33, 32, 32, 1, 1, 1, 1] [2022-12-14 08:56:09,848 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Ended with exit code 0 [2022-12-14 08:56:10,044 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable64 [2022-12-14 08:56:10,045 INFO L420 AbstractCegarLoop]: === Iteration 66 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:56:10,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:56:10,046 INFO L85 PathProgramCache]: Analyzing trace with hash 684925391, now seen corresponding path program 64 times [2022-12-14 08:56:10,046 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:56:10,046 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1952023120] [2022-12-14 08:56:10,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:56:10,047 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:56:10,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:56:10,816 INFO L134 CoverageAnalysis]: Checked inductivity of 2113 backedges. 528 proven. 1585 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:10,816 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:56:10,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1952023120] [2022-12-14 08:56:10,816 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1952023120] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:56:10,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [663543373] [2022-12-14 08:56:10,817 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:56:10,817 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:56:10,817 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:56:10,817 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:56:10,818 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Waiting until timeout for monitored process [2022-12-14 08:56:10,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:56:10,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 523 conjuncts, 72 conjunts are in the unsatisfiable core [2022-12-14 08:56:10,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:56:10,986 INFO L134 CoverageAnalysis]: Checked inductivity of 2113 backedges. 561 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:10,986 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:56:11,596 INFO L134 CoverageAnalysis]: Checked inductivity of 2113 backedges. 561 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:11,596 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [663543373] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:56:11,597 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1172598861] [2022-12-14 08:56:11,597 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:56:11,597 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:56:11,598 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:56:11,598 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:56:11,598 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:56:11,644 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:56:11,829 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '51540#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:56:11,829 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:56:11,829 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:56:11,829 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 38 [2022-12-14 08:56:11,829 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1826568043] [2022-12-14 08:56:11,829 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:56:11,830 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-12-14 08:56:11,830 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:56:11,830 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-12-14 08:56:11,831 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=659, Invalid=1233, Unknown=0, NotChecked=0, Total=1892 [2022-12-14 08:56:11,831 INFO L87 Difference]: Start difference. First operand 135 states and 136 transitions. Second operand has 39 states, 39 states have (on average 3.5384615384615383) internal successors, (138), 38 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:56:12,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:56:12,233 INFO L93 Difference]: Finished difference Result 146 states and 147 transitions. [2022-12-14 08:56:12,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2022-12-14 08:56:12,233 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 3.5384615384615383) internal successors, (138), 38 states have internal predecessors, (138), 0 states have call successors, (0), 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 134 [2022-12-14 08:56:12,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:56:12,233 INFO L225 Difference]: With dead ends: 146 [2022-12-14 08:56:12,234 INFO L226 Difference]: Without dead ends: 144 [2022-12-14 08:56:12,234 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 503 GetRequests, 360 SyntacticMatches, 66 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2778 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1992, Invalid=4170, Unknown=0, NotChecked=0, Total=6162 [2022-12-14 08:56:12,234 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 142 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 311 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 142 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 314 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 311 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:56:12,234 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [142 Valid, 15 Invalid, 314 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 311 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:56:12,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2022-12-14 08:56:12,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 138. [2022-12-14 08:56:12,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 137 states have (on average 1.0145985401459854) internal successors, (139), 137 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:56:12,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 139 transitions. [2022-12-14 08:56:12,259 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 139 transitions. Word has length 134 [2022-12-14 08:56:12,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:56:12,259 INFO L495 AbstractCegarLoop]: Abstraction has 138 states and 139 transitions. [2022-12-14 08:56:12,259 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 3.5384615384615383) internal successors, (138), 38 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:56:12,259 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 139 transitions. [2022-12-14 08:56:12,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2022-12-14 08:56:12,260 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:56:12,260 INFO L195 NwaCegarLoop]: trace histogram [34, 33, 33, 33, 1, 1, 1, 1] [2022-12-14 08:56:12,265 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Ended with exit code 0 [2022-12-14 08:56:12,460 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65,66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:56:12,461 INFO L420 AbstractCegarLoop]: === Iteration 67 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:56:12,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:56:12,462 INFO L85 PathProgramCache]: Analyzing trace with hash -772479734, now seen corresponding path program 65 times [2022-12-14 08:56:12,462 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:56:12,462 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1601067477] [2022-12-14 08:56:12,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:56:12,463 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:56:12,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:56:14,032 INFO L134 CoverageAnalysis]: Checked inductivity of 2211 backedges. 1553 proven. 658 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:14,032 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:56:14,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1601067477] [2022-12-14 08:56:14,032 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1601067477] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:56:14,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [732852803] [2022-12-14 08:56:14,032 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:56:14,032 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:56:14,032 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:56:14,033 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:56:14,034 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Waiting until timeout for monitored process [2022-12-14 08:56:14,176 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2022-12-14 08:56:14,176 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:56:14,179 INFO L263 TraceCheckSpWp]: Trace formula consists of 533 conjuncts, 70 conjunts are in the unsatisfiable core [2022-12-14 08:56:14,181 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:56:15,812 INFO L134 CoverageAnalysis]: Checked inductivity of 2211 backedges. 1650 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:15,812 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:56:17,148 INFO L134 CoverageAnalysis]: Checked inductivity of 2211 backedges. 1650 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:17,148 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [732852803] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:56:17,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [298057180] [2022-12-14 08:56:17,149 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:56:17,149 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:56:17,149 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:56:17,149 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:56:17,149 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:56:17,197 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:56:17,661 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '53026#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:56:17,661 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:56:17,661 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:56:17,661 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 105 [2022-12-14 08:56:17,661 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [286188742] [2022-12-14 08:56:17,661 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:56:17,662 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 106 states [2022-12-14 08:56:17,662 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:56:17,663 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2022-12-14 08:56:17,663 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2539, Invalid=9671, Unknown=0, NotChecked=0, Total=12210 [2022-12-14 08:56:17,664 INFO L87 Difference]: Start difference. First operand 138 states and 139 transitions. Second operand has 106 states, 106 states have (on average 2.30188679245283) internal successors, (244), 105 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) [2022-12-14 08:56:18,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:56:18,861 INFO L93 Difference]: Finished difference Result 244 states and 246 transitions. [2022-12-14 08:56:18,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2022-12-14 08:56:18,861 INFO L78 Accepts]: Start accepts. Automaton has has 106 states, 106 states have (on average 2.30188679245283) internal successors, (244), 105 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 137 [2022-12-14 08:56:18,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:56:18,862 INFO L225 Difference]: With dead ends: 244 [2022-12-14 08:56:18,862 INFO L226 Difference]: Without dead ends: 139 [2022-12-14 08:56:18,863 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 512 GetRequests, 302 SyntacticMatches, 67 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7871 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=4360, Invalid=16520, Unknown=0, NotChecked=0, Total=20880 [2022-12-14 08:56:18,863 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 7 mSDsluCounter, 274 mSDsCounter, 0 mSdLazyCounter, 636 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 309 SdHoareTripleChecker+Invalid, 636 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 636 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 08:56:18,863 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 309 Invalid, 636 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 636 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 08:56:18,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2022-12-14 08:56:18,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 139. [2022-12-14 08:56:18,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 138 states have (on average 1.0144927536231885) internal successors, (140), 138 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:56:18,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 140 transitions. [2022-12-14 08:56:18,892 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 140 transitions. Word has length 137 [2022-12-14 08:56:18,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:56:18,892 INFO L495 AbstractCegarLoop]: Abstraction has 139 states and 140 transitions. [2022-12-14 08:56:18,892 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 106 states, 106 states have (on average 2.30188679245283) internal successors, (244), 105 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) [2022-12-14 08:56:18,892 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 140 transitions. [2022-12-14 08:56:18,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2022-12-14 08:56:18,892 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:56:18,892 INFO L195 NwaCegarLoop]: trace histogram [34, 34, 33, 33, 1, 1, 1, 1] [2022-12-14 08:56:18,897 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Ended with exit code 0 [2022-12-14 08:56:19,093 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable66 [2022-12-14 08:56:19,094 INFO L420 AbstractCegarLoop]: === Iteration 68 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:56:19,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:56:19,094 INFO L85 PathProgramCache]: Analyzing trace with hash 1815843461, now seen corresponding path program 66 times [2022-12-14 08:56:19,094 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:56:19,094 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1837745894] [2022-12-14 08:56:19,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:56:19,095 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:56:19,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:56:19,927 INFO L134 CoverageAnalysis]: Checked inductivity of 2245 backedges. 561 proven. 1684 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:19,927 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:56:19,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1837745894] [2022-12-14 08:56:19,927 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1837745894] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:56:19,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1901099305] [2022-12-14 08:56:19,927 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:56:19,927 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:56:19,927 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:56:19,928 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:56:19,928 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Waiting until timeout for monitored process [2022-12-14 08:56:20,005 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:56:20,005 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:56:20,009 INFO L263 TraceCheckSpWp]: Trace formula consists of 538 conjuncts, 74 conjunts are in the unsatisfiable core [2022-12-14 08:56:20,010 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:56:20,142 INFO L134 CoverageAnalysis]: Checked inductivity of 2245 backedges. 595 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:20,142 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:56:20,785 INFO L134 CoverageAnalysis]: Checked inductivity of 2245 backedges. 595 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:20,785 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1901099305] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:56:20,785 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [740761358] [2022-12-14 08:56:20,786 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:56:20,786 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:56:20,786 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:56:20,786 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:56:20,786 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:56:20,830 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:56:21,007 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '54617#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:56:21,008 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:56:21,008 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:56:21,008 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 39 [2022-12-14 08:56:21,008 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [802009] [2022-12-14 08:56:21,008 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:56:21,008 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-12-14 08:56:21,008 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:56:21,008 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-12-14 08:56:21,009 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=695, Invalid=1285, Unknown=0, NotChecked=0, Total=1980 [2022-12-14 08:56:21,009 INFO L87 Difference]: Start difference. First operand 139 states and 140 transitions. Second operand has 40 states, 40 states have (on average 3.55) internal successors, (142), 39 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) [2022-12-14 08:56:21,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:56:21,449 INFO L93 Difference]: Finished difference Result 150 states and 151 transitions. [2022-12-14 08:56:21,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2022-12-14 08:56:21,449 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 3.55) internal successors, (142), 39 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 138 [2022-12-14 08:56:21,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:56:21,450 INFO L225 Difference]: With dead ends: 150 [2022-12-14 08:56:21,450 INFO L226 Difference]: Without dead ends: 148 [2022-12-14 08:56:21,450 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 518 GetRequests, 371 SyntacticMatches, 68 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2930 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=2102, Invalid=4378, Unknown=0, NotChecked=0, Total=6480 [2022-12-14 08:56:21,450 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 78 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 386 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 78 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 389 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 386 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:56:21,450 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [78 Valid, 16 Invalid, 389 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 386 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:56:21,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2022-12-14 08:56:21,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 142. [2022-12-14 08:56:21,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 141 states have (on average 1.0141843971631206) internal successors, (143), 141 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:56:21,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 143 transitions. [2022-12-14 08:56:21,477 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 143 transitions. Word has length 138 [2022-12-14 08:56:21,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:56:21,477 INFO L495 AbstractCegarLoop]: Abstraction has 142 states and 143 transitions. [2022-12-14 08:56:21,477 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 3.55) internal successors, (142), 39 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) [2022-12-14 08:56:21,477 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 143 transitions. [2022-12-14 08:56:21,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2022-12-14 08:56:21,477 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:56:21,477 INFO L195 NwaCegarLoop]: trace histogram [35, 34, 34, 34, 1, 1, 1, 1] [2022-12-14 08:56:21,481 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Forceful destruction successful, exit code 0 [2022-12-14 08:56:21,678 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable67,68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:56:21,678 INFO L420 AbstractCegarLoop]: === Iteration 69 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:56:21,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:56:21,679 INFO L85 PathProgramCache]: Analyzing trace with hash 684273812, now seen corresponding path program 67 times [2022-12-14 08:56:21,679 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:56:21,680 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1967954202] [2022-12-14 08:56:21,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:56:21,680 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:56:21,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:56:23,135 INFO L134 CoverageAnalysis]: Checked inductivity of 2346 backedges. 1651 proven. 695 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:23,135 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:56:23,135 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1967954202] [2022-12-14 08:56:23,135 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1967954202] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:56:23,135 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1801675181] [2022-12-14 08:56:23,135 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:56:23,136 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:56:23,136 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:56:23,136 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:56:23,137 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Waiting until timeout for monitored process [2022-12-14 08:56:23,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:56:23,211 INFO L263 TraceCheckSpWp]: Trace formula consists of 548 conjuncts, 72 conjunts are in the unsatisfiable core [2022-12-14 08:56:23,213 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:56:24,507 INFO L134 CoverageAnalysis]: Checked inductivity of 2346 backedges. 1751 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:24,507 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:56:25,653 INFO L134 CoverageAnalysis]: Checked inductivity of 2346 backedges. 1751 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:25,653 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1801675181] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:56:25,653 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [434968965] [2022-12-14 08:56:25,654 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:56:25,654 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:56:25,654 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:56:25,654 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:56:25,654 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:56:25,698 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:56:26,070 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '56146#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:56:26,070 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:56:26,070 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:56:26,070 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 108 [2022-12-14 08:56:26,070 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2091005221] [2022-12-14 08:56:26,070 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:56:26,071 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 109 states [2022-12-14 08:56:26,071 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:56:26,071 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 109 interpolants. [2022-12-14 08:56:26,072 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2683, Invalid=10199, Unknown=0, NotChecked=0, Total=12882 [2022-12-14 08:56:26,072 INFO L87 Difference]: Start difference. First operand 142 states and 143 transitions. Second operand has 109 states, 109 states have (on average 2.302752293577982) internal successors, (251), 108 states have internal predecessors, (251), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:56:26,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:56:26,991 INFO L93 Difference]: Finished difference Result 251 states and 253 transitions. [2022-12-14 08:56:26,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2022-12-14 08:56:26,991 INFO L78 Accepts]: Start accepts. Automaton has has 109 states, 109 states have (on average 2.302752293577982) internal successors, (251), 108 states have internal predecessors, (251), 0 states have call successors, (0), 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 141 [2022-12-14 08:56:26,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:56:26,992 INFO L225 Difference]: With dead ends: 251 [2022-12-14 08:56:26,992 INFO L226 Difference]: Without dead ends: 143 [2022-12-14 08:56:26,993 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 527 GetRequests, 311 SyntacticMatches, 69 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8313 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=4610, Invalid=17442, Unknown=0, NotChecked=0, Total=22052 [2022-12-14 08:56:26,993 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 7 mSDsluCounter, 445 mSDsCounter, 0 mSdLazyCounter, 966 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 481 SdHoareTripleChecker+Invalid, 966 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 966 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:56:26,993 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 481 Invalid, 966 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 966 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:56:26,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2022-12-14 08:56:27,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 143. [2022-12-14 08:56:27,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 142 states have (on average 1.0140845070422535) internal successors, (144), 142 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:56:27,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 144 transitions. [2022-12-14 08:56:27,020 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 144 transitions. Word has length 141 [2022-12-14 08:56:27,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:56:27,020 INFO L495 AbstractCegarLoop]: Abstraction has 143 states and 144 transitions. [2022-12-14 08:56:27,020 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 109 states, 109 states have (on average 2.302752293577982) internal successors, (251), 108 states have internal predecessors, (251), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:56:27,020 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 144 transitions. [2022-12-14 08:56:27,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2022-12-14 08:56:27,020 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:56:27,020 INFO L195 NwaCegarLoop]: trace histogram [35, 35, 34, 34, 1, 1, 1, 1] [2022-12-14 08:56:27,025 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Ended with exit code 0 [2022-12-14 08:56:27,221 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable68,69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:56:27,221 INFO L420 AbstractCegarLoop]: === Iteration 70 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:56:27,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:56:27,222 INFO L85 PathProgramCache]: Analyzing trace with hash -1128879985, now seen corresponding path program 68 times [2022-12-14 08:56:27,222 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:56:27,222 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1578975654] [2022-12-14 08:56:27,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:56:27,222 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:56:27,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:56:28,079 INFO L134 CoverageAnalysis]: Checked inductivity of 2381 backedges. 595 proven. 1786 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:28,080 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:56:28,080 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1578975654] [2022-12-14 08:56:28,080 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1578975654] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:56:28,080 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [253090010] [2022-12-14 08:56:28,080 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:56:28,080 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:56:28,080 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:56:28,081 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:56:28,081 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Waiting until timeout for monitored process [2022-12-14 08:56:28,244 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 35 check-sat command(s) [2022-12-14 08:56:28,244 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:56:28,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 553 conjuncts, 76 conjunts are in the unsatisfiable core [2022-12-14 08:56:28,249 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:56:28,387 INFO L134 CoverageAnalysis]: Checked inductivity of 2381 backedges. 630 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:28,387 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:56:29,090 INFO L134 CoverageAnalysis]: Checked inductivity of 2381 backedges. 630 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:29,090 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [253090010] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:56:29,090 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [609577643] [2022-12-14 08:56:29,090 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:56:29,090 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:56:29,090 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:56:29,091 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:56:29,091 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:56:29,137 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:56:29,321 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '57783#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:56:29,322 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:56:29,322 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:56:29,322 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 40 [2022-12-14 08:56:29,322 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1405803788] [2022-12-14 08:56:29,322 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:56:29,322 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-12-14 08:56:29,322 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:56:29,322 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-12-14 08:56:29,323 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=732, Invalid=1338, Unknown=0, NotChecked=0, Total=2070 [2022-12-14 08:56:29,323 INFO L87 Difference]: Start difference. First operand 143 states and 144 transitions. Second operand has 41 states, 41 states have (on average 3.5609756097560976) internal successors, (146), 40 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) [2022-12-14 08:56:29,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:56:29,779 INFO L93 Difference]: Finished difference Result 154 states and 155 transitions. [2022-12-14 08:56:29,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2022-12-14 08:56:29,780 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 3.5609756097560976) internal successors, (146), 40 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) Word has length 142 [2022-12-14 08:56:29,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:56:29,780 INFO L225 Difference]: With dead ends: 154 [2022-12-14 08:56:29,780 INFO L226 Difference]: Without dead ends: 152 [2022-12-14 08:56:29,781 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 533 GetRequests, 382 SyntacticMatches, 70 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3086 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=2215, Invalid=4591, Unknown=0, NotChecked=0, Total=6806 [2022-12-14 08:56:29,781 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 78 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 372 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 78 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 375 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 372 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:56:29,781 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [78 Valid, 16 Invalid, 375 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 372 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:56:29,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2022-12-14 08:56:29,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 146. [2022-12-14 08:56:29,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 145 states have (on average 1.013793103448276) internal successors, (147), 145 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) [2022-12-14 08:56:29,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 147 transitions. [2022-12-14 08:56:29,809 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 147 transitions. Word has length 142 [2022-12-14 08:56:29,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:56:29,809 INFO L495 AbstractCegarLoop]: Abstraction has 146 states and 147 transitions. [2022-12-14 08:56:29,809 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 3.5609756097560976) internal successors, (146), 40 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) [2022-12-14 08:56:29,809 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 147 transitions. [2022-12-14 08:56:29,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2022-12-14 08:56:29,809 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:56:29,810 INFO L195 NwaCegarLoop]: trace histogram [36, 35, 35, 35, 1, 1, 1, 1] [2022-12-14 08:56:29,814 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Ended with exit code 0 [2022-12-14 08:56:30,010 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable69 [2022-12-14 08:56:30,011 INFO L420 AbstractCegarLoop]: === Iteration 71 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:56:30,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:56:30,012 INFO L85 PathProgramCache]: Analyzing trace with hash -864885174, now seen corresponding path program 69 times [2022-12-14 08:56:30,012 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:56:30,012 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [349320589] [2022-12-14 08:56:30,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:56:30,013 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:56:30,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:56:31,460 INFO L134 CoverageAnalysis]: Checked inductivity of 2485 backedges. 1752 proven. 733 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:31,460 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:56:31,460 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [349320589] [2022-12-14 08:56:31,461 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [349320589] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:56:31,461 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [64272089] [2022-12-14 08:56:31,461 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:56:31,461 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:56:31,461 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:56:31,461 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:56:31,462 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Waiting until timeout for monitored process [2022-12-14 08:56:31,531 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:56:31,532 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:56:31,535 INFO L263 TraceCheckSpWp]: Trace formula consists of 563 conjuncts, 74 conjunts are in the unsatisfiable core [2022-12-14 08:56:31,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:56:33,213 INFO L134 CoverageAnalysis]: Checked inductivity of 2485 backedges. 1855 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:33,213 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:56:34,511 INFO L134 CoverageAnalysis]: Checked inductivity of 2485 backedges. 1855 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:34,512 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [64272089] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:56:34,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1543000786] [2022-12-14 08:56:34,512 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:56:34,512 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:56:34,513 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:56:34,513 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:56:34,513 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:56:34,560 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:56:34,817 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '59355#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:56:34,817 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:56:34,817 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:56:34,817 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 73, 73] total 111 [2022-12-14 08:56:34,817 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1353188343] [2022-12-14 08:56:34,817 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:56:34,817 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 112 states [2022-12-14 08:56:34,817 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:56:34,818 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 112 interpolants. [2022-12-14 08:56:34,818 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2831, Invalid=10741, Unknown=0, NotChecked=0, Total=13572 [2022-12-14 08:56:34,819 INFO L87 Difference]: Start difference. First operand 146 states and 147 transitions. Second operand has 112 states, 112 states have (on average 2.3035714285714284) internal successors, (258), 111 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) [2022-12-14 08:56:35,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:56:35,839 INFO L93 Difference]: Finished difference Result 258 states and 260 transitions. [2022-12-14 08:56:35,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2022-12-14 08:56:35,839 INFO L78 Accepts]: Start accepts. Automaton has has 112 states, 112 states have (on average 2.3035714285714284) internal successors, (258), 111 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 145 [2022-12-14 08:56:35,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:56:35,840 INFO L225 Difference]: With dead ends: 258 [2022-12-14 08:56:35,840 INFO L226 Difference]: Without dead ends: 147 [2022-12-14 08:56:35,841 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 542 GetRequests, 320 SyntacticMatches, 71 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8767 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=4867, Invalid=18389, Unknown=0, NotChecked=0, Total=23256 [2022-12-14 08:56:35,842 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 7 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 677 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 331 SdHoareTripleChecker+Invalid, 677 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 677 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:56:35,842 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 331 Invalid, 677 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 677 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:56:35,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2022-12-14 08:56:35,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 147. [2022-12-14 08:56:35,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 146 states have (on average 1.0136986301369864) internal successors, (148), 146 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) [2022-12-14 08:56:35,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 148 transitions. [2022-12-14 08:56:35,880 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 148 transitions. Word has length 145 [2022-12-14 08:56:35,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:56:35,880 INFO L495 AbstractCegarLoop]: Abstraction has 147 states and 148 transitions. [2022-12-14 08:56:35,880 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 112 states, 112 states have (on average 2.3035714285714284) internal successors, (258), 111 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) [2022-12-14 08:56:35,880 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 148 transitions. [2022-12-14 08:56:35,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2022-12-14 08:56:35,881 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:56:35,881 INFO L195 NwaCegarLoop]: trace histogram [36, 36, 35, 35, 1, 1, 1, 1] [2022-12-14 08:56:35,885 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Ended with exit code 0 [2022-12-14 08:56:36,081 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70,71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:56:36,082 INFO L420 AbstractCegarLoop]: === Iteration 72 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:56:36,082 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:56:36,083 INFO L85 PathProgramCache]: Analyzing trace with hash 1016981701, now seen corresponding path program 70 times [2022-12-14 08:56:36,083 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:56:36,083 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1758384331] [2022-12-14 08:56:36,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:56:36,084 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:56:36,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:56:37,123 INFO L134 CoverageAnalysis]: Checked inductivity of 2521 backedges. 630 proven. 1891 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:37,123 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:56:37,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1758384331] [2022-12-14 08:56:37,124 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1758384331] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:56:37,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [774966420] [2022-12-14 08:56:37,124 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:56:37,124 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:56:37,124 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:56:37,125 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:56:37,125 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Waiting until timeout for monitored process [2022-12-14 08:56:37,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:56:37,221 INFO L263 TraceCheckSpWp]: Trace formula consists of 568 conjuncts, 78 conjunts are in the unsatisfiable core [2022-12-14 08:56:37,222 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:56:37,355 INFO L134 CoverageAnalysis]: Checked inductivity of 2521 backedges. 666 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:37,355 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:56:38,117 INFO L134 CoverageAnalysis]: Checked inductivity of 2521 backedges. 666 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:38,117 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [774966420] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:56:38,117 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [798673281] [2022-12-14 08:56:38,118 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:56:38,118 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:56:38,118 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:56:38,118 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:56:38,118 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:56:38,156 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:56:38,328 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '61038#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:56:38,328 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:56:38,328 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:56:38,329 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 41 [2022-12-14 08:56:38,329 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2108703019] [2022-12-14 08:56:38,329 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:56:38,329 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-12-14 08:56:38,329 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:56:38,330 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-12-14 08:56:38,330 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=770, Invalid=1392, Unknown=0, NotChecked=0, Total=2162 [2022-12-14 08:56:38,330 INFO L87 Difference]: Start difference. First operand 147 states and 148 transitions. Second operand has 42 states, 42 states have (on average 3.5714285714285716) internal successors, (150), 41 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:56:38,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:56:38,844 INFO L93 Difference]: Finished difference Result 158 states and 159 transitions. [2022-12-14 08:56:38,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2022-12-14 08:56:38,845 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 3.5714285714285716) internal successors, (150), 41 states have internal predecessors, (150), 0 states have call successors, (0), 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 146 [2022-12-14 08:56:38,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:56:38,846 INFO L225 Difference]: With dead ends: 158 [2022-12-14 08:56:38,846 INFO L226 Difference]: Without dead ends: 156 [2022-12-14 08:56:38,846 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 548 GetRequests, 393 SyntacticMatches, 72 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3246 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=2331, Invalid=4809, Unknown=0, NotChecked=0, Total=7140 [2022-12-14 08:56:38,847 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 152 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 334 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 152 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 337 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 334 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:56:38,847 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [152 Valid, 15 Invalid, 337 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 334 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:56:38,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2022-12-14 08:56:38,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 150. [2022-12-14 08:56:38,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 149 states have (on average 1.0134228187919463) internal successors, (151), 149 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:56:38,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 151 transitions. [2022-12-14 08:56:38,878 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 151 transitions. Word has length 146 [2022-12-14 08:56:38,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:56:38,878 INFO L495 AbstractCegarLoop]: Abstraction has 150 states and 151 transitions. [2022-12-14 08:56:38,878 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 3.5714285714285716) internal successors, (150), 41 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:56:38,878 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 151 transitions. [2022-12-14 08:56:38,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2022-12-14 08:56:38,878 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:56:38,879 INFO L195 NwaCegarLoop]: trace histogram [37, 36, 36, 36, 1, 1, 1, 1] [2022-12-14 08:56:38,884 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Ended with exit code 0 [2022-12-14 08:56:39,079 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71,72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:56:39,079 INFO L420 AbstractCegarLoop]: === Iteration 73 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:56:39,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:56:39,080 INFO L85 PathProgramCache]: Analyzing trace with hash 207368788, now seen corresponding path program 71 times [2022-12-14 08:56:39,080 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:56:39,080 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1535116700] [2022-12-14 08:56:39,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:56:39,081 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:56:39,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:56:40,970 INFO L134 CoverageAnalysis]: Checked inductivity of 2628 backedges. 1856 proven. 772 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:40,970 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:56:40,970 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1535116700] [2022-12-14 08:56:40,971 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1535116700] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:56:40,971 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1566800653] [2022-12-14 08:56:40,971 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:56:40,971 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:56:40,971 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:56:40,972 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:56:40,972 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Waiting until timeout for monitored process [2022-12-14 08:56:41,109 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 37 check-sat command(s) [2022-12-14 08:56:41,109 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:56:41,112 INFO L263 TraceCheckSpWp]: Trace formula consists of 578 conjuncts, 76 conjunts are in the unsatisfiable core [2022-12-14 08:56:41,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:56:42,653 INFO L134 CoverageAnalysis]: Checked inductivity of 2628 backedges. 1962 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:42,654 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:56:43,956 INFO L134 CoverageAnalysis]: Checked inductivity of 2628 backedges. 1962 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:43,956 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1566800653] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:56:43,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [867446704] [2022-12-14 08:56:43,957 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:56:43,957 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:56:43,957 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:56:43,957 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:56:43,957 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:56:44,007 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:56:44,337 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '62653#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:56:44,337 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:56:44,337 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:56:44,337 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 75, 75] total 114 [2022-12-14 08:56:44,337 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1020946259] [2022-12-14 08:56:44,337 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:56:44,337 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 115 states [2022-12-14 08:56:44,337 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:56:44,338 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 115 interpolants. [2022-12-14 08:56:44,339 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2983, Invalid=11297, Unknown=0, NotChecked=0, Total=14280 [2022-12-14 08:56:44,339 INFO L87 Difference]: Start difference. First operand 150 states and 151 transitions. Second operand has 115 states, 115 states have (on average 2.3043478260869565) internal successors, (265), 114 states have internal predecessors, (265), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:56:45,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:56:45,319 INFO L93 Difference]: Finished difference Result 265 states and 267 transitions. [2022-12-14 08:56:45,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2022-12-14 08:56:45,320 INFO L78 Accepts]: Start accepts. Automaton has has 115 states, 115 states have (on average 2.3043478260869565) internal successors, (265), 114 states have internal predecessors, (265), 0 states have call successors, (0), 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 149 [2022-12-14 08:56:45,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:56:45,320 INFO L225 Difference]: With dead ends: 265 [2022-12-14 08:56:45,320 INFO L226 Difference]: Without dead ends: 151 [2022-12-14 08:56:45,321 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 557 GetRequests, 329 SyntacticMatches, 73 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9233 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=5131, Invalid=19361, Unknown=0, NotChecked=0, Total=24492 [2022-12-14 08:56:45,321 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 7 mSDsluCounter, 364 mSDsCounter, 0 mSdLazyCounter, 806 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 402 SdHoareTripleChecker+Invalid, 806 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 806 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:56:45,321 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 402 Invalid, 806 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 806 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:56:45,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2022-12-14 08:56:45,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 151. [2022-12-14 08:56:45,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 150 states have (on average 1.0133333333333334) internal successors, (152), 150 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:56:45,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 152 transitions. [2022-12-14 08:56:45,351 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 152 transitions. Word has length 149 [2022-12-14 08:56:45,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:56:45,351 INFO L495 AbstractCegarLoop]: Abstraction has 151 states and 152 transitions. [2022-12-14 08:56:45,351 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 115 states, 115 states have (on average 2.3043478260869565) internal successors, (265), 114 states have internal predecessors, (265), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:56:45,351 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 152 transitions. [2022-12-14 08:56:45,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2022-12-14 08:56:45,351 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:56:45,351 INFO L195 NwaCegarLoop]: trace histogram [37, 37, 36, 36, 1, 1, 1, 1] [2022-12-14 08:56:45,356 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Ended with exit code 0 [2022-12-14 08:56:45,552 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72,73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:56:45,553 INFO L420 AbstractCegarLoop]: === Iteration 74 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:56:45,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:56:45,553 INFO L85 PathProgramCache]: Analyzing trace with hash -1845788849, now seen corresponding path program 72 times [2022-12-14 08:56:45,554 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:56:45,554 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1948882859] [2022-12-14 08:56:45,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:56:45,554 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:56:45,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:56:46,519 INFO L134 CoverageAnalysis]: Checked inductivity of 2665 backedges. 666 proven. 1999 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:46,520 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:56:46,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1948882859] [2022-12-14 08:56:46,520 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1948882859] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:56:46,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [407883333] [2022-12-14 08:56:46,520 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:56:46,520 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:56:46,520 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:56:46,521 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:56:46,521 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Waiting until timeout for monitored process [2022-12-14 08:56:46,596 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:56:46,597 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:56:46,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 583 conjuncts, 80 conjunts are in the unsatisfiable core [2022-12-14 08:56:46,602 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:56:46,726 INFO L134 CoverageAnalysis]: Checked inductivity of 2665 backedges. 703 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:46,727 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:56:47,542 INFO L134 CoverageAnalysis]: Checked inductivity of 2665 backedges. 703 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:47,542 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [407883333] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:56:47,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [339523599] [2022-12-14 08:56:47,543 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:56:47,543 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:56:47,543 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:56:47,543 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:56:47,543 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:56:47,583 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:56:47,840 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '64382#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:56:47,840 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:56:47,840 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:56:47,841 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 42 [2022-12-14 08:56:47,841 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1222197769] [2022-12-14 08:56:47,841 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:56:47,841 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-12-14 08:56:47,841 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:56:47,842 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-12-14 08:56:47,842 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=809, Invalid=1447, Unknown=0, NotChecked=0, Total=2256 [2022-12-14 08:56:47,842 INFO L87 Difference]: Start difference. First operand 151 states and 152 transitions. Second operand has 43 states, 43 states have (on average 3.5813953488372094) internal successors, (154), 42 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) [2022-12-14 08:56:48,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:56:48,409 INFO L93 Difference]: Finished difference Result 162 states and 163 transitions. [2022-12-14 08:56:48,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2022-12-14 08:56:48,409 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 3.5813953488372094) internal successors, (154), 42 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 150 [2022-12-14 08:56:48,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:56:48,410 INFO L225 Difference]: With dead ends: 162 [2022-12-14 08:56:48,411 INFO L226 Difference]: Without dead ends: 160 [2022-12-14 08:56:48,411 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 563 GetRequests, 404 SyntacticMatches, 74 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3410 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=2450, Invalid=5032, Unknown=0, NotChecked=0, Total=7482 [2022-12-14 08:56:48,411 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 84 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 407 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 410 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 407 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:56:48,412 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [84 Valid, 18 Invalid, 410 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 407 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:56:48,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2022-12-14 08:56:48,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 154. [2022-12-14 08:56:48,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154 states, 153 states have (on average 1.0130718954248366) internal successors, (155), 153 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:56:48,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 155 transitions. [2022-12-14 08:56:48,449 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 155 transitions. Word has length 150 [2022-12-14 08:56:48,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:56:48,449 INFO L495 AbstractCegarLoop]: Abstraction has 154 states and 155 transitions. [2022-12-14 08:56:48,450 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 3.5813953488372094) internal successors, (154), 42 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) [2022-12-14 08:56:48,450 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 155 transitions. [2022-12-14 08:56:48,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2022-12-14 08:56:48,450 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:56:48,450 INFO L195 NwaCegarLoop]: trace histogram [38, 37, 37, 37, 1, 1, 1, 1] [2022-12-14 08:56:48,455 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Forceful destruction successful, exit code 0 [2022-12-14 08:56:48,651 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73,74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:56:48,651 INFO L420 AbstractCegarLoop]: === Iteration 75 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:56:48,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:56:48,652 INFO L85 PathProgramCache]: Analyzing trace with hash 575510410, now seen corresponding path program 73 times [2022-12-14 08:56:48,652 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:56:48,652 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1013857808] [2022-12-14 08:56:48,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:56:48,653 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:56:48,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:56:50,435 INFO L134 CoverageAnalysis]: Checked inductivity of 2775 backedges. 1963 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:50,435 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:56:50,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1013857808] [2022-12-14 08:56:50,436 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1013857808] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:56:50,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1458615098] [2022-12-14 08:56:50,436 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:56:50,436 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:56:50,436 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:56:50,437 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:56:50,437 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (75)] Waiting until timeout for monitored process [2022-12-14 08:56:50,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:56:50,508 INFO L263 TraceCheckSpWp]: Trace formula consists of 593 conjuncts, 78 conjunts are in the unsatisfiable core [2022-12-14 08:56:50,510 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:56:52,356 INFO L134 CoverageAnalysis]: Checked inductivity of 2775 backedges. 2072 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:52,356 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:56:53,567 INFO L134 CoverageAnalysis]: Checked inductivity of 2775 backedges. 2072 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:53,567 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1458615098] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:56:53,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1560565470] [2022-12-14 08:56:53,568 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:56:53,568 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:56:53,568 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:56:53,568 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:56:53,568 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:56:53,629 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:56:54,021 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '66040#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:56:54,021 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:56:54,021 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:56:54,021 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 77, 77] total 117 [2022-12-14 08:56:54,021 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1393090052] [2022-12-14 08:56:54,021 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:56:54,021 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 118 states [2022-12-14 08:56:54,022 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:56:54,022 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 118 interpolants. [2022-12-14 08:56:54,023 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3139, Invalid=11867, Unknown=0, NotChecked=0, Total=15006 [2022-12-14 08:56:54,023 INFO L87 Difference]: Start difference. First operand 154 states and 155 transitions. Second operand has 118 states, 118 states have (on average 2.305084745762712) internal successors, (272), 117 states have internal predecessors, (272), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:56:55,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:56:55,002 INFO L93 Difference]: Finished difference Result 272 states and 274 transitions. [2022-12-14 08:56:55,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2022-12-14 08:56:55,003 INFO L78 Accepts]: Start accepts. Automaton has has 118 states, 118 states have (on average 2.305084745762712) internal successors, (272), 117 states have internal predecessors, (272), 0 states have call successors, (0), 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 153 [2022-12-14 08:56:55,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:56:55,004 INFO L225 Difference]: With dead ends: 272 [2022-12-14 08:56:55,004 INFO L226 Difference]: Without dead ends: 155 [2022-12-14 08:56:55,005 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 572 GetRequests, 338 SyntacticMatches, 75 SemanticMatches, 159 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9711 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=5402, Invalid=20358, Unknown=0, NotChecked=0, Total=25760 [2022-12-14 08:56:55,005 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 7 mSDsluCounter, 382 mSDsCounter, 0 mSdLazyCounter, 858 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 421 SdHoareTripleChecker+Invalid, 858 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 858 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:56:55,005 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 421 Invalid, 858 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 858 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:56:55,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2022-12-14 08:56:55,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 155. [2022-12-14 08:56:55,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 154 states have (on average 1.0129870129870129) internal successors, (156), 154 states have internal predecessors, (156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:56:55,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 156 transitions. [2022-12-14 08:56:55,039 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 156 transitions. Word has length 153 [2022-12-14 08:56:55,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:56:55,039 INFO L495 AbstractCegarLoop]: Abstraction has 155 states and 156 transitions. [2022-12-14 08:56:55,039 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 118 states, 118 states have (on average 2.305084745762712) internal successors, (272), 117 states have internal predecessors, (272), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:56:55,039 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 156 transitions. [2022-12-14 08:56:55,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2022-12-14 08:56:55,040 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:56:55,040 INFO L195 NwaCegarLoop]: trace histogram [38, 38, 37, 37, 1, 1, 1, 1] [2022-12-14 08:56:55,044 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (75)] Ended with exit code 0 [2022-12-14 08:56:55,240 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable74,75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:56:55,241 INFO L420 AbstractCegarLoop]: === Iteration 76 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:56:55,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:56:55,242 INFO L85 PathProgramCache]: Analyzing trace with hash -46665979, now seen corresponding path program 74 times [2022-12-14 08:56:55,242 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:56:55,242 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2132698994] [2022-12-14 08:56:55,243 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:56:55,243 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:56:55,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:56:56,317 INFO L134 CoverageAnalysis]: Checked inductivity of 2813 backedges. 703 proven. 2110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:56,317 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:56:56,318 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2132698994] [2022-12-14 08:56:56,318 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2132698994] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:56:56,318 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [747374723] [2022-12-14 08:56:56,318 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:56:56,318 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:56:56,318 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:56:56,318 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:56:56,319 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Waiting until timeout for monitored process [2022-12-14 08:56:56,463 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 38 check-sat command(s) [2022-12-14 08:56:56,463 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:56:56,466 INFO L263 TraceCheckSpWp]: Trace formula consists of 598 conjuncts, 82 conjunts are in the unsatisfiable core [2022-12-14 08:56:56,468 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:56:56,617 INFO L134 CoverageAnalysis]: Checked inductivity of 2813 backedges. 741 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:56,617 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:56:57,498 INFO L134 CoverageAnalysis]: Checked inductivity of 2813 backedges. 741 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:57,498 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [747374723] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:56:57,498 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [898722614] [2022-12-14 08:56:57,499 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:56:57,499 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:56:57,499 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:56:57,499 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:56:57,499 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:56:57,545 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:56:57,750 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '67815#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:56:57,750 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:56:57,750 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:56:57,750 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 43 [2022-12-14 08:56:57,750 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [990918055] [2022-12-14 08:56:57,750 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:56:57,751 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-12-14 08:56:57,751 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:56:57,751 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-12-14 08:56:57,751 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=849, Invalid=1503, Unknown=0, NotChecked=0, Total=2352 [2022-12-14 08:56:57,751 INFO L87 Difference]: Start difference. First operand 155 states and 156 transitions. Second operand has 44 states, 44 states have (on average 3.590909090909091) internal successors, (158), 43 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) [2022-12-14 08:56:58,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:56:58,323 INFO L93 Difference]: Finished difference Result 166 states and 167 transitions. [2022-12-14 08:56:58,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2022-12-14 08:56:58,323 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 3.590909090909091) internal successors, (158), 43 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) Word has length 154 [2022-12-14 08:56:58,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:56:58,324 INFO L225 Difference]: With dead ends: 166 [2022-12-14 08:56:58,324 INFO L226 Difference]: Without dead ends: 164 [2022-12-14 08:56:58,324 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 415 SyntacticMatches, 76 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3578 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=2572, Invalid=5260, Unknown=0, NotChecked=0, Total=7832 [2022-12-14 08:56:58,325 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 84 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 391 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 394 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 391 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:56:58,325 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [84 Valid, 12 Invalid, 394 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 391 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:56:58,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2022-12-14 08:56:58,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 158. [2022-12-14 08:56:58,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 158 states, 157 states have (on average 1.0127388535031847) internal successors, (159), 157 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) [2022-12-14 08:56:58,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 159 transitions. [2022-12-14 08:56:58,357 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 159 transitions. Word has length 154 [2022-12-14 08:56:58,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:56:58,357 INFO L495 AbstractCegarLoop]: Abstraction has 158 states and 159 transitions. [2022-12-14 08:56:58,357 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 3.590909090909091) internal successors, (158), 43 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) [2022-12-14 08:56:58,358 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 159 transitions. [2022-12-14 08:56:58,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2022-12-14 08:56:58,358 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:56:58,358 INFO L195 NwaCegarLoop]: trace histogram [39, 38, 38, 38, 1, 1, 1, 1] [2022-12-14 08:56:58,363 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Ended with exit code 0 [2022-12-14 08:56:58,559 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable75 [2022-12-14 08:56:58,560 INFO L420 AbstractCegarLoop]: === Iteration 77 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:56:58,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:56:58,561 INFO L85 PathProgramCache]: Analyzing trace with hash 1348043796, now seen corresponding path program 75 times [2022-12-14 08:56:58,561 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:56:58,561 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1292267853] [2022-12-14 08:56:58,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:56:58,562 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:56:58,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:57:00,371 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 2073 proven. 853 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:57:00,371 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:57:00,371 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1292267853] [2022-12-14 08:57:00,372 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1292267853] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:57:00,372 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1359925898] [2022-12-14 08:57:00,372 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:57:00,372 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:57:00,372 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:57:00,373 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:57:00,373 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (77)] Waiting until timeout for monitored process [2022-12-14 08:57:00,450 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:57:00,450 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:57:00,454 INFO L263 TraceCheckSpWp]: Trace formula consists of 608 conjuncts, 80 conjunts are in the unsatisfiable core [2022-12-14 08:57:00,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:57:01,896 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 2185 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:57:01,896 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:57:03,289 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 2185 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:57:03,290 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1359925898] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:57:03,290 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [779920007] [2022-12-14 08:57:03,290 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:57:03,291 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:57:03,291 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:57:03,291 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:57:03,291 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:57:03,336 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:57:03,923 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '69516#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:57:03,923 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:57:03,923 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:57:03,923 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 79, 79] total 120 [2022-12-14 08:57:03,923 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1224788156] [2022-12-14 08:57:03,923 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:57:03,923 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 121 states [2022-12-14 08:57:03,923 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:57:03,924 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 121 interpolants. [2022-12-14 08:57:03,925 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3299, Invalid=12451, Unknown=0, NotChecked=0, Total=15750 [2022-12-14 08:57:03,925 INFO L87 Difference]: Start difference. First operand 158 states and 159 transitions. Second operand has 121 states, 121 states have (on average 2.3057851239669422) internal successors, (279), 120 states have internal predecessors, (279), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:57:05,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:57:05,373 INFO L93 Difference]: Finished difference Result 279 states and 281 transitions. [2022-12-14 08:57:05,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2022-12-14 08:57:05,374 INFO L78 Accepts]: Start accepts. Automaton has has 121 states, 121 states have (on average 2.3057851239669422) internal successors, (279), 120 states have internal predecessors, (279), 0 states have call successors, (0), 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 157 [2022-12-14 08:57:05,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:57:05,375 INFO L225 Difference]: With dead ends: 279 [2022-12-14 08:57:05,375 INFO L226 Difference]: Without dead ends: 159 [2022-12-14 08:57:05,376 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 587 GetRequests, 347 SyntacticMatches, 77 SemanticMatches, 163 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10201 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=5680, Invalid=21380, Unknown=0, NotChecked=0, Total=27060 [2022-12-14 08:57:05,376 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 7 mSDsluCounter, 456 mSDsCounter, 0 mSdLazyCounter, 996 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 496 SdHoareTripleChecker+Invalid, 996 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 996 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 08:57:05,376 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 496 Invalid, 996 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 996 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 08:57:05,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2022-12-14 08:57:05,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 159. [2022-12-14 08:57:05,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 158 states have (on average 1.0126582278481013) internal successors, (160), 158 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:57:05,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 160 transitions. [2022-12-14 08:57:05,420 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 160 transitions. Word has length 157 [2022-12-14 08:57:05,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:57:05,420 INFO L495 AbstractCegarLoop]: Abstraction has 159 states and 160 transitions. [2022-12-14 08:57:05,420 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 121 states, 121 states have (on average 2.3057851239669422) internal successors, (279), 120 states have internal predecessors, (279), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:57:05,420 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 160 transitions. [2022-12-14 08:57:05,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2022-12-14 08:57:05,420 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:57:05,420 INFO L195 NwaCegarLoop]: trace histogram [39, 39, 38, 38, 1, 1, 1, 1] [2022-12-14 08:57:05,425 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (77)] Ended with exit code 0 [2022-12-14 08:57:05,621 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable76,77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:57:05,622 INFO L420 AbstractCegarLoop]: === Iteration 78 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:57:05,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:57:05,623 INFO L85 PathProgramCache]: Analyzing trace with hash 1996858895, now seen corresponding path program 76 times [2022-12-14 08:57:05,623 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:57:05,623 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1653320444] [2022-12-14 08:57:05,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:57:05,624 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:57:05,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:57:06,842 INFO L134 CoverageAnalysis]: Checked inductivity of 2965 backedges. 741 proven. 2224 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:57:06,842 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:57:06,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1653320444] [2022-12-14 08:57:06,842 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1653320444] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:57:06,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1303750351] [2022-12-14 08:57:06,842 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:57:06,842 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:57:06,842 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:57:06,843 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:57:06,844 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Waiting until timeout for monitored process [2022-12-14 08:57:06,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:57:06,917 INFO L263 TraceCheckSpWp]: Trace formula consists of 613 conjuncts, 84 conjunts are in the unsatisfiable core [2022-12-14 08:57:06,918 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:57:07,077 INFO L134 CoverageAnalysis]: Checked inductivity of 2965 backedges. 780 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:57:07,078 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:57:08,032 INFO L134 CoverageAnalysis]: Checked inductivity of 2965 backedges. 780 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:57:08,032 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1303750351] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:57:08,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1457488721] [2022-12-14 08:57:08,033 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:57:08,033 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:57:08,033 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:57:08,033 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:57:08,033 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:57:08,075 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:57:08,300 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '71337#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:57:08,300 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:57:08,300 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:57:08,300 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 44 [2022-12-14 08:57:08,300 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1912123184] [2022-12-14 08:57:08,300 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:57:08,301 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-12-14 08:57:08,301 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:57:08,301 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-12-14 08:57:08,301 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=890, Invalid=1560, Unknown=0, NotChecked=0, Total=2450 [2022-12-14 08:57:08,301 INFO L87 Difference]: Start difference. First operand 159 states and 160 transitions. Second operand has 45 states, 45 states have (on average 3.6) internal successors, (162), 44 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:57:09,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:57:09,009 INFO L93 Difference]: Finished difference Result 170 states and 171 transitions. [2022-12-14 08:57:09,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2022-12-14 08:57:09,009 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 3.6) internal successors, (162), 44 states have internal predecessors, (162), 0 states have call successors, (0), 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 158 [2022-12-14 08:57:09,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:57:09,010 INFO L225 Difference]: With dead ends: 170 [2022-12-14 08:57:09,011 INFO L226 Difference]: Without dead ends: 168 [2022-12-14 08:57:09,011 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 593 GetRequests, 426 SyntacticMatches, 78 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3750 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=2697, Invalid=5493, Unknown=0, NotChecked=0, Total=8190 [2022-12-14 08:57:09,011 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 164 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 369 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 164 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 372 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 369 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:57:09,012 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [164 Valid, 15 Invalid, 372 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 369 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:57:09,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2022-12-14 08:57:09,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 162. [2022-12-14 08:57:09,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 161 states have (on average 1.0124223602484472) internal successors, (163), 161 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:57:09,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 163 transitions. [2022-12-14 08:57:09,047 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 163 transitions. Word has length 158 [2022-12-14 08:57:09,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:57:09,047 INFO L495 AbstractCegarLoop]: Abstraction has 162 states and 163 transitions. [2022-12-14 08:57:09,047 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 3.6) internal successors, (162), 44 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:57:09,047 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 163 transitions. [2022-12-14 08:57:09,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2022-12-14 08:57:09,047 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:57:09,047 INFO L195 NwaCegarLoop]: trace histogram [40, 39, 39, 39, 1, 1, 1, 1] [2022-12-14 08:57:09,053 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Ended with exit code 0 [2022-12-14 08:57:09,248 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable77 [2022-12-14 08:57:09,248 INFO L420 AbstractCegarLoop]: === Iteration 79 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:57:09,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:57:09,248 INFO L85 PathProgramCache]: Analyzing trace with hash -1163855670, now seen corresponding path program 77 times [2022-12-14 08:57:09,248 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:57:09,248 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2001817598] [2022-12-14 08:57:09,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:57:09,248 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:57:09,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:57:11,045 INFO L134 CoverageAnalysis]: Checked inductivity of 3081 backedges. 2186 proven. 895 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:57:11,045 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:57:11,045 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2001817598] [2022-12-14 08:57:11,045 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2001817598] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:57:11,045 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1799890636] [2022-12-14 08:57:11,045 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:57:11,045 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:57:11,045 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:57:11,046 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:57:11,046 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Waiting until timeout for monitored process [2022-12-14 08:57:11,241 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 40 check-sat command(s) [2022-12-14 08:57:11,241 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:57:11,245 INFO L263 TraceCheckSpWp]: Trace formula consists of 623 conjuncts, 82 conjunts are in the unsatisfiable core [2022-12-14 08:57:11,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:57:12,725 INFO L134 CoverageAnalysis]: Checked inductivity of 3081 backedges. 2301 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:57:12,726 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:57:14,100 INFO L134 CoverageAnalysis]: Checked inductivity of 3081 backedges. 2301 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:57:14,101 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1799890636] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:57:14,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1257813744] [2022-12-14 08:57:14,102 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:57:14,102 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:57:14,102 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:57:14,102 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:57:14,102 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:57:14,152 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:57:14,469 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '73081#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:57:14,469 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:57:14,469 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:57:14,470 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [81, 81, 81] total 123 [2022-12-14 08:57:14,470 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1388331869] [2022-12-14 08:57:14,470 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:57:14,470 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 124 states [2022-12-14 08:57:14,470 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:57:14,471 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 124 interpolants. [2022-12-14 08:57:14,471 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3463, Invalid=13049, Unknown=0, NotChecked=0, Total=16512 [2022-12-14 08:57:14,471 INFO L87 Difference]: Start difference. First operand 162 states and 163 transitions. Second operand has 124 states, 124 states have (on average 2.306451612903226) internal successors, (286), 123 states have internal predecessors, (286), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:57:15,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:57:15,814 INFO L93 Difference]: Finished difference Result 286 states and 288 transitions. [2022-12-14 08:57:15,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2022-12-14 08:57:15,814 INFO L78 Accepts]: Start accepts. Automaton has has 124 states, 124 states have (on average 2.306451612903226) internal successors, (286), 123 states have internal predecessors, (286), 0 states have call successors, (0), 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 161 [2022-12-14 08:57:15,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:57:15,814 INFO L225 Difference]: With dead ends: 286 [2022-12-14 08:57:15,815 INFO L226 Difference]: Without dead ends: 163 [2022-12-14 08:57:15,816 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 602 GetRequests, 356 SyntacticMatches, 79 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10703 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=5965, Invalid=22427, Unknown=0, NotChecked=0, Total=28392 [2022-12-14 08:57:15,816 INFO L413 NwaCegarLoop]: 41 mSDtfsCounter, 7 mSDsluCounter, 489 mSDsCounter, 0 mSdLazyCounter, 1060 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 530 SdHoareTripleChecker+Invalid, 1060 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1060 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 08:57:15,816 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 530 Invalid, 1060 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1060 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 08:57:15,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2022-12-14 08:57:15,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 163. [2022-12-14 08:57:15,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 163 states, 162 states have (on average 1.0123456790123457) internal successors, (164), 162 states have internal predecessors, (164), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:57:15,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 164 transitions. [2022-12-14 08:57:15,861 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 164 transitions. Word has length 161 [2022-12-14 08:57:15,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:57:15,862 INFO L495 AbstractCegarLoop]: Abstraction has 163 states and 164 transitions. [2022-12-14 08:57:15,862 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 124 states, 124 states have (on average 2.306451612903226) internal successors, (286), 123 states have internal predecessors, (286), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:57:15,862 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 164 transitions. [2022-12-14 08:57:15,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 163 [2022-12-14 08:57:15,863 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:57:15,863 INFO L195 NwaCegarLoop]: trace histogram [40, 40, 39, 39, 1, 1, 1, 1] [2022-12-14 08:57:15,867 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Ended with exit code 0 [2022-12-14 08:57:16,063 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable78,79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:57:16,064 INFO L420 AbstractCegarLoop]: === Iteration 80 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:57:16,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:57:16,065 INFO L85 PathProgramCache]: Analyzing trace with hash -1977244347, now seen corresponding path program 78 times [2022-12-14 08:57:16,065 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:57:16,065 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [319085187] [2022-12-14 08:57:16,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:57:16,066 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:57:16,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:57:17,227 INFO L134 CoverageAnalysis]: Checked inductivity of 3121 backedges. 780 proven. 2341 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:57:17,227 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:57:17,227 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [319085187] [2022-12-14 08:57:17,228 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [319085187] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:57:17,228 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [953049841] [2022-12-14 08:57:17,228 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:57:17,228 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:57:17,228 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:57:17,228 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:57:17,229 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Waiting until timeout for monitored process [2022-12-14 08:57:17,332 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:57:17,332 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:57:17,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 628 conjuncts, 86 conjunts are in the unsatisfiable core [2022-12-14 08:57:17,339 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:57:17,481 INFO L134 CoverageAnalysis]: Checked inductivity of 3121 backedges. 820 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:57:17,482 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:57:18,397 INFO L134 CoverageAnalysis]: Checked inductivity of 3121 backedges. 820 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:57:18,397 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [953049841] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:57:18,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [667439852] [2022-12-14 08:57:18,398 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:57:18,398 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:57:18,398 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:57:18,398 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:57:18,399 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:57:18,450 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:57:18,694 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '74948#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:57:18,694 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:57:18,694 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:57:18,694 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 45 [2022-12-14 08:57:18,695 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [241653649] [2022-12-14 08:57:18,695 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:57:18,695 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-12-14 08:57:18,695 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:57:18,696 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-12-14 08:57:18,696 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=932, Invalid=1618, Unknown=0, NotChecked=0, Total=2550 [2022-12-14 08:57:18,696 INFO L87 Difference]: Start difference. First operand 163 states and 164 transitions. Second operand has 46 states, 46 states have (on average 3.608695652173913) internal successors, (166), 45 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:57:19,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:57:19,236 INFO L93 Difference]: Finished difference Result 174 states and 175 transitions. [2022-12-14 08:57:19,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2022-12-14 08:57:19,236 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 3.608695652173913) internal successors, (166), 45 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 162 [2022-12-14 08:57:19,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:57:19,237 INFO L225 Difference]: With dead ends: 174 [2022-12-14 08:57:19,237 INFO L226 Difference]: Without dead ends: 172 [2022-12-14 08:57:19,237 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 608 GetRequests, 437 SyntacticMatches, 80 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3926 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2825, Invalid=5731, Unknown=0, NotChecked=0, Total=8556 [2022-12-14 08:57:19,237 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 168 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 389 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 168 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 392 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 389 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:57:19,237 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [168 Valid, 19 Invalid, 392 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 389 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:57:19,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2022-12-14 08:57:19,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 166. [2022-12-14 08:57:19,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 165 states have (on average 1.0121212121212122) internal successors, (167), 165 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:57:19,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 167 transitions. [2022-12-14 08:57:19,276 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 167 transitions. Word has length 162 [2022-12-14 08:57:19,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:57:19,276 INFO L495 AbstractCegarLoop]: Abstraction has 166 states and 167 transitions. [2022-12-14 08:57:19,276 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 3.608695652173913) internal successors, (166), 45 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:57:19,276 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 167 transitions. [2022-12-14 08:57:19,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2022-12-14 08:57:19,277 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:57:19,277 INFO L195 NwaCegarLoop]: trace histogram [41, 40, 40, 40, 1, 1, 1, 1] [2022-12-14 08:57:19,281 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Ended with exit code 0 [2022-12-14 08:57:19,477 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable79 [2022-12-14 08:57:19,478 INFO L420 AbstractCegarLoop]: === Iteration 81 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:57:19,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:57:19,479 INFO L85 PathProgramCache]: Analyzing trace with hash 1394943444, now seen corresponding path program 79 times [2022-12-14 08:57:19,479 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:57:19,479 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1550867763] [2022-12-14 08:57:19,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:57:19,480 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:57:19,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:57:21,443 INFO L134 CoverageAnalysis]: Checked inductivity of 3240 backedges. 2302 proven. 938 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:57:21,443 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:57:21,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1550867763] [2022-12-14 08:57:21,443 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1550867763] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:57:21,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [690415224] [2022-12-14 08:57:21,443 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:57:21,444 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:57:21,444 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:57:21,444 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:57:21,445 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Waiting until timeout for monitored process [2022-12-14 08:57:21,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:57:21,529 INFO L263 TraceCheckSpWp]: Trace formula consists of 638 conjuncts, 84 conjunts are in the unsatisfiable core [2022-12-14 08:57:21,530 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:57:23,425 INFO L134 CoverageAnalysis]: Checked inductivity of 3240 backedges. 2420 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:57:23,425 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:57:24,947 INFO L134 CoverageAnalysis]: Checked inductivity of 3240 backedges. 2420 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:57:24,947 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [690415224] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:57:24,947 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [657299735] [2022-12-14 08:57:24,948 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:57:24,948 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:57:24,948 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:57:24,948 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:57:24,948 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:57:24,987 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:57:25,292 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '76735#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:57:25,292 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:57:25,292 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:57:25,292 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [83, 83, 83] total 126 [2022-12-14 08:57:25,292 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [726703366] [2022-12-14 08:57:25,293 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:57:25,293 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 127 states [2022-12-14 08:57:25,293 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:57:25,294 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 127 interpolants. [2022-12-14 08:57:25,294 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3631, Invalid=13661, Unknown=0, NotChecked=0, Total=17292 [2022-12-14 08:57:25,294 INFO L87 Difference]: Start difference. First operand 166 states and 167 transitions. Second operand has 127 states, 127 states have (on average 2.3070866141732282) internal successors, (293), 126 states have internal predecessors, (293), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:57:26,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:57:26,707 INFO L93 Difference]: Finished difference Result 293 states and 295 transitions. [2022-12-14 08:57:26,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2022-12-14 08:57:26,707 INFO L78 Accepts]: Start accepts. Automaton has has 127 states, 127 states have (on average 2.3070866141732282) internal successors, (293), 126 states have internal predecessors, (293), 0 states have call successors, (0), 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 165 [2022-12-14 08:57:26,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:57:26,708 INFO L225 Difference]: With dead ends: 293 [2022-12-14 08:57:26,708 INFO L226 Difference]: Without dead ends: 167 [2022-12-14 08:57:26,709 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 617 GetRequests, 365 SyntacticMatches, 81 SemanticMatches, 171 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11217 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=6257, Invalid=23499, Unknown=0, NotChecked=0, Total=29756 [2022-12-14 08:57:26,709 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 7 mSDsluCounter, 413 mSDsCounter, 0 mSdLazyCounter, 921 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 455 SdHoareTripleChecker+Invalid, 921 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 921 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 08:57:26,710 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 455 Invalid, 921 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 921 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 08:57:26,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2022-12-14 08:57:26,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 167. [2022-12-14 08:57:26,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 166 states have (on average 1.0120481927710843) internal successors, (168), 166 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:57:26,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 168 transitions. [2022-12-14 08:57:26,755 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 168 transitions. Word has length 165 [2022-12-14 08:57:26,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:57:26,755 INFO L495 AbstractCegarLoop]: Abstraction has 167 states and 168 transitions. [2022-12-14 08:57:26,756 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 127 states, 127 states have (on average 2.3070866141732282) internal successors, (293), 126 states have internal predecessors, (293), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:57:26,756 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 168 transitions. [2022-12-14 08:57:26,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2022-12-14 08:57:26,756 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:57:26,756 INFO L195 NwaCegarLoop]: trace histogram [41, 41, 40, 40, 1, 1, 1, 1] [2022-12-14 08:57:26,760 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Forceful destruction successful, exit code 0 [2022-12-14 08:57:26,957 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable80 [2022-12-14 08:57:26,957 INFO L420 AbstractCegarLoop]: === Iteration 82 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:57:26,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:57:26,958 INFO L85 PathProgramCache]: Analyzing trace with hash 1060707535, now seen corresponding path program 80 times [2022-12-14 08:57:26,958 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:57:26,959 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1872159850] [2022-12-14 08:57:26,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:57:26,959 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:57:27,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:57:28,368 INFO L134 CoverageAnalysis]: Checked inductivity of 3281 backedges. 820 proven. 2461 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:57:28,368 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:57:28,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1872159850] [2022-12-14 08:57:28,368 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1872159850] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:57:28,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1346481429] [2022-12-14 08:57:28,368 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:57:28,368 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:57:28,369 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:57:28,369 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:57:28,370 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Waiting until timeout for monitored process [2022-12-14 08:57:28,524 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 41 check-sat command(s) [2022-12-14 08:57:28,525 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:57:28,528 INFO L263 TraceCheckSpWp]: Trace formula consists of 643 conjuncts, 88 conjunts are in the unsatisfiable core [2022-12-14 08:57:28,530 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:57:28,656 INFO L134 CoverageAnalysis]: Checked inductivity of 3281 backedges. 861 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:57:28,656 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:57:29,623 INFO L134 CoverageAnalysis]: Checked inductivity of 3281 backedges. 861 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:57:29,623 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1346481429] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:57:29,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1782899885] [2022-12-14 08:57:29,624 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:57:29,624 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:57:29,624 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:57:29,625 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:57:29,625 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:57:29,670 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:57:29,861 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '78648#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:57:29,861 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:57:29,861 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:57:29,861 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 46 [2022-12-14 08:57:29,861 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1912661002] [2022-12-14 08:57:29,861 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:57:29,861 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-12-14 08:57:29,861 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:57:29,862 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-12-14 08:57:29,862 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=975, Invalid=1677, Unknown=0, NotChecked=0, Total=2652 [2022-12-14 08:57:29,862 INFO L87 Difference]: Start difference. First operand 167 states and 168 transitions. Second operand has 47 states, 47 states have (on average 3.617021276595745) internal successors, (170), 46 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) [2022-12-14 08:57:30,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:57:30,475 INFO L93 Difference]: Finished difference Result 178 states and 179 transitions. [2022-12-14 08:57:30,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2022-12-14 08:57:30,475 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 3.617021276595745) internal successors, (170), 46 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 166 [2022-12-14 08:57:30,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:57:30,476 INFO L225 Difference]: With dead ends: 178 [2022-12-14 08:57:30,476 INFO L226 Difference]: Without dead ends: 176 [2022-12-14 08:57:30,476 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 623 GetRequests, 448 SyntacticMatches, 82 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4106 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=2956, Invalid=5974, Unknown=0, NotChecked=0, Total=8930 [2022-12-14 08:57:30,476 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 172 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 388 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 172 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 391 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 388 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:57:30,477 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [172 Valid, 15 Invalid, 391 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 388 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:57:30,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2022-12-14 08:57:30,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 170. [2022-12-14 08:57:30,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 170 states, 169 states have (on average 1.0118343195266273) internal successors, (171), 169 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) [2022-12-14 08:57:30,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 171 transitions. [2022-12-14 08:57:30,513 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 171 transitions. Word has length 166 [2022-12-14 08:57:30,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:57:30,514 INFO L495 AbstractCegarLoop]: Abstraction has 170 states and 171 transitions. [2022-12-14 08:57:30,514 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 3.617021276595745) internal successors, (170), 46 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) [2022-12-14 08:57:30,514 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 171 transitions. [2022-12-14 08:57:30,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2022-12-14 08:57:30,514 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:57:30,515 INFO L195 NwaCegarLoop]: trace histogram [42, 41, 41, 41, 1, 1, 1, 1] [2022-12-14 08:57:30,519 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Ended with exit code 0 [2022-12-14 08:57:30,715 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable81,82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:57:30,716 INFO L420 AbstractCegarLoop]: === Iteration 83 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:57:30,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:57:30,717 INFO L85 PathProgramCache]: Analyzing trace with hash 1468598794, now seen corresponding path program 81 times [2022-12-14 08:57:30,718 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:57:30,718 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [455940778] [2022-12-14 08:57:30,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:57:30,719 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:57:30,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:57:32,688 INFO L134 CoverageAnalysis]: Checked inductivity of 3403 backedges. 2421 proven. 982 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:57:32,688 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:57:32,689 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [455940778] [2022-12-14 08:57:32,689 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [455940778] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:57:32,689 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [92264230] [2022-12-14 08:57:32,689 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:57:32,689 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:57:32,689 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:57:32,690 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:57:32,691 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (83)] Waiting until timeout for monitored process [2022-12-14 08:57:32,771 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:57:32,771 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:57:32,776 INFO L263 TraceCheckSpWp]: Trace formula consists of 653 conjuncts, 86 conjunts are in the unsatisfiable core [2022-12-14 08:57:32,778 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:57:35,063 INFO L134 CoverageAnalysis]: Checked inductivity of 3403 backedges. 2542 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:57:35,063 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:57:36,618 INFO L134 CoverageAnalysis]: Checked inductivity of 3403 backedges. 2542 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:57:36,618 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [92264230] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:57:36,618 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [97789860] [2022-12-14 08:57:36,619 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:57:36,619 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:57:36,619 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:57:36,619 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:57:36,620 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:57:36,659 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:57:36,968 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '80478#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:57:36,968 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:57:36,968 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:57:36,968 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [85, 85, 85] total 129 [2022-12-14 08:57:36,968 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1591150984] [2022-12-14 08:57:36,968 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:57:36,969 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 130 states [2022-12-14 08:57:36,969 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:57:36,970 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 130 interpolants. [2022-12-14 08:57:36,970 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3803, Invalid=14287, Unknown=0, NotChecked=0, Total=18090 [2022-12-14 08:57:36,970 INFO L87 Difference]: Start difference. First operand 170 states and 171 transitions. Second operand has 130 states, 130 states have (on average 2.3076923076923075) internal successors, (300), 129 states have internal predecessors, (300), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:57:38,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:57:38,455 INFO L93 Difference]: Finished difference Result 300 states and 302 transitions. [2022-12-14 08:57:38,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2022-12-14 08:57:38,455 INFO L78 Accepts]: Start accepts. Automaton has has 130 states, 130 states have (on average 2.3076923076923075) internal successors, (300), 129 states have internal predecessors, (300), 0 states have call successors, (0), 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 169 [2022-12-14 08:57:38,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:57:38,456 INFO L225 Difference]: With dead ends: 300 [2022-12-14 08:57:38,456 INFO L226 Difference]: Without dead ends: 171 [2022-12-14 08:57:38,458 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 632 GetRequests, 374 SyntacticMatches, 83 SemanticMatches, 175 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11743 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=6556, Invalid=24596, Unknown=0, NotChecked=0, Total=31152 [2022-12-14 08:57:38,459 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 7 mSDsluCounter, 602 mSDsCounter, 0 mSdLazyCounter, 1291 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 645 SdHoareTripleChecker+Invalid, 1291 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1291 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 08:57:38,459 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 645 Invalid, 1291 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1291 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 08:57:38,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2022-12-14 08:57:38,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 171. [2022-12-14 08:57:38,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 170 states have (on average 1.011764705882353) internal successors, (172), 170 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) [2022-12-14 08:57:38,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 172 transitions. [2022-12-14 08:57:38,522 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 172 transitions. Word has length 169 [2022-12-14 08:57:38,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:57:38,522 INFO L495 AbstractCegarLoop]: Abstraction has 171 states and 172 transitions. [2022-12-14 08:57:38,522 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 130 states, 130 states have (on average 2.3076923076923075) internal successors, (300), 129 states have internal predecessors, (300), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:57:38,522 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 172 transitions. [2022-12-14 08:57:38,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2022-12-14 08:57:38,523 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:57:38,523 INFO L195 NwaCegarLoop]: trace histogram [42, 42, 41, 41, 1, 1, 1, 1] [2022-12-14 08:57:38,528 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (83)] Ended with exit code 0 [2022-12-14 08:57:38,723 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable82,83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:57:38,724 INFO L420 AbstractCegarLoop]: === Iteration 84 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:57:38,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:57:38,724 INFO L85 PathProgramCache]: Analyzing trace with hash -1702687867, now seen corresponding path program 82 times [2022-12-14 08:57:38,724 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:57:38,724 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1866182984] [2022-12-14 08:57:38,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:57:38,724 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:57:38,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:57:39,934 INFO L134 CoverageAnalysis]: Checked inductivity of 3445 backedges. 861 proven. 2584 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:57:39,934 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:57:39,934 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1866182984] [2022-12-14 08:57:39,934 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1866182984] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:57:39,934 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1904753902] [2022-12-14 08:57:39,934 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:57:39,934 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:57:39,934 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:57:39,935 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:57:39,936 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Waiting until timeout for monitored process [2022-12-14 08:57:40,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:57:40,018 INFO L263 TraceCheckSpWp]: Trace formula consists of 658 conjuncts, 90 conjunts are in the unsatisfiable core [2022-12-14 08:57:40,019 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:57:40,164 INFO L134 CoverageAnalysis]: Checked inductivity of 3445 backedges. 903 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:57:40,164 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:57:41,255 INFO L134 CoverageAnalysis]: Checked inductivity of 3445 backedges. 903 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:57:41,256 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1904753902] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:57:41,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [501770786] [2022-12-14 08:57:41,256 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:57:41,256 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:57:41,256 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:57:41,256 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:57:41,257 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:57:41,307 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:57:41,469 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '82437#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:57:41,469 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:57:41,469 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:57:41,469 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 47 [2022-12-14 08:57:41,469 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1061367778] [2022-12-14 08:57:41,469 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:57:41,469 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-12-14 08:57:41,469 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:57:41,470 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-12-14 08:57:41,470 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1019, Invalid=1737, Unknown=0, NotChecked=0, Total=2756 [2022-12-14 08:57:41,470 INFO L87 Difference]: Start difference. First operand 171 states and 172 transitions. Second operand has 48 states, 48 states have (on average 3.625) internal successors, (174), 47 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:57:42,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:57:42,168 INFO L93 Difference]: Finished difference Result 182 states and 183 transitions. [2022-12-14 08:57:42,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2022-12-14 08:57:42,168 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 3.625) internal successors, (174), 47 states have internal predecessors, (174), 0 states have call successors, (0), 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 170 [2022-12-14 08:57:42,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:57:42,169 INFO L225 Difference]: With dead ends: 182 [2022-12-14 08:57:42,169 INFO L226 Difference]: Without dead ends: 180 [2022-12-14 08:57:42,169 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 638 GetRequests, 459 SyntacticMatches, 84 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4290 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=3090, Invalid=6222, Unknown=0, NotChecked=0, Total=9312 [2022-12-14 08:57:42,169 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 92 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 470 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 473 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 470 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:57:42,170 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [92 Valid, 18 Invalid, 473 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 470 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:57:42,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2022-12-14 08:57:42,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 174. [2022-12-14 08:57:42,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 174 states, 173 states have (on average 1.0115606936416186) internal successors, (175), 173 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:57:42,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 175 transitions. [2022-12-14 08:57:42,208 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 175 transitions. Word has length 170 [2022-12-14 08:57:42,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:57:42,208 INFO L495 AbstractCegarLoop]: Abstraction has 174 states and 175 transitions. [2022-12-14 08:57:42,208 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 3.625) internal successors, (174), 47 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:57:42,208 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 175 transitions. [2022-12-14 08:57:42,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2022-12-14 08:57:42,209 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:57:42,209 INFO L195 NwaCegarLoop]: trace histogram [43, 42, 42, 42, 1, 1, 1, 1] [2022-12-14 08:57:42,214 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Forceful destruction successful, exit code 0 [2022-12-14 08:57:42,409 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable83,84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:57:42,410 INFO L420 AbstractCegarLoop]: === Iteration 85 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:57:42,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:57:42,411 INFO L85 PathProgramCache]: Analyzing trace with hash -1205659756, now seen corresponding path program 83 times [2022-12-14 08:57:42,411 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:57:42,411 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1292154572] [2022-12-14 08:57:42,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:57:42,412 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:57:42,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:57:44,600 INFO L134 CoverageAnalysis]: Checked inductivity of 3570 backedges. 2543 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:57:44,601 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:57:44,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1292154572] [2022-12-14 08:57:44,601 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1292154572] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:57:44,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1317389492] [2022-12-14 08:57:44,601 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:57:44,601 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:57:44,601 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:57:44,602 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:57:44,602 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Waiting until timeout for monitored process [2022-12-14 08:57:44,766 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 43 check-sat command(s) [2022-12-14 08:57:44,766 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:57:44,769 INFO L263 TraceCheckSpWp]: Trace formula consists of 668 conjuncts, 88 conjunts are in the unsatisfiable core [2022-12-14 08:57:44,771 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:57:47,039 INFO L134 CoverageAnalysis]: Checked inductivity of 3570 backedges. 2667 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:57:47,039 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:57:49,109 INFO L134 CoverageAnalysis]: Checked inductivity of 3570 backedges. 2667 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:57:49,109 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1317389492] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:57:49,109 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [502110783] [2022-12-14 08:57:49,110 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:57:49,110 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:57:49,110 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:57:49,110 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:57:49,110 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:57:49,156 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:57:49,688 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '84310#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:57:49,688 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:57:49,688 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:57:49,688 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [87, 87, 87] total 132 [2022-12-14 08:57:49,688 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1520710904] [2022-12-14 08:57:49,689 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:57:49,689 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 133 states [2022-12-14 08:57:49,689 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:57:49,691 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 133 interpolants. [2022-12-14 08:57:49,691 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3979, Invalid=14927, Unknown=0, NotChecked=0, Total=18906 [2022-12-14 08:57:49,692 INFO L87 Difference]: Start difference. First operand 174 states and 175 transitions. Second operand has 133 states, 133 states have (on average 2.308270676691729) internal successors, (307), 132 states have internal predecessors, (307), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:57:51,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:57:51,481 INFO L93 Difference]: Finished difference Result 307 states and 309 transitions. [2022-12-14 08:57:51,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2022-12-14 08:57:51,481 INFO L78 Accepts]: Start accepts. Automaton has has 133 states, 133 states have (on average 2.308270676691729) internal successors, (307), 132 states have internal predecessors, (307), 0 states have call successors, (0), 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 173 [2022-12-14 08:57:51,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:57:51,482 INFO L225 Difference]: With dead ends: 307 [2022-12-14 08:57:51,482 INFO L226 Difference]: Without dead ends: 175 [2022-12-14 08:57:51,484 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 647 GetRequests, 383 SyntacticMatches, 85 SemanticMatches, 179 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12281 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=6862, Invalid=25718, Unknown=0, NotChecked=0, Total=32580 [2022-12-14 08:57:51,484 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 7 mSDsluCounter, 345 mSDsCounter, 0 mSdLazyCounter, 796 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 389 SdHoareTripleChecker+Invalid, 796 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 796 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 08:57:51,484 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 389 Invalid, 796 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 796 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 08:57:51,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2022-12-14 08:57:51,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 175. [2022-12-14 08:57:51,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 175 states, 174 states have (on average 1.0114942528735633) internal successors, (176), 174 states have internal predecessors, (176), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:57:51,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 176 transitions. [2022-12-14 08:57:51,532 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 176 transitions. Word has length 173 [2022-12-14 08:57:51,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:57:51,533 INFO L495 AbstractCegarLoop]: Abstraction has 175 states and 176 transitions. [2022-12-14 08:57:51,533 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 133 states, 133 states have (on average 2.308270676691729) internal successors, (307), 132 states have internal predecessors, (307), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:57:51,533 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 176 transitions. [2022-12-14 08:57:51,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2022-12-14 08:57:51,533 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:57:51,533 INFO L195 NwaCegarLoop]: trace histogram [43, 43, 42, 42, 1, 1, 1, 1] [2022-12-14 08:57:51,538 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Ended with exit code 0 [2022-12-14 08:57:51,734 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable84,85 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:57:51,734 INFO L420 AbstractCegarLoop]: === Iteration 86 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:57:51,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:57:51,735 INFO L85 PathProgramCache]: Analyzing trace with hash 49931151, now seen corresponding path program 84 times [2022-12-14 08:57:51,735 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:57:51,736 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1385497306] [2022-12-14 08:57:51,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:57:51,736 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:57:51,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:57:53,434 INFO L134 CoverageAnalysis]: Checked inductivity of 3613 backedges. 903 proven. 2710 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:57:53,434 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:57:53,434 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1385497306] [2022-12-14 08:57:53,434 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1385497306] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:57:53,434 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [642300452] [2022-12-14 08:57:53,434 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:57:53,434 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:57:53,435 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:57:53,435 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:57:53,436 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (86)] Waiting until timeout for monitored process [2022-12-14 08:57:53,558 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:57:53,558 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:57:53,563 INFO L263 TraceCheckSpWp]: Trace formula consists of 673 conjuncts, 92 conjunts are in the unsatisfiable core [2022-12-14 08:57:53,565 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:57:53,707 INFO L134 CoverageAnalysis]: Checked inductivity of 3613 backedges. 946 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:57:53,707 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:57:54,794 INFO L134 CoverageAnalysis]: Checked inductivity of 3613 backedges. 946 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:57:54,794 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [642300452] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:57:54,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [44515001] [2022-12-14 08:57:54,795 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:57:54,795 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:57:54,795 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:57:54,796 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:57:54,796 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:57:54,837 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:57:55,083 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '86315#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:57:55,083 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:57:55,083 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:57:55,083 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 48 [2022-12-14 08:57:55,083 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1093471472] [2022-12-14 08:57:55,083 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:57:55,083 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-12-14 08:57:55,083 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:57:55,084 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-12-14 08:57:55,084 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1064, Invalid=1798, Unknown=0, NotChecked=0, Total=2862 [2022-12-14 08:57:55,084 INFO L87 Difference]: Start difference. First operand 175 states and 176 transitions. Second operand has 49 states, 49 states have (on average 3.63265306122449) internal successors, (178), 48 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) [2022-12-14 08:57:55,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:57:55,826 INFO L93 Difference]: Finished difference Result 186 states and 187 transitions. [2022-12-14 08:57:55,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2022-12-14 08:57:55,826 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 3.63265306122449) internal successors, (178), 48 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 174 [2022-12-14 08:57:55,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:57:55,827 INFO L225 Difference]: With dead ends: 186 [2022-12-14 08:57:55,827 INFO L226 Difference]: Without dead ends: 184 [2022-12-14 08:57:55,828 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 653 GetRequests, 470 SyntacticMatches, 86 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4478 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=3227, Invalid=6475, Unknown=0, NotChecked=0, Total=9702 [2022-12-14 08:57:55,828 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 96 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 470 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 473 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 470 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:57:55,828 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [96 Valid, 14 Invalid, 473 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 470 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:57:55,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2022-12-14 08:57:55,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 178. [2022-12-14 08:57:55,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 177 states have (on average 1.0112994350282485) internal successors, (179), 177 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:57:55,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 179 transitions. [2022-12-14 08:57:55,868 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 179 transitions. Word has length 174 [2022-12-14 08:57:55,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:57:55,869 INFO L495 AbstractCegarLoop]: Abstraction has 178 states and 179 transitions. [2022-12-14 08:57:55,869 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 3.63265306122449) internal successors, (178), 48 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) [2022-12-14 08:57:55,869 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 179 transitions. [2022-12-14 08:57:55,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2022-12-14 08:57:55,869 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:57:55,869 INFO L195 NwaCegarLoop]: trace histogram [44, 43, 43, 43, 1, 1, 1, 1] [2022-12-14 08:57:55,874 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (86)] Ended with exit code 0 [2022-12-14 08:57:56,070 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable85,86 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:57:56,070 INFO L420 AbstractCegarLoop]: === Iteration 87 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:57:56,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:57:56,071 INFO L85 PathProgramCache]: Analyzing trace with hash 1445055306, now seen corresponding path program 85 times [2022-12-14 08:57:56,071 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:57:56,071 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2115764403] [2022-12-14 08:57:56,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:57:56,072 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:57:56,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:57:58,659 INFO L134 CoverageAnalysis]: Checked inductivity of 3741 backedges. 2668 proven. 1073 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:57:58,660 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:57:58,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2115764403] [2022-12-14 08:57:58,660 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2115764403] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:57:58,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1679674565] [2022-12-14 08:57:58,660 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:57:58,660 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:57:58,660 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:57:58,661 INFO L229 MonitoredProcess]: Starting monitored process 87 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:57:58,661 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (87)] Waiting until timeout for monitored process [2022-12-14 08:57:58,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:57:58,755 INFO L263 TraceCheckSpWp]: Trace formula consists of 683 conjuncts, 90 conjunts are in the unsatisfiable core [2022-12-14 08:57:58,756 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:58:00,864 INFO L134 CoverageAnalysis]: Checked inductivity of 3741 backedges. 2795 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:58:00,864 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:58:02,436 INFO L134 CoverageAnalysis]: Checked inductivity of 3741 backedges. 2795 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:58:02,436 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1679674565] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:58:02,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1872710527] [2022-12-14 08:58:02,436 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:58:02,437 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:58:02,437 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:58:02,437 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:58:02,437 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:58:02,478 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:58:02,855 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '88231#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:58:02,855 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:58:02,855 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:58:02,855 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [89, 89, 89] total 135 [2022-12-14 08:58:02,855 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [75033123] [2022-12-14 08:58:02,855 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:58:02,855 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 136 states [2022-12-14 08:58:02,855 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:58:02,856 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 136 interpolants. [2022-12-14 08:58:02,857 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4159, Invalid=15581, Unknown=0, NotChecked=0, Total=19740 [2022-12-14 08:58:02,857 INFO L87 Difference]: Start difference. First operand 178 states and 179 transitions. Second operand has 136 states, 136 states have (on average 2.3088235294117645) internal successors, (314), 135 states have internal predecessors, (314), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:58:04,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:58:04,569 INFO L93 Difference]: Finished difference Result 314 states and 316 transitions. [2022-12-14 08:58:04,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2022-12-14 08:58:04,569 INFO L78 Accepts]: Start accepts. Automaton has has 136 states, 136 states have (on average 2.3088235294117645) internal successors, (314), 135 states have internal predecessors, (314), 0 states have call successors, (0), 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 177 [2022-12-14 08:58:04,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:58:04,570 INFO L225 Difference]: With dead ends: 314 [2022-12-14 08:58:04,570 INFO L226 Difference]: Without dead ends: 179 [2022-12-14 08:58:04,571 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 662 GetRequests, 392 SyntacticMatches, 87 SemanticMatches, 183 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12831 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=7175, Invalid=26865, Unknown=0, NotChecked=0, Total=34040 [2022-12-14 08:58:04,572 INFO L413 NwaCegarLoop]: 45 mSDtfsCounter, 7 mSDsluCounter, 628 mSDsCounter, 0 mSdLazyCounter, 1362 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 673 SdHoareTripleChecker+Invalid, 1362 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1362 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 08:58:04,572 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 673 Invalid, 1362 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1362 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 08:58:04,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2022-12-14 08:58:04,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 179. [2022-12-14 08:58:04,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 178 states have (on average 1.0112359550561798) internal successors, (180), 178 states have internal predecessors, (180), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:58:04,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 180 transitions. [2022-12-14 08:58:04,614 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 180 transitions. Word has length 177 [2022-12-14 08:58:04,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:58:04,614 INFO L495 AbstractCegarLoop]: Abstraction has 179 states and 180 transitions. [2022-12-14 08:58:04,614 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 136 states, 136 states have (on average 2.3088235294117645) internal successors, (314), 135 states have internal predecessors, (314), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:58:04,614 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 180 transitions. [2022-12-14 08:58:04,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2022-12-14 08:58:04,614 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:58:04,614 INFO L195 NwaCegarLoop]: trace histogram [44, 44, 43, 43, 1, 1, 1, 1] [2022-12-14 08:58:04,619 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (87)] Ended with exit code 0 [2022-12-14 08:58:04,815 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 87 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable86 [2022-12-14 08:58:04,816 INFO L420 AbstractCegarLoop]: === Iteration 88 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:58:04,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:58:04,816 INFO L85 PathProgramCache]: Analyzing trace with hash -2140397115, now seen corresponding path program 86 times [2022-12-14 08:58:04,817 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:58:04,817 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1625512405] [2022-12-14 08:58:04,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:58:04,817 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:58:04,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:58:06,251 INFO L134 CoverageAnalysis]: Checked inductivity of 3785 backedges. 946 proven. 2839 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:58:06,251 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:58:06,251 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1625512405] [2022-12-14 08:58:06,251 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1625512405] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:58:06,251 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [158952672] [2022-12-14 08:58:06,252 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:58:06,252 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:58:06,252 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:58:06,253 INFO L229 MonitoredProcess]: Starting monitored process 88 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:58:06,253 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Waiting until timeout for monitored process [2022-12-14 08:58:06,421 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 44 check-sat command(s) [2022-12-14 08:58:06,421 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:58:06,425 INFO L263 TraceCheckSpWp]: Trace formula consists of 688 conjuncts, 94 conjunts are in the unsatisfiable core [2022-12-14 08:58:06,429 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:58:06,574 INFO L134 CoverageAnalysis]: Checked inductivity of 3785 backedges. 990 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:58:06,574 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:58:07,519 INFO L134 CoverageAnalysis]: Checked inductivity of 3785 backedges. 990 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:58:07,519 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [158952672] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:58:07,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1794737946] [2022-12-14 08:58:07,520 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:58:07,520 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:58:07,520 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:58:07,520 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:58:07,520 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:58:07,586 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:58:07,842 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '90282#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:58:07,842 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:58:07,842 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:58:07,843 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 49 [2022-12-14 08:58:07,843 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1834293343] [2022-12-14 08:58:07,843 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:58:07,843 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-12-14 08:58:07,843 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:58:07,843 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-12-14 08:58:07,844 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1110, Invalid=1860, Unknown=0, NotChecked=0, Total=2970 [2022-12-14 08:58:07,844 INFO L87 Difference]: Start difference. First operand 179 states and 180 transitions. Second operand has 50 states, 50 states have (on average 3.64) internal successors, (182), 49 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) [2022-12-14 08:58:08,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:58:08,466 INFO L93 Difference]: Finished difference Result 190 states and 191 transitions. [2022-12-14 08:58:08,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2022-12-14 08:58:08,466 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 3.64) internal successors, (182), 49 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) Word has length 178 [2022-12-14 08:58:08,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:58:08,466 INFO L225 Difference]: With dead ends: 190 [2022-12-14 08:58:08,466 INFO L226 Difference]: Without dead ends: 188 [2022-12-14 08:58:08,467 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 668 GetRequests, 481 SyntacticMatches, 88 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4670 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=3367, Invalid=6733, Unknown=0, NotChecked=0, Total=10100 [2022-12-14 08:58:08,467 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 186 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 454 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 186 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 457 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 454 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:58:08,467 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [186 Valid, 17 Invalid, 457 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 454 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:58:08,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2022-12-14 08:58:08,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 182. [2022-12-14 08:58:08,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 182 states, 181 states have (on average 1.011049723756906) internal successors, (183), 181 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) [2022-12-14 08:58:08,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 183 transitions. [2022-12-14 08:58:08,509 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 183 transitions. Word has length 178 [2022-12-14 08:58:08,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:58:08,510 INFO L495 AbstractCegarLoop]: Abstraction has 182 states and 183 transitions. [2022-12-14 08:58:08,510 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 3.64) internal successors, (182), 49 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) [2022-12-14 08:58:08,510 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 183 transitions. [2022-12-14 08:58:08,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2022-12-14 08:58:08,510 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:58:08,510 INFO L195 NwaCegarLoop]: trace histogram [45, 44, 44, 44, 1, 1, 1, 1] [2022-12-14 08:58:08,515 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Ended with exit code 0 [2022-12-14 08:58:08,710 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable87,88 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:58:08,711 INFO L420 AbstractCegarLoop]: === Iteration 89 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:58:08,711 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:58:08,712 INFO L85 PathProgramCache]: Analyzing trace with hash -1481156268, now seen corresponding path program 87 times [2022-12-14 08:58:08,712 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:58:08,712 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [665464413] [2022-12-14 08:58:08,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:58:08,713 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:58:08,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:58:11,239 INFO L134 CoverageAnalysis]: Checked inductivity of 3916 backedges. 2796 proven. 1120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:58:11,239 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:58:11,239 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [665464413] [2022-12-14 08:58:11,239 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [665464413] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:58:11,239 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1290543414] [2022-12-14 08:58:11,240 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:58:11,240 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:58:11,240 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:58:11,240 INFO L229 MonitoredProcess]: Starting monitored process 89 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:58:11,241 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (89)] Waiting until timeout for monitored process [2022-12-14 08:58:11,336 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:58:11,336 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:58:11,341 INFO L263 TraceCheckSpWp]: Trace formula consists of 698 conjuncts, 92 conjunts are in the unsatisfiable core [2022-12-14 08:58:11,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:58:13,815 INFO L134 CoverageAnalysis]: Checked inductivity of 3916 backedges. 2926 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:58:13,815 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:58:15,885 INFO L134 CoverageAnalysis]: Checked inductivity of 3916 backedges. 2926 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:58:15,885 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1290543414] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:58:15,885 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1784019158] [2022-12-14 08:58:15,886 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:58:15,886 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:58:15,886 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:58:15,886 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:58:15,886 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:58:15,932 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:58:16,490 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '92241#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:58:16,490 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:58:16,490 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:58:16,491 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [91, 91, 91] total 138 [2022-12-14 08:58:16,491 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1741848342] [2022-12-14 08:58:16,491 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:58:16,491 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 139 states [2022-12-14 08:58:16,491 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:58:16,492 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 139 interpolants. [2022-12-14 08:58:16,493 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4343, Invalid=16249, Unknown=0, NotChecked=0, Total=20592 [2022-12-14 08:58:16,493 INFO L87 Difference]: Start difference. First operand 182 states and 183 transitions. Second operand has 139 states, 139 states have (on average 2.3093525179856114) internal successors, (321), 138 states have internal predecessors, (321), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:58:18,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:58:18,147 INFO L93 Difference]: Finished difference Result 321 states and 323 transitions. [2022-12-14 08:58:18,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2022-12-14 08:58:18,147 INFO L78 Accepts]: Start accepts. Automaton has has 139 states, 139 states have (on average 2.3093525179856114) internal successors, (321), 138 states have internal predecessors, (321), 0 states have call successors, (0), 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 181 [2022-12-14 08:58:18,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:58:18,148 INFO L225 Difference]: With dead ends: 321 [2022-12-14 08:58:18,148 INFO L226 Difference]: Without dead ends: 183 [2022-12-14 08:58:18,150 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 677 GetRequests, 401 SyntacticMatches, 89 SemanticMatches, 187 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13393 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=7495, Invalid=28037, Unknown=0, NotChecked=0, Total=35532 [2022-12-14 08:58:18,151 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 7 mSDsluCounter, 634 mSDsCounter, 0 mSdLazyCounter, 1367 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 680 SdHoareTripleChecker+Invalid, 1367 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1367 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 08:58:18,151 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 680 Invalid, 1367 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1367 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 08:58:18,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2022-12-14 08:58:18,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 183. [2022-12-14 08:58:18,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 183 states, 182 states have (on average 1.010989010989011) internal successors, (184), 182 states have internal predecessors, (184), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:58:18,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 184 transitions. [2022-12-14 08:58:18,207 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 184 transitions. Word has length 181 [2022-12-14 08:58:18,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:58:18,207 INFO L495 AbstractCegarLoop]: Abstraction has 183 states and 184 transitions. [2022-12-14 08:58:18,207 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 139 states, 139 states have (on average 2.3093525179856114) internal successors, (321), 138 states have internal predecessors, (321), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:58:18,207 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 184 transitions. [2022-12-14 08:58:18,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2022-12-14 08:58:18,207 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:58:18,208 INFO L195 NwaCegarLoop]: trace histogram [45, 45, 44, 44, 1, 1, 1, 1] [2022-12-14 08:58:18,212 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (89)] Ended with exit code 0 [2022-12-14 08:58:18,408 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 89 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable88 [2022-12-14 08:58:18,408 INFO L420 AbstractCegarLoop]: === Iteration 90 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:58:18,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:58:18,408 INFO L85 PathProgramCache]: Analyzing trace with hash 1605106255, now seen corresponding path program 88 times [2022-12-14 08:58:18,408 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:58:18,408 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1022220518] [2022-12-14 08:58:18,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:58:18,408 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:58:18,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:58:19,823 INFO L134 CoverageAnalysis]: Checked inductivity of 3961 backedges. 990 proven. 2971 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:58:19,823 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:58:19,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1022220518] [2022-12-14 08:58:19,823 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1022220518] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:58:19,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1900516399] [2022-12-14 08:58:19,823 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:58:19,823 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:58:19,823 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:58:19,824 INFO L229 MonitoredProcess]: Starting monitored process 90 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:58:19,825 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (90)] Waiting until timeout for monitored process [2022-12-14 08:58:19,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:58:19,920 INFO L263 TraceCheckSpWp]: Trace formula consists of 703 conjuncts, 96 conjunts are in the unsatisfiable core [2022-12-14 08:58:19,922 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:58:20,068 INFO L134 CoverageAnalysis]: Checked inductivity of 3961 backedges. 1035 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:58:20,068 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:58:21,215 INFO L134 CoverageAnalysis]: Checked inductivity of 3961 backedges. 1035 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:58:21,216 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1900516399] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:58:21,216 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1832668529] [2022-12-14 08:58:21,216 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:58:21,217 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:58:21,217 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:58:21,217 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:58:21,217 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:58:21,259 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:58:21,473 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '94338#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:58:21,473 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:58:21,473 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:58:21,473 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 50 [2022-12-14 08:58:21,474 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2098940251] [2022-12-14 08:58:21,474 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:58:21,474 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2022-12-14 08:58:21,474 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:58:21,475 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2022-12-14 08:58:21,475 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1157, Invalid=1923, Unknown=0, NotChecked=0, Total=3080 [2022-12-14 08:58:21,475 INFO L87 Difference]: Start difference. First operand 183 states and 184 transitions. Second operand has 51 states, 51 states have (on average 3.6470588235294117) internal successors, (186), 50 states have internal predecessors, (186), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:58:22,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:58:22,340 INFO L93 Difference]: Finished difference Result 194 states and 195 transitions. [2022-12-14 08:58:22,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2022-12-14 08:58:22,340 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 3.6470588235294117) internal successors, (186), 50 states have internal predecessors, (186), 0 states have call successors, (0), 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 182 [2022-12-14 08:58:22,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:58:22,340 INFO L225 Difference]: With dead ends: 194 [2022-12-14 08:58:22,340 INFO L226 Difference]: Without dead ends: 192 [2022-12-14 08:58:22,341 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 683 GetRequests, 492 SyntacticMatches, 90 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4866 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=3510, Invalid=6996, Unknown=0, NotChecked=0, Total=10506 [2022-12-14 08:58:22,341 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 100 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 477 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 480 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 477 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:58:22,341 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [100 Valid, 20 Invalid, 480 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 477 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:58:22,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2022-12-14 08:58:22,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 186. [2022-12-14 08:58:22,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 186 states, 185 states have (on average 1.0108108108108107) internal successors, (187), 185 states have internal predecessors, (187), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:58:22,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 187 transitions. [2022-12-14 08:58:22,385 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 187 transitions. Word has length 182 [2022-12-14 08:58:22,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:58:22,385 INFO L495 AbstractCegarLoop]: Abstraction has 186 states and 187 transitions. [2022-12-14 08:58:22,386 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 3.6470588235294117) internal successors, (186), 50 states have internal predecessors, (186), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:58:22,386 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 187 transitions. [2022-12-14 08:58:22,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2022-12-14 08:58:22,386 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:58:22,386 INFO L195 NwaCegarLoop]: trace histogram [46, 45, 45, 45, 1, 1, 1, 1] [2022-12-14 08:58:22,391 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (90)] Forceful destruction successful, exit code 0 [2022-12-14 08:58:22,586 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 90 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable89 [2022-12-14 08:58:22,587 INFO L420 AbstractCegarLoop]: === Iteration 91 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:58:22,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:58:22,588 INFO L85 PathProgramCache]: Analyzing trace with hash 1854356618, now seen corresponding path program 89 times [2022-12-14 08:58:22,588 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:58:22,588 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1692691692] [2022-12-14 08:58:22,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:58:22,589 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:58:22,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:58:25,041 INFO L134 CoverageAnalysis]: Checked inductivity of 4095 backedges. 2927 proven. 1168 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:58:25,041 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:58:25,041 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1692691692] [2022-12-14 08:58:25,042 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1692691692] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:58:25,042 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [754834589] [2022-12-14 08:58:25,042 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:58:25,042 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:58:25,042 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:58:25,043 INFO L229 MonitoredProcess]: Starting monitored process 91 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:58:25,043 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Waiting until timeout for monitored process [2022-12-14 08:58:25,221 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 46 check-sat command(s) [2022-12-14 08:58:25,221 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:58:25,225 INFO L263 TraceCheckSpWp]: Trace formula consists of 713 conjuncts, 94 conjunts are in the unsatisfiable core [2022-12-14 08:58:25,227 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:58:27,535 INFO L134 CoverageAnalysis]: Checked inductivity of 4095 backedges. 3060 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:58:27,536 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:58:29,088 INFO L134 CoverageAnalysis]: Checked inductivity of 4095 backedges. 3060 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:58:29,088 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [754834589] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:58:29,088 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1407602764] [2022-12-14 08:58:29,089 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:58:29,089 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:58:29,089 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:58:29,089 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:58:29,089 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:58:29,134 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:58:29,482 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '96340#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:58:29,482 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:58:29,482 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:58:29,482 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [93, 93, 93] total 141 [2022-12-14 08:58:29,483 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1542898646] [2022-12-14 08:58:29,483 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:58:29,483 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 142 states [2022-12-14 08:58:29,483 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:58:29,484 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 142 interpolants. [2022-12-14 08:58:29,485 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4531, Invalid=16931, Unknown=0, NotChecked=0, Total=21462 [2022-12-14 08:58:29,485 INFO L87 Difference]: Start difference. First operand 186 states and 187 transitions. Second operand has 142 states, 142 states have (on average 2.3098591549295775) internal successors, (328), 141 states have internal predecessors, (328), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:58:30,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:58:30,861 INFO L93 Difference]: Finished difference Result 328 states and 330 transitions. [2022-12-14 08:58:30,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2022-12-14 08:58:30,861 INFO L78 Accepts]: Start accepts. Automaton has has 142 states, 142 states have (on average 2.3098591549295775) internal successors, (328), 141 states have internal predecessors, (328), 0 states have call successors, (0), 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 185 [2022-12-14 08:58:30,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:58:30,862 INFO L225 Difference]: With dead ends: 328 [2022-12-14 08:58:30,862 INFO L226 Difference]: Without dead ends: 187 [2022-12-14 08:58:30,864 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 692 GetRequests, 410 SyntacticMatches, 91 SemanticMatches, 191 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13967 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=7822, Invalid=29234, Unknown=0, NotChecked=0, Total=37056 [2022-12-14 08:58:30,864 INFO L413 NwaCegarLoop]: 47 mSDtfsCounter, 7 mSDsluCounter, 523 mSDsCounter, 0 mSdLazyCounter, 1155 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 570 SdHoareTripleChecker+Invalid, 1155 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1155 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 08:58:30,864 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 570 Invalid, 1155 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1155 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 08:58:30,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2022-12-14 08:58:30,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 187. [2022-12-14 08:58:30,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 187 states, 186 states have (on average 1.010752688172043) internal successors, (188), 186 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:58:30,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 188 transitions. [2022-12-14 08:58:30,946 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 188 transitions. Word has length 185 [2022-12-14 08:58:30,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:58:30,946 INFO L495 AbstractCegarLoop]: Abstraction has 187 states and 188 transitions. [2022-12-14 08:58:30,946 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 142 states, 142 states have (on average 2.3098591549295775) internal successors, (328), 141 states have internal predecessors, (328), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:58:30,946 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 188 transitions. [2022-12-14 08:58:30,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2022-12-14 08:58:30,947 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:58:30,947 INFO L195 NwaCegarLoop]: trace histogram [46, 46, 45, 45, 1, 1, 1, 1] [2022-12-14 08:58:30,952 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Ended with exit code 0 [2022-12-14 08:58:31,147 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable90,91 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:58:31,148 INFO L420 AbstractCegarLoop]: === Iteration 92 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:58:31,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:58:31,149 INFO L85 PathProgramCache]: Analyzing trace with hash -386078715, now seen corresponding path program 90 times [2022-12-14 08:58:31,149 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:58:31,149 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1178649481] [2022-12-14 08:58:31,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:58:31,150 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:58:31,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:58:32,645 INFO L134 CoverageAnalysis]: Checked inductivity of 4141 backedges. 1035 proven. 3106 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:58:32,645 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:58:32,645 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1178649481] [2022-12-14 08:58:32,645 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1178649481] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:58:32,645 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [594876308] [2022-12-14 08:58:32,645 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:58:32,645 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:58:32,646 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:58:32,646 INFO L229 MonitoredProcess]: Starting monitored process 92 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:58:32,647 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (92)] Waiting until timeout for monitored process [2022-12-14 08:58:32,747 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:58:32,747 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:58:32,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 718 conjuncts, 98 conjunts are in the unsatisfiable core [2022-12-14 08:58:32,755 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:58:32,913 INFO L134 CoverageAnalysis]: Checked inductivity of 4141 backedges. 1081 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:58:32,913 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:58:34,183 INFO L134 CoverageAnalysis]: Checked inductivity of 4141 backedges. 1081 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:58:34,183 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [594876308] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:58:34,183 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [500696775] [2022-12-14 08:58:34,183 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:58:34,184 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:58:34,184 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:58:34,184 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:58:34,184 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:58:34,224 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:58:34,442 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '98483#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:58:34,442 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:58:34,442 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:58:34,442 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 51 [2022-12-14 08:58:34,442 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1254224829] [2022-12-14 08:58:34,443 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:58:34,443 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-12-14 08:58:34,443 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:58:34,443 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-12-14 08:58:34,444 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1205, Invalid=1987, Unknown=0, NotChecked=0, Total=3192 [2022-12-14 08:58:34,444 INFO L87 Difference]: Start difference. First operand 187 states and 188 transitions. Second operand has 52 states, 52 states have (on average 3.6538461538461537) internal successors, (190), 51 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) [2022-12-14 08:58:35,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:58:35,132 INFO L93 Difference]: Finished difference Result 198 states and 199 transitions. [2022-12-14 08:58:35,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2022-12-14 08:58:35,132 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 3.6538461538461537) internal successors, (190), 51 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 186 [2022-12-14 08:58:35,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:58:35,132 INFO L225 Difference]: With dead ends: 198 [2022-12-14 08:58:35,132 INFO L226 Difference]: Without dead ends: 196 [2022-12-14 08:58:35,133 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 698 GetRequests, 503 SyntacticMatches, 92 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5066 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=3656, Invalid=7264, Unknown=0, NotChecked=0, Total=10920 [2022-12-14 08:58:35,133 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 100 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 598 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 601 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 598 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:58:35,133 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [100 Valid, 28 Invalid, 601 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 598 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:58:35,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2022-12-14 08:58:35,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 190. [2022-12-14 08:58:35,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 190 states, 189 states have (on average 1.0105820105820107) internal successors, (191), 189 states have internal predecessors, (191), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:58:35,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 191 transitions. [2022-12-14 08:58:35,182 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 191 transitions. Word has length 186 [2022-12-14 08:58:35,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:58:35,183 INFO L495 AbstractCegarLoop]: Abstraction has 190 states and 191 transitions. [2022-12-14 08:58:35,183 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 3.6538461538461537) internal successors, (190), 51 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) [2022-12-14 08:58:35,183 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 191 transitions. [2022-12-14 08:58:35,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2022-12-14 08:58:35,183 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:58:35,183 INFO L195 NwaCegarLoop]: trace histogram [47, 46, 46, 46, 1, 1, 1, 1] [2022-12-14 08:58:35,188 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (92)] Ended with exit code 0 [2022-12-14 08:58:35,384 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable91,92 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:58:35,384 INFO L420 AbstractCegarLoop]: === Iteration 93 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:58:35,385 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:58:35,385 INFO L85 PathProgramCache]: Analyzing trace with hash 256240404, now seen corresponding path program 91 times [2022-12-14 08:58:35,385 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:58:35,386 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1923615023] [2022-12-14 08:58:35,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:58:35,386 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:58:35,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:58:38,291 INFO L134 CoverageAnalysis]: Checked inductivity of 4278 backedges. 3061 proven. 1217 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:58:38,291 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:58:38,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1923615023] [2022-12-14 08:58:38,292 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1923615023] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:58:38,292 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [105558287] [2022-12-14 08:58:38,292 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:58:38,292 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:58:38,292 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:58:38,293 INFO L229 MonitoredProcess]: Starting monitored process 93 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:58:38,293 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (93)] Waiting until timeout for monitored process [2022-12-14 08:58:38,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:58:38,377 INFO L263 TraceCheckSpWp]: Trace formula consists of 728 conjuncts, 96 conjunts are in the unsatisfiable core [2022-12-14 08:58:38,380 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:58:40,691 INFO L134 CoverageAnalysis]: Checked inductivity of 4278 backedges. 3197 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:58:40,691 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:58:42,319 INFO L134 CoverageAnalysis]: Checked inductivity of 4278 backedges. 3197 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:58:42,319 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [105558287] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:58:42,319 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [587723281] [2022-12-14 08:58:42,320 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:58:42,320 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:58:42,320 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:58:42,320 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:58:42,321 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:58:42,370 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:58:42,764 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '100528#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:58:42,764 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:58:42,764 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:58:42,764 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [95, 95, 95] total 144 [2022-12-14 08:58:42,764 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1001664421] [2022-12-14 08:58:42,764 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:58:42,765 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 145 states [2022-12-14 08:58:42,765 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:58:42,766 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 145 interpolants. [2022-12-14 08:58:42,766 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4723, Invalid=17627, Unknown=0, NotChecked=0, Total=22350 [2022-12-14 08:58:42,767 INFO L87 Difference]: Start difference. First operand 190 states and 191 transitions. Second operand has 145 states, 145 states have (on average 2.310344827586207) internal successors, (335), 144 states have internal predecessors, (335), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:58:44,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:58:44,383 INFO L93 Difference]: Finished difference Result 335 states and 337 transitions. [2022-12-14 08:58:44,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2022-12-14 08:58:44,383 INFO L78 Accepts]: Start accepts. Automaton has has 145 states, 145 states have (on average 2.310344827586207) internal successors, (335), 144 states have internal predecessors, (335), 0 states have call successors, (0), 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 189 [2022-12-14 08:58:44,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:58:44,384 INFO L225 Difference]: With dead ends: 335 [2022-12-14 08:58:44,384 INFO L226 Difference]: Without dead ends: 191 [2022-12-14 08:58:44,385 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 707 GetRequests, 419 SyntacticMatches, 93 SemanticMatches, 195 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14553 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=8156, Invalid=30456, Unknown=0, NotChecked=0, Total=38612 [2022-12-14 08:58:44,386 INFO L413 NwaCegarLoop]: 48 mSDtfsCounter, 7 mSDsluCounter, 498 mSDsCounter, 0 mSdLazyCounter, 1113 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 546 SdHoareTripleChecker+Invalid, 1113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1113 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 08:58:44,386 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 546 Invalid, 1113 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1113 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 08:58:44,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2022-12-14 08:58:44,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 191. [2022-12-14 08:58:44,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 191 states, 190 states have (on average 1.0105263157894737) internal successors, (192), 190 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:58:44,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 192 transitions. [2022-12-14 08:58:44,436 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 192 transitions. Word has length 189 [2022-12-14 08:58:44,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:58:44,436 INFO L495 AbstractCegarLoop]: Abstraction has 191 states and 192 transitions. [2022-12-14 08:58:44,436 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 145 states, 145 states have (on average 2.310344827586207) internal successors, (335), 144 states have internal predecessors, (335), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:58:44,436 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 192 transitions. [2022-12-14 08:58:44,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2022-12-14 08:58:44,437 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:58:44,437 INFO L195 NwaCegarLoop]: trace histogram [47, 47, 46, 46, 1, 1, 1, 1] [2022-12-14 08:58:44,441 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (93)] Forceful destruction successful, exit code 0 [2022-12-14 08:58:44,637 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable92,93 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:58:44,638 INFO L420 AbstractCegarLoop]: === Iteration 94 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:58:44,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:58:44,639 INFO L85 PathProgramCache]: Analyzing trace with hash -1212980977, now seen corresponding path program 92 times [2022-12-14 08:58:44,639 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:58:44,639 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1899896020] [2022-12-14 08:58:44,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:58:44,640 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:58:44,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:58:46,529 INFO L134 CoverageAnalysis]: Checked inductivity of 4325 backedges. 1081 proven. 3244 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:58:46,529 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:58:46,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1899896020] [2022-12-14 08:58:46,529 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1899896020] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:58:46,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [279898477] [2022-12-14 08:58:46,529 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:58:46,529 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:58:46,530 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:58:46,530 INFO L229 MonitoredProcess]: Starting monitored process 94 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:58:46,531 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (94)] Waiting until timeout for monitored process [2022-12-14 08:58:46,781 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 47 check-sat command(s) [2022-12-14 08:58:46,781 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:58:46,785 INFO L263 TraceCheckSpWp]: Trace formula consists of 733 conjuncts, 100 conjunts are in the unsatisfiable core [2022-12-14 08:58:46,787 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:58:46,931 INFO L134 CoverageAnalysis]: Checked inductivity of 4325 backedges. 1128 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:58:46,931 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:58:48,352 INFO L134 CoverageAnalysis]: Checked inductivity of 4325 backedges. 1128 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:58:48,352 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [279898477] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:58:48,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1840372524] [2022-12-14 08:58:48,353 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:58:48,353 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:58:48,353 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:58:48,353 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:58:48,353 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:58:48,398 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:58:48,769 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '102717#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:58:48,770 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:58:48,770 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:58:48,770 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 52 [2022-12-14 08:58:48,770 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [305422566] [2022-12-14 08:58:48,770 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:58:48,770 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2022-12-14 08:58:48,770 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:58:48,771 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2022-12-14 08:58:48,771 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1254, Invalid=2052, Unknown=0, NotChecked=0, Total=3306 [2022-12-14 08:58:48,771 INFO L87 Difference]: Start difference. First operand 191 states and 192 transitions. Second operand has 53 states, 53 states have (on average 3.660377358490566) internal successors, (194), 52 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) [2022-12-14 08:58:49,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:58:49,733 INFO L93 Difference]: Finished difference Result 202 states and 203 transitions. [2022-12-14 08:58:49,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2022-12-14 08:58:49,734 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 3.660377358490566) internal successors, (194), 52 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) Word has length 190 [2022-12-14 08:58:49,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:58:49,734 INFO L225 Difference]: With dead ends: 202 [2022-12-14 08:58:49,734 INFO L226 Difference]: Without dead ends: 200 [2022-12-14 08:58:49,735 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 713 GetRequests, 514 SyntacticMatches, 94 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5270 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=3805, Invalid=7537, Unknown=0, NotChecked=0, Total=11342 [2022-12-14 08:58:49,735 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 198 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 444 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 198 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 447 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 444 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:58:49,735 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [198 Valid, 21 Invalid, 447 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 444 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:58:49,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2022-12-14 08:58:49,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 194. [2022-12-14 08:58:49,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 194 states, 193 states have (on average 1.0103626943005182) internal successors, (195), 193 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) [2022-12-14 08:58:49,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 195 transitions. [2022-12-14 08:58:49,782 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 195 transitions. Word has length 190 [2022-12-14 08:58:49,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:58:49,783 INFO L495 AbstractCegarLoop]: Abstraction has 194 states and 195 transitions. [2022-12-14 08:58:49,783 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 3.660377358490566) internal successors, (194), 52 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) [2022-12-14 08:58:49,783 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 195 transitions. [2022-12-14 08:58:49,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 194 [2022-12-14 08:58:49,783 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:58:49,783 INFO L195 NwaCegarLoop]: trace histogram [48, 47, 47, 47, 1, 1, 1, 1] [2022-12-14 08:58:49,788 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (94)] Ended with exit code 0 [2022-12-14 08:58:49,984 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable93,94 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:58:49,984 INFO L420 AbstractCegarLoop]: === Iteration 95 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:58:49,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:58:49,985 INFO L85 PathProgramCache]: Analyzing trace with hash 1943363018, now seen corresponding path program 93 times [2022-12-14 08:58:49,985 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:58:49,985 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1094542069] [2022-12-14 08:58:49,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:58:49,986 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:58:50,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:58:53,235 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 3198 proven. 1267 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:58:53,235 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:58:53,235 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1094542069] [2022-12-14 08:58:53,235 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1094542069] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:58:53,235 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1825324854] [2022-12-14 08:58:53,235 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:58:53,235 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:58:53,235 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:58:53,236 INFO L229 MonitoredProcess]: Starting monitored process 95 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:58:53,236 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (95)] Waiting until timeout for monitored process [2022-12-14 08:58:53,364 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:58:53,364 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:58:53,370 INFO L263 TraceCheckSpWp]: Trace formula consists of 743 conjuncts, 98 conjunts are in the unsatisfiable core [2022-12-14 08:58:53,372 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:58:55,693 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 3337 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:58:55,693 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:58:57,661 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 3337 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:58:57,661 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1825324854] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:58:57,661 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [910100392] [2022-12-14 08:58:57,662 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:58:57,662 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:58:57,662 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:58:57,662 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:58:57,662 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:58:57,709 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:58:58,227 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '104805#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:58:58,227 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:58:58,227 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:58:58,228 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97, 97] total 147 [2022-12-14 08:58:58,228 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1576237407] [2022-12-14 08:58:58,228 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:58:58,228 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 148 states [2022-12-14 08:58:58,228 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:58:58,230 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 148 interpolants. [2022-12-14 08:58:58,231 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4919, Invalid=18337, Unknown=0, NotChecked=0, Total=23256 [2022-12-14 08:58:58,231 INFO L87 Difference]: Start difference. First operand 194 states and 195 transitions. Second operand has 148 states, 148 states have (on average 2.310810810810811) internal successors, (342), 147 states have internal predecessors, (342), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:58:59,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:58:59,956 INFO L93 Difference]: Finished difference Result 342 states and 344 transitions. [2022-12-14 08:58:59,956 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2022-12-14 08:58:59,956 INFO L78 Accepts]: Start accepts. Automaton has has 148 states, 148 states have (on average 2.310810810810811) internal successors, (342), 147 states have internal predecessors, (342), 0 states have call successors, (0), 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 193 [2022-12-14 08:58:59,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:58:59,957 INFO L225 Difference]: With dead ends: 342 [2022-12-14 08:58:59,957 INFO L226 Difference]: Without dead ends: 195 [2022-12-14 08:58:59,959 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 722 GetRequests, 428 SyntacticMatches, 95 SemanticMatches, 199 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15151 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=8497, Invalid=31703, Unknown=0, NotChecked=0, Total=40200 [2022-12-14 08:58:59,959 INFO L413 NwaCegarLoop]: 49 mSDtfsCounter, 7 mSDsluCounter, 521 mSDsCounter, 0 mSdLazyCounter, 1161 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 570 SdHoareTripleChecker+Invalid, 1161 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1161 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 08:58:59,959 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 570 Invalid, 1161 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1161 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 08:58:59,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2022-12-14 08:59:00,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 195. [2022-12-14 08:59:00,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 195 states, 194 states have (on average 1.0103092783505154) internal successors, (196), 194 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) [2022-12-14 08:59:00,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 196 transitions. [2022-12-14 08:59:00,021 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 196 transitions. Word has length 193 [2022-12-14 08:59:00,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:59:00,021 INFO L495 AbstractCegarLoop]: Abstraction has 195 states and 196 transitions. [2022-12-14 08:59:00,021 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 148 states, 148 states have (on average 2.310810810810811) internal successors, (342), 147 states have internal predecessors, (342), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:59:00,021 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 196 transitions. [2022-12-14 08:59:00,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2022-12-14 08:59:00,022 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:59:00,022 INFO L195 NwaCegarLoop]: trace histogram [48, 48, 47, 47, 1, 1, 1, 1] [2022-12-14 08:59:00,027 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (95)] Forceful destruction successful, exit code 0 [2022-12-14 08:59:00,223 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable94,95 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:59:00,223 INFO L420 AbstractCegarLoop]: === Iteration 96 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:59:00,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:59:00,224 INFO L85 PathProgramCache]: Analyzing trace with hash -1672389051, now seen corresponding path program 94 times [2022-12-14 08:59:00,224 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:59:00,225 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1639814666] [2022-12-14 08:59:00,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:59:00,225 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:59:00,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:59:01,892 INFO L134 CoverageAnalysis]: Checked inductivity of 4513 backedges. 1128 proven. 3385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:59:01,892 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:59:01,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1639814666] [2022-12-14 08:59:01,893 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1639814666] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:59:01,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1943977155] [2022-12-14 08:59:01,893 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:59:01,893 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:59:01,893 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:59:01,894 INFO L229 MonitoredProcess]: Starting monitored process 96 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:59:01,894 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (96)] Waiting until timeout for monitored process [2022-12-14 08:59:01,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:59:01,999 INFO L263 TraceCheckSpWp]: Trace formula consists of 748 conjuncts, 102 conjunts are in the unsatisfiable core [2022-12-14 08:59:02,001 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:59:02,151 INFO L134 CoverageAnalysis]: Checked inductivity of 4513 backedges. 1176 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:59:02,151 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:59:03,305 INFO L134 CoverageAnalysis]: Checked inductivity of 4513 backedges. 1176 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:59:03,305 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1943977155] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:59:03,305 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1166957581] [2022-12-14 08:59:03,306 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:59:03,306 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:59:03,306 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:59:03,306 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:59:03,306 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:59:03,355 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:59:03,577 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '107040#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:59:03,577 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:59:03,577 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:59:03,577 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 53 [2022-12-14 08:59:03,577 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1340414463] [2022-12-14 08:59:03,577 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:59:03,577 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-12-14 08:59:03,577 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:59:03,578 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-12-14 08:59:03,578 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1304, Invalid=2118, Unknown=0, NotChecked=0, Total=3422 [2022-12-14 08:59:03,578 INFO L87 Difference]: Start difference. First operand 195 states and 196 transitions. Second operand has 54 states, 54 states have (on average 3.6666666666666665) internal successors, (198), 53 states have internal predecessors, (198), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:59:04,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:59:04,396 INFO L93 Difference]: Finished difference Result 206 states and 207 transitions. [2022-12-14 08:59:04,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2022-12-14 08:59:04,396 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 3.6666666666666665) internal successors, (198), 53 states have internal predecessors, (198), 0 states have call successors, (0), 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 194 [2022-12-14 08:59:04,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:59:04,397 INFO L225 Difference]: With dead ends: 206 [2022-12-14 08:59:04,397 INFO L226 Difference]: Without dead ends: 204 [2022-12-14 08:59:04,398 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 728 GetRequests, 525 SyntacticMatches, 96 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5478 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=3957, Invalid=7815, Unknown=0, NotChecked=0, Total=11772 [2022-12-14 08:59:04,398 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 106 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 497 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 106 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 500 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 497 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:59:04,398 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [106 Valid, 20 Invalid, 500 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 497 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:59:04,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2022-12-14 08:59:04,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 198. [2022-12-14 08:59:04,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 198 states, 197 states have (on average 1.0101522842639594) internal successors, (199), 197 states have internal predecessors, (199), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:59:04,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 199 transitions. [2022-12-14 08:59:04,452 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 199 transitions. Word has length 194 [2022-12-14 08:59:04,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:59:04,452 INFO L495 AbstractCegarLoop]: Abstraction has 198 states and 199 transitions. [2022-12-14 08:59:04,453 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 3.6666666666666665) internal successors, (198), 53 states have internal predecessors, (198), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:59:04,453 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 199 transitions. [2022-12-14 08:59:04,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2022-12-14 08:59:04,453 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:59:04,453 INFO L195 NwaCegarLoop]: trace histogram [49, 48, 48, 48, 1, 1, 1, 1] [2022-12-14 08:59:04,457 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (96)] Ended with exit code 0 [2022-12-14 08:59:04,654 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 96 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable95 [2022-12-14 08:59:04,654 INFO L420 AbstractCegarLoop]: === Iteration 97 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:59:04,655 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:59:04,655 INFO L85 PathProgramCache]: Analyzing trace with hash -516764460, now seen corresponding path program 95 times [2022-12-14 08:59:04,655 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:59:04,655 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2089028882] [2022-12-14 08:59:04,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:59:04,656 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:59:04,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:59:07,387 INFO L134 CoverageAnalysis]: Checked inductivity of 4656 backedges. 3338 proven. 1318 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:59:07,387 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:59:07,387 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2089028882] [2022-12-14 08:59:07,387 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2089028882] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:59:07,387 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1216002796] [2022-12-14 08:59:07,387 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:59:07,388 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:59:07,388 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:59:07,388 INFO L229 MonitoredProcess]: Starting monitored process 97 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:59:07,389 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (97)] Waiting until timeout for monitored process [2022-12-14 08:59:07,607 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 49 check-sat command(s) [2022-12-14 08:59:07,608 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:59:07,612 INFO L263 TraceCheckSpWp]: Trace formula consists of 758 conjuncts, 100 conjunts are in the unsatisfiable core [2022-12-14 08:59:07,614 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:59:11,031 INFO L134 CoverageAnalysis]: Checked inductivity of 4656 backedges. 3480 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:59:11,032 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:59:13,688 INFO L134 CoverageAnalysis]: Checked inductivity of 4656 backedges. 3480 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:59:13,688 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1216002796] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:59:13,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1479812025] [2022-12-14 08:59:13,689 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:59:13,689 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:59:13,689 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:59:13,689 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:59:13,689 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:59:13,739 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:59:14,283 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '109171#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:59:14,283 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:59:14,283 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:59:14,283 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [99, 99, 99] total 150 [2022-12-14 08:59:14,283 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2065087414] [2022-12-14 08:59:14,284 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:59:14,284 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 151 states [2022-12-14 08:59:14,284 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:59:14,285 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 151 interpolants. [2022-12-14 08:59:14,286 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5119, Invalid=19061, Unknown=0, NotChecked=0, Total=24180 [2022-12-14 08:59:14,286 INFO L87 Difference]: Start difference. First operand 198 states and 199 transitions. Second operand has 151 states, 151 states have (on average 2.3112582781456954) internal successors, (349), 150 states have internal predecessors, (349), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:59:15,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:59:15,911 INFO L93 Difference]: Finished difference Result 349 states and 351 transitions. [2022-12-14 08:59:15,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2022-12-14 08:59:15,911 INFO L78 Accepts]: Start accepts. Automaton has has 151 states, 151 states have (on average 2.3112582781456954) internal successors, (349), 150 states have internal predecessors, (349), 0 states have call successors, (0), 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 197 [2022-12-14 08:59:15,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:59:15,912 INFO L225 Difference]: With dead ends: 349 [2022-12-14 08:59:15,912 INFO L226 Difference]: Without dead ends: 199 [2022-12-14 08:59:15,913 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 737 GetRequests, 437 SyntacticMatches, 97 SemanticMatches, 203 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15761 ImplicationChecksByTransitivity, 8.7s TimeCoverageRelationStatistics Valid=8845, Invalid=32975, Unknown=0, NotChecked=0, Total=41820 [2022-12-14 08:59:15,914 INFO L413 NwaCegarLoop]: 50 mSDtfsCounter, 7 mSDsluCounter, 520 mSDsCounter, 0 mSdLazyCounter, 1147 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 570 SdHoareTripleChecker+Invalid, 1147 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1147 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 08:59:15,914 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 570 Invalid, 1147 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1147 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 08:59:15,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2022-12-14 08:59:15,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 199. [2022-12-14 08:59:15,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 199 states, 198 states have (on average 1.0101010101010102) internal successors, (200), 198 states have internal predecessors, (200), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:59:15,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 200 transitions. [2022-12-14 08:59:15,964 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 200 transitions. Word has length 197 [2022-12-14 08:59:15,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:59:15,964 INFO L495 AbstractCegarLoop]: Abstraction has 199 states and 200 transitions. [2022-12-14 08:59:15,964 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 151 states, 151 states have (on average 2.3112582781456954) internal successors, (349), 150 states have internal predecessors, (349), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:59:15,964 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 200 transitions. [2022-12-14 08:59:15,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 199 [2022-12-14 08:59:15,964 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:59:15,964 INFO L195 NwaCegarLoop]: trace histogram [49, 49, 48, 48, 1, 1, 1, 1] [2022-12-14 08:59:15,969 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (97)] Forceful destruction successful, exit code 0 [2022-12-14 08:59:16,165 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 97 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable96 [2022-12-14 08:59:16,166 INFO L420 AbstractCegarLoop]: === Iteration 98 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:59:16,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:59:16,167 INFO L85 PathProgramCache]: Analyzing trace with hash 1920210895, now seen corresponding path program 96 times [2022-12-14 08:59:16,167 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:59:16,167 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1797983980] [2022-12-14 08:59:16,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:59:16,168 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:59:16,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:59:18,131 INFO L134 CoverageAnalysis]: Checked inductivity of 4705 backedges. 1176 proven. 3529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:59:18,131 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:59:18,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1797983980] [2022-12-14 08:59:18,131 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1797983980] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:59:18,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [146587870] [2022-12-14 08:59:18,131 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:59:18,132 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:59:18,132 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:59:18,132 INFO L229 MonitoredProcess]: Starting monitored process 98 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:59:18,133 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (98)] Waiting until timeout for monitored process [2022-12-14 08:59:18,239 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:59:18,239 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:59:18,245 INFO L263 TraceCheckSpWp]: Trace formula consists of 763 conjuncts, 104 conjunts are in the unsatisfiable core [2022-12-14 08:59:18,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:59:18,418 INFO L134 CoverageAnalysis]: Checked inductivity of 4705 backedges. 1225 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:59:18,418 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:59:19,871 INFO L134 CoverageAnalysis]: Checked inductivity of 4705 backedges. 1225 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:59:19,871 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [146587870] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:59:19,872 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [766652107] [2022-12-14 08:59:19,872 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:59:19,872 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:59:19,872 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:59:19,873 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:59:19,873 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:59:19,922 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:59:20,155 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '111452#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:59:20,155 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:59:20,155 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:59:20,155 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 54 [2022-12-14 08:59:20,155 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1294929529] [2022-12-14 08:59:20,155 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:59:20,155 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2022-12-14 08:59:20,156 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:59:20,156 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2022-12-14 08:59:20,156 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1355, Invalid=2185, Unknown=0, NotChecked=0, Total=3540 [2022-12-14 08:59:20,157 INFO L87 Difference]: Start difference. First operand 199 states and 200 transitions. Second operand has 55 states, 55 states have (on average 3.672727272727273) internal successors, (202), 54 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) [2022-12-14 08:59:21,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:59:21,028 INFO L93 Difference]: Finished difference Result 210 states and 211 transitions. [2022-12-14 08:59:21,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 105 states. [2022-12-14 08:59:21,028 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 3.672727272727273) internal successors, (202), 54 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 198 [2022-12-14 08:59:21,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:59:21,030 INFO L225 Difference]: With dead ends: 210 [2022-12-14 08:59:21,030 INFO L226 Difference]: Without dead ends: 208 [2022-12-14 08:59:21,030 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 743 GetRequests, 536 SyntacticMatches, 98 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5690 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=4112, Invalid=8098, Unknown=0, NotChecked=0, Total=12210 [2022-12-14 08:59:21,030 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 206 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 481 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 206 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 484 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 481 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:59:21,031 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [206 Valid, 17 Invalid, 484 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 481 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:59:21,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2022-12-14 08:59:21,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 202. [2022-12-14 08:59:21,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 201 states have (on average 1.0099502487562189) internal successors, (203), 201 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:59:21,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 203 transitions. [2022-12-14 08:59:21,094 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 203 transitions. Word has length 198 [2022-12-14 08:59:21,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:59:21,094 INFO L495 AbstractCegarLoop]: Abstraction has 202 states and 203 transitions. [2022-12-14 08:59:21,094 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 3.672727272727273) internal successors, (202), 54 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) [2022-12-14 08:59:21,094 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 203 transitions. [2022-12-14 08:59:21,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2022-12-14 08:59:21,095 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:59:21,095 INFO L195 NwaCegarLoop]: trace histogram [50, 49, 49, 49, 1, 1, 1, 1] [2022-12-14 08:59:21,100 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (98)] Ended with exit code 0 [2022-12-14 08:59:21,295 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable97,98 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:59:21,296 INFO L420 AbstractCegarLoop]: === Iteration 99 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:59:21,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:59:21,297 INFO L85 PathProgramCache]: Analyzing trace with hash 338177802, now seen corresponding path program 97 times [2022-12-14 08:59:21,297 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:59:21,297 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [786095856] [2022-12-14 08:59:21,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:59:21,298 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:59:21,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:59:24,731 INFO L134 CoverageAnalysis]: Checked inductivity of 4851 backedges. 3481 proven. 1370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:59:24,731 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:59:24,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [786095856] [2022-12-14 08:59:24,731 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [786095856] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:59:24,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1218475660] [2022-12-14 08:59:24,731 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:59:24,732 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:59:24,732 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:59:24,732 INFO L229 MonitoredProcess]: Starting monitored process 99 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:59:24,733 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (99)] Waiting until timeout for monitored process [2022-12-14 08:59:24,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:59:24,860 INFO L263 TraceCheckSpWp]: Trace formula consists of 773 conjuncts, 102 conjunts are in the unsatisfiable core [2022-12-14 08:59:24,862 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:59:27,671 INFO L134 CoverageAnalysis]: Checked inductivity of 4851 backedges. 3626 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:59:27,671 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:59:29,887 INFO L134 CoverageAnalysis]: Checked inductivity of 4851 backedges. 3626 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:59:29,887 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1218475660] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:59:29,887 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [714347559] [2022-12-14 08:59:29,887 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:59:29,887 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:59:29,888 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:59:29,888 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:59:29,888 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:59:29,932 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:59:30,516 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '113626#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:59:30,516 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:59:30,517 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:59:30,517 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [101, 101, 101] total 153 [2022-12-14 08:59:30,517 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [9922189] [2022-12-14 08:59:30,517 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:59:30,518 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 154 states [2022-12-14 08:59:30,518 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:59:30,520 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 154 interpolants. [2022-12-14 08:59:30,521 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5323, Invalid=19799, Unknown=0, NotChecked=0, Total=25122 [2022-12-14 08:59:30,521 INFO L87 Difference]: Start difference. First operand 202 states and 203 transitions. Second operand has 154 states, 154 states have (on average 2.311688311688312) internal successors, (356), 153 states have internal predecessors, (356), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:59:32,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:59:32,701 INFO L93 Difference]: Finished difference Result 356 states and 358 transitions. [2022-12-14 08:59:32,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2022-12-14 08:59:32,701 INFO L78 Accepts]: Start accepts. Automaton has has 154 states, 154 states have (on average 2.311688311688312) internal successors, (356), 153 states have internal predecessors, (356), 0 states have call successors, (0), 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 201 [2022-12-14 08:59:32,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:59:32,702 INFO L225 Difference]: With dead ends: 356 [2022-12-14 08:59:32,702 INFO L226 Difference]: Without dead ends: 203 [2022-12-14 08:59:32,703 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 752 GetRequests, 446 SyntacticMatches, 99 SemanticMatches, 207 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16383 ImplicationChecksByTransitivity, 8.7s TimeCoverageRelationStatistics Valid=9200, Invalid=34272, Unknown=0, NotChecked=0, Total=43472 [2022-12-14 08:59:32,703 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 7 mSDsluCounter, 513 mSDsCounter, 0 mSdLazyCounter, 1141 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 564 SdHoareTripleChecker+Invalid, 1141 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1141 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 08:59:32,703 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 564 Invalid, 1141 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1141 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 08:59:32,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 203 states. [2022-12-14 08:59:32,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 203 to 203. [2022-12-14 08:59:32,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 203 states, 202 states have (on average 1.00990099009901) internal successors, (204), 202 states have internal predecessors, (204), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:59:32,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203 states to 203 states and 204 transitions. [2022-12-14 08:59:32,755 INFO L78 Accepts]: Start accepts. Automaton has 203 states and 204 transitions. Word has length 201 [2022-12-14 08:59:32,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:59:32,755 INFO L495 AbstractCegarLoop]: Abstraction has 203 states and 204 transitions. [2022-12-14 08:59:32,756 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 154 states, 154 states have (on average 2.311688311688312) internal successors, (356), 153 states have internal predecessors, (356), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:59:32,756 INFO L276 IsEmpty]: Start isEmpty. Operand 203 states and 204 transitions. [2022-12-14 08:59:32,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 203 [2022-12-14 08:59:32,756 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:59:32,756 INFO L195 NwaCegarLoop]: trace histogram [50, 50, 49, 49, 1, 1, 1, 1] [2022-12-14 08:59:32,761 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (99)] Ended with exit code 0 [2022-12-14 08:59:32,956 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable98,99 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:59:32,957 INFO L420 AbstractCegarLoop]: === Iteration 100 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:59:32,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:59:32,958 INFO L85 PathProgramCache]: Analyzing trace with hash 1032160389, now seen corresponding path program 98 times [2022-12-14 08:59:32,958 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:59:32,958 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1189715674] [2022-12-14 08:59:32,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:59:32,959 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:59:33,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:59:34,898 INFO L134 CoverageAnalysis]: Checked inductivity of 4901 backedges. 1225 proven. 3676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:59:34,898 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:59:34,898 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1189715674] [2022-12-14 08:59:34,898 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1189715674] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:59:34,898 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [898794143] [2022-12-14 08:59:34,898 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:59:34,898 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:59:34,899 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:59:34,899 INFO L229 MonitoredProcess]: Starting monitored process 100 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:59:34,900 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (100)] Waiting until timeout for monitored process [2022-12-14 08:59:35,175 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 50 check-sat command(s) [2022-12-14 08:59:35,175 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:59:35,180 INFO L263 TraceCheckSpWp]: Trace formula consists of 778 conjuncts, 106 conjunts are in the unsatisfiable core [2022-12-14 08:59:35,182 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:59:35,341 INFO L134 CoverageAnalysis]: Checked inductivity of 4901 backedges. 1275 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:59:35,341 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:59:36,720 INFO L134 CoverageAnalysis]: Checked inductivity of 4901 backedges. 1275 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:59:36,720 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [898794143] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:59:36,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1373644569] [2022-12-14 08:59:36,721 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:59:36,721 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:59:36,721 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:59:36,721 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:59:36,721 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:59:36,763 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:59:37,095 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '115953#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:59:37,095 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:59:37,095 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:59:37,095 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 55 [2022-12-14 08:59:37,096 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1402470381] [2022-12-14 08:59:37,096 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:59:37,100 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2022-12-14 08:59:37,101 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:59:37,101 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2022-12-14 08:59:37,102 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1407, Invalid=2253, Unknown=0, NotChecked=0, Total=3660 [2022-12-14 08:59:37,102 INFO L87 Difference]: Start difference. First operand 203 states and 204 transitions. Second operand has 56 states, 56 states have (on average 3.6785714285714284) internal successors, (206), 55 states have internal predecessors, (206), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:59:37,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:59:37,991 INFO L93 Difference]: Finished difference Result 214 states and 215 transitions. [2022-12-14 08:59:37,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 107 states. [2022-12-14 08:59:37,991 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 3.6785714285714284) internal successors, (206), 55 states have internal predecessors, (206), 0 states have call successors, (0), 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 202 [2022-12-14 08:59:37,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:59:37,991 INFO L225 Difference]: With dead ends: 214 [2022-12-14 08:59:37,991 INFO L226 Difference]: Without dead ends: 212 [2022-12-14 08:59:37,992 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 758 GetRequests, 547 SyntacticMatches, 100 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5906 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=4270, Invalid=8386, Unknown=0, NotChecked=0, Total=12656 [2022-12-14 08:59:37,993 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 210 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 509 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 210 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 512 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 509 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:59:37,993 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [210 Valid, 17 Invalid, 512 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 509 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:59:37,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2022-12-14 08:59:38,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 206. [2022-12-14 08:59:38,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 206 states, 205 states have (on average 1.0097560975609756) internal successors, (207), 205 states have internal predecessors, (207), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:59:38,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 207 transitions. [2022-12-14 08:59:38,053 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 207 transitions. Word has length 202 [2022-12-14 08:59:38,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:59:38,054 INFO L495 AbstractCegarLoop]: Abstraction has 206 states and 207 transitions. [2022-12-14 08:59:38,054 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 3.6785714285714284) internal successors, (206), 55 states have internal predecessors, (206), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:59:38,054 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 207 transitions. [2022-12-14 08:59:38,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2022-12-14 08:59:38,054 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:59:38,054 INFO L195 NwaCegarLoop]: trace histogram [51, 50, 50, 50, 1, 1, 1, 1] [2022-12-14 08:59:38,059 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (100)] Ended with exit code 0 [2022-12-14 08:59:38,255 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable99,100 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:59:38,255 INFO L420 AbstractCegarLoop]: === Iteration 101 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:59:38,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:59:38,256 INFO L85 PathProgramCache]: Analyzing trace with hash 1424096916, now seen corresponding path program 99 times [2022-12-14 08:59:38,256 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:59:38,257 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [108665279] [2022-12-14 08:59:38,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:59:38,257 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:59:38,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:59:41,865 INFO L134 CoverageAnalysis]: Checked inductivity of 5050 backedges. 3627 proven. 1423 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:59:41,865 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:59:41,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [108665279] [2022-12-14 08:59:41,865 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [108665279] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:59:41,866 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1294705607] [2022-12-14 08:59:41,866 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:59:41,866 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:59:41,866 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:59:41,867 INFO L229 MonitoredProcess]: Starting monitored process 101 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:59:41,872 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (101)] Waiting until timeout for monitored process [2022-12-14 08:59:41,965 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:59:41,965 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:59:41,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 788 conjuncts, 104 conjunts are in the unsatisfiable core [2022-12-14 08:59:41,974 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:59:45,050 INFO L134 CoverageAnalysis]: Checked inductivity of 5050 backedges. 3775 proven. 1275 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:59:45,051 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:59:47,509 INFO L134 CoverageAnalysis]: Checked inductivity of 5050 backedges. 3775 proven. 1275 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:59:47,509 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1294705607] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:59:47,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2110358629] [2022-12-14 08:59:47,510 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:59:47,510 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:59:47,510 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:59:47,510 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:59:47,510 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:59:47,552 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:59:48,160 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '118170#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:59:48,160 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:59:48,160 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:59:48,160 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [103, 103, 103] total 156 [2022-12-14 08:59:48,160 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1853070203] [2022-12-14 08:59:48,160 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:59:48,161 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 157 states [2022-12-14 08:59:48,161 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:59:48,162 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 157 interpolants. [2022-12-14 08:59:48,163 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5531, Invalid=20551, Unknown=0, NotChecked=0, Total=26082 [2022-12-14 08:59:48,163 INFO L87 Difference]: Start difference. First operand 206 states and 207 transitions. Second operand has 157 states, 157 states have (on average 2.3121019108280256) internal successors, (363), 156 states have internal predecessors, (363), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:59:50,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:59:50,275 INFO L93 Difference]: Finished difference Result 363 states and 365 transitions. [2022-12-14 08:59:50,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2022-12-14 08:59:50,275 INFO L78 Accepts]: Start accepts. Automaton has has 157 states, 157 states have (on average 2.3121019108280256) internal successors, (363), 156 states have internal predecessors, (363), 0 states have call successors, (0), 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 205 [2022-12-14 08:59:50,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:59:50,276 INFO L225 Difference]: With dead ends: 363 [2022-12-14 08:59:50,276 INFO L226 Difference]: Without dead ends: 207 [2022-12-14 08:59:50,277 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 767 GetRequests, 455 SyntacticMatches, 101 SemanticMatches, 211 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17017 ImplicationChecksByTransitivity, 9.3s TimeCoverageRelationStatistics Valid=9562, Invalid=35594, Unknown=0, NotChecked=0, Total=45156 [2022-12-14 08:59:50,277 INFO L413 NwaCegarLoop]: 52 mSDtfsCounter, 7 mSDsluCounter, 510 mSDsCounter, 0 mSdLazyCounter, 1144 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 562 SdHoareTripleChecker+Invalid, 1144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1144 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 08:59:50,278 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 562 Invalid, 1144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1144 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 08:59:50,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2022-12-14 08:59:50,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 207. [2022-12-14 08:59:50,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 206 states have (on average 1.0097087378640777) internal successors, (208), 206 states have internal predecessors, (208), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:59:50,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 208 transitions. [2022-12-14 08:59:50,332 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 208 transitions. Word has length 205 [2022-12-14 08:59:50,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:59:50,332 INFO L495 AbstractCegarLoop]: Abstraction has 207 states and 208 transitions. [2022-12-14 08:59:50,332 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 157 states, 157 states have (on average 2.3121019108280256) internal successors, (363), 156 states have internal predecessors, (363), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:59:50,332 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 208 transitions. [2022-12-14 08:59:50,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2022-12-14 08:59:50,332 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:59:50,332 INFO L195 NwaCegarLoop]: trace histogram [51, 51, 50, 50, 1, 1, 1, 1] [2022-12-14 08:59:50,337 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (101)] Ended with exit code 0 [2022-12-14 08:59:50,533 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 101 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable100 [2022-12-14 08:59:50,533 INFO L420 AbstractCegarLoop]: === Iteration 102 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:59:50,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:59:50,534 INFO L85 PathProgramCache]: Analyzing trace with hash 1012014735, now seen corresponding path program 100 times [2022-12-14 08:59:50,535 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:59:50,535 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1375144215] [2022-12-14 08:59:50,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:59:50,535 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:59:50,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:59:52,652 INFO L134 CoverageAnalysis]: Checked inductivity of 5101 backedges. 1275 proven. 3826 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:59:52,652 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:59:52,652 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1375144215] [2022-12-14 08:59:52,652 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1375144215] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:59:52,652 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2122432885] [2022-12-14 08:59:52,652 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:59:52,652 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:59:52,652 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:59:52,653 INFO L229 MonitoredProcess]: Starting monitored process 102 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:59:52,653 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (102)] Waiting until timeout for monitored process [2022-12-14 08:59:52,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:59:52,790 INFO L263 TraceCheckSpWp]: Trace formula consists of 793 conjuncts, 108 conjunts are in the unsatisfiable core [2022-12-14 08:59:52,793 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:59:52,980 INFO L134 CoverageAnalysis]: Checked inductivity of 5101 backedges. 1326 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:59:52,981 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:59:54,551 INFO L134 CoverageAnalysis]: Checked inductivity of 5101 backedges. 1326 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:59:54,551 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2122432885] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:59:54,551 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1576067418] [2022-12-14 08:59:54,552 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 08:59:54,552 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:59:54,552 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:59:54,552 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:59:54,552 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:59:54,590 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:59:54,813 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '120543#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 08:59:54,813 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:59:54,813 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:59:54,814 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 56 [2022-12-14 08:59:54,814 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1133743758] [2022-12-14 08:59:54,814 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:59:54,814 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2022-12-14 08:59:54,814 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:59:54,814 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2022-12-14 08:59:54,815 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1460, Invalid=2322, Unknown=0, NotChecked=0, Total=3782 [2022-12-14 08:59:54,815 INFO L87 Difference]: Start difference. First operand 207 states and 208 transitions. Second operand has 57 states, 57 states have (on average 3.6842105263157894) internal successors, (210), 56 states have internal predecessors, (210), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:59:55,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:59:55,720 INFO L93 Difference]: Finished difference Result 218 states and 219 transitions. [2022-12-14 08:59:55,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 109 states. [2022-12-14 08:59:55,720 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 3.6842105263157894) internal successors, (210), 56 states have internal predecessors, (210), 0 states have call successors, (0), 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 206 [2022-12-14 08:59:55,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:59:55,721 INFO L225 Difference]: With dead ends: 218 [2022-12-14 08:59:55,721 INFO L226 Difference]: Without dead ends: 216 [2022-12-14 08:59:55,722 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 773 GetRequests, 558 SyntacticMatches, 102 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6126 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=4431, Invalid=8679, Unknown=0, NotChecked=0, Total=13110 [2022-12-14 08:59:55,722 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 214 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 559 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 214 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 562 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 559 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:59:55,722 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [214 Valid, 17 Invalid, 562 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 559 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:59:55,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2022-12-14 08:59:55,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 210. [2022-12-14 08:59:55,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 210 states, 209 states have (on average 1.0095693779904307) internal successors, (211), 209 states have internal predecessors, (211), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:59:55,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 211 transitions. [2022-12-14 08:59:55,783 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 211 transitions. Word has length 206 [2022-12-14 08:59:55,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:59:55,783 INFO L495 AbstractCegarLoop]: Abstraction has 210 states and 211 transitions. [2022-12-14 08:59:55,783 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 3.6842105263157894) internal successors, (210), 56 states have internal predecessors, (210), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:59:55,783 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 211 transitions. [2022-12-14 08:59:55,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2022-12-14 08:59:55,784 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:59:55,784 INFO L195 NwaCegarLoop]: trace histogram [52, 51, 51, 51, 1, 1, 1, 1] [2022-12-14 08:59:55,788 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (102)] Ended with exit code 0 [2022-12-14 08:59:55,984 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 102 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable101 [2022-12-14 08:59:55,985 INFO L420 AbstractCegarLoop]: === Iteration 103 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:59:55,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:59:55,986 INFO L85 PathProgramCache]: Analyzing trace with hash -1734627254, now seen corresponding path program 101 times [2022-12-14 08:59:55,986 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:59:55,986 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [97169695] [2022-12-14 08:59:55,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:59:55,987 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:59:56,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:59:59,570 INFO L134 CoverageAnalysis]: Checked inductivity of 5253 backedges. 3776 proven. 1477 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:59:59,570 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:59:59,570 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [97169695] [2022-12-14 08:59:59,570 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [97169695] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:59:59,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1343238236] [2022-12-14 08:59:59,571 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:59:59,571 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:59:59,571 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:59:59,571 INFO L229 MonitoredProcess]: Starting monitored process 103 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:59:59,572 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (103)] Waiting until timeout for monitored process [2022-12-14 08:59:59,864 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 52 check-sat command(s) [2022-12-14 08:59:59,864 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:59:59,870 INFO L263 TraceCheckSpWp]: Trace formula consists of 803 conjuncts, 106 conjunts are in the unsatisfiable core [2022-12-14 08:59:59,872 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:00:02,738 INFO L134 CoverageAnalysis]: Checked inductivity of 5253 backedges. 3927 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:00:02,738 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:00:05,069 INFO L134 CoverageAnalysis]: Checked inductivity of 5253 backedges. 3927 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:00:05,069 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1343238236] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:00:05,069 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [144602381] [2022-12-14 09:00:05,070 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 09:00:05,070 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:00:05,070 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:00:05,070 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:00:05,070 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:00:05,110 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:00:05,556 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '122803#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:00:05,557 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:00:05,557 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:00:05,557 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [105, 105, 105] total 159 [2022-12-14 09:00:05,557 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1906216531] [2022-12-14 09:00:05,557 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:00:05,558 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 160 states [2022-12-14 09:00:05,558 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:00:05,559 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 160 interpolants. [2022-12-14 09:00:05,561 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5743, Invalid=21317, Unknown=0, NotChecked=0, Total=27060 [2022-12-14 09:00:05,561 INFO L87 Difference]: Start difference. First operand 210 states and 211 transitions. Second operand has 160 states, 160 states have (on average 2.3125) internal successors, (370), 159 states have internal predecessors, (370), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:00:07,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:00:07,612 INFO L93 Difference]: Finished difference Result 370 states and 372 transitions. [2022-12-14 09:00:07,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2022-12-14 09:00:07,612 INFO L78 Accepts]: Start accepts. Automaton has has 160 states, 160 states have (on average 2.3125) internal successors, (370), 159 states have internal predecessors, (370), 0 states have call successors, (0), 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 209 [2022-12-14 09:00:07,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:00:07,613 INFO L225 Difference]: With dead ends: 370 [2022-12-14 09:00:07,613 INFO L226 Difference]: Without dead ends: 211 [2022-12-14 09:00:07,615 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 782 GetRequests, 464 SyntacticMatches, 103 SemanticMatches, 215 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17663 ImplicationChecksByTransitivity, 8.7s TimeCoverageRelationStatistics Valid=9931, Invalid=36941, Unknown=0, NotChecked=0, Total=46872 [2022-12-14 09:00:07,615 INFO L413 NwaCegarLoop]: 53 mSDtfsCounter, 7 mSDsluCounter, 540 mSDsCounter, 0 mSdLazyCounter, 1213 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 593 SdHoareTripleChecker+Invalid, 1213 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1213 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 09:00:07,615 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 593 Invalid, 1213 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1213 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 09:00:07,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2022-12-14 09:00:07,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 211. [2022-12-14 09:00:07,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 211 states, 210 states have (on average 1.0095238095238095) internal successors, (212), 210 states have internal predecessors, (212), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:00:07,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 212 transitions. [2022-12-14 09:00:07,682 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 212 transitions. Word has length 209 [2022-12-14 09:00:07,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:00:07,682 INFO L495 AbstractCegarLoop]: Abstraction has 211 states and 212 transitions. [2022-12-14 09:00:07,683 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 160 states, 160 states have (on average 2.3125) internal successors, (370), 159 states have internal predecessors, (370), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:00:07,683 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 212 transitions. [2022-12-14 09:00:07,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 211 [2022-12-14 09:00:07,683 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:00:07,684 INFO L195 NwaCegarLoop]: trace histogram [52, 52, 51, 51, 1, 1, 1, 1] [2022-12-14 09:00:07,689 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (103)] Ended with exit code 0 [2022-12-14 09:00:07,884 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable102,103 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:00:07,884 INFO L420 AbstractCegarLoop]: === Iteration 104 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:00:07,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:00:07,885 INFO L85 PathProgramCache]: Analyzing trace with hash 179657413, now seen corresponding path program 102 times [2022-12-14 09:00:07,885 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:00:07,885 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [215021862] [2022-12-14 09:00:07,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:00:07,885 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:00:07,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:00:10,089 INFO L134 CoverageAnalysis]: Checked inductivity of 5305 backedges. 1326 proven. 3979 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:00:10,089 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:00:10,089 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [215021862] [2022-12-14 09:00:10,089 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [215021862] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:00:10,089 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [25450088] [2022-12-14 09:00:10,089 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 09:00:10,089 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:00:10,089 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:00:10,090 INFO L229 MonitoredProcess]: Starting monitored process 104 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:00:10,090 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (104)] Waiting until timeout for monitored process [2022-12-14 09:00:10,202 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 09:00:10,202 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:00:10,209 INFO L263 TraceCheckSpWp]: Trace formula consists of 808 conjuncts, 110 conjunts are in the unsatisfiable core [2022-12-14 09:00:10,213 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:00:10,392 INFO L134 CoverageAnalysis]: Checked inductivity of 5305 backedges. 1378 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:00:10,392 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:00:12,075 INFO L134 CoverageAnalysis]: Checked inductivity of 5305 backedges. 1378 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:00:12,075 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [25450088] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:00:12,075 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1212391243] [2022-12-14 09:00:12,076 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 09:00:12,076 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:00:12,076 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:00:12,076 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:00:12,076 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:00:12,118 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:00:12,314 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '125222#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:00:12,315 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:00:12,315 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:00:12,315 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 57 [2022-12-14 09:00:12,315 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [793787269] [2022-12-14 09:00:12,315 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:00:12,315 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2022-12-14 09:00:12,315 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:00:12,316 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2022-12-14 09:00:12,316 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1514, Invalid=2392, Unknown=0, NotChecked=0, Total=3906 [2022-12-14 09:00:12,316 INFO L87 Difference]: Start difference. First operand 211 states and 212 transitions. Second operand has 58 states, 58 states have (on average 3.689655172413793) internal successors, (214), 57 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) [2022-12-14 09:00:13,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:00:13,195 INFO L93 Difference]: Finished difference Result 222 states and 223 transitions. [2022-12-14 09:00:13,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 111 states. [2022-12-14 09:00:13,196 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 3.689655172413793) internal successors, (214), 57 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 210 [2022-12-14 09:00:13,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:00:13,196 INFO L225 Difference]: With dead ends: 222 [2022-12-14 09:00:13,196 INFO L226 Difference]: Without dead ends: 220 [2022-12-14 09:00:13,197 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 788 GetRequests, 569 SyntacticMatches, 104 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6350 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=4595, Invalid=8977, Unknown=0, NotChecked=0, Total=13572 [2022-12-14 09:00:13,197 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 218 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 547 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 218 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 550 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 547 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 09:00:13,197 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [218 Valid, 21 Invalid, 550 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 547 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 09:00:13,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2022-12-14 09:00:13,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 214. [2022-12-14 09:00:13,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 214 states, 213 states have (on average 1.0093896713615023) internal successors, (215), 213 states have internal predecessors, (215), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:00:13,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 215 transitions. [2022-12-14 09:00:13,260 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 215 transitions. Word has length 210 [2022-12-14 09:00:13,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:00:13,260 INFO L495 AbstractCegarLoop]: Abstraction has 214 states and 215 transitions. [2022-12-14 09:00:13,260 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 3.689655172413793) internal successors, (214), 57 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) [2022-12-14 09:00:13,260 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 215 transitions. [2022-12-14 09:00:13,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2022-12-14 09:00:13,261 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:00:13,261 INFO L195 NwaCegarLoop]: trace histogram [53, 52, 52, 52, 1, 1, 1, 1] [2022-12-14 09:00:13,265 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (104)] Ended with exit code 0 [2022-12-14 09:00:13,461 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 104 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable103 [2022-12-14 09:00:13,462 INFO L420 AbstractCegarLoop]: === Iteration 105 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:00:13,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:00:13,462 INFO L85 PathProgramCache]: Analyzing trace with hash 649560148, now seen corresponding path program 103 times [2022-12-14 09:00:13,463 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:00:13,463 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [703021854] [2022-12-14 09:00:13,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:00:13,464 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:00:13,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:00:17,215 INFO L134 CoverageAnalysis]: Checked inductivity of 5460 backedges. 3928 proven. 1532 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:00:17,216 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:00:17,216 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [703021854] [2022-12-14 09:00:17,216 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [703021854] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:00:17,216 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [77171108] [2022-12-14 09:00:17,216 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 09:00:17,216 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:00:17,216 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:00:17,217 INFO L229 MonitoredProcess]: Starting monitored process 105 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:00:17,218 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (105)] Waiting until timeout for monitored process [2022-12-14 09:00:17,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:00:17,320 INFO L263 TraceCheckSpWp]: Trace formula consists of 818 conjuncts, 108 conjunts are in the unsatisfiable core [2022-12-14 09:00:17,324 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:00:20,722 INFO L134 CoverageAnalysis]: Checked inductivity of 5460 backedges. 4082 proven. 1378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:00:20,722 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:00:23,318 INFO L134 CoverageAnalysis]: Checked inductivity of 5460 backedges. 4082 proven. 1378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:00:23,319 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [77171108] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:00:23,319 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [149314324] [2022-12-14 09:00:23,319 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 09:00:23,319 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:00:23,319 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:00:23,320 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:00:23,320 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:00:23,360 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:00:24,006 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '127525#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:00:24,006 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:00:24,006 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:00:24,006 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [107, 107, 107] total 162 [2022-12-14 09:00:24,006 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [302233148] [2022-12-14 09:00:24,006 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:00:24,007 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 163 states [2022-12-14 09:00:24,007 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:00:24,008 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 163 interpolants. [2022-12-14 09:00:24,009 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5959, Invalid=22097, Unknown=0, NotChecked=0, Total=28056 [2022-12-14 09:00:24,010 INFO L87 Difference]: Start difference. First operand 214 states and 215 transitions. Second operand has 163 states, 163 states have (on average 2.312883435582822) internal successors, (377), 162 states have internal predecessors, (377), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:00:26,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:00:26,000 INFO L93 Difference]: Finished difference Result 377 states and 379 transitions. [2022-12-14 09:00:26,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2022-12-14 09:00:26,000 INFO L78 Accepts]: Start accepts. Automaton has has 163 states, 163 states have (on average 2.312883435582822) internal successors, (377), 162 states have internal predecessors, (377), 0 states have call successors, (0), 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 213 [2022-12-14 09:00:26,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:00:26,001 INFO L225 Difference]: With dead ends: 377 [2022-12-14 09:00:26,001 INFO L226 Difference]: Without dead ends: 215 [2022-12-14 09:00:26,003 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 797 GetRequests, 473 SyntacticMatches, 105 SemanticMatches, 219 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18321 ImplicationChecksByTransitivity, 9.8s TimeCoverageRelationStatistics Valid=10307, Invalid=38313, Unknown=0, NotChecked=0, Total=48620 [2022-12-14 09:00:26,003 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 7 mSDsluCounter, 526 mSDsCounter, 0 mSdLazyCounter, 1184 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 580 SdHoareTripleChecker+Invalid, 1184 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1184 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 09:00:26,003 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 580 Invalid, 1184 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1184 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 09:00:26,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2022-12-14 09:00:26,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 215. [2022-12-14 09:00:26,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 215 states, 214 states have (on average 1.0093457943925233) internal successors, (216), 214 states have internal predecessors, (216), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:00:26,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 216 transitions. [2022-12-14 09:00:26,062 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 216 transitions. Word has length 213 [2022-12-14 09:00:26,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:00:26,062 INFO L495 AbstractCegarLoop]: Abstraction has 215 states and 216 transitions. [2022-12-14 09:00:26,062 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 163 states, 163 states have (on average 2.312883435582822) internal successors, (377), 162 states have internal predecessors, (377), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:00:26,062 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 216 transitions. [2022-12-14 09:00:26,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 215 [2022-12-14 09:00:26,063 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:00:26,063 INFO L195 NwaCegarLoop]: trace histogram [53, 53, 52, 52, 1, 1, 1, 1] [2022-12-14 09:00:26,067 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (105)] Ended with exit code 0 [2022-12-14 09:00:26,264 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 105 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable104 [2022-12-14 09:00:26,265 INFO L420 AbstractCegarLoop]: === Iteration 106 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:00:26,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:00:26,265 INFO L85 PathProgramCache]: Analyzing trace with hash 1186035023, now seen corresponding path program 104 times [2022-12-14 09:00:26,266 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:00:26,266 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1368975974] [2022-12-14 09:00:26,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:00:26,266 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:00:26,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:00:28,551 INFO L134 CoverageAnalysis]: Checked inductivity of 5513 backedges. 1378 proven. 4135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:00:28,551 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:00:28,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1368975974] [2022-12-14 09:00:28,552 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1368975974] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:00:28,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [167835985] [2022-12-14 09:00:28,552 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 09:00:28,552 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:00:28,552 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:00:28,553 INFO L229 MonitoredProcess]: Starting monitored process 106 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:00:28,553 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (106)] Waiting until timeout for monitored process [2022-12-14 09:00:28,767 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 53 check-sat command(s) [2022-12-14 09:00:28,767 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:00:28,772 INFO L263 TraceCheckSpWp]: Trace formula consists of 823 conjuncts, 112 conjunts are in the unsatisfiable core [2022-12-14 09:00:28,774 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:00:28,972 INFO L134 CoverageAnalysis]: Checked inductivity of 5513 backedges. 1431 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:00:28,972 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:00:30,831 INFO L134 CoverageAnalysis]: Checked inductivity of 5513 backedges. 1431 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:00:30,831 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [167835985] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:00:30,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1529763719] [2022-12-14 09:00:30,832 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 09:00:30,832 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:00:30,832 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:00:30,832 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:00:30,832 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:00:30,869 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:00:31,187 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '129990#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:00:31,187 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:00:31,187 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:00:31,187 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 58 [2022-12-14 09:00:31,187 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1319302336] [2022-12-14 09:00:31,187 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:00:31,187 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2022-12-14 09:00:31,187 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:00:31,188 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2022-12-14 09:00:31,188 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1569, Invalid=2463, Unknown=0, NotChecked=0, Total=4032 [2022-12-14 09:00:31,188 INFO L87 Difference]: Start difference. First operand 215 states and 216 transitions. Second operand has 59 states, 59 states have (on average 3.694915254237288) internal successors, (218), 58 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:00:32,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:00:32,137 INFO L93 Difference]: Finished difference Result 226 states and 227 transitions. [2022-12-14 09:00:32,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2022-12-14 09:00:32,137 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 3.694915254237288) internal successors, (218), 58 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 214 [2022-12-14 09:00:32,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:00:32,138 INFO L225 Difference]: With dead ends: 226 [2022-12-14 09:00:32,138 INFO L226 Difference]: Without dead ends: 224 [2022-12-14 09:00:32,138 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 803 GetRequests, 580 SyntacticMatches, 106 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6578 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=4762, Invalid=9280, Unknown=0, NotChecked=0, Total=14042 [2022-12-14 09:00:32,139 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 220 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 507 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 220 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 510 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 507 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 09:00:32,139 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [220 Valid, 13 Invalid, 510 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 507 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 09:00:32,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2022-12-14 09:00:32,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 218. [2022-12-14 09:00:32,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 218 states, 217 states have (on average 1.0092165898617511) internal successors, (219), 217 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:00:32,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 219 transitions. [2022-12-14 09:00:32,199 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 219 transitions. Word has length 214 [2022-12-14 09:00:32,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:00:32,200 INFO L495 AbstractCegarLoop]: Abstraction has 218 states and 219 transitions. [2022-12-14 09:00:32,200 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 3.694915254237288) internal successors, (218), 58 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:00:32,200 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 219 transitions. [2022-12-14 09:00:32,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 218 [2022-12-14 09:00:32,200 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:00:32,200 INFO L195 NwaCegarLoop]: trace histogram [54, 53, 53, 53, 1, 1, 1, 1] [2022-12-14 09:00:32,205 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (106)] Ended with exit code 0 [2022-12-14 09:00:32,401 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable105,106 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:00:32,402 INFO L420 AbstractCegarLoop]: === Iteration 107 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:00:32,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:00:32,403 INFO L85 PathProgramCache]: Analyzing trace with hash -1521753718, now seen corresponding path program 105 times [2022-12-14 09:00:32,403 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:00:32,403 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [205532263] [2022-12-14 09:00:32,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:00:32,404 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:00:32,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:00:36,397 INFO L134 CoverageAnalysis]: Checked inductivity of 5671 backedges. 4083 proven. 1588 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:00:36,398 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:00:36,398 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [205532263] [2022-12-14 09:00:36,398 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [205532263] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:00:36,398 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [912567177] [2022-12-14 09:00:36,398 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 09:00:36,398 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:00:36,398 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:00:36,399 INFO L229 MonitoredProcess]: Starting monitored process 107 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:00:36,399 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (107)] Waiting until timeout for monitored process [2022-12-14 09:00:36,519 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 09:00:36,520 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:00:36,527 INFO L263 TraceCheckSpWp]: Trace formula consists of 833 conjuncts, 110 conjunts are in the unsatisfiable core [2022-12-14 09:00:36,529 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:00:40,001 INFO L134 CoverageAnalysis]: Checked inductivity of 5671 backedges. 4240 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:00:40,001 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:00:42,935 INFO L134 CoverageAnalysis]: Checked inductivity of 5671 backedges. 4240 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:00:42,935 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [912567177] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:00:42,935 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1604276652] [2022-12-14 09:00:42,936 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 09:00:42,936 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:00:42,936 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:00:42,936 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:00:42,936 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:00:42,981 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:00:43,492 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '132336#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:00:43,492 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:00:43,492 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:00:43,493 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [109, 109, 109] total 165 [2022-12-14 09:00:43,493 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1628621834] [2022-12-14 09:00:43,493 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:00:43,493 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 166 states [2022-12-14 09:00:43,493 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:00:43,494 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 166 interpolants. [2022-12-14 09:00:43,495 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6179, Invalid=22891, Unknown=0, NotChecked=0, Total=29070 [2022-12-14 09:00:43,495 INFO L87 Difference]: Start difference. First operand 218 states and 219 transitions. Second operand has 166 states, 166 states have (on average 2.3132530120481927) internal successors, (384), 165 states have internal predecessors, (384), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:00:45,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:00:45,983 INFO L93 Difference]: Finished difference Result 384 states and 386 transitions. [2022-12-14 09:00:45,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 110 states. [2022-12-14 09:00:45,983 INFO L78 Accepts]: Start accepts. Automaton has has 166 states, 166 states have (on average 2.3132530120481927) internal successors, (384), 165 states have internal predecessors, (384), 0 states have call successors, (0), 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 217 [2022-12-14 09:00:45,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:00:45,984 INFO L225 Difference]: With dead ends: 384 [2022-12-14 09:00:45,984 INFO L226 Difference]: Without dead ends: 219 [2022-12-14 09:00:45,986 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 812 GetRequests, 482 SyntacticMatches, 107 SemanticMatches, 223 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18991 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=10690, Invalid=39710, Unknown=0, NotChecked=0, Total=50400 [2022-12-14 09:00:45,987 INFO L413 NwaCegarLoop]: 55 mSDtfsCounter, 7 mSDsluCounter, 731 mSDsCounter, 0 mSdLazyCounter, 1599 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 786 SdHoareTripleChecker+Invalid, 1599 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1599 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-12-14 09:00:45,987 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 786 Invalid, 1599 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1599 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-12-14 09:00:45,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2022-12-14 09:00:46,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 219. [2022-12-14 09:00:46,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 219 states, 218 states have (on average 1.0091743119266054) internal successors, (220), 218 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) [2022-12-14 09:00:46,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 220 transitions. [2022-12-14 09:00:46,057 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 220 transitions. Word has length 217 [2022-12-14 09:00:46,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:00:46,057 INFO L495 AbstractCegarLoop]: Abstraction has 219 states and 220 transitions. [2022-12-14 09:00:46,058 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 166 states, 166 states have (on average 2.3132530120481927) internal successors, (384), 165 states have internal predecessors, (384), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:00:46,058 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 220 transitions. [2022-12-14 09:00:46,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 219 [2022-12-14 09:00:46,058 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:00:46,058 INFO L195 NwaCegarLoop]: trace histogram [54, 54, 53, 53, 1, 1, 1, 1] [2022-12-14 09:00:46,063 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (107)] Ended with exit code 0 [2022-12-14 09:00:46,259 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable106,107 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:00:46,259 INFO L420 AbstractCegarLoop]: === Iteration 108 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:00:46,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:00:46,260 INFO L85 PathProgramCache]: Analyzing trace with hash -1661148923, now seen corresponding path program 106 times [2022-12-14 09:00:46,260 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:00:46,260 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1398130395] [2022-12-14 09:00:46,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:00:46,261 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:00:46,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:00:48,889 INFO L134 CoverageAnalysis]: Checked inductivity of 5725 backedges. 1431 proven. 4294 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:00:48,889 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:00:48,889 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1398130395] [2022-12-14 09:00:48,889 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1398130395] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:00:48,890 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [742816698] [2022-12-14 09:00:48,890 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 09:00:48,890 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:00:48,890 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:00:48,890 INFO L229 MonitoredProcess]: Starting monitored process 108 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:00:48,891 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (108)] Waiting until timeout for monitored process [2022-12-14 09:00:48,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:00:48,999 INFO L263 TraceCheckSpWp]: Trace formula consists of 838 conjuncts, 114 conjunts are in the unsatisfiable core [2022-12-14 09:00:49,001 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:00:49,212 INFO L134 CoverageAnalysis]: Checked inductivity of 5725 backedges. 1485 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:00:49,212 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:00:51,134 INFO L134 CoverageAnalysis]: Checked inductivity of 5725 backedges. 1485 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:00:51,134 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [742816698] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:00:51,134 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1239033837] [2022-12-14 09:00:51,135 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 09:00:51,135 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:00:51,135 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:00:51,135 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:00:51,135 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:00:51,174 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:00:51,365 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '134847#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:00:51,365 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:00:51,365 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:00:51,365 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 59 [2022-12-14 09:00:51,365 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1624196992] [2022-12-14 09:00:51,365 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:00:51,365 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2022-12-14 09:00:51,365 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:00:51,366 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2022-12-14 09:00:51,366 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1625, Invalid=2535, Unknown=0, NotChecked=0, Total=4160 [2022-12-14 09:00:51,366 INFO L87 Difference]: Start difference. First operand 219 states and 220 transitions. Second operand has 60 states, 60 states have (on average 3.7) internal successors, (222), 59 states have internal predecessors, (222), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:00:52,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:00:52,556 INFO L93 Difference]: Finished difference Result 230 states and 231 transitions. [2022-12-14 09:00:52,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 115 states. [2022-12-14 09:00:52,556 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 3.7) internal successors, (222), 59 states have internal predecessors, (222), 0 states have call successors, (0), 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 218 [2022-12-14 09:00:52,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:00:52,557 INFO L225 Difference]: With dead ends: 230 [2022-12-14 09:00:52,557 INFO L226 Difference]: Without dead ends: 228 [2022-12-14 09:00:52,557 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 818 GetRequests, 591 SyntacticMatches, 108 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6810 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=4932, Invalid=9588, Unknown=0, NotChecked=0, Total=14520 [2022-12-14 09:00:52,557 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 118 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 593 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 118 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 596 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 593 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 09:00:52,558 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [118 Valid, 26 Invalid, 596 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 593 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 09:00:52,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 228 states. [2022-12-14 09:00:52,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 228 to 222. [2022-12-14 09:00:52,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 222 states, 221 states have (on average 1.009049773755656) internal successors, (223), 221 states have internal predecessors, (223), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:00:52,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 223 transitions. [2022-12-14 09:00:52,620 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 223 transitions. Word has length 218 [2022-12-14 09:00:52,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:00:52,620 INFO L495 AbstractCegarLoop]: Abstraction has 222 states and 223 transitions. [2022-12-14 09:00:52,620 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 3.7) internal successors, (222), 59 states have internal predecessors, (222), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:00:52,620 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 223 transitions. [2022-12-14 09:00:52,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 222 [2022-12-14 09:00:52,620 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:00:52,620 INFO L195 NwaCegarLoop]: trace histogram [55, 54, 54, 54, 1, 1, 1, 1] [2022-12-14 09:00:52,625 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (108)] Ended with exit code 0 [2022-12-14 09:00:52,821 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 108 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable107 [2022-12-14 09:00:52,821 INFO L420 AbstractCegarLoop]: === Iteration 109 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:00:52,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:00:52,822 INFO L85 PathProgramCache]: Analyzing trace with hash -669560300, now seen corresponding path program 107 times [2022-12-14 09:00:52,822 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:00:52,823 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [681841727] [2022-12-14 09:00:52,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:00:52,823 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:00:52,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:00:56,464 INFO L134 CoverageAnalysis]: Checked inductivity of 5886 backedges. 4241 proven. 1645 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:00:56,465 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:00:56,465 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [681841727] [2022-12-14 09:00:56,465 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [681841727] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:00:56,465 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [197796308] [2022-12-14 09:00:56,465 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 09:00:56,465 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:00:56,465 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:00:56,466 INFO L229 MonitoredProcess]: Starting monitored process 109 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:00:56,466 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (109)] Waiting until timeout for monitored process [2022-12-14 09:00:56,701 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 55 check-sat command(s) [2022-12-14 09:00:56,702 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:00:56,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 848 conjuncts, 112 conjunts are in the unsatisfiable core [2022-12-14 09:00:56,709 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:01:00,519 INFO L134 CoverageAnalysis]: Checked inductivity of 5886 backedges. 4401 proven. 1485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:01:00,519 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:01:03,335 INFO L134 CoverageAnalysis]: Checked inductivity of 5886 backedges. 4401 proven. 1485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:01:03,335 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [197796308] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:01:03,335 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [378865157] [2022-12-14 09:01:03,336 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 09:01:03,336 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:01:03,336 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:01:03,336 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:01:03,336 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:01:03,381 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:01:03,876 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '137236#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:01:03,876 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:01:03,876 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:01:03,876 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [111, 111, 111] total 168 [2022-12-14 09:01:03,876 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1436072783] [2022-12-14 09:01:03,876 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:01:03,877 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 169 states [2022-12-14 09:01:03,877 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:01:03,878 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 169 interpolants. [2022-12-14 09:01:03,879 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6403, Invalid=23699, Unknown=0, NotChecked=0, Total=30102 [2022-12-14 09:01:03,879 INFO L87 Difference]: Start difference. First operand 222 states and 223 transitions. Second operand has 169 states, 169 states have (on average 2.3136094674556213) internal successors, (391), 168 states have internal predecessors, (391), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:01:06,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:01:06,139 INFO L93 Difference]: Finished difference Result 391 states and 393 transitions. [2022-12-14 09:01:06,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2022-12-14 09:01:06,139 INFO L78 Accepts]: Start accepts. Automaton has has 169 states, 169 states have (on average 2.3136094674556213) internal successors, (391), 168 states have internal predecessors, (391), 0 states have call successors, (0), 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 221 [2022-12-14 09:01:06,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:01:06,140 INFO L225 Difference]: With dead ends: 391 [2022-12-14 09:01:06,140 INFO L226 Difference]: Without dead ends: 223 [2022-12-14 09:01:06,142 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 827 GetRequests, 491 SyntacticMatches, 109 SemanticMatches, 227 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19673 ImplicationChecksByTransitivity, 10.2s TimeCoverageRelationStatistics Valid=11080, Invalid=41132, Unknown=0, NotChecked=0, Total=52212 [2022-12-14 09:01:06,142 INFO L413 NwaCegarLoop]: 56 mSDtfsCounter, 7 mSDsluCounter, 612 mSDsCounter, 0 mSdLazyCounter, 1363 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 668 SdHoareTripleChecker+Invalid, 1363 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1363 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 09:01:06,142 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 668 Invalid, 1363 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1363 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 09:01:06,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2022-12-14 09:01:06,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 223. [2022-12-14 09:01:06,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 223 states, 222 states have (on average 1.009009009009009) internal successors, (224), 222 states have internal predecessors, (224), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:01:06,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 223 states and 224 transitions. [2022-12-14 09:01:06,204 INFO L78 Accepts]: Start accepts. Automaton has 223 states and 224 transitions. Word has length 221 [2022-12-14 09:01:06,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:01:06,204 INFO L495 AbstractCegarLoop]: Abstraction has 223 states and 224 transitions. [2022-12-14 09:01:06,205 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 169 states, 169 states have (on average 2.3136094674556213) internal successors, (391), 168 states have internal predecessors, (391), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:01:06,205 INFO L276 IsEmpty]: Start isEmpty. Operand 223 states and 224 transitions. [2022-12-14 09:01:06,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2022-12-14 09:01:06,205 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:01:06,205 INFO L195 NwaCegarLoop]: trace histogram [55, 55, 54, 54, 1, 1, 1, 1] [2022-12-14 09:01:06,210 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (109)] Ended with exit code 0 [2022-12-14 09:01:06,406 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable108,109 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:01:06,406 INFO L420 AbstractCegarLoop]: === Iteration 110 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:01:06,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:01:06,407 INFO L85 PathProgramCache]: Analyzing trace with hash -2013914097, now seen corresponding path program 108 times [2022-12-14 09:01:06,408 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:01:06,408 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1196904385] [2022-12-14 09:01:06,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:01:06,409 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:01:06,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:01:08,541 INFO L134 CoverageAnalysis]: Checked inductivity of 5941 backedges. 1485 proven. 4456 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:01:08,541 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:01:08,541 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1196904385] [2022-12-14 09:01:08,541 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1196904385] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:01:08,541 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1108449966] [2022-12-14 09:01:08,541 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 09:01:08,541 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:01:08,541 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:01:08,542 INFO L229 MonitoredProcess]: Starting monitored process 110 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:01:08,543 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (110)] Waiting until timeout for monitored process [2022-12-14 09:01:08,647 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 09:01:08,647 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:01:08,654 INFO L263 TraceCheckSpWp]: Trace formula consists of 853 conjuncts, 116 conjunts are in the unsatisfiable core [2022-12-14 09:01:08,656 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:01:08,846 INFO L134 CoverageAnalysis]: Checked inductivity of 5941 backedges. 1540 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:01:08,846 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:01:10,633 INFO L134 CoverageAnalysis]: Checked inductivity of 5941 backedges. 1540 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:01:10,633 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1108449966] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:01:10,633 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [794924183] [2022-12-14 09:01:10,634 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 09:01:10,634 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:01:10,634 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:01:10,634 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:01:10,634 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:01:10,679 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:01:10,978 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '139793#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:01:10,978 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:01:10,978 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:01:10,978 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58, 58] total 60 [2022-12-14 09:01:10,978 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1129530940] [2022-12-14 09:01:10,978 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:01:10,979 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2022-12-14 09:01:10,979 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:01:10,979 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2022-12-14 09:01:10,980 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1682, Invalid=2608, Unknown=0, NotChecked=0, Total=4290 [2022-12-14 09:01:10,980 INFO L87 Difference]: Start difference. First operand 223 states and 224 transitions. Second operand has 61 states, 61 states have (on average 3.7049180327868854) internal successors, (226), 60 states have internal predecessors, (226), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:01:12,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:01:12,083 INFO L93 Difference]: Finished difference Result 234 states and 235 transitions. [2022-12-14 09:01:12,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 117 states. [2022-12-14 09:01:12,084 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 3.7049180327868854) internal successors, (226), 60 states have internal predecessors, (226), 0 states have call successors, (0), 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 222 [2022-12-14 09:01:12,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:01:12,084 INFO L225 Difference]: With dead ends: 234 [2022-12-14 09:01:12,084 INFO L226 Difference]: Without dead ends: 232 [2022-12-14 09:01:12,085 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 833 GetRequests, 602 SyntacticMatches, 110 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7046 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=5105, Invalid=9901, Unknown=0, NotChecked=0, Total=15006 [2022-12-14 09:01:12,086 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 118 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 637 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 118 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 640 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 637 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 09:01:12,086 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [118 Valid, 22 Invalid, 640 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 637 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 09:01:12,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2022-12-14 09:01:12,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 226. [2022-12-14 09:01:12,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 225 states have (on average 1.008888888888889) internal successors, (227), 225 states have internal predecessors, (227), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:01:12,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 227 transitions. [2022-12-14 09:01:12,156 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 227 transitions. Word has length 222 [2022-12-14 09:01:12,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:01:12,156 INFO L495 AbstractCegarLoop]: Abstraction has 226 states and 227 transitions. [2022-12-14 09:01:12,156 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 3.7049180327868854) internal successors, (226), 60 states have internal predecessors, (226), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:01:12,156 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 227 transitions. [2022-12-14 09:01:12,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 226 [2022-12-14 09:01:12,157 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:01:12,157 INFO L195 NwaCegarLoop]: trace histogram [56, 55, 55, 55, 1, 1, 1, 1] [2022-12-14 09:01:12,162 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (110)] Ended with exit code 0 [2022-12-14 09:01:12,357 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 110 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable109 [2022-12-14 09:01:12,358 INFO L420 AbstractCegarLoop]: === Iteration 111 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:01:12,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:01:12,359 INFO L85 PathProgramCache]: Analyzing trace with hash -111885622, now seen corresponding path program 109 times [2022-12-14 09:01:12,359 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:01:12,360 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1007133712] [2022-12-14 09:01:12,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:01:12,360 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:01:12,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:01:16,468 INFO L134 CoverageAnalysis]: Checked inductivity of 6105 backedges. 4402 proven. 1703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:01:16,468 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:01:16,468 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1007133712] [2022-12-14 09:01:16,468 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1007133712] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:01:16,469 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1780488711] [2022-12-14 09:01:16,469 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 09:01:16,469 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:01:16,469 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:01:16,469 INFO L229 MonitoredProcess]: Starting monitored process 111 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:01:16,470 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (111)] Waiting until timeout for monitored process [2022-12-14 09:01:16,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:01:16,596 INFO L263 TraceCheckSpWp]: Trace formula consists of 863 conjuncts, 114 conjunts are in the unsatisfiable core [2022-12-14 09:01:16,599 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:01:20,588 INFO L134 CoverageAnalysis]: Checked inductivity of 6105 backedges. 4565 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:01:20,588 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:01:23,505 INFO L134 CoverageAnalysis]: Checked inductivity of 6105 backedges. 4565 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:01:23,505 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1780488711] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:01:23,505 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1684318785] [2022-12-14 09:01:23,506 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 09:01:23,506 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:01:23,506 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:01:23,506 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:01:23,506 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:01:23,546 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:01:23,958 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '142225#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:01:23,958 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:01:23,958 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:01:23,958 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [113, 113, 113] total 171 [2022-12-14 09:01:23,958 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1425035026] [2022-12-14 09:01:23,958 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:01:23,959 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 172 states [2022-12-14 09:01:23,959 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:01:23,961 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 172 interpolants. [2022-12-14 09:01:23,962 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6631, Invalid=24521, Unknown=0, NotChecked=0, Total=31152 [2022-12-14 09:01:23,962 INFO L87 Difference]: Start difference. First operand 226 states and 227 transitions. Second operand has 172 states, 172 states have (on average 2.313953488372093) internal successors, (398), 171 states have internal predecessors, (398), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:01:26,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:01:26,415 INFO L93 Difference]: Finished difference Result 398 states and 400 transitions. [2022-12-14 09:01:26,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2022-12-14 09:01:26,416 INFO L78 Accepts]: Start accepts. Automaton has has 172 states, 172 states have (on average 2.313953488372093) internal successors, (398), 171 states have internal predecessors, (398), 0 states have call successors, (0), 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 225 [2022-12-14 09:01:26,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:01:26,416 INFO L225 Difference]: With dead ends: 398 [2022-12-14 09:01:26,416 INFO L226 Difference]: Without dead ends: 227 [2022-12-14 09:01:26,419 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 842 GetRequests, 500 SyntacticMatches, 111 SemanticMatches, 231 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20367 ImplicationChecksByTransitivity, 10.9s TimeCoverageRelationStatistics Valid=11477, Invalid=42579, Unknown=0, NotChecked=0, Total=54056 [2022-12-14 09:01:26,419 INFO L413 NwaCegarLoop]: 57 mSDtfsCounter, 7 mSDsluCounter, 526 mSDsCounter, 0 mSdLazyCounter, 1204 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 583 SdHoareTripleChecker+Invalid, 1204 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1204 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 09:01:26,419 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 583 Invalid, 1204 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1204 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 09:01:26,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2022-12-14 09:01:26,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 227. [2022-12-14 09:01:26,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 227 states, 226 states have (on average 1.008849557522124) internal successors, (228), 226 states have internal predecessors, (228), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:01:26,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 228 transitions. [2022-12-14 09:01:26,499 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 228 transitions. Word has length 225 [2022-12-14 09:01:26,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:01:26,499 INFO L495 AbstractCegarLoop]: Abstraction has 227 states and 228 transitions. [2022-12-14 09:01:26,499 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 172 states, 172 states have (on average 2.313953488372093) internal successors, (398), 171 states have internal predecessors, (398), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:01:26,499 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 228 transitions. [2022-12-14 09:01:26,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 227 [2022-12-14 09:01:26,499 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:01:26,500 INFO L195 NwaCegarLoop]: trace histogram [56, 56, 55, 55, 1, 1, 1, 1] [2022-12-14 09:01:26,504 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (111)] Ended with exit code 0 [2022-12-14 09:01:26,700 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable110,111 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:01:26,700 INFO L420 AbstractCegarLoop]: === Iteration 112 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:01:26,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:01:26,701 INFO L85 PathProgramCache]: Analyzing trace with hash -1468524731, now seen corresponding path program 110 times [2022-12-14 09:01:26,701 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:01:26,702 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1599518153] [2022-12-14 09:01:26,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:01:26,702 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:01:26,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:01:29,161 INFO L134 CoverageAnalysis]: Checked inductivity of 6161 backedges. 1540 proven. 4621 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:01:29,161 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:01:29,161 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1599518153] [2022-12-14 09:01:29,161 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1599518153] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:01:29,161 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1456537014] [2022-12-14 09:01:29,161 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 09:01:29,162 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:01:29,162 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:01:29,162 INFO L229 MonitoredProcess]: Starting monitored process 112 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:01:29,163 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (112)] Waiting until timeout for monitored process [2022-12-14 09:01:29,426 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 56 check-sat command(s) [2022-12-14 09:01:29,426 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:01:29,432 INFO L263 TraceCheckSpWp]: Trace formula consists of 868 conjuncts, 118 conjunts are in the unsatisfiable core [2022-12-14 09:01:29,434 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:01:29,595 INFO L134 CoverageAnalysis]: Checked inductivity of 6161 backedges. 1596 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:01:29,595 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:01:31,000 INFO L134 CoverageAnalysis]: Checked inductivity of 6161 backedges. 1596 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:01:31,001 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1456537014] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:01:31,001 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1936227390] [2022-12-14 09:01:31,001 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 09:01:31,001 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:01:31,001 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:01:31,002 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:01:31,002 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:01:31,063 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:01:31,372 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '144828#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:01:31,373 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:01:31,373 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:01:31,373 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 61 [2022-12-14 09:01:31,373 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1781959904] [2022-12-14 09:01:31,373 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:01:31,373 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2022-12-14 09:01:31,373 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:01:31,374 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2022-12-14 09:01:31,374 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1740, Invalid=2682, Unknown=0, NotChecked=0, Total=4422 [2022-12-14 09:01:31,374 INFO L87 Difference]: Start difference. First operand 227 states and 228 transitions. Second operand has 62 states, 62 states have (on average 3.7096774193548385) internal successors, (230), 61 states have internal predecessors, (230), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:01:32,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:01:32,203 INFO L93 Difference]: Finished difference Result 238 states and 239 transitions. [2022-12-14 09:01:32,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 119 states. [2022-12-14 09:01:32,204 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 3.7096774193548385) internal successors, (230), 61 states have internal predecessors, (230), 0 states have call successors, (0), 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 226 [2022-12-14 09:01:32,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:01:32,204 INFO L225 Difference]: With dead ends: 238 [2022-12-14 09:01:32,204 INFO L226 Difference]: Without dead ends: 236 [2022-12-14 09:01:32,205 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 848 GetRequests, 613 SyntacticMatches, 112 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7286 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=5281, Invalid=10219, Unknown=0, NotChecked=0, Total=15500 [2022-12-14 09:01:32,206 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 120 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 612 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 120 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 615 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 612 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 09:01:32,206 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [120 Valid, 18 Invalid, 615 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 612 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 09:01:32,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2022-12-14 09:01:32,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 230. [2022-12-14 09:01:32,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 230 states, 229 states have (on average 1.0087336244541485) internal successors, (231), 229 states have internal predecessors, (231), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:01:32,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 230 states to 230 states and 231 transitions. [2022-12-14 09:01:32,278 INFO L78 Accepts]: Start accepts. Automaton has 230 states and 231 transitions. Word has length 226 [2022-12-14 09:01:32,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:01:32,278 INFO L495 AbstractCegarLoop]: Abstraction has 230 states and 231 transitions. [2022-12-14 09:01:32,278 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 3.7096774193548385) internal successors, (230), 61 states have internal predecessors, (230), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:01:32,278 INFO L276 IsEmpty]: Start isEmpty. Operand 230 states and 231 transitions. [2022-12-14 09:01:32,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 230 [2022-12-14 09:01:32,279 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:01:32,279 INFO L195 NwaCegarLoop]: trace histogram [57, 56, 56, 56, 1, 1, 1, 1] [2022-12-14 09:01:32,284 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (112)] Forceful destruction successful, exit code 0 [2022-12-14 09:01:32,480 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 112 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable111 [2022-12-14 09:01:32,480 INFO L420 AbstractCegarLoop]: === Iteration 113 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:01:32,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:01:32,481 INFO L85 PathProgramCache]: Analyzing trace with hash -278563884, now seen corresponding path program 111 times [2022-12-14 09:01:32,481 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:01:32,482 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2055139787] [2022-12-14 09:01:32,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:01:32,482 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:01:32,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:01:36,411 INFO L134 CoverageAnalysis]: Checked inductivity of 6328 backedges. 4566 proven. 1762 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:01:36,411 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:01:36,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2055139787] [2022-12-14 09:01:36,411 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2055139787] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:01:36,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [757727192] [2022-12-14 09:01:36,411 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 09:01:36,411 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:01:36,411 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:01:36,412 INFO L229 MonitoredProcess]: Starting monitored process 113 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:01:36,412 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (113)] Waiting until timeout for monitored process [2022-12-14 09:01:36,522 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 09:01:36,522 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:01:36,530 INFO L263 TraceCheckSpWp]: Trace formula consists of 878 conjuncts, 116 conjunts are in the unsatisfiable core [2022-12-14 09:01:36,533 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:01:40,781 INFO L134 CoverageAnalysis]: Checked inductivity of 6328 backedges. 4732 proven. 1596 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:01:40,781 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:01:43,940 INFO L134 CoverageAnalysis]: Checked inductivity of 6328 backedges. 4732 proven. 1596 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:01:43,940 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [757727192] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:01:43,940 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1848686941] [2022-12-14 09:01:43,941 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 09:01:43,941 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:01:43,941 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:01:43,941 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:01:43,941 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:01:43,982 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:01:44,518 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '147303#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:01:44,518 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:01:44,518 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:01:44,518 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [115, 115, 115] total 174 [2022-12-14 09:01:44,518 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2130874260] [2022-12-14 09:01:44,518 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:01:44,518 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 175 states [2022-12-14 09:01:44,518 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:01:44,519 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 175 interpolants. [2022-12-14 09:01:44,521 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6863, Invalid=25357, Unknown=0, NotChecked=0, Total=32220 [2022-12-14 09:01:44,521 INFO L87 Difference]: Start difference. First operand 230 states and 231 transitions. Second operand has 175 states, 175 states have (on average 2.3142857142857145) internal successors, (405), 174 states have internal predecessors, (405), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:01:46,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:01:46,516 INFO L93 Difference]: Finished difference Result 405 states and 407 transitions. [2022-12-14 09:01:46,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 116 states. [2022-12-14 09:01:46,516 INFO L78 Accepts]: Start accepts. Automaton has has 175 states, 175 states have (on average 2.3142857142857145) internal successors, (405), 174 states have internal predecessors, (405), 0 states have call successors, (0), 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 229 [2022-12-14 09:01:46,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:01:46,516 INFO L225 Difference]: With dead ends: 405 [2022-12-14 09:01:46,516 INFO L226 Difference]: Without dead ends: 231 [2022-12-14 09:01:46,519 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 857 GetRequests, 509 SyntacticMatches, 113 SemanticMatches, 235 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21073 ImplicationChecksByTransitivity, 11.0s TimeCoverageRelationStatistics Valid=11881, Invalid=44051, Unknown=0, NotChecked=0, Total=55932 [2022-12-14 09:01:46,519 INFO L413 NwaCegarLoop]: 58 mSDtfsCounter, 7 mSDsluCounter, 503 mSDsCounter, 0 mSdLazyCounter, 1156 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 561 SdHoareTripleChecker+Invalid, 1156 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1156 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 09:01:46,519 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 561 Invalid, 1156 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1156 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 09:01:46,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2022-12-14 09:01:46,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 231. [2022-12-14 09:01:46,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 231 states, 230 states have (on average 1.008695652173913) internal successors, (232), 230 states have internal predecessors, (232), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:01:46,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 231 states to 231 states and 232 transitions. [2022-12-14 09:01:46,586 INFO L78 Accepts]: Start accepts. Automaton has 231 states and 232 transitions. Word has length 229 [2022-12-14 09:01:46,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:01:46,586 INFO L495 AbstractCegarLoop]: Abstraction has 231 states and 232 transitions. [2022-12-14 09:01:46,586 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 175 states, 175 states have (on average 2.3142857142857145) internal successors, (405), 174 states have internal predecessors, (405), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:01:46,586 INFO L276 IsEmpty]: Start isEmpty. Operand 231 states and 232 transitions. [2022-12-14 09:01:46,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 231 [2022-12-14 09:01:46,587 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:01:46,587 INFO L195 NwaCegarLoop]: trace histogram [57, 57, 56, 56, 1, 1, 1, 1] [2022-12-14 09:01:46,592 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (113)] Forceful destruction successful, exit code 0 [2022-12-14 09:01:46,787 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 113 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable112 [2022-12-14 09:01:46,788 INFO L420 AbstractCegarLoop]: === Iteration 114 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:01:46,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:01:46,789 INFO L85 PathProgramCache]: Analyzing trace with hash -75230513, now seen corresponding path program 112 times [2022-12-14 09:01:46,789 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:01:46,789 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2029425284] [2022-12-14 09:01:46,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:01:46,790 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:01:46,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:01:49,117 INFO L134 CoverageAnalysis]: Checked inductivity of 6385 backedges. 1596 proven. 4789 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:01:49,117 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:01:49,117 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2029425284] [2022-12-14 09:01:49,117 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2029425284] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:01:49,117 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [585529548] [2022-12-14 09:01:49,117 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 09:01:49,117 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:01:49,117 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:01:49,118 INFO L229 MonitoredProcess]: Starting monitored process 114 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:01:49,118 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (114)] Waiting until timeout for monitored process [2022-12-14 09:01:49,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:01:49,229 INFO L263 TraceCheckSpWp]: Trace formula consists of 883 conjuncts, 120 conjunts are in the unsatisfiable core [2022-12-14 09:01:49,231 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:01:49,410 INFO L134 CoverageAnalysis]: Checked inductivity of 6385 backedges. 1653 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:01:49,410 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:01:51,083 INFO L134 CoverageAnalysis]: Checked inductivity of 6385 backedges. 1653 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:01:51,083 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [585529548] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:01:51,083 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1734424116] [2022-12-14 09:01:51,084 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 09:01:51,084 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:01:51,084 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:01:51,084 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:01:51,084 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:01:51,131 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:01:51,377 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '149952#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:01:51,378 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:01:51,378 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:01:51,378 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 62 [2022-12-14 09:01:51,378 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [893956215] [2022-12-14 09:01:51,378 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:01:51,378 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2022-12-14 09:01:51,378 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:01:51,379 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2022-12-14 09:01:51,379 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1799, Invalid=2757, Unknown=0, NotChecked=0, Total=4556 [2022-12-14 09:01:51,379 INFO L87 Difference]: Start difference. First operand 231 states and 232 transitions. Second operand has 63 states, 63 states have (on average 3.7142857142857144) internal successors, (234), 62 states have internal predecessors, (234), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:01:52,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:01:52,357 INFO L93 Difference]: Finished difference Result 242 states and 243 transitions. [2022-12-14 09:01:52,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2022-12-14 09:01:52,358 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 3.7142857142857144) internal successors, (234), 62 states have internal predecessors, (234), 0 states have call successors, (0), 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 230 [2022-12-14 09:01:52,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:01:52,358 INFO L225 Difference]: With dead ends: 242 [2022-12-14 09:01:52,358 INFO L226 Difference]: Without dead ends: 240 [2022-12-14 09:01:52,359 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 863 GetRequests, 624 SyntacticMatches, 114 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7530 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=5460, Invalid=10542, Unknown=0, NotChecked=0, Total=16002 [2022-12-14 09:01:52,359 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 122 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 598 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 122 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 601 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 598 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 09:01:52,359 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [122 Valid, 16 Invalid, 601 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 598 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 09:01:52,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240 states. [2022-12-14 09:01:52,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240 to 234. [2022-12-14 09:01:52,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 234 states, 233 states have (on average 1.0085836909871244) internal successors, (235), 233 states have internal predecessors, (235), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:01:52,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 234 states to 234 states and 235 transitions. [2022-12-14 09:01:52,428 INFO L78 Accepts]: Start accepts. Automaton has 234 states and 235 transitions. Word has length 230 [2022-12-14 09:01:52,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:01:52,428 INFO L495 AbstractCegarLoop]: Abstraction has 234 states and 235 transitions. [2022-12-14 09:01:52,428 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 3.7142857142857144) internal successors, (234), 62 states have internal predecessors, (234), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:01:52,428 INFO L276 IsEmpty]: Start isEmpty. Operand 234 states and 235 transitions. [2022-12-14 09:01:52,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 234 [2022-12-14 09:01:52,429 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:01:52,429 INFO L195 NwaCegarLoop]: trace histogram [58, 57, 57, 57, 1, 1, 1, 1] [2022-12-14 09:01:52,434 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (114)] Forceful destruction successful, exit code 0 [2022-12-14 09:01:52,629 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable113,114 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:01:52,630 INFO L420 AbstractCegarLoop]: === Iteration 115 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:01:52,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:01:52,631 INFO L85 PathProgramCache]: Analyzing trace with hash 785536010, now seen corresponding path program 113 times [2022-12-14 09:01:52,631 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:01:52,631 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [749101174] [2022-12-14 09:01:52,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:01:52,632 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:01:52,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:01:56,520 INFO L134 CoverageAnalysis]: Checked inductivity of 6555 backedges. 4733 proven. 1822 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:01:56,521 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:01:56,521 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [749101174] [2022-12-14 09:01:56,521 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [749101174] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:01:56,521 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1284224586] [2022-12-14 09:01:56,521 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 09:01:56,521 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:01:56,521 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:01:56,522 INFO L229 MonitoredProcess]: Starting monitored process 115 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:01:56,522 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (115)] Waiting until timeout for monitored process [2022-12-14 09:01:56,773 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 58 check-sat command(s) [2022-12-14 09:01:56,773 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:01:56,779 INFO L263 TraceCheckSpWp]: Trace formula consists of 893 conjuncts, 118 conjunts are in the unsatisfiable core [2022-12-14 09:01:56,781 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:02:00,397 INFO L134 CoverageAnalysis]: Checked inductivity of 6555 backedges. 4902 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:02:00,397 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:02:03,338 INFO L134 CoverageAnalysis]: Checked inductivity of 6555 backedges. 4902 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:02:03,338 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1284224586] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:02:03,338 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1466379007] [2022-12-14 09:02:03,339 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 09:02:03,339 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:02:03,339 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:02:03,339 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:02:03,339 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:02:03,383 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:02:03,898 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '152470#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:02:03,898 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:02:03,898 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:02:03,899 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [117, 117, 117] total 177 [2022-12-14 09:02:03,899 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [740984405] [2022-12-14 09:02:03,899 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:02:03,899 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 178 states [2022-12-14 09:02:03,899 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:02:03,900 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 178 interpolants. [2022-12-14 09:02:03,901 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7099, Invalid=26207, Unknown=0, NotChecked=0, Total=33306 [2022-12-14 09:02:03,901 INFO L87 Difference]: Start difference. First operand 234 states and 235 transitions. Second operand has 178 states, 178 states have (on average 2.3146067415730336) internal successors, (412), 177 states have internal predecessors, (412), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:02:06,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:02:06,431 INFO L93 Difference]: Finished difference Result 412 states and 414 transitions. [2022-12-14 09:02:06,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 118 states. [2022-12-14 09:02:06,431 INFO L78 Accepts]: Start accepts. Automaton has has 178 states, 178 states have (on average 2.3146067415730336) internal successors, (412), 177 states have internal predecessors, (412), 0 states have call successors, (0), 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 233 [2022-12-14 09:02:06,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:02:06,432 INFO L225 Difference]: With dead ends: 412 [2022-12-14 09:02:06,432 INFO L226 Difference]: Without dead ends: 235 [2022-12-14 09:02:06,434 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 872 GetRequests, 518 SyntacticMatches, 115 SemanticMatches, 239 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21791 ImplicationChecksByTransitivity, 10.4s TimeCoverageRelationStatistics Valid=12292, Invalid=45548, Unknown=0, NotChecked=0, Total=57840 [2022-12-14 09:02:06,434 INFO L413 NwaCegarLoop]: 59 mSDtfsCounter, 7 mSDsluCounter, 591 mSDsCounter, 0 mSdLazyCounter, 1326 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 650 SdHoareTripleChecker+Invalid, 1326 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1326 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 09:02:06,434 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 650 Invalid, 1326 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1326 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 09:02:06,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 235 states. [2022-12-14 09:02:06,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 235 to 235. [2022-12-14 09:02:06,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 235 states, 234 states have (on average 1.0085470085470085) internal successors, (236), 234 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) [2022-12-14 09:02:06,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 236 transitions. [2022-12-14 09:02:06,503 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 236 transitions. Word has length 233 [2022-12-14 09:02:06,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:02:06,504 INFO L495 AbstractCegarLoop]: Abstraction has 235 states and 236 transitions. [2022-12-14 09:02:06,504 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 178 states, 178 states have (on average 2.3146067415730336) internal successors, (412), 177 states have internal predecessors, (412), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:02:06,504 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 236 transitions. [2022-12-14 09:02:06,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 235 [2022-12-14 09:02:06,504 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:02:06,505 INFO L195 NwaCegarLoop]: trace histogram [58, 58, 57, 57, 1, 1, 1, 1] [2022-12-14 09:02:06,510 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (115)] Ended with exit code 0 [2022-12-14 09:02:06,705 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 115 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable114 [2022-12-14 09:02:06,705 INFO L420 AbstractCegarLoop]: === Iteration 116 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:02:06,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:02:06,706 INFO L85 PathProgramCache]: Analyzing trace with hash -1136460411, now seen corresponding path program 114 times [2022-12-14 09:02:06,706 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:02:06,707 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [275951667] [2022-12-14 09:02:06,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:02:06,707 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:02:06,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:02:09,364 INFO L134 CoverageAnalysis]: Checked inductivity of 6613 backedges. 1653 proven. 4960 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:02:09,364 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:02:09,365 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [275951667] [2022-12-14 09:02:09,365 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [275951667] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:02:09,365 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1668320799] [2022-12-14 09:02:09,365 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 09:02:09,365 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:02:09,365 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:02:09,366 INFO L229 MonitoredProcess]: Starting monitored process 116 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:02:09,366 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (116)] Waiting until timeout for monitored process [2022-12-14 09:02:09,496 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 09:02:09,496 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:02:09,504 INFO L263 TraceCheckSpWp]: Trace formula consists of 898 conjuncts, 122 conjunts are in the unsatisfiable core [2022-12-14 09:02:09,506 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:02:09,695 INFO L134 CoverageAnalysis]: Checked inductivity of 6613 backedges. 1711 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:02:09,695 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:02:11,420 INFO L134 CoverageAnalysis]: Checked inductivity of 6613 backedges. 1711 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:02:11,420 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1668320799] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:02:11,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [459458041] [2022-12-14 09:02:11,421 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 09:02:11,421 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:02:11,421 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:02:11,421 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:02:11,421 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:02:11,469 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:02:11,790 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '155165#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:02:11,790 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:02:11,790 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:02:11,791 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 63 [2022-12-14 09:02:11,791 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1694367798] [2022-12-14 09:02:11,791 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:02:11,791 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2022-12-14 09:02:11,791 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:02:11,792 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2022-12-14 09:02:11,792 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1859, Invalid=2833, Unknown=0, NotChecked=0, Total=4692 [2022-12-14 09:02:11,792 INFO L87 Difference]: Start difference. First operand 235 states and 236 transitions. Second operand has 64 states, 64 states have (on average 3.71875) internal successors, (238), 63 states have internal predecessors, (238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:02:13,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:02:13,289 INFO L93 Difference]: Finished difference Result 246 states and 247 transitions. [2022-12-14 09:02:13,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2022-12-14 09:02:13,289 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 3.71875) internal successors, (238), 63 states have internal predecessors, (238), 0 states have call successors, (0), 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 234 [2022-12-14 09:02:13,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:02:13,290 INFO L225 Difference]: With dead ends: 246 [2022-12-14 09:02:13,290 INFO L226 Difference]: Without dead ends: 244 [2022-12-14 09:02:13,291 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 878 GetRequests, 635 SyntacticMatches, 116 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7778 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=5642, Invalid=10870, Unknown=0, NotChecked=0, Total=16512 [2022-12-14 09:02:13,291 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 242 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 610 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 242 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 613 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 610 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 09:02:13,291 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [242 Valid, 17 Invalid, 613 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 610 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 09:02:13,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2022-12-14 09:02:13,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 238. [2022-12-14 09:02:13,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 238 states, 237 states have (on average 1.0084388185654007) internal successors, (239), 237 states have internal predecessors, (239), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:02:13,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 239 transitions. [2022-12-14 09:02:13,362 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 239 transitions. Word has length 234 [2022-12-14 09:02:13,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:02:13,362 INFO L495 AbstractCegarLoop]: Abstraction has 238 states and 239 transitions. [2022-12-14 09:02:13,362 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 3.71875) internal successors, (238), 63 states have internal predecessors, (238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:02:13,362 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 239 transitions. [2022-12-14 09:02:13,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 238 [2022-12-14 09:02:13,363 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:02:13,363 INFO L195 NwaCegarLoop]: trace histogram [59, 58, 58, 58, 1, 1, 1, 1] [2022-12-14 09:02:13,368 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (116)] Ended with exit code 0 [2022-12-14 09:02:13,564 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 116 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable115 [2022-12-14 09:02:13,564 INFO L420 AbstractCegarLoop]: === Iteration 117 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:02:13,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:02:13,565 INFO L85 PathProgramCache]: Analyzing trace with hash 939910548, now seen corresponding path program 115 times [2022-12-14 09:02:13,565 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:02:13,565 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [502856243] [2022-12-14 09:02:13,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:02:13,566 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:02:13,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:02:18,021 INFO L134 CoverageAnalysis]: Checked inductivity of 6786 backedges. 4903 proven. 1883 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:02:18,021 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:02:18,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [502856243] [2022-12-14 09:02:18,021 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [502856243] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:02:18,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1064809869] [2022-12-14 09:02:18,021 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 09:02:18,021 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:02:18,021 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:02:18,022 INFO L229 MonitoredProcess]: Starting monitored process 117 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:02:18,023 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (117)] Waiting until timeout for monitored process [2022-12-14 09:02:18,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:02:18,130 INFO L263 TraceCheckSpWp]: Trace formula consists of 908 conjuncts, 120 conjunts are in the unsatisfiable core [2022-12-14 09:02:18,133 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:02:22,089 INFO L134 CoverageAnalysis]: Checked inductivity of 6786 backedges. 5075 proven. 1711 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:02:22,089 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:02:24,637 INFO L134 CoverageAnalysis]: Checked inductivity of 6786 backedges. 5075 proven. 1711 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:02:24,637 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1064809869] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:02:24,637 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1444191857] [2022-12-14 09:02:24,638 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 09:02:24,638 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:02:24,638 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:02:24,638 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:02:24,639 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:02:24,681 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:02:25,191 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '157726#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:02:25,191 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:02:25,191 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:02:25,191 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [119, 119, 119] total 180 [2022-12-14 09:02:25,192 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [240362941] [2022-12-14 09:02:25,192 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:02:25,192 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 181 states [2022-12-14 09:02:25,192 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:02:25,194 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 181 interpolants. [2022-12-14 09:02:25,195 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7339, Invalid=27071, Unknown=0, NotChecked=0, Total=34410 [2022-12-14 09:02:25,195 INFO L87 Difference]: Start difference. First operand 238 states and 239 transitions. Second operand has 181 states, 181 states have (on average 2.314917127071823) internal successors, (419), 180 states have internal predecessors, (419), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:02:27,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:02:27,566 INFO L93 Difference]: Finished difference Result 419 states and 421 transitions. [2022-12-14 09:02:27,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 120 states. [2022-12-14 09:02:27,566 INFO L78 Accepts]: Start accepts. Automaton has has 181 states, 181 states have (on average 2.314917127071823) internal successors, (419), 180 states have internal predecessors, (419), 0 states have call successors, (0), 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 237 [2022-12-14 09:02:27,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:02:27,567 INFO L225 Difference]: With dead ends: 419 [2022-12-14 09:02:27,567 INFO L226 Difference]: Without dead ends: 239 [2022-12-14 09:02:27,569 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 887 GetRequests, 527 SyntacticMatches, 117 SemanticMatches, 243 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22521 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=12710, Invalid=47070, Unknown=0, NotChecked=0, Total=59780 [2022-12-14 09:02:27,569 INFO L413 NwaCegarLoop]: 60 mSDtfsCounter, 7 mSDsluCounter, 662 mSDsCounter, 0 mSdLazyCounter, 1464 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 722 SdHoareTripleChecker+Invalid, 1464 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1464 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 09:02:27,569 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 722 Invalid, 1464 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1464 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 09:02:27,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 239 states. [2022-12-14 09:02:27,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 239 to 239. [2022-12-14 09:02:27,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 239 states, 238 states have (on average 1.0084033613445378) internal successors, (240), 238 states have internal predecessors, (240), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:02:27,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 240 transitions. [2022-12-14 09:02:27,640 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 240 transitions. Word has length 237 [2022-12-14 09:02:27,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:02:27,641 INFO L495 AbstractCegarLoop]: Abstraction has 239 states and 240 transitions. [2022-12-14 09:02:27,641 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 181 states, 181 states have (on average 2.314917127071823) internal successors, (419), 180 states have internal predecessors, (419), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:02:27,641 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 240 transitions. [2022-12-14 09:02:27,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 239 [2022-12-14 09:02:27,641 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:02:27,641 INFO L195 NwaCegarLoop]: trace histogram [59, 59, 58, 58, 1, 1, 1, 1] [2022-12-14 09:02:27,646 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (117)] Ended with exit code 0 [2022-12-14 09:02:27,842 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable116,117 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:02:27,843 INFO L420 AbstractCegarLoop]: === Iteration 118 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:02:27,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:02:27,844 INFO L85 PathProgramCache]: Analyzing trace with hash -507553393, now seen corresponding path program 116 times [2022-12-14 09:02:27,844 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:02:27,844 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1897093338] [2022-12-14 09:02:27,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:02:27,845 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:02:27,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:02:30,578 INFO L134 CoverageAnalysis]: Checked inductivity of 6845 backedges. 1711 proven. 5134 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:02:30,578 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:02:30,578 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1897093338] [2022-12-14 09:02:30,578 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1897093338] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:02:30,578 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [614737167] [2022-12-14 09:02:30,578 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 09:02:30,578 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:02:30,578 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:02:30,579 INFO L229 MonitoredProcess]: Starting monitored process 118 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:02:30,580 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (118)] Waiting until timeout for monitored process [2022-12-14 09:02:30,860 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 59 check-sat command(s) [2022-12-14 09:02:30,860 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:02:30,866 INFO L263 TraceCheckSpWp]: Trace formula consists of 913 conjuncts, 124 conjunts are in the unsatisfiable core [2022-12-14 09:02:30,868 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:02:31,086 INFO L134 CoverageAnalysis]: Checked inductivity of 6845 backedges. 1770 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:02:31,086 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:02:32,979 INFO L134 CoverageAnalysis]: Checked inductivity of 6845 backedges. 1770 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:02:32,979 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [614737167] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:02:32,979 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [702456757] [2022-12-14 09:02:32,980 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 09:02:32,980 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:02:32,980 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:02:32,980 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:02:32,980 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:02:33,025 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:02:33,272 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '160467#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:02:33,272 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:02:33,272 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:02:33,272 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62] total 64 [2022-12-14 09:02:33,272 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1278797912] [2022-12-14 09:02:33,272 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:02:33,272 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2022-12-14 09:02:33,272 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:02:33,273 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2022-12-14 09:02:33,273 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1920, Invalid=2910, Unknown=0, NotChecked=0, Total=4830 [2022-12-14 09:02:33,273 INFO L87 Difference]: Start difference. First operand 239 states and 240 transitions. Second operand has 65 states, 65 states have (on average 3.723076923076923) internal successors, (242), 64 states have internal predecessors, (242), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:02:34,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:02:34,499 INFO L93 Difference]: Finished difference Result 250 states and 251 transitions. [2022-12-14 09:02:34,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 125 states. [2022-12-14 09:02:34,499 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 3.723076923076923) internal successors, (242), 64 states have internal predecessors, (242), 0 states have call successors, (0), 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 238 [2022-12-14 09:02:34,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:02:34,500 INFO L225 Difference]: With dead ends: 250 [2022-12-14 09:02:34,500 INFO L226 Difference]: Without dead ends: 248 [2022-12-14 09:02:34,501 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 893 GetRequests, 646 SyntacticMatches, 118 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8030 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=5827, Invalid=11203, Unknown=0, NotChecked=0, Total=17030 [2022-12-14 09:02:34,501 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 246 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 628 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 246 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 631 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 628 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 09:02:34,501 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [246 Valid, 21 Invalid, 631 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 628 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 09:02:34,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2022-12-14 09:02:34,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 242. [2022-12-14 09:02:34,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 242 states, 241 states have (on average 1.008298755186722) internal successors, (243), 241 states have internal predecessors, (243), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:02:34,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 242 states to 242 states and 243 transitions. [2022-12-14 09:02:34,574 INFO L78 Accepts]: Start accepts. Automaton has 242 states and 243 transitions. Word has length 238 [2022-12-14 09:02:34,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:02:34,575 INFO L495 AbstractCegarLoop]: Abstraction has 242 states and 243 transitions. [2022-12-14 09:02:34,575 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 3.723076923076923) internal successors, (242), 64 states have internal predecessors, (242), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:02:34,575 INFO L276 IsEmpty]: Start isEmpty. Operand 242 states and 243 transitions. [2022-12-14 09:02:34,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 242 [2022-12-14 09:02:34,576 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:02:34,576 INFO L195 NwaCegarLoop]: trace histogram [60, 59, 59, 59, 1, 1, 1, 1] [2022-12-14 09:02:34,581 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (118)] Ended with exit code 0 [2022-12-14 09:02:34,776 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 118 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable117 [2022-12-14 09:02:34,777 INFO L420 AbstractCegarLoop]: === Iteration 119 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:02:34,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:02:34,778 INFO L85 PathProgramCache]: Analyzing trace with hash 2061538634, now seen corresponding path program 117 times [2022-12-14 09:02:34,778 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:02:34,778 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1439780444] [2022-12-14 09:02:34,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:02:34,779 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:02:34,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:02:38,881 INFO L134 CoverageAnalysis]: Checked inductivity of 7021 backedges. 5076 proven. 1945 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:02:38,881 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:02:38,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1439780444] [2022-12-14 09:02:38,882 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1439780444] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:02:38,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1737753292] [2022-12-14 09:02:38,882 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 09:02:38,882 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:02:38,882 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:02:38,883 INFO L229 MonitoredProcess]: Starting monitored process 119 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:02:38,883 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (119)] Waiting until timeout for monitored process [2022-12-14 09:02:39,018 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 09:02:39,018 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:02:39,027 INFO L263 TraceCheckSpWp]: Trace formula consists of 923 conjuncts, 122 conjunts are in the unsatisfiable core [2022-12-14 09:02:39,030 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:02:42,828 INFO L134 CoverageAnalysis]: Checked inductivity of 7021 backedges. 5251 proven. 1770 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:02:42,828 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:02:45,327 INFO L134 CoverageAnalysis]: Checked inductivity of 7021 backedges. 5251 proven. 1770 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:02:45,328 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1737753292] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:02:45,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1793521186] [2022-12-14 09:02:45,329 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 09:02:45,329 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:02:45,329 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:02:45,329 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:02:45,329 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:02:45,372 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:02:45,923 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '163071#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:02:45,923 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:02:45,923 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:02:45,923 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [121, 121, 121] total 183 [2022-12-14 09:02:45,923 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1642104990] [2022-12-14 09:02:45,923 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:02:45,924 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 184 states [2022-12-14 09:02:45,924 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:02:45,926 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 184 interpolants. [2022-12-14 09:02:45,927 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7583, Invalid=27949, Unknown=0, NotChecked=0, Total=35532 [2022-12-14 09:02:45,927 INFO L87 Difference]: Start difference. First operand 242 states and 243 transitions. Second operand has 184 states, 184 states have (on average 2.3152173913043477) internal successors, (426), 183 states have internal predecessors, (426), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:02:48,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:02:48,389 INFO L93 Difference]: Finished difference Result 426 states and 428 transitions. [2022-12-14 09:02:48,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 122 states. [2022-12-14 09:02:48,389 INFO L78 Accepts]: Start accepts. Automaton has has 184 states, 184 states have (on average 2.3152173913043477) internal successors, (426), 183 states have internal predecessors, (426), 0 states have call successors, (0), 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 241 [2022-12-14 09:02:48,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:02:48,390 INFO L225 Difference]: With dead ends: 426 [2022-12-14 09:02:48,390 INFO L226 Difference]: Without dead ends: 243 [2022-12-14 09:02:48,392 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 902 GetRequests, 536 SyntacticMatches, 119 SemanticMatches, 247 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23263 ImplicationChecksByTransitivity, 10.3s TimeCoverageRelationStatistics Valid=13135, Invalid=48617, Unknown=0, NotChecked=0, Total=61752 [2022-12-14 09:02:48,392 INFO L413 NwaCegarLoop]: 61 mSDtfsCounter, 7 mSDsluCounter, 557 mSDsCounter, 0 mSdLazyCounter, 1264 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 618 SdHoareTripleChecker+Invalid, 1264 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1264 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 09:02:48,392 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 618 Invalid, 1264 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1264 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 09:02:48,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2022-12-14 09:02:48,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 243. [2022-12-14 09:02:48,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 243 states, 242 states have (on average 1.0082644628099173) internal successors, (244), 242 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) [2022-12-14 09:02:48,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 243 states to 243 states and 244 transitions. [2022-12-14 09:02:48,466 INFO L78 Accepts]: Start accepts. Automaton has 243 states and 244 transitions. Word has length 241 [2022-12-14 09:02:48,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:02:48,466 INFO L495 AbstractCegarLoop]: Abstraction has 243 states and 244 transitions. [2022-12-14 09:02:48,466 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 184 states, 184 states have (on average 2.3152173913043477) internal successors, (426), 183 states have internal predecessors, (426), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:02:48,466 INFO L276 IsEmpty]: Start isEmpty. Operand 243 states and 244 transitions. [2022-12-14 09:02:48,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 243 [2022-12-14 09:02:48,467 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:02:48,467 INFO L195 NwaCegarLoop]: trace histogram [60, 60, 59, 59, 1, 1, 1, 1] [2022-12-14 09:02:48,472 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (119)] Ended with exit code 0 [2022-12-14 09:02:48,668 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 119 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable118 [2022-12-14 09:02:48,668 INFO L420 AbstractCegarLoop]: === Iteration 120 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:02:48,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:02:48,669 INFO L85 PathProgramCache]: Analyzing trace with hash 41522117, now seen corresponding path program 118 times [2022-12-14 09:02:48,669 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:02:48,670 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [29106359] [2022-12-14 09:02:48,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:02:48,670 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:02:48,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:02:51,474 INFO L134 CoverageAnalysis]: Checked inductivity of 7081 backedges. 1770 proven. 5311 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:02:51,474 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:02:51,474 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [29106359] [2022-12-14 09:02:51,474 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [29106359] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:02:51,474 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1401741577] [2022-12-14 09:02:51,474 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 09:02:51,474 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:02:51,474 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:02:51,475 INFO L229 MonitoredProcess]: Starting monitored process 120 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:02:51,476 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (120)] Waiting until timeout for monitored process [2022-12-14 09:02:51,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:02:51,602 INFO L263 TraceCheckSpWp]: Trace formula consists of 928 conjuncts, 126 conjunts are in the unsatisfiable core [2022-12-14 09:02:51,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:02:51,809 INFO L134 CoverageAnalysis]: Checked inductivity of 7081 backedges. 1830 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:02:51,809 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:02:53,947 INFO L134 CoverageAnalysis]: Checked inductivity of 7081 backedges. 1830 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:02:53,947 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1401741577] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:02:53,947 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [381729293] [2022-12-14 09:02:53,948 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 09:02:53,948 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:02:53,948 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:02:53,948 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:02:53,948 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:02:53,989 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:02:54,239 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '165858#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:02:54,239 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:02:54,239 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:02:54,239 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 65 [2022-12-14 09:02:54,239 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1234181395] [2022-12-14 09:02:54,239 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:02:54,240 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2022-12-14 09:02:54,240 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:02:54,240 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2022-12-14 09:02:54,240 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1982, Invalid=2988, Unknown=0, NotChecked=0, Total=4970 [2022-12-14 09:02:54,240 INFO L87 Difference]: Start difference. First operand 243 states and 244 transitions. Second operand has 66 states, 66 states have (on average 3.727272727272727) internal successors, (246), 65 states have internal predecessors, (246), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:02:55,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:02:55,727 INFO L93 Difference]: Finished difference Result 254 states and 255 transitions. [2022-12-14 09:02:55,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 127 states. [2022-12-14 09:02:55,727 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 3.727272727272727) internal successors, (246), 65 states have internal predecessors, (246), 0 states have call successors, (0), 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 242 [2022-12-14 09:02:55,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:02:55,728 INFO L225 Difference]: With dead ends: 254 [2022-12-14 09:02:55,728 INFO L226 Difference]: Without dead ends: 252 [2022-12-14 09:02:55,729 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 908 GetRequests, 657 SyntacticMatches, 120 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8286 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=6015, Invalid=11541, Unknown=0, NotChecked=0, Total=17556 [2022-12-14 09:02:55,729 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 130 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 646 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 130 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 649 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 646 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 09:02:55,729 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [130 Valid, 14 Invalid, 649 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 646 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 09:02:55,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252 states. [2022-12-14 09:02:55,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 252 to 246. [2022-12-14 09:02:55,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 246 states, 245 states have (on average 1.0081632653061225) internal successors, (247), 245 states have internal predecessors, (247), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:02:55,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 246 states to 246 states and 247 transitions. [2022-12-14 09:02:55,806 INFO L78 Accepts]: Start accepts. Automaton has 246 states and 247 transitions. Word has length 242 [2022-12-14 09:02:55,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:02:55,806 INFO L495 AbstractCegarLoop]: Abstraction has 246 states and 247 transitions. [2022-12-14 09:02:55,806 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 66 states have (on average 3.727272727272727) internal successors, (246), 65 states have internal predecessors, (246), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:02:55,806 INFO L276 IsEmpty]: Start isEmpty. Operand 246 states and 247 transitions. [2022-12-14 09:02:55,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 246 [2022-12-14 09:02:55,806 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:02:55,807 INFO L195 NwaCegarLoop]: trace histogram [61, 60, 60, 60, 1, 1, 1, 1] [2022-12-14 09:02:55,812 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (120)] Ended with exit code 0 [2022-12-14 09:02:56,007 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable119,120 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:02:56,008 INFO L420 AbstractCegarLoop]: === Iteration 121 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:02:56,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:02:56,008 INFO L85 PathProgramCache]: Analyzing trace with hash 39626580, now seen corresponding path program 119 times [2022-12-14 09:02:56,009 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:02:56,009 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1796519365] [2022-12-14 09:02:56,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:02:56,009 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:02:56,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:03:01,526 INFO L134 CoverageAnalysis]: Checked inductivity of 7260 backedges. 5252 proven. 2008 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:03:01,526 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:03:01,526 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1796519365] [2022-12-14 09:03:01,526 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1796519365] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:03:01,526 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [843556640] [2022-12-14 09:03:01,526 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 09:03:01,526 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:03:01,527 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:03:01,527 INFO L229 MonitoredProcess]: Starting monitored process 121 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:03:01,528 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (121)] Waiting until timeout for monitored process [2022-12-14 09:03:01,838 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 61 check-sat command(s) [2022-12-14 09:03:01,838 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:03:01,844 INFO L263 TraceCheckSpWp]: Trace formula consists of 938 conjuncts, 124 conjunts are in the unsatisfiable core [2022-12-14 09:03:01,847 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:03:06,668 INFO L134 CoverageAnalysis]: Checked inductivity of 7260 backedges. 5430 proven. 1830 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:03:06,669 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:03:09,657 INFO L134 CoverageAnalysis]: Checked inductivity of 7260 backedges. 5430 proven. 1830 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:03:09,657 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [843556640] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:03:09,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [663785914] [2022-12-14 09:03:09,658 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 09:03:09,658 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:03:09,658 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:03:09,658 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:03:09,658 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:03:09,709 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:03:10,361 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '168505#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:03:10,361 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:03:10,361 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:03:10,361 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [123, 123, 123] total 186 [2022-12-14 09:03:10,361 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2143070572] [2022-12-14 09:03:10,361 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:03:10,362 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 187 states [2022-12-14 09:03:10,362 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:03:10,364 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 187 interpolants. [2022-12-14 09:03:10,365 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7831, Invalid=28841, Unknown=0, NotChecked=0, Total=36672 [2022-12-14 09:03:10,365 INFO L87 Difference]: Start difference. First operand 246 states and 247 transitions. Second operand has 187 states, 187 states have (on average 2.3155080213903743) internal successors, (433), 186 states have internal predecessors, (433), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:03:13,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:03:13,109 INFO L93 Difference]: Finished difference Result 433 states and 435 transitions. [2022-12-14 09:03:13,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2022-12-14 09:03:13,109 INFO L78 Accepts]: Start accepts. Automaton has has 187 states, 187 states have (on average 2.3155080213903743) internal successors, (433), 186 states have internal predecessors, (433), 0 states have call successors, (0), 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 245 [2022-12-14 09:03:13,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:03:13,110 INFO L225 Difference]: With dead ends: 433 [2022-12-14 09:03:13,110 INFO L226 Difference]: Without dead ends: 247 [2022-12-14 09:03:13,113 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 917 GetRequests, 545 SyntacticMatches, 121 SemanticMatches, 251 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24017 ImplicationChecksByTransitivity, 13.2s TimeCoverageRelationStatistics Valid=13567, Invalid=50189, Unknown=0, NotChecked=0, Total=63756 [2022-12-14 09:03:13,113 INFO L413 NwaCegarLoop]: 62 mSDtfsCounter, 7 mSDsluCounter, 697 mSDsCounter, 0 mSdLazyCounter, 1550 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 759 SdHoareTripleChecker+Invalid, 1550 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1550 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-12-14 09:03:13,113 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 759 Invalid, 1550 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1550 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-12-14 09:03:13,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2022-12-14 09:03:13,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 247. [2022-12-14 09:03:13,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 247 states, 246 states have (on average 1.008130081300813) internal successors, (248), 246 states have internal predecessors, (248), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:03:13,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 248 transitions. [2022-12-14 09:03:13,196 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 248 transitions. Word has length 245 [2022-12-14 09:03:13,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:03:13,196 INFO L495 AbstractCegarLoop]: Abstraction has 247 states and 248 transitions. [2022-12-14 09:03:13,196 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 187 states, 187 states have (on average 2.3155080213903743) internal successors, (433), 186 states have internal predecessors, (433), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:03:13,196 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 248 transitions. [2022-12-14 09:03:13,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 247 [2022-12-14 09:03:13,196 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:03:13,197 INFO L195 NwaCegarLoop]: trace histogram [61, 61, 60, 60, 1, 1, 1, 1] [2022-12-14 09:03:13,201 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (121)] Ended with exit code 0 [2022-12-14 09:03:13,397 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 121 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable120 [2022-12-14 09:03:13,398 INFO L420 AbstractCegarLoop]: === Iteration 122 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:03:13,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:03:13,399 INFO L85 PathProgramCache]: Analyzing trace with hash 782415, now seen corresponding path program 120 times [2022-12-14 09:03:13,399 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:03:13,399 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1732125885] [2022-12-14 09:03:13,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:03:13,400 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:03:13,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:03:16,226 INFO L134 CoverageAnalysis]: Checked inductivity of 7321 backedges. 1830 proven. 5491 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:03:16,226 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:03:16,226 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1732125885] [2022-12-14 09:03:16,226 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1732125885] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:03:16,226 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1230368551] [2022-12-14 09:03:16,226 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 09:03:16,226 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:03:16,227 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:03:16,227 INFO L229 MonitoredProcess]: Starting monitored process 122 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:03:16,228 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (122)] Waiting until timeout for monitored process [2022-12-14 09:03:16,374 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 09:03:16,375 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:03:16,384 INFO L263 TraceCheckSpWp]: Trace formula consists of 943 conjuncts, 128 conjunts are in the unsatisfiable core [2022-12-14 09:03:16,386 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:03:16,565 INFO L134 CoverageAnalysis]: Checked inductivity of 7321 backedges. 1891 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:03:16,565 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:03:18,499 INFO L134 CoverageAnalysis]: Checked inductivity of 7321 backedges. 1891 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:03:18,499 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1230368551] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:03:18,500 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [211423487] [2022-12-14 09:03:18,500 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 09:03:18,500 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:03:18,501 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:03:18,501 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:03:18,501 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:03:18,542 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:03:18,777 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '171338#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:03:18,777 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:03:18,777 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:03:18,777 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64] total 66 [2022-12-14 09:03:18,777 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [881780119] [2022-12-14 09:03:18,777 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:03:18,777 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2022-12-14 09:03:18,777 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:03:18,778 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2022-12-14 09:03:18,778 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2045, Invalid=3067, Unknown=0, NotChecked=0, Total=5112 [2022-12-14 09:03:18,778 INFO L87 Difference]: Start difference. First operand 247 states and 248 transitions. Second operand has 67 states, 67 states have (on average 3.7313432835820897) internal successors, (250), 66 states have internal predecessors, (250), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:03:19,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:03:19,947 INFO L93 Difference]: Finished difference Result 258 states and 259 transitions. [2022-12-14 09:03:19,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 129 states. [2022-12-14 09:03:19,947 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 3.7313432835820897) internal successors, (250), 66 states have internal predecessors, (250), 0 states have call successors, (0), 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 246 [2022-12-14 09:03:19,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:03:19,948 INFO L225 Difference]: With dead ends: 258 [2022-12-14 09:03:19,948 INFO L226 Difference]: Without dead ends: 256 [2022-12-14 09:03:19,949 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 923 GetRequests, 668 SyntacticMatches, 122 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8546 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=6206, Invalid=11884, Unknown=0, NotChecked=0, Total=18090 [2022-12-14 09:03:19,949 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 254 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 595 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 254 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 598 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 595 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 09:03:19,949 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [254 Valid, 21 Invalid, 598 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 595 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 09:03:19,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2022-12-14 09:03:20,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 250. [2022-12-14 09:03:20,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 250 states, 249 states have (on average 1.0080321285140563) internal successors, (251), 249 states have internal predecessors, (251), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:03:20,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 250 states to 250 states and 251 transitions. [2022-12-14 09:03:20,028 INFO L78 Accepts]: Start accepts. Automaton has 250 states and 251 transitions. Word has length 246 [2022-12-14 09:03:20,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:03:20,028 INFO L495 AbstractCegarLoop]: Abstraction has 250 states and 251 transitions. [2022-12-14 09:03:20,028 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 3.7313432835820897) internal successors, (250), 66 states have internal predecessors, (250), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:03:20,029 INFO L276 IsEmpty]: Start isEmpty. Operand 250 states and 251 transitions. [2022-12-14 09:03:20,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2022-12-14 09:03:20,029 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:03:20,029 INFO L195 NwaCegarLoop]: trace histogram [62, 61, 61, 61, 1, 1, 1, 1] [2022-12-14 09:03:20,034 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (122)] Ended with exit code 0 [2022-12-14 09:03:20,230 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable121,122 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:03:20,230 INFO L420 AbstractCegarLoop]: === Iteration 123 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:03:20,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:03:20,231 INFO L85 PathProgramCache]: Analyzing trace with hash 1838909066, now seen corresponding path program 121 times [2022-12-14 09:03:20,231 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:03:20,232 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [723607808] [2022-12-14 09:03:20,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:03:20,232 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:03:20,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:03:25,234 INFO L134 CoverageAnalysis]: Checked inductivity of 7503 backedges. 5431 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:03:25,234 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:03:25,234 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [723607808] [2022-12-14 09:03:25,234 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [723607808] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:03:25,235 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1600167956] [2022-12-14 09:03:25,235 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 09:03:25,235 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:03:25,235 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:03:25,236 INFO L229 MonitoredProcess]: Starting monitored process 123 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:03:25,236 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (123)] Waiting until timeout for monitored process [2022-12-14 09:03:25,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:03:25,341 INFO L263 TraceCheckSpWp]: Trace formula consists of 953 conjuncts, 126 conjunts are in the unsatisfiable core [2022-12-14 09:03:25,344 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:03:29,752 INFO L134 CoverageAnalysis]: Checked inductivity of 7503 backedges. 5612 proven. 1891 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:03:29,752 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:03:32,620 INFO L134 CoverageAnalysis]: Checked inductivity of 7503 backedges. 5612 proven. 1891 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:03:32,620 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1600167956] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:03:32,620 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1293533882] [2022-12-14 09:03:32,620 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 09:03:32,621 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:03:32,621 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:03:32,621 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:03:32,621 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:03:32,661 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:03:33,071 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '174028#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:03:33,071 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:03:33,071 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:03:33,071 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [125, 125, 125] total 189 [2022-12-14 09:03:33,071 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [779801403] [2022-12-14 09:03:33,071 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:03:33,072 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 190 states [2022-12-14 09:03:33,072 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:03:33,073 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 190 interpolants. [2022-12-14 09:03:33,074 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8083, Invalid=29747, Unknown=0, NotChecked=0, Total=37830 [2022-12-14 09:03:33,074 INFO L87 Difference]: Start difference. First operand 250 states and 251 transitions. Second operand has 190 states, 190 states have (on average 2.3157894736842106) internal successors, (440), 189 states have internal predecessors, (440), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:03:35,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:03:35,621 INFO L93 Difference]: Finished difference Result 440 states and 442 transitions. [2022-12-14 09:03:35,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 126 states. [2022-12-14 09:03:35,621 INFO L78 Accepts]: Start accepts. Automaton has has 190 states, 190 states have (on average 2.3157894736842106) internal successors, (440), 189 states have internal predecessors, (440), 0 states have call successors, (0), 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 249 [2022-12-14 09:03:35,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:03:35,622 INFO L225 Difference]: With dead ends: 440 [2022-12-14 09:03:35,622 INFO L226 Difference]: Without dead ends: 251 [2022-12-14 09:03:35,624 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 932 GetRequests, 554 SyntacticMatches, 123 SemanticMatches, 255 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24783 ImplicationChecksByTransitivity, 11.9s TimeCoverageRelationStatistics Valid=14006, Invalid=51786, Unknown=0, NotChecked=0, Total=65792 [2022-12-14 09:03:35,624 INFO L413 NwaCegarLoop]: 63 mSDtfsCounter, 7 mSDsluCounter, 687 mSDsCounter, 0 mSdLazyCounter, 1522 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 750 SdHoareTripleChecker+Invalid, 1522 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1522 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-12-14 09:03:35,624 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 750 Invalid, 1522 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1522 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-12-14 09:03:35,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 251 states. [2022-12-14 09:03:35,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 251 to 251. [2022-12-14 09:03:35,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 251 states, 250 states have (on average 1.008) internal successors, (252), 250 states have internal predecessors, (252), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:03:35,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 252 transitions. [2022-12-14 09:03:35,703 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 252 transitions. Word has length 249 [2022-12-14 09:03:35,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:03:35,703 INFO L495 AbstractCegarLoop]: Abstraction has 251 states and 252 transitions. [2022-12-14 09:03:35,703 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 190 states, 190 states have (on average 2.3157894736842106) internal successors, (440), 189 states have internal predecessors, (440), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:03:35,703 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 252 transitions. [2022-12-14 09:03:35,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 251 [2022-12-14 09:03:35,704 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:03:35,704 INFO L195 NwaCegarLoop]: trace histogram [62, 62, 61, 61, 1, 1, 1, 1] [2022-12-14 09:03:35,709 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (123)] Ended with exit code 0 [2022-12-14 09:03:35,905 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 123 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable122 [2022-12-14 09:03:35,905 INFO L420 AbstractCegarLoop]: === Iteration 124 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:03:35,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:03:35,906 INFO L85 PathProgramCache]: Analyzing trace with hash 3660293, now seen corresponding path program 122 times [2022-12-14 09:03:35,906 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:03:35,906 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [434745895] [2022-12-14 09:03:35,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:03:35,907 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:03:36,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:03:38,733 INFO L134 CoverageAnalysis]: Checked inductivity of 7565 backedges. 1891 proven. 5674 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:03:38,733 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:03:38,733 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [434745895] [2022-12-14 09:03:38,733 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [434745895] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:03:38,733 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [212521589] [2022-12-14 09:03:38,733 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 09:03:38,733 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:03:38,733 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:03:38,734 INFO L229 MonitoredProcess]: Starting monitored process 124 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:03:38,735 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (124)] Waiting until timeout for monitored process [2022-12-14 09:03:39,080 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 62 check-sat command(s) [2022-12-14 09:03:39,080 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:03:39,086 INFO L263 TraceCheckSpWp]: Trace formula consists of 958 conjuncts, 130 conjunts are in the unsatisfiable core [2022-12-14 09:03:39,088 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:03:39,288 INFO L134 CoverageAnalysis]: Checked inductivity of 7565 backedges. 1953 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:03:39,288 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:03:41,046 INFO L134 CoverageAnalysis]: Checked inductivity of 7565 backedges. 1953 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:03:41,046 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [212521589] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:03:41,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [742733898] [2022-12-14 09:03:41,047 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 09:03:41,047 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:03:41,047 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:03:41,047 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:03:41,047 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:03:41,088 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:03:41,442 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '176907#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:03:41,442 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:03:41,442 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:03:41,442 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 67 [2022-12-14 09:03:41,443 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [799230555] [2022-12-14 09:03:41,443 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:03:41,443 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2022-12-14 09:03:41,443 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:03:41,444 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2022-12-14 09:03:41,444 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2109, Invalid=3147, Unknown=0, NotChecked=0, Total=5256 [2022-12-14 09:03:41,444 INFO L87 Difference]: Start difference. First operand 251 states and 252 transitions. Second operand has 68 states, 68 states have (on average 3.735294117647059) internal successors, (254), 67 states have internal predecessors, (254), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:03:42,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:03:42,991 INFO L93 Difference]: Finished difference Result 262 states and 263 transitions. [2022-12-14 09:03:42,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 131 states. [2022-12-14 09:03:42,992 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 3.735294117647059) internal successors, (254), 67 states have internal predecessors, (254), 0 states have call successors, (0), 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 250 [2022-12-14 09:03:42,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:03:42,992 INFO L225 Difference]: With dead ends: 262 [2022-12-14 09:03:42,992 INFO L226 Difference]: Without dead ends: 260 [2022-12-14 09:03:42,993 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 938 GetRequests, 679 SyntacticMatches, 124 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8810 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=6400, Invalid=12232, Unknown=0, NotChecked=0, Total=18632 [2022-12-14 09:03:42,993 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 256 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 620 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 256 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 623 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 620 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 09:03:42,993 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [256 Valid, 15 Invalid, 623 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 620 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 09:03:42,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2022-12-14 09:03:43,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 254. [2022-12-14 09:03:43,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 254 states, 253 states have (on average 1.007905138339921) internal successors, (255), 253 states have internal predecessors, (255), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:03:43,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254 states to 254 states and 255 transitions. [2022-12-14 09:03:43,074 INFO L78 Accepts]: Start accepts. Automaton has 254 states and 255 transitions. Word has length 250 [2022-12-14 09:03:43,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:03:43,074 INFO L495 AbstractCegarLoop]: Abstraction has 254 states and 255 transitions. [2022-12-14 09:03:43,074 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 68 states have (on average 3.735294117647059) internal successors, (254), 67 states have internal predecessors, (254), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:03:43,074 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states and 255 transitions. [2022-12-14 09:03:43,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 254 [2022-12-14 09:03:43,075 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:03:43,075 INFO L195 NwaCegarLoop]: trace histogram [63, 62, 62, 62, 1, 1, 1, 1] [2022-12-14 09:03:43,080 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (124)] Ended with exit code 0 [2022-12-14 09:03:43,276 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 124 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable123 [2022-12-14 09:03:43,276 INFO L420 AbstractCegarLoop]: === Iteration 125 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:03:43,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:03:43,277 INFO L85 PathProgramCache]: Analyzing trace with hash 1674426644, now seen corresponding path program 123 times [2022-12-14 09:03:43,277 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:03:43,278 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1200618475] [2022-12-14 09:03:43,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:03:43,278 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:03:43,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:03:48,265 INFO L134 CoverageAnalysis]: Checked inductivity of 7750 backedges. 5613 proven. 2137 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:03:48,265 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:03:48,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1200618475] [2022-12-14 09:03:48,265 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1200618475] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:03:48,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [577386319] [2022-12-14 09:03:48,265 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 09:03:48,265 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:03:48,266 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:03:48,266 INFO L229 MonitoredProcess]: Starting monitored process 125 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:03:48,267 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (125)] Waiting until timeout for monitored process [2022-12-14 09:03:48,403 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 09:03:48,404 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:03:48,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 968 conjuncts, 128 conjunts are in the unsatisfiable core [2022-12-14 09:03:48,416 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:03:52,104 INFO L134 CoverageAnalysis]: Checked inductivity of 7750 backedges. 5797 proven. 1953 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:03:52,104 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:03:55,389 INFO L134 CoverageAnalysis]: Checked inductivity of 7750 backedges. 5797 proven. 1953 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:03:55,389 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [577386319] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:03:55,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [955033553] [2022-12-14 09:03:55,390 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 09:03:55,390 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:03:55,390 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:03:55,390 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:03:55,390 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:03:55,430 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:03:56,130 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '179640#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:03:56,130 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:03:56,130 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:03:56,130 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [127, 127, 127] total 192 [2022-12-14 09:03:56,130 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1995201500] [2022-12-14 09:03:56,131 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:03:56,131 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 193 states [2022-12-14 09:03:56,131 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:03:56,132 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 193 interpolants. [2022-12-14 09:03:56,134 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8339, Invalid=30667, Unknown=0, NotChecked=0, Total=39006 [2022-12-14 09:03:56,134 INFO L87 Difference]: Start difference. First operand 254 states and 255 transitions. Second operand has 193 states, 193 states have (on average 2.316062176165803) internal successors, (447), 192 states have internal predecessors, (447), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:03:59,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:03:59,091 INFO L93 Difference]: Finished difference Result 447 states and 449 transitions. [2022-12-14 09:03:59,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 128 states. [2022-12-14 09:03:59,092 INFO L78 Accepts]: Start accepts. Automaton has has 193 states, 193 states have (on average 2.316062176165803) internal successors, (447), 192 states have internal predecessors, (447), 0 states have call successors, (0), 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 253 [2022-12-14 09:03:59,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:03:59,092 INFO L225 Difference]: With dead ends: 447 [2022-12-14 09:03:59,092 INFO L226 Difference]: Without dead ends: 255 [2022-12-14 09:03:59,095 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 947 GetRequests, 563 SyntacticMatches, 125 SemanticMatches, 259 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25561 ImplicationChecksByTransitivity, 12.2s TimeCoverageRelationStatistics Valid=14452, Invalid=53408, Unknown=0, NotChecked=0, Total=67860 [2022-12-14 09:03:59,095 INFO L413 NwaCegarLoop]: 64 mSDtfsCounter, 7 mSDsluCounter, 662 mSDsCounter, 0 mSdLazyCounter, 1486 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 726 SdHoareTripleChecker+Invalid, 1486 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1486 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 09:03:59,095 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 726 Invalid, 1486 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1486 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 09:03:59,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 255 states. [2022-12-14 09:03:59,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 255 to 255. [2022-12-14 09:03:59,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 255 states, 254 states have (on average 1.0078740157480315) internal successors, (256), 254 states have internal predecessors, (256), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:03:59,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 255 states to 255 states and 256 transitions. [2022-12-14 09:03:59,183 INFO L78 Accepts]: Start accepts. Automaton has 255 states and 256 transitions. Word has length 253 [2022-12-14 09:03:59,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:03:59,183 INFO L495 AbstractCegarLoop]: Abstraction has 255 states and 256 transitions. [2022-12-14 09:03:59,183 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 193 states, 193 states have (on average 2.316062176165803) internal successors, (447), 192 states have internal predecessors, (447), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:03:59,184 INFO L276 IsEmpty]: Start isEmpty. Operand 255 states and 256 transitions. [2022-12-14 09:03:59,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 255 [2022-12-14 09:03:59,184 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:03:59,184 INFO L195 NwaCegarLoop]: trace histogram [63, 63, 62, 62, 1, 1, 1, 1] [2022-12-14 09:03:59,189 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (125)] Ended with exit code 0 [2022-12-14 09:03:59,385 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 125 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable124 [2022-12-14 09:03:59,386 INFO L420 AbstractCegarLoop]: === Iteration 126 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:03:59,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:03:59,386 INFO L85 PathProgramCache]: Analyzing trace with hash -523380977, now seen corresponding path program 124 times [2022-12-14 09:03:59,387 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:03:59,387 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [208784758] [2022-12-14 09:03:59,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:03:59,388 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:03:59,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:04:02,282 INFO L134 CoverageAnalysis]: Checked inductivity of 7813 backedges. 1953 proven. 5860 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:04:02,282 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:04:02,282 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [208784758] [2022-12-14 09:04:02,282 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [208784758] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:04:02,282 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1646633114] [2022-12-14 09:04:02,283 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 09:04:02,283 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:04:02,283 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:04:02,283 INFO L229 MonitoredProcess]: Starting monitored process 126 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:04:02,284 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (126)] Waiting until timeout for monitored process [2022-12-14 09:04:02,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:04:02,393 INFO L263 TraceCheckSpWp]: Trace formula consists of 973 conjuncts, 132 conjunts are in the unsatisfiable core [2022-12-14 09:04:02,395 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:04:02,604 INFO L134 CoverageAnalysis]: Checked inductivity of 7813 backedges. 2016 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:04:02,604 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:04:04,681 INFO L134 CoverageAnalysis]: Checked inductivity of 7813 backedges. 2016 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:04:04,681 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1646633114] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:04:04,681 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1587577049] [2022-12-14 09:04:04,682 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 09:04:04,682 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:04:04,682 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:04:04,682 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:04:04,682 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:04:04,725 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:04:05,127 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '182565#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:04:05,127 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:04:05,127 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:04:05,127 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 66, 66] total 68 [2022-12-14 09:04:05,128 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [589884471] [2022-12-14 09:04:05,128 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:04:05,128 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2022-12-14 09:04:05,128 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:04:05,129 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2022-12-14 09:04:05,129 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2174, Invalid=3228, Unknown=0, NotChecked=0, Total=5402 [2022-12-14 09:04:05,129 INFO L87 Difference]: Start difference. First operand 255 states and 256 transitions. Second operand has 69 states, 69 states have (on average 3.739130434782609) internal successors, (258), 68 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) [2022-12-14 09:04:06,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:04:06,411 INFO L93 Difference]: Finished difference Result 266 states and 267 transitions. [2022-12-14 09:04:06,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 133 states. [2022-12-14 09:04:06,412 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 69 states have (on average 3.739130434782609) internal successors, (258), 68 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 254 [2022-12-14 09:04:06,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:04:06,412 INFO L225 Difference]: With dead ends: 266 [2022-12-14 09:04:06,412 INFO L226 Difference]: Without dead ends: 264 [2022-12-14 09:04:06,413 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 953 GetRequests, 690 SyntacticMatches, 126 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9078 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=6597, Invalid=12585, Unknown=0, NotChecked=0, Total=19182 [2022-12-14 09:04:06,414 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 134 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 672 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 134 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 675 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 672 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 09:04:06,414 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [134 Valid, 18 Invalid, 675 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 672 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 09:04:06,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 264 states. [2022-12-14 09:04:06,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 264 to 258. [2022-12-14 09:04:06,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 258 states, 257 states have (on average 1.0077821011673151) internal successors, (259), 257 states have internal predecessors, (259), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:04:06,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 258 states to 258 states and 259 transitions. [2022-12-14 09:04:06,498 INFO L78 Accepts]: Start accepts. Automaton has 258 states and 259 transitions. Word has length 254 [2022-12-14 09:04:06,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:04:06,498 INFO L495 AbstractCegarLoop]: Abstraction has 258 states and 259 transitions. [2022-12-14 09:04:06,498 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 69 states, 69 states have (on average 3.739130434782609) internal successors, (258), 68 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) [2022-12-14 09:04:06,498 INFO L276 IsEmpty]: Start isEmpty. Operand 258 states and 259 transitions. [2022-12-14 09:04:06,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 258 [2022-12-14 09:04:06,499 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:04:06,499 INFO L195 NwaCegarLoop]: trace histogram [64, 63, 63, 63, 1, 1, 1, 1] [2022-12-14 09:04:06,504 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (126)] Ended with exit code 0 [2022-12-14 09:04:06,699 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 126 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable125 [2022-12-14 09:04:06,700 INFO L420 AbstractCegarLoop]: === Iteration 127 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:04:06,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:04:06,701 INFO L85 PathProgramCache]: Analyzing trace with hash -1306581046, now seen corresponding path program 125 times [2022-12-14 09:04:06,701 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:04:06,701 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1074487102] [2022-12-14 09:04:06,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:04:06,702 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:04:06,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:04:11,906 INFO L134 CoverageAnalysis]: Checked inductivity of 8001 backedges. 5798 proven. 2203 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:04:11,906 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:04:11,906 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1074487102] [2022-12-14 09:04:11,906 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1074487102] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:04:11,906 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [90962019] [2022-12-14 09:04:11,906 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 09:04:11,906 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:04:11,907 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:04:11,907 INFO L229 MonitoredProcess]: Starting monitored process 127 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:04:11,908 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (127)] Waiting until timeout for monitored process [2022-12-14 09:04:12,243 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 64 check-sat command(s) [2022-12-14 09:04:12,243 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:04:12,249 INFO L263 TraceCheckSpWp]: Trace formula consists of 983 conjuncts, 130 conjunts are in the unsatisfiable core [2022-12-14 09:04:12,252 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:04:16,547 INFO L134 CoverageAnalysis]: Checked inductivity of 8001 backedges. 5985 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:04:16,547 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:04:19,803 INFO L134 CoverageAnalysis]: Checked inductivity of 8001 backedges. 5985 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:04:19,803 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [90962019] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:04:19,803 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [499646816] [2022-12-14 09:04:19,803 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 09:04:19,804 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:04:19,804 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:04:19,804 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:04:19,804 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:04:19,843 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:04:20,256 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '185341#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:04:20,256 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:04:20,256 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:04:20,256 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [129, 129, 129] total 195 [2022-12-14 09:04:20,256 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [764461922] [2022-12-14 09:04:20,256 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:04:20,257 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 196 states [2022-12-14 09:04:20,257 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:04:20,258 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 196 interpolants. [2022-12-14 09:04:20,260 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8599, Invalid=31601, Unknown=0, NotChecked=0, Total=40200 [2022-12-14 09:04:20,260 INFO L87 Difference]: Start difference. First operand 258 states and 259 transitions. Second operand has 196 states, 196 states have (on average 2.316326530612245) internal successors, (454), 195 states have internal predecessors, (454), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:04:22,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:04:22,779 INFO L93 Difference]: Finished difference Result 454 states and 456 transitions. [2022-12-14 09:04:22,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 130 states. [2022-12-14 09:04:22,779 INFO L78 Accepts]: Start accepts. Automaton has has 196 states, 196 states have (on average 2.316326530612245) internal successors, (454), 195 states have internal predecessors, (454), 0 states have call successors, (0), 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 257 [2022-12-14 09:04:22,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:04:22,780 INFO L225 Difference]: With dead ends: 454 [2022-12-14 09:04:22,780 INFO L226 Difference]: Without dead ends: 259 [2022-12-14 09:04:22,783 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 962 GetRequests, 572 SyntacticMatches, 127 SemanticMatches, 263 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26351 ImplicationChecksByTransitivity, 12.1s TimeCoverageRelationStatistics Valid=14905, Invalid=55055, Unknown=0, NotChecked=0, Total=69960 [2022-12-14 09:04:22,783 INFO L413 NwaCegarLoop]: 65 mSDtfsCounter, 7 mSDsluCounter, 623 mSDsCounter, 0 mSdLazyCounter, 1413 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 688 SdHoareTripleChecker+Invalid, 1413 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1413 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 09:04:22,783 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 688 Invalid, 1413 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1413 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 09:04:22,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2022-12-14 09:04:22,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 259. [2022-12-14 09:04:22,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 259 states, 258 states have (on average 1.0077519379844961) internal successors, (260), 258 states have internal predecessors, (260), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:04:22,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 260 transitions. [2022-12-14 09:04:22,874 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 260 transitions. Word has length 257 [2022-12-14 09:04:22,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:04:22,874 INFO L495 AbstractCegarLoop]: Abstraction has 259 states and 260 transitions. [2022-12-14 09:04:22,874 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 196 states, 196 states have (on average 2.316326530612245) internal successors, (454), 195 states have internal predecessors, (454), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:04:22,874 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 260 transitions. [2022-12-14 09:04:22,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 259 [2022-12-14 09:04:22,875 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:04:22,875 INFO L195 NwaCegarLoop]: trace histogram [64, 64, 63, 63, 1, 1, 1, 1] [2022-12-14 09:04:22,880 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (127)] Ended with exit code 0 [2022-12-14 09:04:23,075 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 127 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable126 [2022-12-14 09:04:23,077 INFO L420 AbstractCegarLoop]: === Iteration 128 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:04:23,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:04:23,078 INFO L85 PathProgramCache]: Analyzing trace with hash 1436143685, now seen corresponding path program 126 times [2022-12-14 09:04:23,078 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:04:23,078 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [696553493] [2022-12-14 09:04:23,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:04:23,079 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:04:23,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:04:26,190 INFO L134 CoverageAnalysis]: Checked inductivity of 8065 backedges. 2016 proven. 6049 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:04:26,190 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:04:26,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [696553493] [2022-12-14 09:04:26,190 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [696553493] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:04:26,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [131390944] [2022-12-14 09:04:26,190 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 09:04:26,191 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:04:26,191 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:04:26,191 INFO L229 MonitoredProcess]: Starting monitored process 128 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:04:26,192 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (128)] Waiting until timeout for monitored process [2022-12-14 09:04:26,335 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 09:04:26,335 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:04:26,345 INFO L263 TraceCheckSpWp]: Trace formula consists of 988 conjuncts, 134 conjunts are in the unsatisfiable core [2022-12-14 09:04:26,347 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:04:26,569 INFO L134 CoverageAnalysis]: Checked inductivity of 8065 backedges. 2080 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:04:26,569 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:04:28,566 INFO L134 CoverageAnalysis]: Checked inductivity of 8065 backedges. 2080 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:04:28,566 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [131390944] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:04:28,566 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [324667367] [2022-12-14 09:04:28,567 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 09:04:28,567 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:04:28,567 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:04:28,567 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:04:28,567 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:04:28,609 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:04:28,811 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '188312#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:04:28,811 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:04:28,811 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:04:28,811 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 69 [2022-12-14 09:04:28,811 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1166662733] [2022-12-14 09:04:28,811 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:04:28,812 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2022-12-14 09:04:28,812 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:04:28,812 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2022-12-14 09:04:28,812 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2240, Invalid=3310, Unknown=0, NotChecked=0, Total=5550 [2022-12-14 09:04:28,813 INFO L87 Difference]: Start difference. First operand 259 states and 260 transitions. Second operand has 70 states, 70 states have (on average 3.742857142857143) internal successors, (262), 69 states have internal predecessors, (262), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:04:29,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:04:29,824 INFO L93 Difference]: Finished difference Result 270 states and 271 transitions. [2022-12-14 09:04:29,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 135 states. [2022-12-14 09:04:29,825 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 3.742857142857143) internal successors, (262), 69 states have internal predecessors, (262), 0 states have call successors, (0), 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 258 [2022-12-14 09:04:29,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:04:29,826 INFO L225 Difference]: With dead ends: 270 [2022-12-14 09:04:29,826 INFO L226 Difference]: Without dead ends: 268 [2022-12-14 09:04:29,827 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 968 GetRequests, 701 SyntacticMatches, 128 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9350 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=6797, Invalid=12943, Unknown=0, NotChecked=0, Total=19740 [2022-12-14 09:04:29,827 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 266 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 648 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 266 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 651 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 648 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 09:04:29,827 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [266 Valid, 21 Invalid, 651 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 648 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 09:04:29,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2022-12-14 09:04:29,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 262. [2022-12-14 09:04:29,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 261 states have (on average 1.0076628352490422) internal successors, (263), 261 states have internal predecessors, (263), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:04:29,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 263 transitions. [2022-12-14 09:04:29,915 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 263 transitions. Word has length 258 [2022-12-14 09:04:29,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:04:29,915 INFO L495 AbstractCegarLoop]: Abstraction has 262 states and 263 transitions. [2022-12-14 09:04:29,915 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 70 states, 70 states have (on average 3.742857142857143) internal successors, (262), 69 states have internal predecessors, (262), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:04:29,915 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 263 transitions. [2022-12-14 09:04:29,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 262 [2022-12-14 09:04:29,916 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:04:29,916 INFO L195 NwaCegarLoop]: trace histogram [65, 64, 64, 64, 1, 1, 1, 1] [2022-12-14 09:04:29,921 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (128)] Ended with exit code 0 [2022-12-14 09:04:30,116 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable127,128 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:04:30,117 INFO L420 AbstractCegarLoop]: === Iteration 129 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:04:30,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:04:30,118 INFO L85 PathProgramCache]: Analyzing trace with hash 1992104660, now seen corresponding path program 127 times [2022-12-14 09:04:30,118 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:04:30,118 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [42262934] [2022-12-14 09:04:30,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:04:30,119 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:04:30,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:04:35,757 INFO L134 CoverageAnalysis]: Checked inductivity of 8256 backedges. 5986 proven. 2270 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:04:35,757 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:04:35,757 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [42262934] [2022-12-14 09:04:35,757 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [42262934] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:04:35,757 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [63931359] [2022-12-14 09:04:35,757 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 09:04:35,757 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:04:35,758 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:04:35,758 INFO L229 MonitoredProcess]: Starting monitored process 129 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:04:35,759 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (129)] Waiting until timeout for monitored process [2022-12-14 09:04:35,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:04:35,893 INFO L263 TraceCheckSpWp]: Trace formula consists of 998 conjuncts, 132 conjunts are in the unsatisfiable core [2022-12-14 09:04:35,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:04:40,953 INFO L134 CoverageAnalysis]: Checked inductivity of 8256 backedges. 6176 proven. 2080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:04:40,954 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:04:44,693 INFO L134 CoverageAnalysis]: Checked inductivity of 8256 backedges. 6176 proven. 2080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:04:44,693 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [63931359] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:04:44,693 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1810361225] [2022-12-14 09:04:44,694 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 09:04:44,694 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:04:44,694 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:04:44,694 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:04:44,694 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:04:44,735 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:04:45,161 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '191131#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:04:45,162 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:04:45,162 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:04:45,162 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [131, 131, 131] total 198 [2022-12-14 09:04:45,162 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1083958883] [2022-12-14 09:04:45,162 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:04:45,163 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 199 states [2022-12-14 09:04:45,163 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:04:45,165 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 199 interpolants. [2022-12-14 09:04:45,166 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8863, Invalid=32549, Unknown=0, NotChecked=0, Total=41412 [2022-12-14 09:04:45,167 INFO L87 Difference]: Start difference. First operand 262 states and 263 transitions. Second operand has 199 states, 199 states have (on average 2.3165829145728645) internal successors, (461), 198 states have internal predecessors, (461), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:04:48,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:04:48,308 INFO L93 Difference]: Finished difference Result 461 states and 463 transitions. [2022-12-14 09:04:48,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 132 states. [2022-12-14 09:04:48,308 INFO L78 Accepts]: Start accepts. Automaton has has 199 states, 199 states have (on average 2.3165829145728645) internal successors, (461), 198 states have internal predecessors, (461), 0 states have call successors, (0), 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 261 [2022-12-14 09:04:48,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:04:48,309 INFO L225 Difference]: With dead ends: 461 [2022-12-14 09:04:48,309 INFO L226 Difference]: Without dead ends: 263 [2022-12-14 09:04:48,312 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 977 GetRequests, 581 SyntacticMatches, 129 SemanticMatches, 267 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27153 ImplicationChecksByTransitivity, 14.1s TimeCoverageRelationStatistics Valid=15365, Invalid=56727, Unknown=0, NotChecked=0, Total=72092 [2022-12-14 09:04:48,312 INFO L413 NwaCegarLoop]: 66 mSDtfsCounter, 7 mSDsluCounter, 872 mSDsCounter, 0 mSdLazyCounter, 1905 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 938 SdHoareTripleChecker+Invalid, 1905 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1905 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-12-14 09:04:48,312 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 938 Invalid, 1905 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1905 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-12-14 09:04:48,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 263 states. [2022-12-14 09:04:48,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 263 to 263. [2022-12-14 09:04:48,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 263 states, 262 states have (on average 1.0076335877862594) internal successors, (264), 262 states have internal predecessors, (264), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:04:48,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 263 states to 263 states and 264 transitions. [2022-12-14 09:04:48,413 INFO L78 Accepts]: Start accepts. Automaton has 263 states and 264 transitions. Word has length 261 [2022-12-14 09:04:48,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:04:48,413 INFO L495 AbstractCegarLoop]: Abstraction has 263 states and 264 transitions. [2022-12-14 09:04:48,413 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 199 states, 199 states have (on average 2.3165829145728645) internal successors, (461), 198 states have internal predecessors, (461), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:04:48,413 INFO L276 IsEmpty]: Start isEmpty. Operand 263 states and 264 transitions. [2022-12-14 09:04:48,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 263 [2022-12-14 09:04:48,414 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:04:48,414 INFO L195 NwaCegarLoop]: trace histogram [65, 65, 64, 64, 1, 1, 1, 1] [2022-12-14 09:04:48,418 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (129)] Ended with exit code 0 [2022-12-14 09:04:48,614 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 129 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable128 [2022-12-14 09:04:48,615 INFO L420 AbstractCegarLoop]: === Iteration 130 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:04:48,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:04:48,616 INFO L85 PathProgramCache]: Analyzing trace with hash 325651919, now seen corresponding path program 128 times [2022-12-14 09:04:48,616 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:04:48,616 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1951655624] [2022-12-14 09:04:48,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:04:48,617 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:04:48,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:04:51,837 INFO L134 CoverageAnalysis]: Checked inductivity of 8321 backedges. 2080 proven. 6241 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:04:51,837 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:04:51,837 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1951655624] [2022-12-14 09:04:51,837 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1951655624] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:04:51,837 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [339923509] [2022-12-14 09:04:51,837 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 09:04:51,837 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:04:51,837 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:04:51,838 INFO L229 MonitoredProcess]: Starting monitored process 130 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:04:51,838 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (130)] Waiting until timeout for monitored process [2022-12-14 09:04:52,194 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 65 check-sat command(s) [2022-12-14 09:04:52,195 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:04:52,201 INFO L263 TraceCheckSpWp]: Trace formula consists of 1003 conjuncts, 136 conjunts are in the unsatisfiable core [2022-12-14 09:04:52,203 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:04:52,383 INFO L134 CoverageAnalysis]: Checked inductivity of 8321 backedges. 2145 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:04:52,383 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:04:54,372 INFO L134 CoverageAnalysis]: Checked inductivity of 8321 backedges. 2145 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:04:54,373 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [339923509] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:04:54,373 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1447774991] [2022-12-14 09:04:54,373 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 09:04:54,373 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:04:54,373 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:04:54,374 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:04:54,374 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:04:54,420 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:04:54,691 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '194148#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:04:54,691 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:04:54,691 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:04:54,692 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 70 [2022-12-14 09:04:54,692 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1120755968] [2022-12-14 09:04:54,692 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:04:54,692 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2022-12-14 09:04:54,692 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:04:54,693 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2022-12-14 09:04:54,693 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2307, Invalid=3393, Unknown=0, NotChecked=0, Total=5700 [2022-12-14 09:04:54,693 INFO L87 Difference]: Start difference. First operand 263 states and 264 transitions. Second operand has 71 states, 71 states have (on average 3.7464788732394365) internal successors, (266), 70 states have internal predecessors, (266), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:04:56,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:04:56,125 INFO L93 Difference]: Finished difference Result 274 states and 275 transitions. [2022-12-14 09:04:56,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 137 states. [2022-12-14 09:04:56,125 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 3.7464788732394365) internal successors, (266), 70 states have internal predecessors, (266), 0 states have call successors, (0), 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 262 [2022-12-14 09:04:56,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:04:56,126 INFO L225 Difference]: With dead ends: 274 [2022-12-14 09:04:56,126 INFO L226 Difference]: Without dead ends: 272 [2022-12-14 09:04:56,127 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 983 GetRequests, 712 SyntacticMatches, 130 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9626 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=7000, Invalid=13306, Unknown=0, NotChecked=0, Total=20306 [2022-12-14 09:04:56,127 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 268 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 655 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 268 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 658 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 655 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 09:04:56,127 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [268 Valid, 19 Invalid, 658 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 655 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 09:04:56,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 272 states. [2022-12-14 09:04:56,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 272 to 266. [2022-12-14 09:04:56,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 266 states, 265 states have (on average 1.0075471698113208) internal successors, (267), 265 states have internal predecessors, (267), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:04:56,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 266 states to 266 states and 267 transitions. [2022-12-14 09:04:56,216 INFO L78 Accepts]: Start accepts. Automaton has 266 states and 267 transitions. Word has length 262 [2022-12-14 09:04:56,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:04:56,217 INFO L495 AbstractCegarLoop]: Abstraction has 266 states and 267 transitions. [2022-12-14 09:04:56,217 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 3.7464788732394365) internal successors, (266), 70 states have internal predecessors, (266), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:04:56,217 INFO L276 IsEmpty]: Start isEmpty. Operand 266 states and 267 transitions. [2022-12-14 09:04:56,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 266 [2022-12-14 09:04:56,217 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:04:56,218 INFO L195 NwaCegarLoop]: trace histogram [66, 65, 65, 65, 1, 1, 1, 1] [2022-12-14 09:04:56,222 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (130)] Ended with exit code 0 [2022-12-14 09:04:56,418 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 130 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable129 [2022-12-14 09:04:56,419 INFO L420 AbstractCegarLoop]: === Iteration 131 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:04:56,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:04:56,420 INFO L85 PathProgramCache]: Analyzing trace with hash -829982454, now seen corresponding path program 129 times [2022-12-14 09:04:56,420 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:04:56,420 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1579316063] [2022-12-14 09:04:56,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:04:56,421 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:04:56,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:05:02,240 INFO L134 CoverageAnalysis]: Checked inductivity of 8515 backedges. 6177 proven. 2338 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:05:02,240 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:05:02,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1579316063] [2022-12-14 09:05:02,240 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1579316063] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:05:02,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [899891153] [2022-12-14 09:05:02,240 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 09:05:02,240 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:05:02,240 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:05:02,241 INFO L229 MonitoredProcess]: Starting monitored process 131 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:05:02,242 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (131)] Waiting until timeout for monitored process [2022-12-14 09:05:02,388 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 09:05:02,388 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:05:02,400 INFO L263 TraceCheckSpWp]: Trace formula consists of 1013 conjuncts, 134 conjunts are in the unsatisfiable core [2022-12-14 09:05:02,402 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:05:07,572 INFO L134 CoverageAnalysis]: Checked inductivity of 8515 backedges. 6370 proven. 2145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:05:07,572 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:05:10,750 INFO L134 CoverageAnalysis]: Checked inductivity of 8515 backedges. 6370 proven. 2145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:05:10,750 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [899891153] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:05:10,751 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1983536918] [2022-12-14 09:05:10,751 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 09:05:10,751 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:05:10,751 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:05:10,752 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:05:10,752 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:05:10,793 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:05:11,389 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '197010#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:05:11,389 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:05:11,389 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:05:11,389 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [133, 133, 133] total 201 [2022-12-14 09:05:11,389 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1377832720] [2022-12-14 09:05:11,389 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:05:11,390 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 202 states [2022-12-14 09:05:11,390 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:05:11,391 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 202 interpolants. [2022-12-14 09:05:11,393 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9131, Invalid=33511, Unknown=0, NotChecked=0, Total=42642 [2022-12-14 09:05:11,393 INFO L87 Difference]: Start difference. First operand 266 states and 267 transitions. Second operand has 202 states, 202 states have (on average 2.3168316831683167) internal successors, (468), 201 states have internal predecessors, (468), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:05:14,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:05:14,812 INFO L93 Difference]: Finished difference Result 468 states and 470 transitions. [2022-12-14 09:05:14,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 134 states. [2022-12-14 09:05:14,812 INFO L78 Accepts]: Start accepts. Automaton has has 202 states, 202 states have (on average 2.3168316831683167) internal successors, (468), 201 states have internal predecessors, (468), 0 states have call successors, (0), 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 265 [2022-12-14 09:05:14,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:05:14,813 INFO L225 Difference]: With dead ends: 468 [2022-12-14 09:05:14,813 INFO L226 Difference]: Without dead ends: 267 [2022-12-14 09:05:14,816 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 992 GetRequests, 590 SyntacticMatches, 131 SemanticMatches, 271 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27967 ImplicationChecksByTransitivity, 14.3s TimeCoverageRelationStatistics Valid=15832, Invalid=58424, Unknown=0, NotChecked=0, Total=74256 [2022-12-14 09:05:14,816 INFO L413 NwaCegarLoop]: 67 mSDtfsCounter, 7 mSDsluCounter, 631 mSDsCounter, 0 mSdLazyCounter, 1444 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 698 SdHoareTripleChecker+Invalid, 1444 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1444 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-12-14 09:05:14,816 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 698 Invalid, 1444 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1444 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-12-14 09:05:14,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2022-12-14 09:05:14,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 267. [2022-12-14 09:05:14,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 267 states, 266 states have (on average 1.0075187969924813) internal successors, (268), 266 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) [2022-12-14 09:05:14,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 267 states to 267 states and 268 transitions. [2022-12-14 09:05:14,914 INFO L78 Accepts]: Start accepts. Automaton has 267 states and 268 transitions. Word has length 265 [2022-12-14 09:05:14,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:05:14,914 INFO L495 AbstractCegarLoop]: Abstraction has 267 states and 268 transitions. [2022-12-14 09:05:14,915 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 202 states, 202 states have (on average 2.3168316831683167) internal successors, (468), 201 states have internal predecessors, (468), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:05:14,915 INFO L276 IsEmpty]: Start isEmpty. Operand 267 states and 268 transitions. [2022-12-14 09:05:14,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 267 [2022-12-14 09:05:14,915 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:05:14,915 INFO L195 NwaCegarLoop]: trace histogram [66, 66, 65, 65, 1, 1, 1, 1] [2022-12-14 09:05:14,920 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (131)] Ended with exit code 0 [2022-12-14 09:05:15,116 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable130,131 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:05:15,116 INFO L420 AbstractCegarLoop]: === Iteration 132 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:05:15,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:05:15,117 INFO L85 PathProgramCache]: Analyzing trace with hash 2109437573, now seen corresponding path program 130 times [2022-12-14 09:05:15,117 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:05:15,118 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2024133499] [2022-12-14 09:05:15,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:05:15,118 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:05:15,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:05:18,514 INFO L134 CoverageAnalysis]: Checked inductivity of 8581 backedges. 2145 proven. 6436 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:05:18,514 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:05:18,514 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2024133499] [2022-12-14 09:05:18,514 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2024133499] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:05:18,515 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1541354336] [2022-12-14 09:05:18,515 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 09:05:18,515 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:05:18,515 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:05:18,516 INFO L229 MonitoredProcess]: Starting monitored process 132 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:05:18,516 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (132)] Waiting until timeout for monitored process [2022-12-14 09:05:18,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:05:18,634 INFO L263 TraceCheckSpWp]: Trace formula consists of 1018 conjuncts, 138 conjunts are in the unsatisfiable core [2022-12-14 09:05:18,637 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:05:18,865 INFO L134 CoverageAnalysis]: Checked inductivity of 8581 backedges. 2211 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:05:18,865 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:05:21,125 INFO L134 CoverageAnalysis]: Checked inductivity of 8581 backedges. 2211 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:05:21,125 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1541354336] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:05:21,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1534457007] [2022-12-14 09:05:21,126 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 09:05:21,126 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:05:21,126 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:05:21,126 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:05:21,126 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:05:21,177 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:05:21,460 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '200073#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:05:21,460 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:05:21,460 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:05:21,460 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 71 [2022-12-14 09:05:21,460 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1523298686] [2022-12-14 09:05:21,460 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:05:21,461 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 72 states [2022-12-14 09:05:21,461 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:05:21,462 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2022-12-14 09:05:21,462 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2375, Invalid=3477, Unknown=0, NotChecked=0, Total=5852 [2022-12-14 09:05:21,462 INFO L87 Difference]: Start difference. First operand 267 states and 268 transitions. Second operand has 72 states, 72 states have (on average 3.75) internal successors, (270), 71 states have internal predecessors, (270), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:05:22,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:05:22,758 INFO L93 Difference]: Finished difference Result 278 states and 279 transitions. [2022-12-14 09:05:22,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2022-12-14 09:05:22,758 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 72 states have (on average 3.75) internal successors, (270), 71 states have internal predecessors, (270), 0 states have call successors, (0), 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 266 [2022-12-14 09:05:22,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:05:22,759 INFO L225 Difference]: With dead ends: 278 [2022-12-14 09:05:22,759 INFO L226 Difference]: Without dead ends: 276 [2022-12-14 09:05:22,760 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 998 GetRequests, 723 SyntacticMatches, 132 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9906 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=7206, Invalid=13674, Unknown=0, NotChecked=0, Total=20880 [2022-12-14 09:05:22,760 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 142 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 759 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 142 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 762 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 759 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 09:05:22,761 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [142 Valid, 24 Invalid, 762 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 759 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 09:05:22,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 276 states. [2022-12-14 09:05:22,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 276 to 270. [2022-12-14 09:05:22,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 270 states, 269 states have (on average 1.0074349442379182) internal successors, (271), 269 states have internal predecessors, (271), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:05:22,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 271 transitions. [2022-12-14 09:05:22,859 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 271 transitions. Word has length 266 [2022-12-14 09:05:22,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:05:22,859 INFO L495 AbstractCegarLoop]: Abstraction has 270 states and 271 transitions. [2022-12-14 09:05:22,859 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 72 states, 72 states have (on average 3.75) internal successors, (270), 71 states have internal predecessors, (270), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:05:22,859 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 271 transitions. [2022-12-14 09:05:22,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 270 [2022-12-14 09:05:22,860 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:05:22,860 INFO L195 NwaCegarLoop]: trace histogram [67, 66, 66, 66, 1, 1, 1, 1] [2022-12-14 09:05:22,865 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (132)] Ended with exit code 0 [2022-12-14 09:05:23,060 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 132 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable131 [2022-12-14 09:05:23,061 INFO L420 AbstractCegarLoop]: === Iteration 133 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:05:23,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:05:23,062 INFO L85 PathProgramCache]: Analyzing trace with hash -1701917548, now seen corresponding path program 131 times [2022-12-14 09:05:23,062 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:05:23,062 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [479425044] [2022-12-14 09:05:23,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:05:23,063 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:05:23,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:05:28,734 INFO L134 CoverageAnalysis]: Checked inductivity of 8778 backedges. 6371 proven. 2407 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:05:28,735 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:05:28,735 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [479425044] [2022-12-14 09:05:28,735 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [479425044] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:05:28,735 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1098698810] [2022-12-14 09:05:28,735 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 09:05:28,735 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:05:28,735 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:05:28,736 INFO L229 MonitoredProcess]: Starting monitored process 133 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:05:28,736 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (133)] Waiting until timeout for monitored process [2022-12-14 09:05:29,137 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 67 check-sat command(s) [2022-12-14 09:05:29,137 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:05:29,144 INFO L263 TraceCheckSpWp]: Trace formula consists of 1028 conjuncts, 136 conjunts are in the unsatisfiable core [2022-12-14 09:05:29,147 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:05:33,530 INFO L134 CoverageAnalysis]: Checked inductivity of 8778 backedges. 6567 proven. 2211 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:05:33,530 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:05:36,911 INFO L134 CoverageAnalysis]: Checked inductivity of 8778 backedges. 6567 proven. 2211 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:05:36,911 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1098698810] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:05:36,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1816193654] [2022-12-14 09:05:36,912 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 09:05:36,912 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:05:36,912 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:05:36,912 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:05:36,912 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:05:36,959 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:05:37,613 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '202978#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:05:37,614 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:05:37,614 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:05:37,614 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [135, 135, 135] total 204 [2022-12-14 09:05:37,614 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [888173170] [2022-12-14 09:05:37,614 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:05:37,614 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 205 states [2022-12-14 09:05:37,614 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:05:37,616 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 205 interpolants. [2022-12-14 09:05:37,617 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9403, Invalid=34487, Unknown=0, NotChecked=0, Total=43890 [2022-12-14 09:05:37,617 INFO L87 Difference]: Start difference. First operand 270 states and 271 transitions. Second operand has 205 states, 205 states have (on average 2.317073170731707) internal successors, (475), 204 states have internal predecessors, (475), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:05:41,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:05:41,051 INFO L93 Difference]: Finished difference Result 475 states and 477 transitions. [2022-12-14 09:05:41,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 136 states. [2022-12-14 09:05:41,052 INFO L78 Accepts]: Start accepts. Automaton has has 205 states, 205 states have (on average 2.317073170731707) internal successors, (475), 204 states have internal predecessors, (475), 0 states have call successors, (0), 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 269 [2022-12-14 09:05:41,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:05:41,052 INFO L225 Difference]: With dead ends: 475 [2022-12-14 09:05:41,052 INFO L226 Difference]: Without dead ends: 271 [2022-12-14 09:05:41,055 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1007 GetRequests, 599 SyntacticMatches, 133 SemanticMatches, 275 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28793 ImplicationChecksByTransitivity, 13.5s TimeCoverageRelationStatistics Valid=16306, Invalid=60146, Unknown=0, NotChecked=0, Total=76452 [2022-12-14 09:05:41,056 INFO L413 NwaCegarLoop]: 68 mSDtfsCounter, 7 mSDsluCounter, 668 mSDsCounter, 0 mSdLazyCounter, 1512 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 736 SdHoareTripleChecker+Invalid, 1512 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1512 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-12-14 09:05:41,056 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 736 Invalid, 1512 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1512 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-12-14 09:05:41,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 271 states. [2022-12-14 09:05:41,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 271 to 271. [2022-12-14 09:05:41,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 271 states, 270 states have (on average 1.0074074074074073) internal successors, (272), 270 states have internal predecessors, (272), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:05:41,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 271 states to 271 states and 272 transitions. [2022-12-14 09:05:41,157 INFO L78 Accepts]: Start accepts. Automaton has 271 states and 272 transitions. Word has length 269 [2022-12-14 09:05:41,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:05:41,157 INFO L495 AbstractCegarLoop]: Abstraction has 271 states and 272 transitions. [2022-12-14 09:05:41,157 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 205 states, 205 states have (on average 2.317073170731707) internal successors, (475), 204 states have internal predecessors, (475), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:05:41,157 INFO L276 IsEmpty]: Start isEmpty. Operand 271 states and 272 transitions. [2022-12-14 09:05:41,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 271 [2022-12-14 09:05:41,158 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:05:41,158 INFO L195 NwaCegarLoop]: trace histogram [67, 67, 66, 66, 1, 1, 1, 1] [2022-12-14 09:05:41,163 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (133)] Forceful destruction successful, exit code 0 [2022-12-14 09:05:41,358 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable132,133 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:05:41,359 INFO L420 AbstractCegarLoop]: === Iteration 134 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:05:41,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:05:41,360 INFO L85 PathProgramCache]: Analyzing trace with hash 1816237199, now seen corresponding path program 132 times [2022-12-14 09:05:41,360 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:05:41,360 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1068401084] [2022-12-14 09:05:41,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:05:41,361 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:05:41,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:05:45,081 INFO L134 CoverageAnalysis]: Checked inductivity of 8845 backedges. 2211 proven. 6634 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:05:45,081 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:05:45,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1068401084] [2022-12-14 09:05:45,082 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1068401084] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:05:45,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1759013321] [2022-12-14 09:05:45,082 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 09:05:45,082 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:05:45,082 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:05:45,083 INFO L229 MonitoredProcess]: Starting monitored process 134 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:05:45,083 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (134)] Waiting until timeout for monitored process [2022-12-14 09:05:45,268 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 09:05:45,268 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:05:45,279 INFO L263 TraceCheckSpWp]: Trace formula consists of 1033 conjuncts, 140 conjunts are in the unsatisfiable core [2022-12-14 09:05:45,282 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:05:45,497 INFO L134 CoverageAnalysis]: Checked inductivity of 8845 backedges. 2278 proven. 6567 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:05:45,497 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:05:47,901 INFO L134 CoverageAnalysis]: Checked inductivity of 8845 backedges. 2278 proven. 6567 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:05:47,901 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1759013321] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:05:47,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1158872494] [2022-12-14 09:05:47,901 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 09:05:47,901 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:05:47,901 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:05:47,902 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:05:47,902 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:05:47,941 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:05:48,234 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '206087#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:05:48,234 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:05:48,234 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:05:48,234 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70, 70] total 72 [2022-12-14 09:05:48,234 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1046321538] [2022-12-14 09:05:48,234 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:05:48,235 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2022-12-14 09:05:48,235 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:05:48,235 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2022-12-14 09:05:48,235 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2444, Invalid=3562, Unknown=0, NotChecked=0, Total=6006 [2022-12-14 09:05:48,236 INFO L87 Difference]: Start difference. First operand 271 states and 272 transitions. Second operand has 73 states, 73 states have (on average 3.7534246575342465) internal successors, (274), 72 states have internal predecessors, (274), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:05:49,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:05:49,404 INFO L93 Difference]: Finished difference Result 282 states and 283 transitions. [2022-12-14 09:05:49,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 141 states. [2022-12-14 09:05:49,404 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 3.7534246575342465) internal successors, (274), 72 states have internal predecessors, (274), 0 states have call successors, (0), 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 270 [2022-12-14 09:05:49,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:05:49,405 INFO L225 Difference]: With dead ends: 282 [2022-12-14 09:05:49,405 INFO L226 Difference]: Without dead ends: 280 [2022-12-14 09:05:49,406 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1013 GetRequests, 734 SyntacticMatches, 134 SemanticMatches, 145 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10190 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=7415, Invalid=14047, Unknown=0, NotChecked=0, Total=21462 [2022-12-14 09:05:49,406 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 276 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 686 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 276 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 689 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 686 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 09:05:49,406 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [276 Valid, 15 Invalid, 689 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 686 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 09:05:49,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 280 states. [2022-12-14 09:05:49,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 280 to 274. [2022-12-14 09:05:49,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 274 states, 273 states have (on average 1.0073260073260073) internal successors, (275), 273 states have internal predecessors, (275), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:05:49,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 274 states to 274 states and 275 transitions. [2022-12-14 09:05:49,501 INFO L78 Accepts]: Start accepts. Automaton has 274 states and 275 transitions. Word has length 270 [2022-12-14 09:05:49,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:05:49,501 INFO L495 AbstractCegarLoop]: Abstraction has 274 states and 275 transitions. [2022-12-14 09:05:49,501 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 3.7534246575342465) internal successors, (274), 72 states have internal predecessors, (274), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:05:49,501 INFO L276 IsEmpty]: Start isEmpty. Operand 274 states and 275 transitions. [2022-12-14 09:05:49,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 274 [2022-12-14 09:05:49,502 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:05:49,502 INFO L195 NwaCegarLoop]: trace histogram [68, 67, 67, 67, 1, 1, 1, 1] [2022-12-14 09:05:49,507 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (134)] Ended with exit code 0 [2022-12-14 09:05:49,703 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 134 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable133 [2022-12-14 09:05:49,703 INFO L420 AbstractCegarLoop]: === Iteration 135 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:05:49,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:05:49,704 INFO L85 PathProgramCache]: Analyzing trace with hash -470779318, now seen corresponding path program 133 times [2022-12-14 09:05:49,704 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:05:49,704 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1509519301] [2022-12-14 09:05:49,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:05:49,705 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:05:49,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:05:55,417 INFO L134 CoverageAnalysis]: Checked inductivity of 9045 backedges. 6568 proven. 2477 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:05:55,417 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:05:55,417 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1509519301] [2022-12-14 09:05:55,417 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1509519301] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:05:55,417 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1247928792] [2022-12-14 09:05:55,417 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 09:05:55,417 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:05:55,418 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:05:55,418 INFO L229 MonitoredProcess]: Starting monitored process 135 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:05:55,419 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (135)] Waiting until timeout for monitored process [2022-12-14 09:05:55,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:05:55,556 INFO L263 TraceCheckSpWp]: Trace formula consists of 1043 conjuncts, 138 conjunts are in the unsatisfiable core [2022-12-14 09:05:55,558 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:06:00,125 INFO L134 CoverageAnalysis]: Checked inductivity of 9045 backedges. 6767 proven. 2278 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:06:00,126 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:06:03,473 INFO L134 CoverageAnalysis]: Checked inductivity of 9045 backedges. 6767 proven. 2278 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:06:03,473 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1247928792] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:06:03,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1140862403] [2022-12-14 09:06:03,474 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 09:06:03,474 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:06:03,474 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:06:03,474 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:06:03,474 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:06:03,526 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:06:04,109 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '209035#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:06:04,110 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:06:04,110 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:06:04,110 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [137, 137, 137] total 207 [2022-12-14 09:06:04,110 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1689572476] [2022-12-14 09:06:04,110 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:06:04,110 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 208 states [2022-12-14 09:06:04,110 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:06:04,112 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 208 interpolants. [2022-12-14 09:06:04,114 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9679, Invalid=35477, Unknown=0, NotChecked=0, Total=45156 [2022-12-14 09:06:04,114 INFO L87 Difference]: Start difference. First operand 274 states and 275 transitions. Second operand has 208 states, 208 states have (on average 2.3173076923076925) internal successors, (482), 207 states have internal predecessors, (482), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:06:07,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:06:07,161 INFO L93 Difference]: Finished difference Result 482 states and 484 transitions. [2022-12-14 09:06:07,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 138 states. [2022-12-14 09:06:07,161 INFO L78 Accepts]: Start accepts. Automaton has has 208 states, 208 states have (on average 2.3173076923076925) internal successors, (482), 207 states have internal predecessors, (482), 0 states have call successors, (0), 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 273 [2022-12-14 09:06:07,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:06:07,161 INFO L225 Difference]: With dead ends: 482 [2022-12-14 09:06:07,161 INFO L226 Difference]: Without dead ends: 275 [2022-12-14 09:06:07,164 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1022 GetRequests, 608 SyntacticMatches, 135 SemanticMatches, 279 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29631 ImplicationChecksByTransitivity, 13.1s TimeCoverageRelationStatistics Valid=16787, Invalid=61893, Unknown=0, NotChecked=0, Total=78680 [2022-12-14 09:06:07,164 INFO L413 NwaCegarLoop]: 69 mSDtfsCounter, 7 mSDsluCounter, 958 mSDsCounter, 0 mSdLazyCounter, 2084 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 1027 SdHoareTripleChecker+Invalid, 2084 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 2084 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-12-14 09:06:07,164 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 1027 Invalid, 2084 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 2084 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-12-14 09:06:07,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 275 states. [2022-12-14 09:06:07,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 275 to 275. [2022-12-14 09:06:07,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 275 states, 274 states have (on average 1.0072992700729928) internal successors, (276), 274 states have internal predecessors, (276), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:06:07,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 275 states to 275 states and 276 transitions. [2022-12-14 09:06:07,259 INFO L78 Accepts]: Start accepts. Automaton has 275 states and 276 transitions. Word has length 273 [2022-12-14 09:06:07,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:06:07,259 INFO L495 AbstractCegarLoop]: Abstraction has 275 states and 276 transitions. [2022-12-14 09:06:07,259 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 208 states, 208 states have (on average 2.3173076923076925) internal successors, (482), 207 states have internal predecessors, (482), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:06:07,259 INFO L276 IsEmpty]: Start isEmpty. Operand 275 states and 276 transitions. [2022-12-14 09:06:07,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 275 [2022-12-14 09:06:07,260 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:06:07,260 INFO L195 NwaCegarLoop]: trace histogram [68, 68, 67, 67, 1, 1, 1, 1] [2022-12-14 09:06:07,265 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (135)] Ended with exit code 0 [2022-12-14 09:06:07,461 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 135 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable134 [2022-12-14 09:06:07,461 INFO L420 AbstractCegarLoop]: === Iteration 136 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:06:07,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:06:07,462 INFO L85 PathProgramCache]: Analyzing trace with hash -1900491579, now seen corresponding path program 134 times [2022-12-14 09:06:07,462 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:06:07,463 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1696703062] [2022-12-14 09:06:07,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:06:07,463 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:06:07,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:06:10,874 INFO L134 CoverageAnalysis]: Checked inductivity of 9113 backedges. 2278 proven. 6835 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:06:10,874 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:06:10,874 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1696703062] [2022-12-14 09:06:10,874 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1696703062] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:06:10,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [859519026] [2022-12-14 09:06:10,875 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 09:06:10,875 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:06:10,875 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:06:10,876 INFO L229 MonitoredProcess]: Starting monitored process 136 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:06:10,876 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (136)] Waiting until timeout for monitored process [2022-12-14 09:06:11,241 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 68 check-sat command(s) [2022-12-14 09:06:11,241 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:06:11,248 INFO L263 TraceCheckSpWp]: Trace formula consists of 1048 conjuncts, 142 conjunts are in the unsatisfiable core [2022-12-14 09:06:11,251 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:06:11,511 INFO L134 CoverageAnalysis]: Checked inductivity of 9113 backedges. 2346 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:06:11,511 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:06:14,044 INFO L134 CoverageAnalysis]: Checked inductivity of 9113 backedges. 2346 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:06:14,044 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [859519026] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:06:14,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1531508224] [2022-12-14 09:06:14,044 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 09:06:14,044 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:06:14,044 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:06:14,045 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:06:14,045 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:06:14,085 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:06:14,387 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '212190#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:06:14,387 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:06:14,387 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:06:14,387 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 73 [2022-12-14 09:06:14,387 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2095770524] [2022-12-14 09:06:14,387 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:06:14,387 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2022-12-14 09:06:14,387 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:06:14,388 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2022-12-14 09:06:14,388 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2514, Invalid=3648, Unknown=0, NotChecked=0, Total=6162 [2022-12-14 09:06:14,388 INFO L87 Difference]: Start difference. First operand 275 states and 276 transitions. Second operand has 74 states, 74 states have (on average 3.7567567567567566) internal successors, (278), 73 states have internal predecessors, (278), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:06:15,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:06:15,846 INFO L93 Difference]: Finished difference Result 286 states and 287 transitions. [2022-12-14 09:06:15,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 143 states. [2022-12-14 09:06:15,846 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 3.7567567567567566) internal successors, (278), 73 states have internal predecessors, (278), 0 states have call successors, (0), 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 274 [2022-12-14 09:06:15,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:06:15,847 INFO L225 Difference]: With dead ends: 286 [2022-12-14 09:06:15,847 INFO L226 Difference]: Without dead ends: 284 [2022-12-14 09:06:15,848 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1028 GetRequests, 745 SyntacticMatches, 136 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10478 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=7627, Invalid=14425, Unknown=0, NotChecked=0, Total=22052 [2022-12-14 09:06:15,848 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 146 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 813 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 816 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 813 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 09:06:15,848 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [146 Valid, 20 Invalid, 816 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 813 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 09:06:15,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 284 states. [2022-12-14 09:06:15,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 284 to 278. [2022-12-14 09:06:15,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 278 states, 277 states have (on average 1.0072202166064983) internal successors, (279), 277 states have internal predecessors, (279), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:06:15,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 278 states to 278 states and 279 transitions. [2022-12-14 09:06:15,945 INFO L78 Accepts]: Start accepts. Automaton has 278 states and 279 transitions. Word has length 274 [2022-12-14 09:06:15,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:06:15,945 INFO L495 AbstractCegarLoop]: Abstraction has 278 states and 279 transitions. [2022-12-14 09:06:15,946 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 74 states have (on average 3.7567567567567566) internal successors, (278), 73 states have internal predecessors, (278), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:06:15,946 INFO L276 IsEmpty]: Start isEmpty. Operand 278 states and 279 transitions. [2022-12-14 09:06:15,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 278 [2022-12-14 09:06:15,946 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:06:15,946 INFO L195 NwaCegarLoop]: trace histogram [69, 68, 68, 68, 1, 1, 1, 1] [2022-12-14 09:06:15,951 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (136)] Ended with exit code 0 [2022-12-14 09:06:16,147 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 136 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable135 [2022-12-14 09:06:16,147 INFO L420 AbstractCegarLoop]: === Iteration 137 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:06:16,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:06:16,148 INFO L85 PathProgramCache]: Analyzing trace with hash -1280913836, now seen corresponding path program 135 times [2022-12-14 09:06:16,149 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:06:16,149 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1255456311] [2022-12-14 09:06:16,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:06:16,149 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:06:16,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:06:21,913 INFO L134 CoverageAnalysis]: Checked inductivity of 9316 backedges. 6768 proven. 2548 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:06:21,913 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:06:21,913 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1255456311] [2022-12-14 09:06:21,914 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1255456311] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:06:21,914 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1758030926] [2022-12-14 09:06:21,914 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 09:06:21,914 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:06:21,914 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:06:21,915 INFO L229 MonitoredProcess]: Starting monitored process 137 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:06:21,915 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (137)] Waiting until timeout for monitored process [2022-12-14 09:06:22,067 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 09:06:22,068 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:06:22,079 INFO L263 TraceCheckSpWp]: Trace formula consists of 1058 conjuncts, 140 conjunts are in the unsatisfiable core [2022-12-14 09:06:22,082 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:06:27,344 INFO L134 CoverageAnalysis]: Checked inductivity of 9316 backedges. 6970 proven. 2346 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:06:27,345 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:06:31,738 INFO L134 CoverageAnalysis]: Checked inductivity of 9316 backedges. 6970 proven. 2346 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:06:31,738 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1758030926] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:06:31,738 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [735393071] [2022-12-14 09:06:31,739 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 09:06:31,739 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:06:31,739 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:06:31,739 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:06:31,739 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:06:31,784 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:06:32,501 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '215181#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:06:32,501 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:06:32,501 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:06:32,501 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [139, 139, 139] total 210 [2022-12-14 09:06:32,502 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [961548832] [2022-12-14 09:06:32,502 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:06:32,502 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 211 states [2022-12-14 09:06:32,502 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:06:32,504 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 211 interpolants. [2022-12-14 09:06:32,506 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9959, Invalid=36481, Unknown=0, NotChecked=0, Total=46440 [2022-12-14 09:06:32,506 INFO L87 Difference]: Start difference. First operand 278 states and 279 transitions. Second operand has 211 states, 211 states have (on average 2.3175355450236967) internal successors, (489), 210 states have internal predecessors, (489), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:06:36,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:06:36,248 INFO L93 Difference]: Finished difference Result 489 states and 491 transitions. [2022-12-14 09:06:36,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 140 states. [2022-12-14 09:06:36,248 INFO L78 Accepts]: Start accepts. Automaton has has 211 states, 211 states have (on average 2.3175355450236967) internal successors, (489), 210 states have internal predecessors, (489), 0 states have call successors, (0), 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 277 [2022-12-14 09:06:36,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:06:36,249 INFO L225 Difference]: With dead ends: 489 [2022-12-14 09:06:36,249 INFO L226 Difference]: Without dead ends: 279 [2022-12-14 09:06:36,252 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1037 GetRequests, 617 SyntacticMatches, 137 SemanticMatches, 283 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30481 ImplicationChecksByTransitivity, 15.6s TimeCoverageRelationStatistics Valid=17275, Invalid=63665, Unknown=0, NotChecked=0, Total=80940 [2022-12-14 09:06:36,252 INFO L413 NwaCegarLoop]: 70 mSDtfsCounter, 7 mSDsluCounter, 644 mSDsCounter, 0 mSdLazyCounter, 1473 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 714 SdHoareTripleChecker+Invalid, 1473 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1473 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-12-14 09:06:36,252 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 714 Invalid, 1473 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1473 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-12-14 09:06:36,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279 states. [2022-12-14 09:06:36,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279 to 279. [2022-12-14 09:06:36,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 279 states, 278 states have (on average 1.0071942446043165) internal successors, (280), 278 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) [2022-12-14 09:06:36,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 279 states to 279 states and 280 transitions. [2022-12-14 09:06:36,359 INFO L78 Accepts]: Start accepts. Automaton has 279 states and 280 transitions. Word has length 277 [2022-12-14 09:06:36,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:06:36,359 INFO L495 AbstractCegarLoop]: Abstraction has 279 states and 280 transitions. [2022-12-14 09:06:36,359 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 211 states, 211 states have (on average 2.3175355450236967) internal successors, (489), 210 states have internal predecessors, (489), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:06:36,359 INFO L276 IsEmpty]: Start isEmpty. Operand 279 states and 280 transitions. [2022-12-14 09:06:36,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 279 [2022-12-14 09:06:36,360 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:06:36,360 INFO L195 NwaCegarLoop]: trace histogram [69, 69, 68, 68, 1, 1, 1, 1] [2022-12-14 09:06:36,365 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (137)] Ended with exit code 0 [2022-12-14 09:06:36,561 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 137 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable136 [2022-12-14 09:06:36,561 INFO L420 AbstractCegarLoop]: === Iteration 138 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:06:36,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:06:36,562 INFO L85 PathProgramCache]: Analyzing trace with hash 1153133391, now seen corresponding path program 136 times [2022-12-14 09:06:36,562 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:06:36,562 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1731553023] [2022-12-14 09:06:36,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:06:36,563 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:06:36,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:06:40,232 INFO L134 CoverageAnalysis]: Checked inductivity of 9385 backedges. 2346 proven. 7039 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:06:40,232 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:06:40,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1731553023] [2022-12-14 09:06:40,232 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1731553023] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:06:40,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [690407807] [2022-12-14 09:06:40,232 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 09:06:40,232 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:06:40,232 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:06:40,233 INFO L229 MonitoredProcess]: Starting monitored process 138 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:06:40,233 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (138)] Waiting until timeout for monitored process [2022-12-14 09:06:40,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:06:40,391 INFO L263 TraceCheckSpWp]: Trace formula consists of 1063 conjuncts, 144 conjunts are in the unsatisfiable core [2022-12-14 09:06:40,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:06:40,606 INFO L134 CoverageAnalysis]: Checked inductivity of 9385 backedges. 2415 proven. 6970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:06:40,606 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:06:42,969 INFO L134 CoverageAnalysis]: Checked inductivity of 9385 backedges. 2415 proven. 6970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:06:42,969 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [690407807] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:06:42,969 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1461889064] [2022-12-14 09:06:42,970 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 09:06:42,970 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:06:42,970 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:06:42,970 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:06:42,970 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:06:43,009 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:06:43,216 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '218382#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:06:43,216 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:06:43,216 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:06:43,216 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72, 72] total 74 [2022-12-14 09:06:43,216 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1715544975] [2022-12-14 09:06:43,216 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:06:43,217 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 75 states [2022-12-14 09:06:43,217 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:06:43,217 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2022-12-14 09:06:43,218 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2585, Invalid=3735, Unknown=0, NotChecked=0, Total=6320 [2022-12-14 09:06:43,218 INFO L87 Difference]: Start difference. First operand 279 states and 280 transitions. Second operand has 75 states, 75 states have (on average 3.76) internal successors, (282), 74 states have internal predecessors, (282), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:06:44,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:06:44,498 INFO L93 Difference]: Finished difference Result 290 states and 291 transitions. [2022-12-14 09:06:44,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 145 states. [2022-12-14 09:06:44,499 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 75 states have (on average 3.76) internal successors, (282), 74 states have internal predecessors, (282), 0 states have call successors, (0), 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 278 [2022-12-14 09:06:44,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:06:44,499 INFO L225 Difference]: With dead ends: 290 [2022-12-14 09:06:44,499 INFO L226 Difference]: Without dead ends: 288 [2022-12-14 09:06:44,500 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1043 GetRequests, 756 SyntacticMatches, 138 SemanticMatches, 149 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10770 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=7842, Invalid=14808, Unknown=0, NotChecked=0, Total=22650 [2022-12-14 09:06:44,501 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 146 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 797 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 800 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 797 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 09:06:44,501 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [146 Valid, 20 Invalid, 800 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 797 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 09:06:44,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 288 states. [2022-12-14 09:06:44,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 288 to 282. [2022-12-14 09:06:44,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 282 states, 281 states have (on average 1.00711743772242) internal successors, (283), 281 states have internal predecessors, (283), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:06:44,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 282 states to 282 states and 283 transitions. [2022-12-14 09:06:44,601 INFO L78 Accepts]: Start accepts. Automaton has 282 states and 283 transitions. Word has length 278 [2022-12-14 09:06:44,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:06:44,601 INFO L495 AbstractCegarLoop]: Abstraction has 282 states and 283 transitions. [2022-12-14 09:06:44,601 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 75 states, 75 states have (on average 3.76) internal successors, (282), 74 states have internal predecessors, (282), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:06:44,601 INFO L276 IsEmpty]: Start isEmpty. Operand 282 states and 283 transitions. [2022-12-14 09:06:44,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 282 [2022-12-14 09:06:44,602 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:06:44,602 INFO L195 NwaCegarLoop]: trace histogram [70, 69, 69, 69, 1, 1, 1, 1] [2022-12-14 09:06:44,607 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (138)] Ended with exit code 0 [2022-12-14 09:06:44,803 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 138 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable137 [2022-12-14 09:06:44,803 INFO L420 AbstractCegarLoop]: === Iteration 139 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:06:44,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:06:44,804 INFO L85 PathProgramCache]: Analyzing trace with hash 1853238154, now seen corresponding path program 137 times [2022-12-14 09:06:44,805 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:06:44,805 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [612539718] [2022-12-14 09:06:44,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:06:44,806 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:06:44,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:06:51,602 INFO L134 CoverageAnalysis]: Checked inductivity of 9591 backedges. 6971 proven. 2620 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:06:51,603 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:06:51,603 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [612539718] [2022-12-14 09:06:51,603 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [612539718] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:06:51,603 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1016632919] [2022-12-14 09:06:51,603 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 09:06:51,603 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:06:51,603 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:06:51,604 INFO L229 MonitoredProcess]: Starting monitored process 139 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:06:51,605 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (139)] Waiting until timeout for monitored process [2022-12-14 09:06:51,987 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 70 check-sat command(s) [2022-12-14 09:06:51,987 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:06:51,994 INFO L263 TraceCheckSpWp]: Trace formula consists of 1073 conjuncts, 142 conjunts are in the unsatisfiable core [2022-12-14 09:06:51,996 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:06:57,640 INFO L134 CoverageAnalysis]: Checked inductivity of 9591 backedges. 7176 proven. 2415 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:06:57,640 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:07:01,450 INFO L134 CoverageAnalysis]: Checked inductivity of 9591 backedges. 7176 proven. 2415 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:07:01,450 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1016632919] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:07:01,450 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1326122822] [2022-12-14 09:07:01,451 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 09:07:01,451 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:07:01,451 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:07:01,451 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:07:01,451 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:07:01,498 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:07:02,071 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '221416#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:07:02,071 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:07:02,071 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:07:02,072 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [141, 141, 141] total 213 [2022-12-14 09:07:02,072 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1339543271] [2022-12-14 09:07:02,072 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:07:02,072 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 214 states [2022-12-14 09:07:02,072 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:07:02,075 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 214 interpolants. [2022-12-14 09:07:02,076 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10243, Invalid=37499, Unknown=0, NotChecked=0, Total=47742 [2022-12-14 09:07:02,077 INFO L87 Difference]: Start difference. First operand 282 states and 283 transitions. Second operand has 214 states, 214 states have (on average 2.317757009345794) internal successors, (496), 213 states have internal predecessors, (496), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:07:05,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:07:05,809 INFO L93 Difference]: Finished difference Result 496 states and 498 transitions. [2022-12-14 09:07:05,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 142 states. [2022-12-14 09:07:05,810 INFO L78 Accepts]: Start accepts. Automaton has has 214 states, 214 states have (on average 2.317757009345794) internal successors, (496), 213 states have internal predecessors, (496), 0 states have call successors, (0), 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 281 [2022-12-14 09:07:05,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:07:05,810 INFO L225 Difference]: With dead ends: 496 [2022-12-14 09:07:05,810 INFO L226 Difference]: Without dead ends: 283 [2022-12-14 09:07:05,813 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1052 GetRequests, 626 SyntacticMatches, 139 SemanticMatches, 287 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31343 ImplicationChecksByTransitivity, 16.0s TimeCoverageRelationStatistics Valid=17770, Invalid=65462, Unknown=0, NotChecked=0, Total=83232 [2022-12-14 09:07:05,814 INFO L413 NwaCegarLoop]: 71 mSDtfsCounter, 7 mSDsluCounter, 845 mSDsCounter, 0 mSdLazyCounter, 1854 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 916 SdHoareTripleChecker+Invalid, 1854 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1854 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-12-14 09:07:05,814 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 916 Invalid, 1854 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1854 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-12-14 09:07:05,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 283 states. [2022-12-14 09:07:05,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 283 to 283. [2022-12-14 09:07:05,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 283 states, 282 states have (on average 1.0070921985815602) internal successors, (284), 282 states have internal predecessors, (284), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:07:05,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 283 states to 283 states and 284 transitions. [2022-12-14 09:07:05,921 INFO L78 Accepts]: Start accepts. Automaton has 283 states and 284 transitions. Word has length 281 [2022-12-14 09:07:05,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:07:05,921 INFO L495 AbstractCegarLoop]: Abstraction has 283 states and 284 transitions. [2022-12-14 09:07:05,921 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 214 states, 214 states have (on average 2.317757009345794) internal successors, (496), 213 states have internal predecessors, (496), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:07:05,921 INFO L276 IsEmpty]: Start isEmpty. Operand 283 states and 284 transitions. [2022-12-14 09:07:05,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 283 [2022-12-14 09:07:05,922 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:07:05,922 INFO L195 NwaCegarLoop]: trace histogram [70, 70, 69, 69, 1, 1, 1, 1] [2022-12-14 09:07:05,927 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (139)] Forceful destruction successful, exit code 0 [2022-12-14 09:07:06,122 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable138,139 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:07:06,123 INFO L420 AbstractCegarLoop]: === Iteration 140 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:07:06,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:07:06,124 INFO L85 PathProgramCache]: Analyzing trace with hash -106048763, now seen corresponding path program 138 times [2022-12-14 09:07:06,124 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:07:06,124 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [640547636] [2022-12-14 09:07:06,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:07:06,125 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:07:06,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:07:09,863 INFO L134 CoverageAnalysis]: Checked inductivity of 9661 backedges. 2415 proven. 7246 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:07:09,864 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:07:09,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [640547636] [2022-12-14 09:07:09,864 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [640547636] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:07:09,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1724711071] [2022-12-14 09:07:09,864 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 09:07:09,864 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:07:09,864 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:07:09,865 INFO L229 MonitoredProcess]: Starting monitored process 140 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:07:09,865 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (140)] Waiting until timeout for monitored process [2022-12-14 09:07:10,011 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 09:07:10,011 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:07:10,023 INFO L263 TraceCheckSpWp]: Trace formula consists of 1078 conjuncts, 146 conjunts are in the unsatisfiable core [2022-12-14 09:07:10,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:07:10,223 INFO L134 CoverageAnalysis]: Checked inductivity of 9661 backedges. 2485 proven. 7176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:07:10,223 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:07:12,601 INFO L134 CoverageAnalysis]: Checked inductivity of 9661 backedges. 2485 proven. 7176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:07:12,601 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1724711071] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:07:12,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [132934638] [2022-12-14 09:07:12,602 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 09:07:12,602 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:07:12,602 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:07:12,602 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:07:12,602 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:07:12,643 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:07:13,078 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '224663#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |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| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:07:13,078 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:07:13,078 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:07:13,078 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 73, 73] total 75 [2022-12-14 09:07:13,079 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1011489711] [2022-12-14 09:07:13,079 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:07:13,079 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 76 states [2022-12-14 09:07:13,079 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:07:13,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2022-12-14 09:07:13,080 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2657, Invalid=3823, Unknown=0, NotChecked=0, Total=6480 [2022-12-14 09:07:13,080 INFO L87 Difference]: Start difference. First operand 283 states and 284 transitions. Second operand has 76 states, 76 states have (on average 3.763157894736842) internal successors, (286), 75 states have internal predecessors, (286), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:07:14,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:07:14,679 INFO L93 Difference]: Finished difference Result 294 states and 295 transitions. [2022-12-14 09:07:14,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 147 states. [2022-12-14 09:07:14,680 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 76 states have (on average 3.763157894736842) internal successors, (286), 75 states have internal predecessors, (286), 0 states have call successors, (0), 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 282 [2022-12-14 09:07:14,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:07:14,680 INFO L225 Difference]: With dead ends: 294 [2022-12-14 09:07:14,680 INFO L226 Difference]: Without dead ends: 292 [2022-12-14 09:07:14,682 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1058 GetRequests, 767 SyntacticMatches, 140 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11066 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=8060, Invalid=15196, Unknown=0, NotChecked=0, Total=23256 [2022-12-14 09:07:14,682 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 150 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 824 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 150 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 827 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 824 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 09:07:14,682 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [150 Valid, 22 Invalid, 827 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 824 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 09:07:14,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 292 states. [2022-12-14 09:07:14,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 292 to 286. [2022-12-14 09:07:14,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 286 states, 285 states have (on average 1.0070175438596491) internal successors, (287), 285 states have internal predecessors, (287), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:07:14,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 287 transitions. [2022-12-14 09:07:14,785 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 287 transitions. Word has length 282 [2022-12-14 09:07:14,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:07:14,785 INFO L495 AbstractCegarLoop]: Abstraction has 286 states and 287 transitions. [2022-12-14 09:07:14,785 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 76 states, 76 states have (on average 3.763157894736842) internal successors, (286), 75 states have internal predecessors, (286), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:07:14,785 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 287 transitions. [2022-12-14 09:07:14,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 286 [2022-12-14 09:07:14,786 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:07:14,786 INFO L195 NwaCegarLoop]: trace histogram [71, 70, 70, 70, 1, 1, 1, 1] [2022-12-14 09:07:14,791 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (140)] Forceful destruction successful, exit code 0 [2022-12-14 09:07:14,986 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 140 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable139 [2022-12-14 09:07:14,987 INFO L420 AbstractCegarLoop]: === Iteration 141 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:07:14,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:07:14,988 INFO L85 PathProgramCache]: Analyzing trace with hash 1802051604, now seen corresponding path program 139 times [2022-12-14 09:07:14,988 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:07:14,988 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [139805175] [2022-12-14 09:07:14,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:07:14,989 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:07:15,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:07:21,453 INFO L134 CoverageAnalysis]: Checked inductivity of 9870 backedges. 7177 proven. 2693 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:07:21,453 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:07:21,453 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [139805175] [2022-12-14 09:07:21,454 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [139805175] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:07:21,454 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2051644740] [2022-12-14 09:07:21,454 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 09:07:21,454 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:07:21,454 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:07:21,454 INFO L229 MonitoredProcess]: Starting monitored process 141 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:07:21,455 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_716a8c4d-abdb-4887-b9fb-e769aa638897/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (141)] Waiting until timeout for monitored process [2022-12-14 09:07:21,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:07:21,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 1088 conjuncts, 144 conjunts are in the unsatisfiable core [2022-12-14 09:07:21,578 INFO L286 TraceCheckSpWp]: Computing forward predicates...