./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-crafted/zero_sum_m2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 4e7fbc69 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_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-crafted/zero_sum_m2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW --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 64e2b591ee375a99f019d69fefe326e9fd46db25f76a67e4f3bee333adbec68f --- 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-4e7fbc6 [2022-11-23 14:54:48,092 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-23 14:54:48,095 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-23 14:54:48,137 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-23 14:54:48,138 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-23 14:54:48,139 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-23 14:54:48,140 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-23 14:54:48,142 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-23 14:54:48,144 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-23 14:54:48,149 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-23 14:54:48,150 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-23 14:54:48,154 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-23 14:54:48,155 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-23 14:54:48,160 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-23 14:54:48,163 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-23 14:54:48,165 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-23 14:54:48,166 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-23 14:54:48,169 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-23 14:54:48,170 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-23 14:54:48,178 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-23 14:54:48,180 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-23 14:54:48,183 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-23 14:54:48,185 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-23 14:54:48,186 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-23 14:54:48,192 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-23 14:54:48,192 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-23 14:54:48,193 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-23 14:54:48,193 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-23 14:54:48,194 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-23 14:54:48,195 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-23 14:54:48,195 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-23 14:54:48,196 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-23 14:54:48,196 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-23 14:54:48,197 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-23 14:54:48,198 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-23 14:54:48,203 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-23 14:54:48,204 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-23 14:54:48,204 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-23 14:54:48,205 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-23 14:54:48,209 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-23 14:54:48,209 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-23 14:54:48,210 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-23 14:54:48,254 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-23 14:54:48,254 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-23 14:54:48,255 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-23 14:54:48,255 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-23 14:54:48,256 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-23 14:54:48,256 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-23 14:54:48,256 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-23 14:54:48,256 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-23 14:54:48,256 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-23 14:54:48,257 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-23 14:54:48,258 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-23 14:54:48,258 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-23 14:54:48,258 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-23 14:54:48,258 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-23 14:54:48,258 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-23 14:54:48,259 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-23 14:54:48,259 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-23 14:54:48,259 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-23 14:54:48,260 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-23 14:54:48,260 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-23 14:54:48,260 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-23 14:54:48,260 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-23 14:54:48,260 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-23 14:54:48,261 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-23 14:54:48,261 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-23 14:54:48,261 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-23 14:54:48,262 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-23 14:54:48,262 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-23 14:54:48,262 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-23 14:54:48,262 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-23 14:54:48,263 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-23 14:54:48,263 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-23 14:54:48,263 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 14:54:48,263 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-23 14:54:48,263 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-23 14:54:48,264 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-23 14:54:48,264 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-23 14:54:48,264 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-23 14:54:48,264 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-23 14:54:48,264 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-23 14:54:48,264 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-23 14:54:48,265 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_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 64e2b591ee375a99f019d69fefe326e9fd46db25f76a67e4f3bee333adbec68f [2022-11-23 14:54:48,523 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-23 14:54:48,557 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-23 14:54:48,559 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-23 14:54:48,560 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-23 14:54:48,561 INFO L275 PluginConnector]: CDTParser initialized [2022-11-23 14:54:48,562 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/../../sv-benchmarks/c/array-crafted/zero_sum_m2.c [2022-11-23 14:54:51,609 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-23 14:54:51,863 INFO L351 CDTParser]: Found 1 translation units. [2022-11-23 14:54:51,864 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/sv-benchmarks/c/array-crafted/zero_sum_m2.c [2022-11-23 14:54:51,870 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/data/b368baf0e/6f984955cfbe4828b5b22b9dcc27afef/FLAG1cef2275c [2022-11-23 14:54:51,891 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/data/b368baf0e/6f984955cfbe4828b5b22b9dcc27afef [2022-11-23 14:54:51,896 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-23 14:54:51,898 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-23 14:54:51,901 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-23 14:54:51,901 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-23 14:54:51,905 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-23 14:54:51,905 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:54:51" (1/1) ... [2022-11-23 14:54:51,907 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@380885b6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:54:51, skipping insertion in model container [2022-11-23 14:54:51,907 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:54:51" (1/1) ... [2022-11-23 14:54:51,915 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-23 14:54:51,932 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-23 14:54:52,122 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_ee47c759-b48c-4bed-9ade-592d5cde32ee/sv-benchmarks/c/array-crafted/zero_sum_m2.c[402,415] [2022-11-23 14:54:52,149 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 14:54:52,162 INFO L203 MainTranslator]: Completed pre-run [2022-11-23 14:54:52,180 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_ee47c759-b48c-4bed-9ade-592d5cde32ee/sv-benchmarks/c/array-crafted/zero_sum_m2.c[402,415] [2022-11-23 14:54:52,192 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 14:54:52,206 INFO L208 MainTranslator]: Completed translation [2022-11-23 14:54:52,206 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:54:52 WrapperNode [2022-11-23 14:54:52,206 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-23 14:54:52,208 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-23 14:54:52,208 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-23 14:54:52,208 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-23 14:54:52,216 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:54:52" (1/1) ... [2022-11-23 14:54:52,223 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:54:52" (1/1) ... [2022-11-23 14:54:52,239 INFO L138 Inliner]: procedures = 15, calls = 15, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 83 [2022-11-23 14:54:52,239 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-23 14:54:52,240 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-23 14:54:52,240 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-23 14:54:52,241 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-23 14:54:52,250 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:54:52" (1/1) ... [2022-11-23 14:54:52,250 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:54:52" (1/1) ... [2022-11-23 14:54:52,252 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:54:52" (1/1) ... [2022-11-23 14:54:52,252 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:54:52" (1/1) ... [2022-11-23 14:54:52,257 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:54:52" (1/1) ... [2022-11-23 14:54:52,262 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:54:52" (1/1) ... [2022-11-23 14:54:52,263 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:54:52" (1/1) ... [2022-11-23 14:54:52,264 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:54:52" (1/1) ... [2022-11-23 14:54:52,266 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-23 14:54:52,267 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-23 14:54:52,267 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-23 14:54:52,268 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-23 14:54:52,268 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:54:52" (1/1) ... [2022-11-23 14:54:52,275 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 14:54:52,288 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:54:52,302 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-23 14:54:52,323 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-23 14:54:52,350 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-23 14:54:52,350 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-23 14:54:52,350 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-23 14:54:52,351 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-23 14:54:52,351 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-23 14:54:52,351 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-23 14:54:52,351 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-11-23 14:54:52,351 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-23 14:54:52,417 INFO L235 CfgBuilder]: Building ICFG [2022-11-23 14:54:52,419 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-23 14:54:52,584 INFO L276 CfgBuilder]: Performing block encoding [2022-11-23 14:54:52,651 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-23 14:54:52,651 INFO L300 CfgBuilder]: Removed 5 assume(true) statements. [2022-11-23 14:54:52,654 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:54:52 BoogieIcfgContainer [2022-11-23 14:54:52,655 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-23 14:54:52,657 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-23 14:54:52,658 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-23 14:54:52,661 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-23 14:54:52,662 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:54:51" (1/3) ... [2022-11-23 14:54:52,662 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@19e02f1c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:54:52, skipping insertion in model container [2022-11-23 14:54:52,663 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:54:52" (2/3) ... [2022-11-23 14:54:52,663 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@19e02f1c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:54:52, skipping insertion in model container [2022-11-23 14:54:52,663 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:54:52" (3/3) ... [2022-11-23 14:54:52,665 INFO L112 eAbstractionObserver]: Analyzing ICFG zero_sum_m2.c [2022-11-23 14:54:52,700 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-23 14:54:52,700 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-23 14:54:52,745 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-23 14:54:52,751 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;@7a8e11f8, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-23 14:54:52,752 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-23 14:54:52,755 INFO L276 IsEmpty]: Start isEmpty. Operand has 13 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 12 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:54:52,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-23 14:54:52,762 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:54:52,763 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:54:52,763 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:54:52,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:54:52,769 INFO L85 PathProgramCache]: Analyzing trace with hash 871733126, now seen corresponding path program 1 times [2022-11-23 14:54:52,777 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:54:52,777 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1756149909] [2022-11-23 14:54:52,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:54:52,778 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:54:52,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:54:53,014 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:54:53,015 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:54:53,015 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1756149909] [2022-11-23 14:54:53,016 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1756149909] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:54:53,016 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:54:53,017 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-23 14:54:53,022 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1266740368] [2022-11-23 14:54:53,023 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:54:53,028 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 14:54:53,029 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:54:53,069 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 14:54:53,070 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 14:54:53,073 INFO L87 Difference]: Start difference. First operand has 13 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 12 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:54:53,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:54:53,168 INFO L93 Difference]: Finished difference Result 24 states and 35 transitions. [2022-11-23 14:54:53,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 14:54:53,171 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-23 14:54:53,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:54:53,179 INFO L225 Difference]: With dead ends: 24 [2022-11-23 14:54:53,180 INFO L226 Difference]: Without dead ends: 11 [2022-11-23 14:54:53,182 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 14:54:53,186 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:54:53,187 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:54:53,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2022-11-23 14:54:53,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2022-11-23 14:54:53,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:54:53,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 15 transitions. [2022-11-23 14:54:53,220 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 15 transitions. Word has length 9 [2022-11-23 14:54:53,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:54:53,221 INFO L495 AbstractCegarLoop]: Abstraction has 11 states and 15 transitions. [2022-11-23 14:54:53,221 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:54:53,222 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 15 transitions. [2022-11-23 14:54:53,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-23 14:54:53,222 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:54:53,222 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:54:53,223 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-23 14:54:53,223 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:54:53,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:54:53,224 INFO L85 PathProgramCache]: Analyzing trace with hash 280227729, now seen corresponding path program 1 times [2022-11-23 14:54:53,224 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:54:53,225 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1678358370] [2022-11-23 14:54:53,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:54:53,225 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:54:53,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:54:53,397 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 14:54:53,397 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:54:53,398 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1678358370] [2022-11-23 14:54:53,398 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1678358370] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:54:53,398 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:54:53,399 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-23 14:54:53,399 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1981061422] [2022-11-23 14:54:53,399 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:54:53,400 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-23 14:54:53,405 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:54:53,409 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-23 14:54:53,410 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-23 14:54:53,411 INFO L87 Difference]: Start difference. First operand 11 states and 15 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:54:53,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:54:53,469 INFO L93 Difference]: Finished difference Result 21 states and 31 transitions. [2022-11-23 14:54:53,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-23 14:54:53,470 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-11-23 14:54:53,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:54:53,471 INFO L225 Difference]: With dead ends: 21 [2022-11-23 14:54:53,471 INFO L226 Difference]: Without dead ends: 15 [2022-11-23 14:54:53,472 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-23 14:54:53,473 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 12 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:54:53,474 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 5 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 14:54:53,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-11-23 14:54:53,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2022-11-23 14:54:53,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 14 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:54:53,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 19 transitions. [2022-11-23 14:54:53,480 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 19 transitions. Word has length 10 [2022-11-23 14:54:53,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:54:53,480 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 19 transitions. [2022-11-23 14:54:53,480 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:54:53,481 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 19 transitions. [2022-11-23 14:54:53,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-23 14:54:53,481 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:54:53,482 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:54:53,482 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-23 14:54:53,482 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:54:53,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:54:53,483 INFO L85 PathProgramCache]: Analyzing trace with hash 2106682685, now seen corresponding path program 1 times [2022-11-23 14:54:53,483 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:54:53,484 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2068986064] [2022-11-23 14:54:53,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:54:53,484 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:54:53,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:54:53,668 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-23 14:54:53,668 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:54:53,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2068986064] [2022-11-23 14:54:53,669 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2068986064] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:54:53,670 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2083489225] [2022-11-23 14:54:53,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:54:53,670 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:54:53,670 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:54:53,674 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:54:53,685 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-23 14:54:53,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:54:53,757 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-23 14:54:53,762 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:54:53,827 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-23 14:54:53,827 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:54:53,853 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-23 14:54:53,853 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2083489225] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:54:53,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1388732266] [2022-11-23 14:54:53,874 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 14:54:53,875 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:54:53,878 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:54:53,884 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:54:53,884 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:54:53,960 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:54,002 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 14:54:54,003 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 14:54:54,023 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:54,025 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-23 14:54:54,071 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:54,073 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-23 14:54:54,247 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:54,251 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:54,267 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 14:54:54,268 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-11-23 14:54:54,352 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 14:54:54,522 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:54:54,735 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '220#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:54:54,735 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:54:54,736 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:54:54,736 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2022-11-23 14:54:54,736 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [953871202] [2022-11-23 14:54:54,736 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:54:54,737 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-23 14:54:54,737 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:54:54,738 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-23 14:54:54,738 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2022-11-23 14:54:54,738 INFO L87 Difference]: Start difference. First operand 15 states and 19 transitions. Second operand has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 7 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:54:54,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:54:54,779 INFO L93 Difference]: Finished difference Result 27 states and 35 transitions. [2022-11-23 14:54:54,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-23 14:54:54,780 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 7 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-11-23 14:54:54,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:54:54,780 INFO L225 Difference]: With dead ends: 27 [2022-11-23 14:54:54,780 INFO L226 Difference]: Without dead ends: 16 [2022-11-23 14:54:54,781 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2022-11-23 14:54:54,782 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:54:54,783 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 7 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 14:54:54,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-11-23 14:54:54,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2022-11-23 14:54:54,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 15 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:54:54,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2022-11-23 14:54:54,787 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 14 [2022-11-23 14:54:54,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:54:54,788 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2022-11-23 14:54:54,788 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 7 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:54:54,788 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2022-11-23 14:54:54,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-23 14:54:54,789 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:54:54,789 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:54:54,795 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-23 14:54:54,995 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:54:54,995 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:54:54,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:54:54,997 INFO L85 PathProgramCache]: Analyzing trace with hash 617571346, now seen corresponding path program 2 times [2022-11-23 14:54:54,997 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:54:54,998 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1430868709] [2022-11-23 14:54:55,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:54:55,003 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:54:55,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:54:55,152 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-23 14:54:55,153 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:54:55,153 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1430868709] [2022-11-23 14:54:55,153 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1430868709] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:54:55,154 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1429910098] [2022-11-23 14:54:55,154 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:54:55,154 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:54:55,154 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:54:55,155 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:54:55,181 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-23 14:54:55,245 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-23 14:54:55,246 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:54:55,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-23 14:54:55,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:54:55,283 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-23 14:54:55,283 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:54:55,308 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-23 14:54:55,309 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1429910098] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:54:55,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1100159852] [2022-11-23 14:54:55,311 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 14:54:55,311 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:54:55,312 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:54:55,312 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:54:55,312 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:54:55,334 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:55,365 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 14:54:55,366 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 14:54:55,379 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:55,381 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-23 14:54:55,410 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:55,412 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-23 14:54:55,483 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:55,484 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:54:55,513 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 14:54:55,514 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-11-23 14:54:55,618 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 14:54:55,810 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:54:56,146 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '390#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:54:56,147 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:54:56,147 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:54:56,147 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2022-11-23 14:54:56,147 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [971098738] [2022-11-23 14:54:56,147 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:54:56,148 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-23 14:54:56,148 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:54:56,148 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-23 14:54:56,149 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2022-11-23 14:54:56,149 INFO L87 Difference]: Start difference. First operand 16 states and 20 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:54:56,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:54:56,216 INFO L93 Difference]: Finished difference Result 29 states and 39 transitions. [2022-11-23 14:54:56,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-23 14:54:56,216 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2022-11-23 14:54:56,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:54:56,217 INFO L225 Difference]: With dead ends: 29 [2022-11-23 14:54:56,217 INFO L226 Difference]: Without dead ends: 20 [2022-11-23 14:54:56,218 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 30 SyntacticMatches, 7 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2022-11-23 14:54:56,219 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 12 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:54:56,219 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 7 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:54:56,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-11-23 14:54:56,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2022-11-23 14:54:56,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.263157894736842) internal successors, (24), 19 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:54:56,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2022-11-23 14:54:56,224 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 15 [2022-11-23 14:54:56,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:54:56,225 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2022-11-23 14:54:56,225 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:54:56,225 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2022-11-23 14:54:56,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-23 14:54:56,226 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:54:56,226 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:54:56,241 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-23 14:54:56,432 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:54:56,433 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:54:56,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:54:56,433 INFO L85 PathProgramCache]: Analyzing trace with hash 956916582, now seen corresponding path program 3 times [2022-11-23 14:54:56,433 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:54:56,434 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1106199604] [2022-11-23 14:54:56,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:54:56,434 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:54:56,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:54:57,965 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:54:57,965 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:54:57,965 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1106199604] [2022-11-23 14:54:57,966 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1106199604] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:54:57,966 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [240004907] [2022-11-23 14:54:57,966 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 14:54:57,966 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:54:57,966 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:54:57,967 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:54:57,997 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-23 14:54:58,052 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 14:54:58,052 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:54:58,054 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 48 conjunts are in the unsatisfiable core [2022-11-23 14:54:58,059 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:54:58,098 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-23 14:54:58,546 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:54:58,546 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:54:59,078 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-23 14:54:59,078 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [240004907] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:54:59,078 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [71004464] [2022-11-23 14:54:59,080 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 14:54:59,081 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:54:59,081 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:54:59,081 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:54:59,081 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:54:59,105 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:59,138 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-23 14:54:59,139 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-23 14:54:59,155 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:59,192 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 14:54:59,193 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 14:54:59,222 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:59,224 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-23 14:54:59,295 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:59,296 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:54:59,327 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 14:54:59,329 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-11-23 14:54:59,437 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 14:54:59,568 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:55:00,241 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '615#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:55:00,241 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:55:00,241 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:55:00,241 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 14] total 27 [2022-11-23 14:55:00,242 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1430182818] [2022-11-23 14:55:00,242 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:55:00,242 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-11-23 14:55:00,242 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:55:00,243 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-11-23 14:55:00,243 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=904, Unknown=0, NotChecked=0, Total=992 [2022-11-23 14:55:00,243 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand has 27 states, 27 states have (on average 1.2962962962962963) internal successors, (35), 27 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:55:00,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:55:00,593 INFO L93 Difference]: Finished difference Result 33 states and 40 transitions. [2022-11-23 14:55:00,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-23 14:55:00,594 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.2962962962962963) internal successors, (35), 27 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2022-11-23 14:55:00,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:55:00,595 INFO L225 Difference]: With dead ends: 33 [2022-11-23 14:55:00,595 INFO L226 Difference]: Without dead ends: 30 [2022-11-23 14:55:00,596 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 23 SyntacticMatches, 20 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 383 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=94, Invalid=962, Unknown=0, NotChecked=0, Total=1056 [2022-11-23 14:55:00,596 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 10 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 374 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 378 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 374 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 14:55:00,597 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 37 Invalid, 378 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 374 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 14:55:00,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-11-23 14:55:00,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 28. [2022-11-23 14:55:00,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.2962962962962963) internal successors, (35), 27 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:55:00,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 35 transitions. [2022-11-23 14:55:00,604 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 35 transitions. Word has length 19 [2022-11-23 14:55:00,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:55:00,605 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 35 transitions. [2022-11-23 14:55:00,605 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.2962962962962963) internal successors, (35), 27 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:55:00,606 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 35 transitions. [2022-11-23 14:55:00,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-23 14:55:00,606 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:55:00,607 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:55:00,618 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-23 14:55:00,812 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:55:00,813 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:55:00,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:55:00,813 INFO L85 PathProgramCache]: Analyzing trace with hash -489495424, now seen corresponding path program 4 times [2022-11-23 14:55:00,813 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:55:00,814 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [545164901] [2022-11-23 14:55:00,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:55:00,814 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:55:00,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:55:00,931 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-23 14:55:00,931 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:55:00,933 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [545164901] [2022-11-23 14:55:00,933 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [545164901] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:55:00,933 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [541833210] [2022-11-23 14:55:00,934 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 14:55:00,934 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:55:00,934 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:55:00,935 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:55:00,958 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-23 14:55:01,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:55:01,006 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-23 14:55:01,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:55:01,063 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-23 14:55:01,063 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:55:01,114 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-23 14:55:01,115 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [541833210] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:55:01,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1130209636] [2022-11-23 14:55:01,118 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 14:55:01,118 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:55:01,119 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:55:01,119 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:55:01,119 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:55:01,146 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:01,176 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 14:55:01,177 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 14:55:01,193 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:01,195 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-23 14:55:01,218 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:01,220 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-23 14:55:01,278 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:01,279 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:55:01,304 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 14:55:01,305 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-11-23 14:55:01,407 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 14:55:01,553 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:55:01,943 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '858#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:55:01,943 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:55:01,943 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:55:01,944 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 13 [2022-11-23 14:55:01,944 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [423692523] [2022-11-23 14:55:01,944 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:55:01,944 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-23 14:55:01,944 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:55:01,945 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-23 14:55:01,945 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=244, Unknown=0, NotChecked=0, Total=306 [2022-11-23 14:55:01,945 INFO L87 Difference]: Start difference. First operand 28 states and 35 transitions. Second operand has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:55:02,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:55:02,095 INFO L93 Difference]: Finished difference Result 54 states and 68 transitions. [2022-11-23 14:55:02,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-23 14:55:02,097 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2022-11-23 14:55:02,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:55:02,097 INFO L225 Difference]: With dead ends: 54 [2022-11-23 14:55:02,097 INFO L226 Difference]: Without dead ends: 29 [2022-11-23 14:55:02,098 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 39 SyntacticMatches, 11 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 181 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=85, Invalid=335, Unknown=0, NotChecked=0, Total=420 [2022-11-23 14:55:02,099 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 14 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 98 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 122 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 98 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:55:02,099 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 13 Invalid, 122 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 98 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:55:02,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-11-23 14:55:02,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2022-11-23 14:55:02,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 28 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) [2022-11-23 14:55:02,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 36 transitions. [2022-11-23 14:55:02,112 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 36 transitions. Word has length 20 [2022-11-23 14:55:02,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:55:02,112 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 36 transitions. [2022-11-23 14:55:02,113 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:55:02,113 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 36 transitions. [2022-11-23 14:55:02,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-23 14:55:02,115 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:55:02,116 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:55:02,127 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-11-23 14:55:02,322 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-23 14:55:02,323 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:55:02,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:55:02,323 INFO L85 PathProgramCache]: Analyzing trace with hash -1462786155, now seen corresponding path program 5 times [2022-11-23 14:55:02,323 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:55:02,323 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1573610194] [2022-11-23 14:55:02,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:55:02,324 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:55:02,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:55:02,427 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-23 14:55:02,427 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:55:02,428 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1573610194] [2022-11-23 14:55:02,428 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1573610194] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:55:02,428 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [689909298] [2022-11-23 14:55:02,428 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:55:02,428 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:55:02,428 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:55:02,429 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:55:02,453 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-23 14:55:02,514 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-23 14:55:02,514 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:55:02,515 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-23 14:55:02,517 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:55:02,602 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-23 14:55:02,602 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:55:02,685 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-23 14:55:02,686 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [689909298] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:55:02,686 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [103942156] [2022-11-23 14:55:02,688 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 14:55:02,688 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:55:02,688 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:55:02,688 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:55:02,689 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:55:02,705 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:02,732 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-23 14:55:02,732 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-23 14:55:02,746 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:02,787 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 14:55:02,787 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 14:55:02,819 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:02,820 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-23 14:55:02,875 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:02,877 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:55:02,902 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 14:55:02,903 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-11-23 14:55:03,015 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 14:55:03,147 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:55:03,522 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1156#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:55:03,523 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:55:03,523 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:55:03,523 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2022-11-23 14:55:03,523 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2058401665] [2022-11-23 14:55:03,523 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:55:03,524 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-23 14:55:03,524 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:55:03,524 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-23 14:55:03,525 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=271, Unknown=0, NotChecked=0, Total=342 [2022-11-23 14:55:03,525 INFO L87 Difference]: Start difference. First operand 29 states and 36 transitions. Second operand has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:55:03,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:55:03,650 INFO L93 Difference]: Finished difference Result 42 states and 54 transitions. [2022-11-23 14:55:03,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-23 14:55:03,651 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2022-11-23 14:55:03,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:55:03,651 INFO L225 Difference]: With dead ends: 42 [2022-11-23 14:55:03,651 INFO L226 Difference]: Without dead ends: 25 [2022-11-23 14:55:03,652 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 41 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=114, Invalid=392, Unknown=0, NotChecked=0, Total=506 [2022-11-23 14:55:03,653 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 54 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:55:03,653 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [54 Valid, 7 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:55:03,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-11-23 14:55:03,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-11-23 14:55:03,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 24 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:55:03,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2022-11-23 14:55:03,659 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 21 [2022-11-23 14:55:03,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:55:03,660 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2022-11-23 14:55:03,660 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:55:03,660 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2022-11-23 14:55:03,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-23 14:55:03,661 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:55:03,661 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:55:03,673 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-23 14:55:03,861 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-11-23 14:55:03,862 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:55:03,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:55:03,862 INFO L85 PathProgramCache]: Analyzing trace with hash 844534749, now seen corresponding path program 6 times [2022-11-23 14:55:03,863 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:55:03,863 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [138212730] [2022-11-23 14:55:03,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:55:03,863 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:55:03,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:55:05,755 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:55:05,755 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:55:05,755 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [138212730] [2022-11-23 14:55:05,755 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [138212730] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:55:05,755 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [624487745] [2022-11-23 14:55:05,755 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 14:55:05,755 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:55:05,756 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:55:05,756 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:55:05,761 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-23 14:55:05,838 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 14:55:05,838 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:55:05,840 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 66 conjunts are in the unsatisfiable core [2022-11-23 14:55:05,842 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:55:05,880 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-23 14:55:06,722 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:55:06,722 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:55:07,704 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-23 14:55:07,704 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [624487745] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:55:07,705 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [783046838] [2022-11-23 14:55:07,707 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 14:55:07,707 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:55:07,708 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:55:07,708 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:55:07,708 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:55:07,729 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:07,753 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-23 14:55:07,754 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-23 14:55:07,767 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:07,795 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 14:55:07,796 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 14:55:07,832 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:07,834 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-23 14:55:07,904 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:07,906 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:55:07,933 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 14:55:07,934 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-11-23 14:55:08,022 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 14:55:08,142 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:55:08,631 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1477#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:55:08,631 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:55:08,631 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:55:08,631 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 21, 18] total 49 [2022-11-23 14:55:08,631 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1532171583] [2022-11-23 14:55:08,631 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:55:08,632 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-11-23 14:55:08,632 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:55:08,632 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-11-23 14:55:08,633 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=2686, Unknown=0, NotChecked=0, Total=2862 [2022-11-23 14:55:08,634 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand has 49 states, 49 states have (on average 1.2244897959183674) internal successors, (60), 49 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) [2022-11-23 14:55:10,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:55:10,092 INFO L93 Difference]: Finished difference Result 41 states and 48 transitions. [2022-11-23 14:55:10,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-23 14:55:10,092 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.2244897959183674) internal successors, (60), 49 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) Word has length 24 [2022-11-23 14:55:10,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:55:10,093 INFO L225 Difference]: With dead ends: 41 [2022-11-23 14:55:10,093 INFO L226 Difference]: Without dead ends: 38 [2022-11-23 14:55:10,095 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 33 SyntacticMatches, 8 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1202 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=251, Invalid=3655, Unknown=0, NotChecked=0, Total=3906 [2022-11-23 14:55:10,096 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 787 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 811 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 787 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-23 14:55:10,096 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 61 Invalid, 811 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 787 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-23 14:55:10,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-11-23 14:55:10,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 35. [2022-11-23 14:55:10,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.2352941176470589) internal successors, (42), 34 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:55:10,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 42 transitions. [2022-11-23 14:55:10,105 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 42 transitions. Word has length 24 [2022-11-23 14:55:10,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:55:10,105 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 42 transitions. [2022-11-23 14:55:10,105 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.2244897959183674) internal successors, (60), 49 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) [2022-11-23 14:55:10,105 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 42 transitions. [2022-11-23 14:55:10,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-11-23 14:55:10,106 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:55:10,106 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:55:10,113 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-11-23 14:55:10,312 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:55:10,313 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:55:10,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:55:10,313 INFO L85 PathProgramCache]: Analyzing trace with hash 247414721, now seen corresponding path program 7 times [2022-11-23 14:55:10,313 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:55:10,313 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2071553984] [2022-11-23 14:55:10,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:55:10,314 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:55:10,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:55:10,447 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-23 14:55:10,448 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:55:10,448 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2071553984] [2022-11-23 14:55:10,448 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2071553984] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:55:10,448 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1015469904] [2022-11-23 14:55:10,448 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 14:55:10,449 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:55:10,449 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:55:10,450 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:55:10,473 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-23 14:55:10,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:55:10,526 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-23 14:55:10,527 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:55:10,606 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-23 14:55:10,606 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:55:10,670 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-23 14:55:10,670 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1015469904] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:55:10,670 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1276858886] [2022-11-23 14:55:10,672 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 14:55:10,672 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:55:10,672 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:55:10,672 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:55:10,673 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:55:10,697 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:10,728 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 14:55:10,728 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 14:55:10,739 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:10,740 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-23 14:55:10,762 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:10,764 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-23 14:55:10,825 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:10,827 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:10,840 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 14:55:10,841 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-11-23 14:55:10,891 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 14:55:11,005 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:55:11,436 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1799#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:55:11,436 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:55:11,437 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:55:11,437 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 16 [2022-11-23 14:55:11,437 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1034466075] [2022-11-23 14:55:11,437 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:55:11,438 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-23 14:55:11,438 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:55:11,438 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-23 14:55:11,439 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=336, Unknown=0, NotChecked=0, Total=420 [2022-11-23 14:55:11,439 INFO L87 Difference]: Start difference. First operand 35 states and 42 transitions. Second operand has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:55:11,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:55:11,600 INFO L93 Difference]: Finished difference Result 68 states and 82 transitions. [2022-11-23 14:55:11,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-23 14:55:11,601 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2022-11-23 14:55:11,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:55:11,604 INFO L225 Difference]: With dead ends: 68 [2022-11-23 14:55:11,604 INFO L226 Difference]: Without dead ends: 36 [2022-11-23 14:55:11,605 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 49 SyntacticMatches, 15 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 293 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=120, Invalid=480, Unknown=0, NotChecked=0, Total=600 [2022-11-23 14:55:11,607 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 18 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 146 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:55:11,608 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 13 Invalid, 146 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:55:11,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-11-23 14:55:11,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2022-11-23 14:55:11,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 35 states have (on average 1.2285714285714286) internal successors, (43), 35 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:55:11,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 43 transitions. [2022-11-23 14:55:11,617 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 43 transitions. Word has length 25 [2022-11-23 14:55:11,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:55:11,617 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 43 transitions. [2022-11-23 14:55:11,617 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:55:11,618 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 43 transitions. [2022-11-23 14:55:11,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-23 14:55:11,618 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:55:11,618 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:55:11,623 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-23 14:55:11,821 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:55:11,821 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:55:11,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:55:11,822 INFO L85 PathProgramCache]: Analyzing trace with hash -1961221684, now seen corresponding path program 8 times [2022-11-23 14:55:11,822 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:55:11,822 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1356320577] [2022-11-23 14:55:11,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:55:11,822 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:55:11,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:55:11,966 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-23 14:55:11,967 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:55:11,967 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1356320577] [2022-11-23 14:55:11,967 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1356320577] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:55:11,967 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [581448811] [2022-11-23 14:55:11,967 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:55:11,967 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:55:11,967 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:55:11,970 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:55:12,001 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-23 14:55:12,058 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-23 14:55:12,058 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:55:12,060 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-23 14:55:12,061 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:55:12,157 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-23 14:55:12,158 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:55:12,252 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-23 14:55:12,253 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [581448811] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:55:12,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [954404469] [2022-11-23 14:55:12,254 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 14:55:12,255 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:55:12,255 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:55:12,255 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:55:12,255 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:55:12,280 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:12,308 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-23 14:55:12,312 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-23 14:55:12,327 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:12,356 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 14:55:12,356 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 14:55:12,378 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:12,379 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-23 14:55:12,432 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:12,434 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:12,446 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 14:55:12,447 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-11-23 14:55:12,488 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 14:55:12,588 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:55:12,924 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2174#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:55:12,924 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:55:12,924 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:55:12,924 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2022-11-23 14:55:12,924 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [354415251] [2022-11-23 14:55:12,924 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:55:12,925 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-23 14:55:12,925 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:55:12,925 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-23 14:55:12,926 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462 [2022-11-23 14:55:12,926 INFO L87 Difference]: Start difference. First operand 36 states and 43 transitions. Second operand has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:55:13,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:55:13,091 INFO L93 Difference]: Finished difference Result 51 states and 63 transitions. [2022-11-23 14:55:13,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-23 14:55:13,097 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2022-11-23 14:55:13,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:55:13,102 INFO L225 Difference]: With dead ends: 51 [2022-11-23 14:55:13,102 INFO L226 Difference]: Without dead ends: 30 [2022-11-23 14:55:13,103 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 55 SyntacticMatches, 12 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 314 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=159, Invalid=543, Unknown=0, NotChecked=0, Total=702 [2022-11-23 14:55:13,104 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 37 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 111 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 140 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 111 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:55:13,104 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 15 Invalid, 140 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 111 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:55:13,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-11-23 14:55:13,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2022-11-23 14:55:13,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.1724137931034482) internal successors, (34), 29 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:55:13,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2022-11-23 14:55:13,111 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 26 [2022-11-23 14:55:13,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:55:13,112 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2022-11-23 14:55:13,112 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:55:13,112 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2022-11-23 14:55:13,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-23 14:55:13,113 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:55:13,113 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:55:13,126 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-23 14:55:13,318 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-23 14:55:13,319 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:55:13,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:55:13,319 INFO L85 PathProgramCache]: Analyzing trace with hash 919934790, now seen corresponding path program 9 times [2022-11-23 14:55:13,319 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:55:13,319 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [465834410] [2022-11-23 14:55:13,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:55:13,320 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:55:13,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:55:16,088 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:55:16,088 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:55:16,088 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [465834410] [2022-11-23 14:55:16,088 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [465834410] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:55:16,089 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [516666525] [2022-11-23 14:55:16,089 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 14:55:16,089 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:55:16,089 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:55:16,090 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:55:16,094 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-23 14:55:16,189 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 14:55:16,189 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:55:16,192 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 86 conjunts are in the unsatisfiable core [2022-11-23 14:55:16,195 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:55:16,275 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-23 14:55:17,550 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:55:17,550 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:55:19,306 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-23 14:55:19,307 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [516666525] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:55:19,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [987944407] [2022-11-23 14:55:19,308 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 14:55:19,308 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:55:19,309 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:55:19,309 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:55:19,309 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:55:19,323 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:19,347 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-23 14:55:19,347 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-23 14:55:19,358 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:19,385 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 14:55:19,386 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 14:55:19,419 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:19,420 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-23 14:55:19,470 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:19,471 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:55:19,494 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 14:55:19,495 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-11-23 14:55:19,585 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 14:55:19,696 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:55:21,049 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2569#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:55:21,049 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:55:21,049 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:55:21,049 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 26, 22] total 63 [2022-11-23 14:55:21,050 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [258292126] [2022-11-23 14:55:21,050 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:55:21,050 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2022-11-23 14:55:21,050 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:55:21,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2022-11-23 14:55:21,052 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=223, Invalid=4333, Unknown=0, NotChecked=0, Total=4556 [2022-11-23 14:55:21,052 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand has 63 states, 63 states have (on average 1.1746031746031746) internal successors, (74), 63 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:55:23,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:55:23,683 INFO L93 Difference]: Finished difference Result 49 states and 56 transitions. [2022-11-23 14:55:23,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-23 14:55:23,689 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 1.1746031746031746) internal successors, (74), 63 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 29 [2022-11-23 14:55:23,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:55:23,690 INFO L225 Difference]: With dead ends: 49 [2022-11-23 14:55:23,690 INFO L226 Difference]: Without dead ends: 46 [2022-11-23 14:55:23,692 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 29 SyntacticMatches, 18 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2415 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=365, Invalid=6441, Unknown=0, NotChecked=0, Total=6806 [2022-11-23 14:55:23,693 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 16 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 1282 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 1319 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 1282 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:55:23,696 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 81 Invalid, 1319 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 1282 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-11-23 14:55:23,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2022-11-23 14:55:23,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 42. [2022-11-23 14:55:23,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 41 states have (on average 1.1951219512195121) internal successors, (49), 41 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:55:23,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 49 transitions. [2022-11-23 14:55:23,711 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 49 transitions. Word has length 29 [2022-11-23 14:55:23,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:55:23,712 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 49 transitions. [2022-11-23 14:55:23,712 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 1.1746031746031746) internal successors, (74), 63 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:55:23,712 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 49 transitions. [2022-11-23 14:55:23,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-23 14:55:23,713 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:55:23,713 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:55:23,718 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-23 14:55:23,917 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-23 14:55:23,917 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:55:23,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:55:23,918 INFO L85 PathProgramCache]: Analyzing trace with hash -234145888, now seen corresponding path program 10 times [2022-11-23 14:55:23,918 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:55:23,918 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2073452747] [2022-11-23 14:55:23,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:55:23,918 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:55:23,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:55:24,099 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-11-23 14:55:24,099 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:55:24,100 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2073452747] [2022-11-23 14:55:24,100 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2073452747] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:55:24,100 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [563032750] [2022-11-23 14:55:24,100 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 14:55:24,100 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:55:24,100 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:55:24,106 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:55:24,135 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-23 14:55:24,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:55:24,190 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-23 14:55:24,192 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:55:24,294 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-11-23 14:55:24,295 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:55:24,401 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-11-23 14:55:24,401 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [563032750] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:55:24,401 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [231458577] [2022-11-23 14:55:24,404 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 14:55:24,405 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:55:24,405 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:55:24,405 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:55:24,406 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:55:24,422 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:24,452 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 14:55:24,454 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 14:55:24,464 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:24,465 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-23 14:55:24,491 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:24,492 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-23 14:55:24,539 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:24,542 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:24,555 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 14:55:24,555 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-11-23 14:55:24,603 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 14:55:24,702 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:55:25,054 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2966#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:55:25,054 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:55:25,055 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:55:25,055 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 19 [2022-11-23 14:55:25,055 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1288984285] [2022-11-23 14:55:25,055 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:55:25,056 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-23 14:55:25,056 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:55:25,056 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-23 14:55:25,056 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=442, Unknown=0, NotChecked=0, Total=552 [2022-11-23 14:55:25,057 INFO L87 Difference]: Start difference. First operand 42 states and 49 transitions. Second operand has 19 states, 19 states have (on average 1.631578947368421) internal successors, (31), 19 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) [2022-11-23 14:55:25,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:55:25,272 INFO L93 Difference]: Finished difference Result 82 states and 96 transitions. [2022-11-23 14:55:25,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-23 14:55:25,273 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.631578947368421) internal successors, (31), 19 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2022-11-23 14:55:25,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:55:25,273 INFO L225 Difference]: With dead ends: 82 [2022-11-23 14:55:25,274 INFO L226 Difference]: Without dead ends: 43 [2022-11-23 14:55:25,274 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 64 SyntacticMatches, 14 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 349 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=162, Invalid=650, Unknown=0, NotChecked=0, Total=812 [2022-11-23 14:55:25,275 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 18 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 154 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 215 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 154 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:55:25,275 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 7 Invalid, 215 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 154 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:55:25,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-11-23 14:55:25,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2022-11-23 14:55:25,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 42 states have (on average 1.1904761904761905) internal successors, (50), 42 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) [2022-11-23 14:55:25,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 50 transitions. [2022-11-23 14:55:25,287 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 50 transitions. Word has length 30 [2022-11-23 14:55:25,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:55:25,287 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 50 transitions. [2022-11-23 14:55:25,287 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.631578947368421) internal successors, (31), 19 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) [2022-11-23 14:55:25,288 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 50 transitions. [2022-11-23 14:55:25,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-11-23 14:55:25,288 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:55:25,289 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:55:25,301 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-23 14:55:25,494 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:55:25,494 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:55:25,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:55:25,495 INFO L85 PathProgramCache]: Analyzing trace with hash -671947659, now seen corresponding path program 11 times [2022-11-23 14:55:25,495 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:55:25,495 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1204925977] [2022-11-23 14:55:25,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:55:25,495 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:55:25,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:55:25,691 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2022-11-23 14:55:25,692 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:55:25,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1204925977] [2022-11-23 14:55:25,692 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1204925977] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:55:25,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1571527326] [2022-11-23 14:55:25,692 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:55:25,693 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:55:25,693 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:55:25,694 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:55:25,730 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-23 14:55:25,811 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-23 14:55:25,811 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:55:25,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-23 14:55:25,814 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:55:25,931 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2022-11-23 14:55:25,931 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:55:26,051 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2022-11-23 14:55:26,051 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1571527326] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:55:26,051 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [71519887] [2022-11-23 14:55:26,054 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 14:55:26,055 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:55:26,055 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:55:26,055 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:55:26,055 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:55:26,073 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:26,097 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-23 14:55:26,098 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-23 14:55:26,111 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:26,139 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 14:55:26,140 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 14:55:26,164 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:26,165 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-23 14:55:26,220 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:26,221 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:55:26,246 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 14:55:26,247 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-11-23 14:55:26,329 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 14:55:26,428 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:55:26,791 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3418#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:55:26,791 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:55:26,791 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:55:26,791 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2022-11-23 14:55:26,792 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1033815738] [2022-11-23 14:55:26,792 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:55:26,792 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-23 14:55:26,792 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:55:26,793 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-23 14:55:26,793 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=481, Unknown=0, NotChecked=0, Total=600 [2022-11-23 14:55:26,793 INFO L87 Difference]: Start difference. First operand 43 states and 50 transitions. Second operand has 20 states, 20 states have (on average 1.85) internal successors, (37), 20 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:55:26,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:55:26,950 INFO L93 Difference]: Finished difference Result 60 states and 72 transitions. [2022-11-23 14:55:26,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-23 14:55:26,951 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.85) internal successors, (37), 20 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2022-11-23 14:55:26,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:55:26,951 INFO L225 Difference]: With dead ends: 60 [2022-11-23 14:55:26,952 INFO L226 Difference]: Without dead ends: 35 [2022-11-23 14:55:26,952 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 66 SyntacticMatches, 15 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 458 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=213, Invalid=717, Unknown=0, NotChecked=0, Total=930 [2022-11-23 14:55:26,952 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 42 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 101 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 134 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:55:26,953 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 11 Invalid, 134 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 101 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:55:26,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-11-23 14:55:26,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2022-11-23 14:55:26,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.1470588235294117) internal successors, (39), 34 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:55:26,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2022-11-23 14:55:26,962 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 31 [2022-11-23 14:55:26,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:55:26,962 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2022-11-23 14:55:26,962 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.85) internal successors, (37), 20 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:55:26,962 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2022-11-23 14:55:26,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-11-23 14:55:26,963 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:55:26,963 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:55:26,973 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-23 14:55:27,169 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-23 14:55:27,170 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:55:27,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:55:27,170 INFO L85 PathProgramCache]: Analyzing trace with hash 1768952445, now seen corresponding path program 12 times [2022-11-23 14:55:27,170 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:55:27,171 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [793880522] [2022-11-23 14:55:27,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:55:27,171 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:55:27,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:55:31,138 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 1 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:55:31,139 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:55:31,139 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [793880522] [2022-11-23 14:55:31,139 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [793880522] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:55:31,139 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [536520324] [2022-11-23 14:55:31,139 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 14:55:31,139 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:55:31,139 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:55:31,140 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:55:31,142 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-23 14:55:31,225 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 14:55:31,225 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:55:31,228 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 102 conjunts are in the unsatisfiable core [2022-11-23 14:55:31,234 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:55:31,360 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-23 14:55:33,099 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:55:33,099 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:55:35,863 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-23 14:55:35,863 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [536520324] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:55:35,863 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1828600457] [2022-11-23 14:55:35,864 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 14:55:35,865 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:55:35,865 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:55:35,865 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:55:35,865 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:55:35,880 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:35,915 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 14:55:35,916 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 14:55:35,927 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:35,930 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-23 14:55:35,953 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:35,953 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-23 14:55:35,991 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:35,992 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:55:36,015 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 14:55:36,016 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-11-23 14:55:36,104 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 14:55:36,216 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:55:38,077 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3883#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:55:38,077 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:55:38,077 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:55:38,077 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 31, 26] total 73 [2022-11-23 14:55:38,077 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1856361861] [2022-11-23 14:55:38,077 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:55:38,078 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2022-11-23 14:55:38,078 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:55:38,078 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2022-11-23 14:55:38,079 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=252, Invalid=5754, Unknown=0, NotChecked=0, Total=6006 [2022-11-23 14:55:38,079 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand has 73 states, 73 states have (on average 1.1506849315068493) internal successors, (84), 73 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) [2022-11-23 14:55:41,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:55:41,999 INFO L93 Difference]: Finished difference Result 57 states and 64 transitions. [2022-11-23 14:55:42,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-11-23 14:55:42,000 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 1.1506849315068493) internal successors, (84), 73 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) Word has length 34 [2022-11-23 14:55:42,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:55:42,001 INFO L225 Difference]: With dead ends: 57 [2022-11-23 14:55:42,001 INFO L226 Difference]: Without dead ends: 54 [2022-11-23 14:55:42,003 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 34 SyntacticMatches, 23 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3004 ImplicationChecksByTransitivity, 9.4s TimeCoverageRelationStatistics Valid=439, Invalid=8681, Unknown=0, NotChecked=0, Total=9120 [2022-11-23 14:55:42,005 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 19 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 1673 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 1724 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 1673 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-11-23 14:55:42,007 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 93 Invalid, 1724 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 1673 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-11-23 14:55:42,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-11-23 14:55:42,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 49. [2022-11-23 14:55:42,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.1666666666666667) internal successors, (56), 48 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:55:42,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 56 transitions. [2022-11-23 14:55:42,025 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 56 transitions. Word has length 34 [2022-11-23 14:55:42,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:55:42,026 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 56 transitions. [2022-11-23 14:55:42,026 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 1.1506849315068493) internal successors, (84), 73 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) [2022-11-23 14:55:42,026 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 56 transitions. [2022-11-23 14:55:42,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-11-23 14:55:42,026 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:55:42,027 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:55:42,032 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-23 14:55:42,229 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:55:42,229 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:55:42,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:55:42,230 INFO L85 PathProgramCache]: Analyzing trace with hash 875301153, now seen corresponding path program 13 times [2022-11-23 14:55:42,230 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:55:42,230 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1256141603] [2022-11-23 14:55:42,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:55:42,230 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:55:42,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:55:42,437 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-23 14:55:42,437 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:55:42,437 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1256141603] [2022-11-23 14:55:42,437 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1256141603] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:55:42,437 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1691005581] [2022-11-23 14:55:42,437 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 14:55:42,438 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:55:42,438 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:55:42,439 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:55:42,445 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-23 14:55:42,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:55:42,532 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-23 14:55:42,533 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:55:42,687 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-23 14:55:42,687 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:55:42,793 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-23 14:55:42,794 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1691005581] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:55:42,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1661019899] [2022-11-23 14:55:42,795 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 14:55:42,795 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:55:42,795 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:55:42,796 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:55:42,796 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:55:42,811 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:42,838 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-23 14:55:42,838 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-23 14:55:42,850 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:42,878 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 14:55:42,878 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 14:55:42,902 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:42,903 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-23 14:55:42,951 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:42,954 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:55:42,982 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 14:55:42,983 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-11-23 14:55:43,058 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 14:55:43,159 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:55:43,842 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4349#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:55:43,842 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:55:43,842 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:55:43,842 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 22 [2022-11-23 14:55:43,842 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1082303910] [2022-11-23 14:55:43,842 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:55:43,843 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-23 14:55:43,843 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:55:43,843 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-23 14:55:43,844 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=562, Unknown=0, NotChecked=0, Total=702 [2022-11-23 14:55:43,844 INFO L87 Difference]: Start difference. First operand 49 states and 56 transitions. Second operand has 22 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 22 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:55:44,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:55:44,087 INFO L93 Difference]: Finished difference Result 96 states and 110 transitions. [2022-11-23 14:55:44,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-23 14:55:44,087 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 22 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2022-11-23 14:55:44,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:55:44,088 INFO L225 Difference]: With dead ends: 96 [2022-11-23 14:55:44,088 INFO L226 Difference]: Without dead ends: 50 [2022-11-23 14:55:44,090 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 63 SyntacticMatches, 29 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 703 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=211, Invalid=845, Unknown=0, NotChecked=0, Total=1056 [2022-11-23 14:55:44,091 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 16 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 203 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 240 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 203 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:55:44,092 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 15 Invalid, 240 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 203 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:55:44,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-11-23 14:55:44,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2022-11-23 14:55:44,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.163265306122449) internal successors, (57), 49 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:55:44,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 57 transitions. [2022-11-23 14:55:44,124 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 57 transitions. Word has length 35 [2022-11-23 14:55:44,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:55:44,125 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 57 transitions. [2022-11-23 14:55:44,125 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 22 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:55:44,125 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 57 transitions. [2022-11-23 14:55:44,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-11-23 14:55:44,126 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:55:44,126 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:55:44,138 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-23 14:55:44,332 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:55:44,333 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:55:44,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:55:44,333 INFO L85 PathProgramCache]: Analyzing trace with hash -743958164, now seen corresponding path program 14 times [2022-11-23 14:55:44,333 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:55:44,333 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1764404786] [2022-11-23 14:55:44,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:55:44,334 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:55:44,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:55:44,574 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2022-11-23 14:55:44,575 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:55:44,575 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1764404786] [2022-11-23 14:55:44,575 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1764404786] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:55:44,575 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1663882039] [2022-11-23 14:55:44,575 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:55:44,575 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:55:44,575 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:55:44,577 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:55:44,596 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-23 14:55:44,710 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-23 14:55:44,710 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:55:44,712 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-23 14:55:44,713 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:55:44,860 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2022-11-23 14:55:44,861 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:55:44,986 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2022-11-23 14:55:44,987 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1663882039] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:55:44,987 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1854927637] [2022-11-23 14:55:44,988 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 14:55:44,988 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:55:44,988 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:55:44,989 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:55:44,989 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:55:45,004 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:45,029 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-23 14:55:45,030 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-23 14:55:45,042 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:45,071 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 14:55:45,071 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 14:55:45,092 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:45,093 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-23 14:55:45,144 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:45,145 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:55:45,171 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 14:55:45,171 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-11-23 14:55:45,252 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 14:55:45,357 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:55:45,889 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4878#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:55:45,889 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:55:45,889 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:55:45,889 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2022-11-23 14:55:45,889 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1886890323] [2022-11-23 14:55:45,889 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:55:45,889 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-11-23 14:55:45,890 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:55:45,890 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-11-23 14:55:45,890 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=607, Unknown=0, NotChecked=0, Total=756 [2022-11-23 14:55:45,890 INFO L87 Difference]: Start difference. First operand 50 states and 57 transitions. Second operand has 23 states, 23 states have (on average 1.4782608695652173) internal successors, (34), 23 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:55:46,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:55:46,112 INFO L93 Difference]: Finished difference Result 69 states and 81 transitions. [2022-11-23 14:55:46,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-23 14:55:46,113 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.4782608695652173) internal successors, (34), 23 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2022-11-23 14:55:46,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:55:46,113 INFO L225 Difference]: With dead ends: 69 [2022-11-23 14:55:46,113 INFO L226 Difference]: Without dead ends: 40 [2022-11-23 14:55:46,114 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 71 SyntacticMatches, 24 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 777 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=276, Invalid=914, Unknown=0, NotChecked=0, Total=1190 [2022-11-23 14:55:46,115 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 160 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 160 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 171 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:55:46,115 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [160 Valid, 11 Invalid, 171 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 112 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:55:46,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-11-23 14:55:46,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2022-11-23 14:55:46,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.1282051282051282) internal successors, (44), 39 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:55:46,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 44 transitions. [2022-11-23 14:55:46,126 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 44 transitions. Word has length 36 [2022-11-23 14:55:46,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:55:46,126 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 44 transitions. [2022-11-23 14:55:46,126 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.4782608695652173) internal successors, (34), 23 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:55:46,127 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 44 transitions. [2022-11-23 14:55:46,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-11-23 14:55:46,127 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:55:46,127 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:55:46,139 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-23 14:55:46,339 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-23 14:55:46,340 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:55:46,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:55:46,340 INFO L85 PathProgramCache]: Analyzing trace with hash -1584221402, now seen corresponding path program 15 times [2022-11-23 14:55:46,340 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:55:46,340 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1820744350] [2022-11-23 14:55:46,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:55:46,340 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:55:46,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:55:52,092 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:55:52,092 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:55:52,092 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1820744350] [2022-11-23 14:55:52,092 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1820744350] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:55:52,092 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1566891104] [2022-11-23 14:55:52,092 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 14:55:52,092 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:55:52,093 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:55:52,093 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:55:52,096 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-23 14:55:52,212 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 14:55:52,212 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:55:52,215 WARN L261 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 122 conjunts are in the unsatisfiable core [2022-11-23 14:55:52,219 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:55:52,325 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-23 14:55:54,759 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:55:54,760 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:55:58,877 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-23 14:55:58,878 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1566891104] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:55:58,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1321308900] [2022-11-23 14:55:58,879 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 14:55:58,879 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:55:58,880 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:55:58,880 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:55:58,880 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:55:58,894 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:58,919 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-23 14:55:58,919 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-23 14:55:58,932 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:58,957 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 14:55:58,958 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 14:55:58,979 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:58,980 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-23 14:55:59,030 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:55:59,031 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:55:59,058 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 14:55:59,058 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-11-23 14:55:59,133 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 14:55:59,226 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:56:00,965 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5414#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:56:00,965 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:56:00,965 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:56:00,965 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 36, 30] total 84 [2022-11-23 14:56:00,965 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [899162370] [2022-11-23 14:56:00,966 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:56:00,966 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 84 states [2022-11-23 14:56:00,966 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:56:00,967 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2022-11-23 14:56:00,969 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=287, Invalid=7545, Unknown=0, NotChecked=0, Total=7832 [2022-11-23 14:56:00,970 INFO L87 Difference]: Start difference. First operand 40 states and 44 transitions. Second operand has 84 states, 84 states have (on average 1.130952380952381) internal successors, (95), 84 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) [2022-11-23 14:56:06,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:56:06,656 INFO L93 Difference]: Finished difference Result 65 states and 72 transitions. [2022-11-23 14:56:06,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-11-23 14:56:06,656 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 84 states have (on average 1.130952380952381) internal successors, (95), 84 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) Word has length 39 [2022-11-23 14:56:06,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:56:06,657 INFO L225 Difference]: With dead ends: 65 [2022-11-23 14:56:06,657 INFO L226 Difference]: Without dead ends: 62 [2022-11-23 14:56:06,660 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 46 SyntacticMatches, 20 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3259 ImplicationChecksByTransitivity, 12.9s TimeCoverageRelationStatistics Valid=520, Invalid=11470, Unknown=0, NotChecked=0, Total=11990 [2022-11-23 14:56:06,661 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 17 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 2081 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 2148 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 2081 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:56:06,661 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 101 Invalid, 2148 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 2081 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2022-11-23 14:56:06,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-11-23 14:56:06,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 56. [2022-11-23 14:56:06,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 1.1454545454545455) internal successors, (63), 55 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:56:06,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 63 transitions. [2022-11-23 14:56:06,679 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 63 transitions. Word has length 39 [2022-11-23 14:56:06,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:56:06,680 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 63 transitions. [2022-11-23 14:56:06,680 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 84 states, 84 states have (on average 1.130952380952381) internal successors, (95), 84 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) [2022-11-23 14:56:06,680 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 63 transitions. [2022-11-23 14:56:06,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-11-23 14:56:06,681 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:56:06,681 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:56:06,693 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-23 14:56:06,889 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-23 14:56:06,889 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:56:06,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:56:06,890 INFO L85 PathProgramCache]: Analyzing trace with hash 722707136, now seen corresponding path program 16 times [2022-11-23 14:56:06,890 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:56:06,890 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1264500929] [2022-11-23 14:56:06,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:56:06,890 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:56:06,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:56:07,156 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 22 proven. 27 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2022-11-23 14:56:07,157 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:56:07,157 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1264500929] [2022-11-23 14:56:07,157 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1264500929] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:56:07,157 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [81382909] [2022-11-23 14:56:07,157 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 14:56:07,157 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:56:07,157 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:56:07,158 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:56:07,169 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-23 14:56:07,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:56:07,266 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-23 14:56:07,268 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:56:07,431 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2022-11-23 14:56:07,432 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:56:07,573 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2022-11-23 14:56:07,573 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [81382909] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:56:07,574 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1146535387] [2022-11-23 14:56:07,575 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 14:56:07,575 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:56:07,575 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:56:07,576 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:56:07,576 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:56:07,594 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:07,621 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-23 14:56:07,621 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-23 14:56:07,634 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:07,660 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 14:56:07,660 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 14:56:07,680 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:07,681 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-23 14:56:07,734 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:07,735 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:56:07,758 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 14:56:07,758 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-11-23 14:56:07,835 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 14:56:07,943 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:56:08,655 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5949#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:56:08,656 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:56:08,656 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:56:08,656 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 25 [2022-11-23 14:56:08,656 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1076004662] [2022-11-23 14:56:08,656 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:56:08,657 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-23 14:56:08,657 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:56:08,657 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-23 14:56:08,657 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=696, Unknown=0, NotChecked=0, Total=870 [2022-11-23 14:56:08,658 INFO L87 Difference]: Start difference. First operand 56 states and 63 transitions. Second operand has 25 states, 25 states have (on average 1.48) internal successors, (37), 25 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:56:08,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:56:08,939 INFO L93 Difference]: Finished difference Result 110 states and 124 transitions. [2022-11-23 14:56:08,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-23 14:56:08,940 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.48) internal successors, (37), 25 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2022-11-23 14:56:08,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:56:08,940 INFO L225 Difference]: With dead ends: 110 [2022-11-23 14:56:08,940 INFO L226 Difference]: Without dead ends: 57 [2022-11-23 14:56:08,941 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 79 SyntacticMatches, 27 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 773 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=267, Invalid=1065, Unknown=0, NotChecked=0, Total=1332 [2022-11-23 14:56:08,941 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 18 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 218 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 270 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 218 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:56:08,942 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 11 Invalid, 270 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 218 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:56:08,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2022-11-23 14:56:08,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2022-11-23 14:56:08,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 56 states have (on average 1.1428571428571428) internal successors, (64), 56 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:56:08,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 64 transitions. [2022-11-23 14:56:08,960 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 64 transitions. Word has length 40 [2022-11-23 14:56:08,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:56:08,960 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 64 transitions. [2022-11-23 14:56:08,961 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.48) internal successors, (37), 25 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:56:08,961 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 64 transitions. [2022-11-23 14:56:08,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-11-23 14:56:08,961 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:56:08,961 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:56:08,974 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-23 14:56:09,167 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:56:09,168 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:56:09,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:56:09,168 INFO L85 PathProgramCache]: Analyzing trace with hash -1499657899, now seen corresponding path program 17 times [2022-11-23 14:56:09,168 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:56:09,168 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1273822077] [2022-11-23 14:56:09,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:56:09,169 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:56:09,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:56:09,428 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 15 proven. 34 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2022-11-23 14:56:09,429 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:56:09,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1273822077] [2022-11-23 14:56:09,429 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1273822077] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:56:09,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1226856277] [2022-11-23 14:56:09,429 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:56:09,429 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:56:09,429 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:56:09,431 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:56:09,470 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-23 14:56:09,577 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-23 14:56:09,577 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:56:09,579 INFO L263 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-23 14:56:09,581 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:56:09,739 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2022-11-23 14:56:09,739 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:56:09,890 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2022-11-23 14:56:09,890 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1226856277] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:56:09,890 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2035699157] [2022-11-23 14:56:09,892 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 14:56:09,892 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:56:09,892 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:56:09,893 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:56:09,893 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:56:09,912 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:09,942 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-23 14:56:09,943 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-23 14:56:09,953 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:09,982 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 14:56:09,983 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 14:56:10,006 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:10,007 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-23 14:56:10,054 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:10,057 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:10,070 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 14:56:10,071 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-11-23 14:56:10,111 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 14:56:10,210 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:56:10,783 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6555#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:56:10,783 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:56:10,783 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:56:10,783 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2022-11-23 14:56:10,783 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1753851242] [2022-11-23 14:56:10,783 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:56:10,784 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-23 14:56:10,784 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:56:10,785 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-23 14:56:10,785 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=747, Unknown=0, NotChecked=0, Total=930 [2022-11-23 14:56:10,785 INFO L87 Difference]: Start difference. First operand 57 states and 64 transitions. Second operand has 26 states, 26 states have (on average 1.8076923076923077) internal successors, (47), 26 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:56:11,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:56:11,001 INFO L93 Difference]: Finished difference Result 78 states and 90 transitions. [2022-11-23 14:56:11,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-23 14:56:11,002 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.8076923076923077) internal successors, (47), 26 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2022-11-23 14:56:11,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:56:11,002 INFO L225 Difference]: With dead ends: 78 [2022-11-23 14:56:11,003 INFO L226 Difference]: Without dead ends: 45 [2022-11-23 14:56:11,003 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 81 SyntacticMatches, 28 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1024 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=348, Invalid=1134, Unknown=0, NotChecked=0, Total=1482 [2022-11-23 14:56:11,004 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 89 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 148 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 199 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 148 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:56:11,004 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [89 Valid, 13 Invalid, 199 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 148 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:56:11,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-11-23 14:56:11,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2022-11-23 14:56:11,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.1136363636363635) internal successors, (49), 44 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:56:11,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2022-11-23 14:56:11,016 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 41 [2022-11-23 14:56:11,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:56:11,016 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2022-11-23 14:56:11,017 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.8076923076923077) internal successors, (47), 26 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:56:11,017 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2022-11-23 14:56:11,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-11-23 14:56:11,017 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:56:11,017 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:56:11,023 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-23 14:56:11,223 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:56:11,223 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:56:11,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:56:11,224 INFO L85 PathProgramCache]: Analyzing trace with hash -1455167203, now seen corresponding path program 18 times [2022-11-23 14:56:11,224 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:56:11,224 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [56291702] [2022-11-23 14:56:11,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:56:11,224 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:56:11,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:56:18,382 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 0 proven. 140 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:56:18,383 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:56:18,383 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [56291702] [2022-11-23 14:56:18,383 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [56291702] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:56:18,383 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [165419523] [2022-11-23 14:56:18,383 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 14:56:18,383 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:56:18,383 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:56:18,384 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:56:18,387 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-23 14:56:18,488 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 14:56:18,488 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:56:18,491 WARN L261 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 138 conjunts are in the unsatisfiable core [2022-11-23 14:56:18,494 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:56:18,569 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-23 14:56:20,950 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 0 proven. 140 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:56:20,950 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:56:25,964 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 0 proven. 112 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-23 14:56:25,964 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [165419523] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:56:25,964 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [373058000] [2022-11-23 14:56:25,966 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 14:56:25,966 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:56:25,966 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:56:25,966 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:56:25,967 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:56:25,985 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:26,010 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 14:56:26,011 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 14:56:26,022 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:26,023 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-23 14:56:26,045 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:26,046 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-23 14:56:26,102 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:26,104 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:26,117 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 14:56:26,118 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-11-23 14:56:26,161 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 14:56:26,269 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:56:30,065 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7156#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:56:30,065 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:56:30,065 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:56:30,065 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 41, 34] total 89 [2022-11-23 14:56:30,065 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1003649108] [2022-11-23 14:56:30,065 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:56:30,066 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 89 states [2022-11-23 14:56:30,066 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:56:30,066 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2022-11-23 14:56:30,067 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=341, Invalid=8401, Unknown=0, NotChecked=0, Total=8742 [2022-11-23 14:56:30,067 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand has 89 states, 89 states have (on average 1.101123595505618) internal successors, (98), 89 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:56:36,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:56:36,854 INFO L93 Difference]: Finished difference Result 73 states and 80 transitions. [2022-11-23 14:56:36,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-11-23 14:56:36,861 INFO L78 Accepts]: Start accepts. Automaton has has 89 states, 89 states have (on average 1.101123595505618) internal successors, (98), 89 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 44 [2022-11-23 14:56:36,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:56:36,862 INFO L225 Difference]: With dead ends: 73 [2022-11-23 14:56:36,862 INFO L226 Difference]: Without dead ends: 70 [2022-11-23 14:56:36,864 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 39 SyntacticMatches, 42 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4857 ImplicationChecksByTransitivity, 16.3s TimeCoverageRelationStatistics Valid=615, Invalid=12957, Unknown=0, NotChecked=0, Total=13572 [2022-11-23 14:56:36,867 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 18 mSDsluCounter, 116 mSDsCounter, 0 mSdLazyCounter, 2768 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 2832 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 2768 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2022-11-23 14:56:36,867 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 119 Invalid, 2832 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 2768 Invalid, 0 Unknown, 0 Unchecked, 2.9s Time] [2022-11-23 14:56:36,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2022-11-23 14:56:36,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 63. [2022-11-23 14:56:36,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 62 states have (on average 1.1290322580645162) internal successors, (70), 62 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:56:36,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 70 transitions. [2022-11-23 14:56:36,897 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 70 transitions. Word has length 44 [2022-11-23 14:56:36,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:56:36,897 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 70 transitions. [2022-11-23 14:56:36,898 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 89 states, 89 states have (on average 1.101123595505618) internal successors, (98), 89 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:56:36,898 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 70 transitions. [2022-11-23 14:56:36,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-11-23 14:56:36,899 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:56:36,899 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:56:36,910 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-23 14:56:37,105 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:56:37,105 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:56:37,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:56:37,106 INFO L85 PathProgramCache]: Analyzing trace with hash -1118766463, now seen corresponding path program 19 times [2022-11-23 14:56:37,106 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:56:37,106 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1821071829] [2022-11-23 14:56:37,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:56:37,106 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:56:37,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:56:37,380 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 29 proven. 35 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2022-11-23 14:56:37,380 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:56:37,380 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1821071829] [2022-11-23 14:56:37,380 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1821071829] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:56:37,380 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [619209222] [2022-11-23 14:56:37,380 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 14:56:37,381 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:56:37,381 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:56:37,382 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:56:37,406 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-23 14:56:37,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:56:37,499 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-23 14:56:37,501 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:56:37,687 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2022-11-23 14:56:37,687 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:56:37,843 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2022-11-23 14:56:37,843 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [619209222] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:56:37,843 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1786945473] [2022-11-23 14:56:37,844 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 14:56:37,845 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:56:37,845 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:56:37,845 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:56:37,845 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:56:37,859 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:37,887 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 14:56:37,888 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 14:56:37,896 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:37,897 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-23 14:56:37,916 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:37,917 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-23 14:56:37,980 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:37,983 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:37,996 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 14:56:37,997 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-11-23 14:56:38,052 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 14:56:38,134 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:56:38,964 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7758#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:56:38,965 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:56:38,965 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:56:38,965 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 28 [2022-11-23 14:56:38,965 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1663209705] [2022-11-23 14:56:38,965 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:56:38,965 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-23 14:56:38,966 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:56:38,966 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-23 14:56:38,966 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=844, Unknown=0, NotChecked=0, Total=1056 [2022-11-23 14:56:38,966 INFO L87 Difference]: Start difference. First operand 63 states and 70 transitions. Second operand has 28 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 28 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:56:39,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:56:39,270 INFO L93 Difference]: Finished difference Result 124 states and 138 transitions. [2022-11-23 14:56:39,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-23 14:56:39,270 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 28 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 45 [2022-11-23 14:56:39,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:56:39,271 INFO L225 Difference]: With dead ends: 124 [2022-11-23 14:56:39,271 INFO L226 Difference]: Without dead ends: 64 [2022-11-23 14:56:39,272 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 81 SyntacticMatches, 39 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1181 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=330, Invalid=1310, Unknown=0, NotChecked=0, Total=1640 [2022-11-23 14:56:39,272 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 16 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 306 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 348 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 306 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 14:56:39,272 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 19 Invalid, 348 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 306 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 14:56:39,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2022-11-23 14:56:39,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2022-11-23 14:56:39,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 63 states have (on average 1.126984126984127) internal successors, (71), 63 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:56:39,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 71 transitions. [2022-11-23 14:56:39,288 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 71 transitions. Word has length 45 [2022-11-23 14:56:39,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:56:39,288 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 71 transitions. [2022-11-23 14:56:39,288 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 28 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:56:39,288 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 71 transitions. [2022-11-23 14:56:39,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-11-23 14:56:39,288 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:56:39,289 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:56:39,293 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-23 14:56:39,489 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:56:39,489 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:56:39,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:56:39,489 INFO L85 PathProgramCache]: Analyzing trace with hash 469330188, now seen corresponding path program 20 times [2022-11-23 14:56:39,490 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:56:39,490 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1485601186] [2022-11-23 14:56:39,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:56:39,490 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:56:39,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:56:39,780 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 21 proven. 43 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2022-11-23 14:56:39,781 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:56:39,781 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1485601186] [2022-11-23 14:56:39,781 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1485601186] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:56:39,781 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1168037659] [2022-11-23 14:56:39,781 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:56:39,781 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:56:39,781 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:56:39,783 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:56:39,809 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-23 14:56:39,955 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-23 14:56:39,955 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:56:39,957 INFO L263 TraceCheckSpWp]: Trace formula consists of 281 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-23 14:56:39,959 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:56:40,149 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2022-11-23 14:56:40,149 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:56:40,338 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2022-11-23 14:56:40,338 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1168037659] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:56:40,338 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1588918003] [2022-11-23 14:56:40,339 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 14:56:40,340 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:56:40,340 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:56:40,340 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:56:40,340 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:56:40,356 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:40,403 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 14:56:40,403 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 14:56:40,413 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:40,414 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-23 14:56:40,435 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:40,438 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-23 14:56:40,487 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:40,489 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:40,502 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 14:56:40,502 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-11-23 14:56:40,543 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 14:56:40,636 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:56:41,216 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8441#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:56:41,216 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:56:41,216 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:56:41,216 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2022-11-23 14:56:41,216 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [362933167] [2022-11-23 14:56:41,216 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:56:41,217 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-11-23 14:56:41,217 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:56:41,217 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-11-23 14:56:41,217 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=221, Invalid=901, Unknown=0, NotChecked=0, Total=1122 [2022-11-23 14:56:41,217 INFO L87 Difference]: Start difference. First operand 64 states and 71 transitions. Second operand has 29 states, 29 states have (on average 1.3793103448275863) internal successors, (40), 29 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:56:41,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:56:41,477 INFO L93 Difference]: Finished difference Result 87 states and 99 transitions. [2022-11-23 14:56:41,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-23 14:56:41,477 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.3793103448275863) internal successors, (40), 29 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2022-11-23 14:56:41,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:56:41,478 INFO L225 Difference]: With dead ends: 87 [2022-11-23 14:56:41,478 INFO L226 Difference]: Without dead ends: 50 [2022-11-23 14:56:41,479 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 91 SyntacticMatches, 32 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1304 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=429, Invalid=1377, Unknown=0, NotChecked=0, Total=1806 [2022-11-23 14:56:41,479 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 104 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 127 mSolverCounterSat, 84 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 104 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 211 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 84 IncrementalHoareTripleChecker+Valid, 127 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:56:41,479 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [104 Valid, 7 Invalid, 211 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [84 Valid, 127 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:56:41,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-11-23 14:56:41,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2022-11-23 14:56:41,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.1020408163265305) internal successors, (54), 49 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:56:41,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2022-11-23 14:56:41,490 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 46 [2022-11-23 14:56:41,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:56:41,490 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2022-11-23 14:56:41,490 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.3793103448275863) internal successors, (40), 29 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:56:41,490 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2022-11-23 14:56:41,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-11-23 14:56:41,491 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:56:41,491 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:56:41,497 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-23 14:56:41,691 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-11-23 14:56:41,692 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:56:41,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:56:41,692 INFO L85 PathProgramCache]: Analyzing trace with hash 301741830, now seen corresponding path program 21 times [2022-11-23 14:56:41,692 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:56:41,692 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [431578628] [2022-11-23 14:56:41,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:56:41,692 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:56:41,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:56:50,315 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 0 proven. 180 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:56:50,315 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:56:50,315 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [431578628] [2022-11-23 14:56:50,315 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [431578628] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:56:50,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1633286222] [2022-11-23 14:56:50,316 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 14:56:50,316 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:56:50,316 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:56:50,317 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:56:50,319 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-23 14:56:50,435 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 14:56:50,436 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:56:50,440 WARN L261 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 158 conjunts are in the unsatisfiable core [2022-11-23 14:56:50,443 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:56:50,524 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-23 14:56:53,973 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 0 proven. 180 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:56:53,973 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:57:01,115 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-23 14:57:01,115 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1633286222] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:57:01,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [457323755] [2022-11-23 14:57:01,116 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 14:57:01,116 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:57:01,117 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:57:01,117 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:57:01,117 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:57:01,131 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:57:01,153 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-23 14:57:01,153 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-23 14:57:01,164 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:57:01,189 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 14:57:01,189 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 14:57:01,209 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:57:01,210 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-23 14:57:01,248 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:57:01,249 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:57:01,273 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 14:57:01,274 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-11-23 14:57:01,347 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 14:57:01,443 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:57:05,075 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9113#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:57:05,075 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:57:05,075 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:57:05,075 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 46, 38] total 100 [2022-11-23 14:57:05,077 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2084800177] [2022-11-23 14:57:05,078 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:57:05,078 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 100 states [2022-11-23 14:57:05,078 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:57:05,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2022-11-23 14:57:05,080 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=416, Invalid=10504, Unknown=0, NotChecked=0, Total=10920 [2022-11-23 14:57:05,080 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand has 100 states, 100 states have (on average 1.09) internal successors, (109), 100 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:57:13,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:57:13,354 INFO L93 Difference]: Finished difference Result 81 states and 88 transitions. [2022-11-23 14:57:13,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-11-23 14:57:13,355 INFO L78 Accepts]: Start accepts. Automaton has has 100 states, 100 states have (on average 1.09) internal successors, (109), 100 states have internal predecessors, (109), 0 states have call successors, (0), 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 [2022-11-23 14:57:13,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:57:13,355 INFO L225 Difference]: With dead ends: 81 [2022-11-23 14:57:13,356 INFO L226 Difference]: Without dead ends: 78 [2022-11-23 14:57:13,357 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 51 SyntacticMatches, 39 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5575 ImplicationChecksByTransitivity, 20.5s TimeCoverageRelationStatistics Valid=750, Invalid=16280, Unknown=0, NotChecked=0, Total=17030 [2022-11-23 14:57:13,358 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 18 mSDsluCounter, 126 mSDsCounter, 0 mSdLazyCounter, 3188 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 129 SdHoareTripleChecker+Invalid, 3246 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 3188 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2022-11-23 14:57:13,358 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 129 Invalid, 3246 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 3188 Invalid, 0 Unknown, 0 Unchecked, 3.3s Time] [2022-11-23 14:57:13,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2022-11-23 14:57:13,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 70. [2022-11-23 14:57:13,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.1159420289855073) internal successors, (77), 69 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:57:13,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 77 transitions. [2022-11-23 14:57:13,383 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 77 transitions. Word has length 49 [2022-11-23 14:57:13,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:57:13,383 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 77 transitions. [2022-11-23 14:57:13,384 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 100 states, 100 states have (on average 1.09) internal successors, (109), 100 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:57:13,384 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 77 transitions. [2022-11-23 14:57:13,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-11-23 14:57:13,384 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:57:13,384 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:57:13,391 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-23 14:57:13,591 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:57:13,591 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:57:13,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:57:13,591 INFO L85 PathProgramCache]: Analyzing trace with hash -1167448608, now seen corresponding path program 22 times [2022-11-23 14:57:13,591 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:57:13,592 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [476215995] [2022-11-23 14:57:13,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:57:13,592 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:57:13,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:57:13,900 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 37 proven. 44 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2022-11-23 14:57:13,900 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:57:13,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [476215995] [2022-11-23 14:57:13,901 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [476215995] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:57:13,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1768173697] [2022-11-23 14:57:13,901 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 14:57:13,901 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:57:13,901 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:57:13,906 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:57:13,925 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-23 14:57:14,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:57:14,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-23 14:57:14,033 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:57:14,262 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2022-11-23 14:57:14,262 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:57:14,425 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2022-11-23 14:57:14,426 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1768173697] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:57:14,426 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [746409451] [2022-11-23 14:57:14,427 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 14:57:14,427 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:57:14,427 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:57:14,427 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:57:14,427 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:57:14,445 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:57:14,470 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 14:57:14,471 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 14:57:14,480 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:57:14,481 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-23 14:57:14,497 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:57:14,497 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-23 14:57:14,537 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:57:14,537 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:57:14,559 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 14:57:14,559 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-11-23 14:57:14,628 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 14:57:14,721 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:57:15,463 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9784#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:57:15,463 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:57:15,463 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:57:15,464 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 31 [2022-11-23 14:57:15,464 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1656596788] [2022-11-23 14:57:15,464 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:57:15,464 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-11-23 14:57:15,464 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:57:15,465 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-11-23 14:57:15,465 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=254, Invalid=1006, Unknown=0, NotChecked=0, Total=1260 [2022-11-23 14:57:15,465 INFO L87 Difference]: Start difference. First operand 70 states and 77 transitions. Second operand has 31 states, 31 states have (on average 1.3870967741935485) internal successors, (43), 31 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:57:15,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:57:15,815 INFO L93 Difference]: Finished difference Result 138 states and 152 transitions. [2022-11-23 14:57:15,816 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-23 14:57:15,816 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.3870967741935485) internal successors, (43), 31 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2022-11-23 14:57:15,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:57:15,816 INFO L225 Difference]: With dead ends: 138 [2022-11-23 14:57:15,817 INFO L226 Difference]: Without dead ends: 71 [2022-11-23 14:57:15,817 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 99 SyntacticMatches, 35 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1213 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=400, Invalid=1580, Unknown=0, NotChecked=0, Total=1980 [2022-11-23 14:57:15,817 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 16 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 295 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 355 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 295 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 14:57:15,818 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 17 Invalid, 355 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 295 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 14:57:15,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-11-23 14:57:15,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2022-11-23 14:57:15,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 70 states have (on average 1.1142857142857143) internal successors, (78), 70 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) [2022-11-23 14:57:15,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 78 transitions. [2022-11-23 14:57:15,850 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 78 transitions. Word has length 50 [2022-11-23 14:57:15,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:57:15,850 INFO L495 AbstractCegarLoop]: Abstraction has 71 states and 78 transitions. [2022-11-23 14:57:15,850 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.3870967741935485) internal successors, (43), 31 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:57:15,850 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 78 transitions. [2022-11-23 14:57:15,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-11-23 14:57:15,851 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:57:15,851 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:57:15,862 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-11-23 14:57:16,062 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-11-23 14:57:16,062 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:57:16,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:57:16,062 INFO L85 PathProgramCache]: Analyzing trace with hash -418900427, now seen corresponding path program 23 times [2022-11-23 14:57:16,062 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:57:16,062 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1796705086] [2022-11-23 14:57:16,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:57:16,063 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:57:16,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:57:16,389 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 28 proven. 53 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2022-11-23 14:57:16,390 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:57:16,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1796705086] [2022-11-23 14:57:16,390 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1796705086] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:57:16,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1716737675] [2022-11-23 14:57:16,390 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:57:16,390 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:57:16,390 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:57:16,393 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:57:16,429 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-23 14:57:16,599 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-23 14:57:16,599 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:57:16,602 INFO L263 TraceCheckSpWp]: Trace formula consists of 310 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-23 14:57:16,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:57:16,988 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2022-11-23 14:57:16,988 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:57:17,261 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2022-11-23 14:57:17,261 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1716737675] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:57:17,261 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1127427945] [2022-11-23 14:57:17,263 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 14:57:17,263 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:57:17,263 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:57:17,263 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:57:17,263 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:57:17,275 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:57:17,303 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-23 14:57:17,304 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-23 14:57:17,316 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:57:17,342 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 14:57:17,342 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 14:57:17,365 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:57:17,366 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-23 14:57:17,403 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:57:17,406 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:57:17,419 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 14:57:17,419 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-11-23 14:57:17,456 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 14:57:17,550 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:57:18,305 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10552#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:57:18,305 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:57:18,305 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:57:18,305 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2022-11-23 14:57:18,305 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1963365500] [2022-11-23 14:57:18,305 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:57:18,306 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-11-23 14:57:18,306 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:57:18,306 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-11-23 14:57:18,307 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=308, Invalid=1672, Unknown=0, NotChecked=0, Total=1980 [2022-11-23 14:57:18,307 INFO L87 Difference]: Start difference. First operand 71 states and 78 transitions. Second operand has 40 states, 40 states have (on average 1.575) internal successors, (63), 40 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:57:18,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:57:18,728 INFO L93 Difference]: Finished difference Result 96 states and 108 transitions. [2022-11-23 14:57:18,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-23 14:57:18,729 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.575) internal successors, (63), 40 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2022-11-23 14:57:18,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:57:18,729 INFO L225 Difference]: With dead ends: 96 [2022-11-23 14:57:18,729 INFO L226 Difference]: Without dead ends: 55 [2022-11-23 14:57:18,730 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 93 SyntacticMatches, 36 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2294 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=585, Invalid=2495, Unknown=0, NotChecked=0, Total=3080 [2022-11-23 14:57:18,730 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 163 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 367 mSolverCounterSat, 180 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 163 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 547 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 180 IncrementalHoareTripleChecker+Valid, 367 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 14:57:18,730 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [163 Valid, 7 Invalid, 547 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [180 Valid, 367 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 14:57:18,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-11-23 14:57:18,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2022-11-23 14:57:18,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.0925925925925926) internal successors, (59), 54 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:57:18,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 59 transitions. [2022-11-23 14:57:18,760 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 59 transitions. Word has length 51 [2022-11-23 14:57:18,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:57:18,760 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 59 transitions. [2022-11-23 14:57:18,760 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.575) internal successors, (63), 40 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:57:18,760 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 59 transitions. [2022-11-23 14:57:18,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-11-23 14:57:18,761 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:57:18,761 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:57:18,766 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-11-23 14:57:18,961 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:57:18,961 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:57:18,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:57:18,962 INFO L85 PathProgramCache]: Analyzing trace with hash 330831805, now seen corresponding path program 24 times [2022-11-23 14:57:18,962 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:57:18,962 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1409590579] [2022-11-23 14:57:18,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:57:18,962 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:57:19,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:57:27,524 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 10 proven. 215 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:57:27,524 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:57:27,524 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1409590579] [2022-11-23 14:57:27,525 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1409590579] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:57:27,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1461288954] [2022-11-23 14:57:27,525 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 14:57:27,525 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:57:27,525 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:57:27,526 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:57:27,528 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-23 14:57:27,652 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 14:57:27,652 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:57:27,656 WARN L261 TraceCheckSpWp]: Trace formula consists of 325 conjuncts, 174 conjunts are in the unsatisfiable core [2022-11-23 14:57:27,659 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:57:28,086 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-23 14:57:32,325 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:57:32,327 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:57:32,327 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 14 [2022-11-23 14:57:32,499 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:57:32,499 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:57:41,768 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 180 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-23 14:57:41,768 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1461288954] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:57:41,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2051421990] [2022-11-23 14:57:41,769 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 14:57:41,769 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:57:41,770 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:57:41,770 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:57:41,770 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:57:41,785 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:57:41,809 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-23 14:57:41,810 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-23 14:57:41,821 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:57:41,846 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 14:57:41,847 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 14:57:41,865 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:57:41,866 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-23 14:57:41,908 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:57:41,911 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:57:41,925 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 14:57:41,926 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-11-23 14:57:41,964 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 14:57:42,049 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:57:46,608 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11305#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:57:46,608 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:57:46,608 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:57:46,608 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 51, 42] total 119 [2022-11-23 14:57:46,608 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1889867325] [2022-11-23 14:57:46,608 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:57:46,609 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 119 states [2022-11-23 14:57:46,609 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:57:46,609 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2022-11-23 14:57:46,610 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=481, Invalid=14771, Unknown=0, NotChecked=0, Total=15252 [2022-11-23 14:57:46,610 INFO L87 Difference]: Start difference. First operand 55 states and 59 transitions. Second operand has 119 states, 119 states have (on average 1.0924369747899159) internal successors, (130), 119 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:57:58,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:57:58,002 INFO L93 Difference]: Finished difference Result 89 states and 96 transitions. [2022-11-23 14:57:58,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2022-11-23 14:57:58,004 INFO L78 Accepts]: Start accepts. Automaton has has 119 states, 119 states have (on average 1.0924369747899159) internal successors, (130), 119 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 54 [2022-11-23 14:57:58,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:57:58,005 INFO L225 Difference]: With dead ends: 89 [2022-11-23 14:57:58,005 INFO L226 Difference]: Without dead ends: 86 [2022-11-23 14:57:58,006 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 56 SyntacticMatches, 35 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8555 ImplicationChecksByTransitivity, 27.1s TimeCoverageRelationStatistics Valid=910, Invalid=22652, Unknown=0, NotChecked=0, Total=23562 [2022-11-23 14:57:58,007 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 21 mSDsluCounter, 140 mSDsCounter, 0 mSdLazyCounter, 3959 mSolverCounterSat, 100 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 4059 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 100 IncrementalHoareTripleChecker+Valid, 3959 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.6s IncrementalHoareTripleChecker+Time [2022-11-23 14:57:58,007 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 143 Invalid, 4059 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [100 Valid, 3959 Invalid, 0 Unknown, 0 Unchecked, 4.6s Time] [2022-11-23 14:57:58,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-11-23 14:57:58,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 77. [2022-11-23 14:57:58,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 76 states have (on average 1.105263157894737) internal successors, (84), 76 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:57:58,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 84 transitions. [2022-11-23 14:57:58,047 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 84 transitions. Word has length 54 [2022-11-23 14:57:58,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:57:58,047 INFO L495 AbstractCegarLoop]: Abstraction has 77 states and 84 transitions. [2022-11-23 14:57:58,047 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 119 states, 119 states have (on average 1.0924369747899159) internal successors, (130), 119 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:57:58,048 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 84 transitions. [2022-11-23 14:57:58,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-11-23 14:57:58,048 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:57:58,048 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:57:58,054 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-11-23 14:57:58,248 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:57:58,249 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:57:58,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:57:58,249 INFO L85 PathProgramCache]: Analyzing trace with hash -1798302751, now seen corresponding path program 25 times [2022-11-23 14:57:58,249 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:57:58,249 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2084448433] [2022-11-23 14:57:58,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:57:58,250 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:57:58,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:57:58,638 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 46 proven. 54 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2022-11-23 14:57:58,638 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:57:58,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2084448433] [2022-11-23 14:57:58,639 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2084448433] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:57:58,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [74960037] [2022-11-23 14:57:58,639 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 14:57:58,639 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:57:58,639 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:57:58,640 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:57:58,643 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-11-23 14:57:58,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:57:58,764 INFO L263 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-23 14:57:58,765 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:57:59,009 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2022-11-23 14:57:59,010 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:57:59,206 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2022-11-23 14:57:59,207 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [74960037] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:57:59,207 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [867012333] [2022-11-23 14:57:59,208 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 14:57:59,208 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:57:59,208 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:57:59,209 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:57:59,209 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:57:59,230 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:57:59,256 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-23 14:57:59,257 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-23 14:57:59,266 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:57:59,291 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 14:57:59,292 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 14:57:59,308 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:57:59,309 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-23 14:57:59,342 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:57:59,343 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:57:59,366 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 14:57:59,366 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-11-23 14:57:59,447 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 14:57:59,534 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:58:00,379 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12047#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:58:00,379 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:58:00,379 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:58:00,379 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 34 [2022-11-23 14:58:00,380 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2102177992] [2022-11-23 14:58:00,380 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:58:00,380 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-11-23 14:58:00,380 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:58:00,381 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-11-23 14:58:00,381 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=1182, Unknown=0, NotChecked=0, Total=1482 [2022-11-23 14:58:00,381 INFO L87 Difference]: Start difference. First operand 77 states and 84 transitions. Second operand has 34 states, 34 states have (on average 1.3529411764705883) internal successors, (46), 34 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:58:00,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:58:00,785 INFO L93 Difference]: Finished difference Result 152 states and 166 transitions. [2022-11-23 14:58:00,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-11-23 14:58:00,786 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.3529411764705883) internal successors, (46), 34 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 55 [2022-11-23 14:58:00,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:58:00,787 INFO L225 Difference]: With dead ends: 152 [2022-11-23 14:58:00,787 INFO L226 Difference]: Without dead ends: 78 [2022-11-23 14:58:00,787 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 109 SyntacticMatches, 39 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1469 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=477, Invalid=1875, Unknown=0, NotChecked=0, Total=2352 [2022-11-23 14:58:00,788 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 16 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 349 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 412 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 349 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 14:58:00,788 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 15 Invalid, 412 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 349 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 14:58:00,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2022-11-23 14:58:00,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2022-11-23 14:58:00,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 77 states have (on average 1.103896103896104) internal successors, (85), 77 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:58:00,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 85 transitions. [2022-11-23 14:58:00,810 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 85 transitions. Word has length 55 [2022-11-23 14:58:00,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:58:00,811 INFO L495 AbstractCegarLoop]: Abstraction has 78 states and 85 transitions. [2022-11-23 14:58:00,811 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 1.3529411764705883) internal successors, (46), 34 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:58:00,811 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 85 transitions. [2022-11-23 14:58:00,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-11-23 14:58:00,811 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:58:00,811 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:58:00,816 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-11-23 14:58:01,012 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-11-23 14:58:01,012 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:58:01,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:58:01,012 INFO L85 PathProgramCache]: Analyzing trace with hash -562818900, now seen corresponding path program 26 times [2022-11-23 14:58:01,012 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:58:01,013 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2028059941] [2022-11-23 14:58:01,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:58:01,013 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:58:01,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:58:01,431 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 36 proven. 64 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2022-11-23 14:58:01,432 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:58:01,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2028059941] [2022-11-23 14:58:01,432 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2028059941] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:58:01,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1496724733] [2022-11-23 14:58:01,432 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:58:01,432 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:58:01,433 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:58:01,434 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:58:01,453 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-11-23 14:58:01,678 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-23 14:58:01,678 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:58:01,681 INFO L263 TraceCheckSpWp]: Trace formula consists of 339 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-23 14:58:01,682 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:58:02,095 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2022-11-23 14:58:02,095 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:58:02,414 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2022-11-23 14:58:02,415 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1496724733] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:58:02,415 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1251930189] [2022-11-23 14:58:02,416 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 14:58:02,416 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:58:02,417 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:58:02,417 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:58:02,417 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:58:02,436 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:58:02,467 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-23 14:58:02,467 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-23 14:58:02,476 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:58:02,501 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 14:58:02,502 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 14:58:02,526 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:58:02,526 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-23 14:58:02,565 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:58:02,566 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:58:02,588 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 14:58:02,588 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-11-23 14:58:02,652 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 14:58:02,750 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:58:03,492 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12893#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:58:03,492 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:58:03,492 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:58:03,492 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 44 [2022-11-23 14:58:03,492 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1036508183] [2022-11-23 14:58:03,492 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:58:03,493 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-11-23 14:58:03,493 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:58:03,493 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-11-23 14:58:03,493 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=364, Invalid=1988, Unknown=0, NotChecked=0, Total=2352 [2022-11-23 14:58:03,493 INFO L87 Difference]: Start difference. First operand 78 states and 85 transitions. Second operand has 44 states, 44 states have (on average 1.5909090909090908) internal successors, (70), 44 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:58:04,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:58:04,005 INFO L93 Difference]: Finished difference Result 105 states and 117 transitions. [2022-11-23 14:58:04,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-23 14:58:04,005 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.5909090909090908) internal successors, (70), 44 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2022-11-23 14:58:04,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:58:04,006 INFO L225 Difference]: With dead ends: 105 [2022-11-23 14:58:04,006 INFO L226 Difference]: Without dead ends: 60 [2022-11-23 14:58:04,007 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 112 SyntacticMatches, 30 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2321 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=696, Invalid=2964, Unknown=0, NotChecked=0, Total=3660 [2022-11-23 14:58:04,007 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 122 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 562 mSolverCounterSat, 145 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 122 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 707 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 145 IncrementalHoareTripleChecker+Valid, 562 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 14:58:04,007 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [122 Valid, 17 Invalid, 707 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [145 Valid, 562 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 14:58:04,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2022-11-23 14:58:04,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2022-11-23 14:58:04,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.0847457627118644) internal successors, (64), 59 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:58:04,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 64 transitions. [2022-11-23 14:58:04,028 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 64 transitions. Word has length 56 [2022-11-23 14:58:04,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:58:04,028 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 64 transitions. [2022-11-23 14:58:04,029 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.5909090909090908) internal successors, (70), 44 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:58:04,029 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 64 transitions. [2022-11-23 14:58:04,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-11-23 14:58:04,029 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:58:04,029 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:58:04,037 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-11-23 14:58:04,236 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-11-23 14:58:04,236 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:58:04,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:58:04,236 INFO L85 PathProgramCache]: Analyzing trace with hash -448027930, now seen corresponding path program 27 times [2022-11-23 14:58:04,237 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:58:04,237 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1308163190] [2022-11-23 14:58:04,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:58:04,237 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:58:04,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:58:14,905 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 15 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:58:14,905 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:58:14,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1308163190] [2022-11-23 14:58:14,905 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1308163190] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:58:14,906 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2121105666] [2022-11-23 14:58:14,906 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 14:58:14,906 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:58:14,906 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:58:14,907 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:58:14,909 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-11-23 14:58:15,050 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 14:58:15,051 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:58:15,055 WARN L261 TraceCheckSpWp]: Trace formula consists of 354 conjuncts, 194 conjunts are in the unsatisfiable core [2022-11-23 14:58:15,058 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:58:15,605 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-23 14:58:21,212 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:58:21,214 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:58:21,215 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 14 [2022-11-23 14:58:21,412 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 0 proven. 275 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:58:21,412 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:58:33,963 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 0 proven. 220 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-23 14:58:33,963 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2121105666] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:58:33,963 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1050975125] [2022-11-23 14:58:33,965 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 14:58:33,965 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:58:33,965 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:58:33,965 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:58:33,966 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:58:33,981 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:58:34,008 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-23 14:58:34,008 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-23 14:58:34,022 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:58:34,050 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 14:58:34,050 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 14:58:34,072 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:58:34,073 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-23 14:58:34,128 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:58:34,129 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:58:34,152 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 14:58:34,152 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-11-23 14:58:34,229 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 14:58:34,318 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:58:40,126 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13720#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:58:40,127 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:58:40,127 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:58:40,127 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 56, 46] total 133 [2022-11-23 14:58:40,127 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [630442268] [2022-11-23 14:58:40,127 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:58:40,128 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 133 states [2022-11-23 14:58:40,128 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:58:40,128 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 133 interpolants. [2022-11-23 14:58:40,129 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=612, Invalid=18294, Unknown=0, NotChecked=0, Total=18906 [2022-11-23 14:58:40,130 INFO L87 Difference]: Start difference. First operand 60 states and 64 transitions. Second operand has 133 states, 133 states have (on average 1.0827067669172932) internal successors, (144), 133 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) [2022-11-23 14:58:55,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:58:55,166 INFO L93 Difference]: Finished difference Result 97 states and 104 transitions. [2022-11-23 14:58:55,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2022-11-23 14:58:55,167 INFO L78 Accepts]: Start accepts. Automaton has has 133 states, 133 states have (on average 1.0827067669172932) internal successors, (144), 133 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) Word has length 59 [2022-11-23 14:58:55,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:58:55,168 INFO L225 Difference]: With dead ends: 97 [2022-11-23 14:58:55,168 INFO L226 Difference]: Without dead ends: 94 [2022-11-23 14:58:55,169 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 266 GetRequests, 60 SyntacticMatches, 37 SemanticMatches, 169 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10649 ImplicationChecksByTransitivity, 35.8s TimeCoverageRelationStatistics Valid=1121, Invalid=27949, Unknown=0, NotChecked=0, Total=29070 [2022-11-23 14:58:55,170 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 21 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 4674 mSolverCounterSat, 106 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 153 SdHoareTripleChecker+Invalid, 4780 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 106 IncrementalHoareTripleChecker+Valid, 4674 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.2s IncrementalHoareTripleChecker+Time [2022-11-23 14:58:55,170 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 153 Invalid, 4780 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [106 Valid, 4674 Invalid, 0 Unknown, 0 Unchecked, 6.2s Time] [2022-11-23 14:58:55,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2022-11-23 14:58:55,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 84. [2022-11-23 14:58:55,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 83 states have (on average 1.0963855421686748) internal successors, (91), 83 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:58:55,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 91 transitions. [2022-11-23 14:58:55,209 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 91 transitions. Word has length 59 [2022-11-23 14:58:55,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:58:55,209 INFO L495 AbstractCegarLoop]: Abstraction has 84 states and 91 transitions. [2022-11-23 14:58:55,209 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 133 states, 133 states have (on average 1.0827067669172932) internal successors, (144), 133 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) [2022-11-23 14:58:55,209 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 91 transitions. [2022-11-23 14:58:55,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-23 14:58:55,210 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:58:55,210 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:58:55,216 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-11-23 14:58:55,410 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:58:55,411 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:58:55,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:58:55,411 INFO L85 PathProgramCache]: Analyzing trace with hash -334708480, now seen corresponding path program 28 times [2022-11-23 14:58:55,411 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:58:55,411 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1910928021] [2022-11-23 14:58:55,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:58:55,411 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:58:55,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:58:55,884 INFO L134 CoverageAnalysis]: Checked inductivity of 286 backedges. 56 proven. 65 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2022-11-23 14:58:55,884 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:58:55,884 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1910928021] [2022-11-23 14:58:55,884 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1910928021] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:58:55,884 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [722287328] [2022-11-23 14:58:55,884 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 14:58:55,885 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:58:55,885 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:58:55,886 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:58:55,888 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-11-23 14:58:56,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:58:56,048 INFO L263 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-23 14:58:56,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:58:56,385 INFO L134 CoverageAnalysis]: Checked inductivity of 286 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2022-11-23 14:58:56,385 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:58:56,663 INFO L134 CoverageAnalysis]: Checked inductivity of 286 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2022-11-23 14:58:56,664 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [722287328] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:58:56,664 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2038902107] [2022-11-23 14:58:56,669 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 14:58:56,670 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:58:56,671 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:58:56,671 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:58:56,671 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:58:56,689 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:58:56,720 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 14:58:56,721 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 14:58:56,737 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:58:56,738 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-23 14:58:56,759 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:58:56,760 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-23 14:58:56,830 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:58:56,833 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:58:56,849 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 14:58:56,849 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-11-23 14:58:56,895 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 14:58:57,002 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:58:57,875 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14531#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:58:57,875 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:58:57,876 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:58:57,876 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 37 [2022-11-23 14:58:57,876 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [389710729] [2022-11-23 14:58:57,876 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:58:57,877 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-11-23 14:58:57,877 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:58:57,877 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-11-23 14:58:57,878 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=350, Invalid=1372, Unknown=0, NotChecked=0, Total=1722 [2022-11-23 14:58:57,878 INFO L87 Difference]: Start difference. First operand 84 states and 91 transitions. Second operand has 37 states, 37 states have (on average 1.3243243243243243) internal successors, (49), 37 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:58:58,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:58:58,425 INFO L93 Difference]: Finished difference Result 166 states and 180 transitions. [2022-11-23 14:58:58,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-11-23 14:58:58,425 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.3243243243243243) internal successors, (49), 37 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2022-11-23 14:58:58,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:58:58,426 INFO L225 Difference]: With dead ends: 166 [2022-11-23 14:58:58,426 INFO L226 Difference]: Without dead ends: 85 [2022-11-23 14:58:58,427 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 130 SyntacticMatches, 32 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1375 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=561, Invalid=2195, Unknown=0, NotChecked=0, Total=2756 [2022-11-23 14:58:58,427 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 18 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 405 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 473 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 405 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 14:58:58,428 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 21 Invalid, 473 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 405 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 14:58:58,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2022-11-23 14:58:58,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2022-11-23 14:58:58,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.0952380952380953) internal successors, (92), 84 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) [2022-11-23 14:58:58,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 92 transitions. [2022-11-23 14:58:58,460 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 92 transitions. Word has length 60 [2022-11-23 14:58:58,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:58:58,460 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 92 transitions. [2022-11-23 14:58:58,460 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.3243243243243243) internal successors, (49), 37 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:58:58,460 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 92 transitions. [2022-11-23 14:58:58,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-11-23 14:58:58,461 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:58:58,461 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:58:58,468 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2022-11-23 14:58:58,668 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:58:58,668 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:58:58,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:58:58,668 INFO L85 PathProgramCache]: Analyzing trace with hash -1880225003, now seen corresponding path program 29 times [2022-11-23 14:58:58,669 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:58:58,669 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [20195847] [2022-11-23 14:58:58,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:58:58,669 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:58:58,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:58:59,067 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 45 proven. 76 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2022-11-23 14:58:59,068 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:58:59,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [20195847] [2022-11-23 14:58:59,068 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [20195847] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:58:59,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [518937426] [2022-11-23 14:58:59,068 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:58:59,068 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:58:59,069 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:58:59,069 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:58:59,072 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-11-23 14:58:59,359 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-11-23 14:58:59,359 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:58:59,362 INFO L263 TraceCheckSpWp]: Trace formula consists of 368 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-23 14:58:59,363 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:58:59,890 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2022-11-23 14:58:59,891 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:59:00,311 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2022-11-23 14:59:00,311 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [518937426] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:59:00,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2032628912] [2022-11-23 14:59:00,314 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 14:59:00,314 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:59:00,315 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:59:00,315 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:59:00,315 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:59:00,329 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:59:00,358 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-23 14:59:00,358 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-23 14:59:00,373 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:59:00,405 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 14:59:00,406 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 14:59:00,428 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:59:00,429 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-23 14:59:00,476 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:59:00,479 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:59:00,494 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 14:59:00,494 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-11-23 14:59:00,548 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 14:59:00,661 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:59:01,811 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15455#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:59:01,811 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:59:01,812 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:59:01,812 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 48 [2022-11-23 14:59:01,812 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1877340383] [2022-11-23 14:59:01,812 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:59:01,812 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-11-23 14:59:01,813 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:59:01,813 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-11-23 14:59:01,813 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=425, Invalid=2331, Unknown=0, NotChecked=0, Total=2756 [2022-11-23 14:59:01,814 INFO L87 Difference]: Start difference. First operand 85 states and 92 transitions. Second operand has 48 states, 48 states have (on average 1.5625) internal successors, (75), 48 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:59:02,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:59:02,388 INFO L93 Difference]: Finished difference Result 114 states and 126 transitions. [2022-11-23 14:59:02,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-23 14:59:02,389 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 1.5625) internal successors, (75), 48 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 61 [2022-11-23 14:59:02,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:59:02,390 INFO L225 Difference]: With dead ends: 114 [2022-11-23 14:59:02,390 INFO L226 Difference]: Without dead ends: 65 [2022-11-23 14:59:02,390 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 111 SyntacticMatches, 44 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3380 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=817, Invalid=3473, Unknown=0, NotChecked=0, Total=4290 [2022-11-23 14:59:02,391 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 293 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 480 mSolverCounterSat, 201 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 293 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 681 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 201 IncrementalHoareTripleChecker+Valid, 480 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 14:59:02,391 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [293 Valid, 11 Invalid, 681 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [201 Valid, 480 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 14:59:02,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-11-23 14:59:02,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2022-11-23 14:59:02,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.078125) internal successors, (69), 64 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:59:02,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 69 transitions. [2022-11-23 14:59:02,422 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 69 transitions. Word has length 61 [2022-11-23 14:59:02,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:59:02,423 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 69 transitions. [2022-11-23 14:59:02,423 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 1.5625) internal successors, (75), 48 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:59:02,423 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 69 transitions. [2022-11-23 14:59:02,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-11-23 14:59:02,423 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:59:02,424 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:59:02,434 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-11-23 14:59:02,625 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:59:02,625 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:59:02,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:59:02,625 INFO L85 PathProgramCache]: Analyzing trace with hash -969761187, now seen corresponding path program 30 times [2022-11-23 14:59:02,626 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:59:02,626 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1438127320] [2022-11-23 14:59:02,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:59:02,626 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:59:02,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:59:14,256 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 15 proven. 315 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:59:14,257 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:59:14,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1438127320] [2022-11-23 14:59:14,257 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1438127320] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:59:14,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1423511961] [2022-11-23 14:59:14,257 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 14:59:14,257 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:59:14,257 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:59:14,258 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:59:14,260 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-11-23 14:59:14,414 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 14:59:14,415 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:59:14,419 WARN L261 TraceCheckSpWp]: Trace formula consists of 383 conjuncts, 210 conjunts are in the unsatisfiable core [2022-11-23 14:59:14,422 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:59:15,180 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-23 14:59:22,559 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:59:22,561 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:59:22,562 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 14 [2022-11-23 14:59:22,828 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 0 proven. 330 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:59:22,828 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:59:38,785 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 0 proven. 264 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-11-23 14:59:38,785 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1423511961] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:59:38,785 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1204777366] [2022-11-23 14:59:38,786 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 14:59:38,786 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:59:38,786 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:59:38,786 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:59:38,787 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:59:38,798 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:59:38,821 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-23 14:59:38,821 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-23 14:59:38,831 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:59:38,856 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 14:59:38,856 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 14:59:38,876 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:59:38,877 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-23 14:59:38,920 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:59:38,922 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:59:38,935 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 14:59:38,935 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-11-23 14:59:38,973 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 14:59:39,067 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:59:46,226 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16355#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:59:46,227 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:59:46,227 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:59:46,227 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 61, 50] total 146 [2022-11-23 14:59:46,227 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1964963671] [2022-11-23 14:59:46,227 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:59:46,228 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 146 states [2022-11-23 14:59:46,228 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:59:46,228 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 146 interpolants. [2022-11-23 14:59:46,229 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=580, Invalid=22070, Unknown=0, NotChecked=0, Total=22650 [2022-11-23 14:59:46,229 INFO L87 Difference]: Start difference. First operand 65 states and 69 transitions. Second operand has 146 states, 146 states have (on average 1.0753424657534247) internal successors, (157), 146 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:00:06,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:00:06,285 INFO L93 Difference]: Finished difference Result 105 states and 112 transitions. [2022-11-23 15:00:06,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2022-11-23 15:00:06,286 INFO L78 Accepts]: Start accepts. Automaton has has 146 states, 146 states have (on average 1.0753424657534247) internal successors, (157), 146 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2022-11-23 15:00:06,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:00:06,287 INFO L225 Difference]: With dead ends: 105 [2022-11-23 15:00:06,287 INFO L226 Difference]: Without dead ends: 102 [2022-11-23 15:00:06,289 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 64 SyntacticMatches, 40 SemanticMatches, 185 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11032 ImplicationChecksByTransitivity, 46.8s TimeCoverageRelationStatistics Valid=1176, Invalid=33606, Unknown=0, NotChecked=0, Total=34782 [2022-11-23 15:00:06,290 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 24 mSDsluCounter, 184 mSDsCounter, 0 mSdLazyCounter, 6129 mSolverCounterSat, 143 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 187 SdHoareTripleChecker+Invalid, 6272 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 143 IncrementalHoareTripleChecker+Valid, 6129 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.0s IncrementalHoareTripleChecker+Time [2022-11-23 15:00:06,290 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 187 Invalid, 6272 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [143 Valid, 6129 Invalid, 0 Unknown, 0 Unchecked, 8.0s Time] [2022-11-23 15:00:06,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2022-11-23 15:00:06,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 91. [2022-11-23 15:00:06,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 90 states have (on average 1.0888888888888888) internal successors, (98), 90 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:00:06,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 98 transitions. [2022-11-23 15:00:06,347 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 98 transitions. Word has length 64 [2022-11-23 15:00:06,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:00:06,347 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 98 transitions. [2022-11-23 15:00:06,347 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 146 states, 146 states have (on average 1.0753424657534247) internal successors, (157), 146 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:00:06,348 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 98 transitions. [2022-11-23 15:00:06,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-11-23 15:00:06,348 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:00:06,348 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:00:06,355 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2022-11-23 15:00:06,554 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:00:06,555 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:00:06,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:00:06,555 INFO L85 PathProgramCache]: Analyzing trace with hash 634082625, now seen corresponding path program 31 times [2022-11-23 15:00:06,555 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:00:06,555 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [247024280] [2022-11-23 15:00:06,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:00:06,556 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:00:06,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:00:07,008 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 67 proven. 77 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2022-11-23 15:00:07,008 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:00:07,008 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [247024280] [2022-11-23 15:00:07,008 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [247024280] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:00:07,008 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [13617612] [2022-11-23 15:00:07,009 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 15:00:07,009 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:00:07,009 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:00:07,010 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:00:07,013 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-11-23 15:00:07,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:00:07,164 INFO L263 TraceCheckSpWp]: Trace formula consists of 388 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-23 15:00:07,165 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:00:07,498 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2022-11-23 15:00:07,498 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:00:07,761 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2022-11-23 15:00:07,761 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [13617612] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:00:07,761 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1451907434] [2022-11-23 15:00:07,763 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 15:00:07,763 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:00:07,763 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:00:07,763 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:00:07,763 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:00:07,775 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:00:07,799 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-23 15:00:07,799 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-23 15:00:07,809 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:00:07,834 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 15:00:07,834 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 15:00:07,852 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:00:07,853 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-23 15:00:07,898 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:00:07,899 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 15:00:07,922 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 15:00:07,923 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-11-23 15:00:07,988 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 15:00:08,066 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:00:08,867 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17235#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 15:00:08,868 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:00:08,868 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:00:08,868 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 40 [2022-11-23 15:00:08,868 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1395887168] [2022-11-23 15:00:08,868 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:00:08,869 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-11-23 15:00:08,869 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:00:08,869 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-11-23 15:00:08,869 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=404, Invalid=1576, Unknown=0, NotChecked=0, Total=1980 [2022-11-23 15:00:08,870 INFO L87 Difference]: Start difference. First operand 91 states and 98 transitions. Second operand has 40 states, 40 states have (on average 1.3) internal successors, (52), 40 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:00:09,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:00:09,423 INFO L93 Difference]: Finished difference Result 180 states and 194 transitions. [2022-11-23 15:00:09,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-23 15:00:09,423 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.3) internal successors, (52), 40 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 65 [2022-11-23 15:00:09,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:00:09,424 INFO L225 Difference]: With dead ends: 180 [2022-11-23 15:00:09,424 INFO L226 Difference]: Without dead ends: 92 [2022-11-23 15:00:09,424 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 141 SyntacticMatches, 35 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1609 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=652, Invalid=2540, Unknown=0, NotChecked=0, Total=3192 [2022-11-23 15:00:09,425 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 24 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 429 mSolverCounterSat, 82 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 511 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 82 IncrementalHoareTripleChecker+Valid, 429 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 15:00:09,425 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 19 Invalid, 511 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [82 Valid, 429 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 15:00:09,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2022-11-23 15:00:09,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2022-11-23 15:00:09,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 91 states have (on average 1.0879120879120878) internal successors, (99), 91 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:00:09,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 99 transitions. [2022-11-23 15:00:09,461 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 99 transitions. Word has length 65 [2022-11-23 15:00:09,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:00:09,462 INFO L495 AbstractCegarLoop]: Abstraction has 92 states and 99 transitions. [2022-11-23 15:00:09,462 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.3) internal successors, (52), 40 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:00:09,462 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 99 transitions. [2022-11-23 15:00:09,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-11-23 15:00:09,462 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:00:09,462 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:00:09,468 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2022-11-23 15:00:09,663 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2022-11-23 15:00:09,663 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:00:09,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:00:09,663 INFO L85 PathProgramCache]: Analyzing trace with hash 821956684, now seen corresponding path program 32 times [2022-11-23 15:00:09,663 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:00:09,663 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [895935672] [2022-11-23 15:00:09,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:00:09,664 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:00:09,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:00:10,077 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 55 proven. 89 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2022-11-23 15:00:10,077 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:00:10,077 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [895935672] [2022-11-23 15:00:10,077 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [895935672] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:00:10,077 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1358491586] [2022-11-23 15:00:10,077 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 15:00:10,077 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:00:10,077 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:00:10,078 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:00:10,081 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-11-23 15:00:10,336 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-11-23 15:00:10,336 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:00:10,339 INFO L263 TraceCheckSpWp]: Trace formula consists of 397 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-23 15:00:10,341 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:00:10,861 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 66 proven. 78 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2022-11-23 15:00:10,862 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:00:11,262 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 66 proven. 78 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2022-11-23 15:00:11,263 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1358491586] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:00:11,263 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [152038288] [2022-11-23 15:00:11,264 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 15:00:11,264 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:00:11,264 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:00:11,264 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:00:11,264 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:00:11,279 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:00:11,303 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 15:00:11,304 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 15:00:11,316 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:00:11,317 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-23 15:00:11,338 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:00:11,338 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-23 15:00:11,384 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:00:11,386 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:00:11,399 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 15:00:11,400 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-11-23 15:00:11,440 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 15:00:11,532 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:00:12,886 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18237#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 15:00:12,886 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:00:12,886 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:00:12,886 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 52 [2022-11-23 15:00:12,887 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [70857831] [2022-11-23 15:00:12,887 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:00:12,887 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-11-23 15:00:12,887 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:00:12,888 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-11-23 15:00:12,888 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=491, Invalid=2701, Unknown=0, NotChecked=0, Total=3192 [2022-11-23 15:00:12,888 INFO L87 Difference]: Start difference. First operand 92 states and 99 transitions. Second operand has 52 states, 52 states have (on average 1.25) internal successors, (65), 52 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:00:13,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:00:13,495 INFO L93 Difference]: Finished difference Result 123 states and 135 transitions. [2022-11-23 15:00:13,495 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-11-23 15:00:13,495 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 1.25) internal successors, (65), 52 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2022-11-23 15:00:13,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:00:13,496 INFO L225 Difference]: With dead ends: 123 [2022-11-23 15:00:13,496 INFO L226 Difference]: Without dead ends: 70 [2022-11-23 15:00:13,497 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 120 SyntacticMatches, 48 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4001 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=948, Invalid=4022, Unknown=0, NotChecked=0, Total=4970 [2022-11-23 15:00:13,498 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 210 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 583 mSolverCounterSat, 222 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 210 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 805 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 222 IncrementalHoareTripleChecker+Valid, 583 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 15:00:13,498 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [210 Valid, 15 Invalid, 805 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [222 Valid, 583 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 15:00:13,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2022-11-23 15:00:13,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2022-11-23 15:00:13,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.0724637681159421) internal successors, (74), 69 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:00:13,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 74 transitions. [2022-11-23 15:00:13,526 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 74 transitions. Word has length 66 [2022-11-23 15:00:13,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:00:13,526 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 74 transitions. [2022-11-23 15:00:13,527 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 1.25) internal successors, (65), 52 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:00:13,527 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 74 transitions. [2022-11-23 15:00:13,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2022-11-23 15:00:13,527 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:00:13,527 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:00:13,533 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Ended with exit code 0 [2022-11-23 15:00:13,727 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:00:13,728 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:00:13,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:00:13,728 INFO L85 PathProgramCache]: Analyzing trace with hash -583338298, now seen corresponding path program 33 times [2022-11-23 15:00:13,729 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:00:13,729 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [325257722] [2022-11-23 15:00:13,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:00:13,729 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:00:13,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:00:27,454 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 3 proven. 387 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 15:00:27,454 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:00:27,454 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [325257722] [2022-11-23 15:00:27,454 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [325257722] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:00:27,454 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [984590204] [2022-11-23 15:00:27,455 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 15:00:27,455 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:00:27,455 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:00:27,456 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:00:27,458 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-11-23 15:00:27,628 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 15:00:27,628 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:00:27,634 WARN L261 TraceCheckSpWp]: Trace formula consists of 412 conjuncts, 230 conjunts are in the unsatisfiable core [2022-11-23 15:00:27,638 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:00:28,015 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-23 15:00:36,321 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 390 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 15:00:36,321 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:00:54,803 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 312 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-11-23 15:00:54,804 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [984590204] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:00:54,804 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2037334921] [2022-11-23 15:00:54,805 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 15:00:54,805 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:00:54,805 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:00:54,806 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:00:54,806 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:00:54,817 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:00:54,840 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-23 15:00:54,840 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-23 15:00:54,851 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:00:54,875 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 15:00:54,876 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 15:00:54,893 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:00:54,894 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-23 15:00:54,933 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:00:54,933 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 15:00:54,955 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 15:00:54,956 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-11-23 15:00:55,022 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 15:00:55,128 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:01:04,168 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19205#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 15:01:04,169 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:01:04,169 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:01:04,169 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 66, 54] total 154 [2022-11-23 15:01:04,169 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1192299256] [2022-11-23 15:01:04,169 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:01:04,170 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 154 states [2022-11-23 15:01:04,170 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:01:04,170 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 154 interpolants. [2022-11-23 15:01:04,171 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=735, Invalid=24387, Unknown=0, NotChecked=0, Total=25122 [2022-11-23 15:01:04,171 INFO L87 Difference]: Start difference. First operand 70 states and 74 transitions. Second operand has 154 states, 154 states have (on average 1.0714285714285714) internal successors, (165), 154 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:01:26,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:01:26,075 INFO L93 Difference]: Finished difference Result 113 states and 120 transitions. [2022-11-23 15:01:26,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2022-11-23 15:01:26,076 INFO L78 Accepts]: Start accepts. Automaton has has 154 states, 154 states have (on average 1.0714285714285714) internal successors, (165), 154 states have internal predecessors, (165), 0 states have call successors, (0), 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 [2022-11-23 15:01:26,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:01:26,077 INFO L225 Difference]: With dead ends: 113 [2022-11-23 15:01:26,077 INFO L226 Difference]: Without dead ends: 110 [2022-11-23 15:01:26,079 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 312 GetRequests, 69 SyntacticMatches, 47 SemanticMatches, 196 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13166 ImplicationChecksByTransitivity, 52.8s TimeCoverageRelationStatistics Valid=1390, Invalid=37616, Unknown=0, NotChecked=0, Total=39006 [2022-11-23 15:01:26,080 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 25 mSDsluCounter, 178 mSDsCounter, 0 mSdLazyCounter, 6514 mSolverCounterSat, 126 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 181 SdHoareTripleChecker+Invalid, 6640 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 126 IncrementalHoareTripleChecker+Valid, 6514 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.0s IncrementalHoareTripleChecker+Time [2022-11-23 15:01:26,080 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 181 Invalid, 6640 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [126 Valid, 6514 Invalid, 0 Unknown, 0 Unchecked, 9.0s Time] [2022-11-23 15:01:26,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2022-11-23 15:01:26,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 98. [2022-11-23 15:01:26,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 97 states have (on average 1.0824742268041236) internal successors, (105), 97 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:01:26,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 105 transitions. [2022-11-23 15:01:26,129 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 105 transitions. Word has length 69 [2022-11-23 15:01:26,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:01:26,129 INFO L495 AbstractCegarLoop]: Abstraction has 98 states and 105 transitions. [2022-11-23 15:01:26,129 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 154 states, 154 states have (on average 1.0714285714285714) internal successors, (165), 154 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:01:26,130 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 105 transitions. [2022-11-23 15:01:26,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-11-23 15:01:26,130 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:01:26,130 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:01:26,137 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2022-11-23 15:01:26,336 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2022-11-23 15:01:26,337 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:01:26,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:01:26,337 INFO L85 PathProgramCache]: Analyzing trace with hash 192508960, now seen corresponding path program 34 times [2022-11-23 15:01:26,337 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:01:26,337 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [294866305] [2022-11-23 15:01:26,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:01:26,337 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:01:26,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:01:26,792 INFO L134 CoverageAnalysis]: Checked inductivity of 403 backedges. 79 proven. 90 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2022-11-23 15:01:26,792 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:01:26,793 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [294866305] [2022-11-23 15:01:26,793 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [294866305] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:01:26,793 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [557932962] [2022-11-23 15:01:26,793 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 15:01:26,793 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:01:26,793 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:01:26,794 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:01:26,797 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-11-23 15:01:26,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:01:26,960 INFO L263 TraceCheckSpWp]: Trace formula consists of 417 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-23 15:01:26,962 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:01:27,360 INFO L134 CoverageAnalysis]: Checked inductivity of 403 backedges. 91 proven. 78 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2022-11-23 15:01:27,360 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:01:27,656 INFO L134 CoverageAnalysis]: Checked inductivity of 403 backedges. 91 proven. 78 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2022-11-23 15:01:27,657 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [557932962] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:01:27,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1395722378] [2022-11-23 15:01:27,658 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 15:01:27,658 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:01:27,658 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:01:27,658 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:01:27,658 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:01:27,671 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:01:27,695 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 15:01:27,695 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 15:01:27,704 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:01:27,705 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-23 15:01:27,727 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:01:27,728 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-23 15:01:27,769 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:01:27,770 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 15:01:27,792 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 15:01:27,792 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-11-23 15:01:27,863 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 15:01:27,938 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:01:28,802 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20154#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 15:01:28,803 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:01:28,803 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:01:28,803 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 43 [2022-11-23 15:01:28,803 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [989747127] [2022-11-23 15:01:28,803 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:01:28,804 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-11-23 15:01:28,804 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:01:28,804 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-11-23 15:01:28,804 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=462, Invalid=1794, Unknown=0, NotChecked=0, Total=2256 [2022-11-23 15:01:28,804 INFO L87 Difference]: Start difference. First operand 98 states and 105 transitions. Second operand has 43 states, 43 states have (on average 1.2790697674418605) internal successors, (55), 43 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:01:29,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:01:29,343 INFO L93 Difference]: Finished difference Result 194 states and 208 transitions. [2022-11-23 15:01:29,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-11-23 15:01:29,344 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.2790697674418605) internal successors, (55), 43 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 70 [2022-11-23 15:01:29,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:01:29,344 INFO L225 Difference]: With dead ends: 194 [2022-11-23 15:01:29,344 INFO L226 Difference]: Without dead ends: 99 [2022-11-23 15:01:29,345 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 152 SyntacticMatches, 38 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1861 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=750, Invalid=2910, Unknown=0, NotChecked=0, Total=3660 [2022-11-23 15:01:29,346 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 22 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 327 mSolverCounterSat, 94 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 421 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 327 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 15:01:29,346 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 11 Invalid, 421 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [94 Valid, 327 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 15:01:29,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-11-23 15:01:29,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2022-11-23 15:01:29,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 98 states have (on average 1.0816326530612246) internal successors, (106), 98 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:01:29,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 106 transitions. [2022-11-23 15:01:29,420 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 106 transitions. Word has length 70 [2022-11-23 15:01:29,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:01:29,421 INFO L495 AbstractCegarLoop]: Abstraction has 99 states and 106 transitions. [2022-11-23 15:01:29,421 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 1.2790697674418605) internal successors, (55), 43 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:01:29,421 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 106 transitions. [2022-11-23 15:01:29,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-11-23 15:01:29,422 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:01:29,422 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:01:29,434 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Ended with exit code 0 [2022-11-23 15:01:29,628 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:01:29,628 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:01:29,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:01:29,628 INFO L85 PathProgramCache]: Analyzing trace with hash 1552476149, now seen corresponding path program 35 times [2022-11-23 15:01:29,629 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:01:29,629 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [930205389] [2022-11-23 15:01:29,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:01:29,629 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:01:29,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:01:30,221 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 66 proven. 103 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2022-11-23 15:01:30,221 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:01:30,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [930205389] [2022-11-23 15:01:30,221 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [930205389] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:01:30,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [536256220] [2022-11-23 15:01:30,222 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 15:01:30,222 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:01:30,222 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:01:30,223 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:01:30,225 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-11-23 15:01:30,570 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2022-11-23 15:01:30,570 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:01:30,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 426 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-23 15:01:30,577 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:01:31,275 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 78 proven. 91 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2022-11-23 15:01:31,275 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:01:31,786 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 78 proven. 91 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2022-11-23 15:01:31,786 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [536256220] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:01:31,786 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2062267061] [2022-11-23 15:01:31,787 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 15:01:31,787 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:01:31,792 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:01:31,793 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:01:31,793 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:01:31,804 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:01:31,829 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 15:01:31,829 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 15:01:31,838 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:01:31,841 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-23 15:01:31,862 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:01:31,863 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-23 15:01:31,900 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:01:31,903 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:01:31,915 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 15:01:31,916 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-11-23 15:01:31,954 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 15:01:32,038 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:01:32,934 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21234#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 15:01:32,934 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:01:32,934 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:01:32,934 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 56 [2022-11-23 15:01:32,934 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1784586794] [2022-11-23 15:01:32,934 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:01:32,935 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2022-11-23 15:01:32,935 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:01:32,936 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2022-11-23 15:01:32,936 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=562, Invalid=3098, Unknown=0, NotChecked=0, Total=3660 [2022-11-23 15:01:32,936 INFO L87 Difference]: Start difference. First operand 99 states and 106 transitions. Second operand has 56 states, 56 states have (on average 1.4821428571428572) internal successors, (83), 56 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) [2022-11-23 15:01:33,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:01:33,603 INFO L93 Difference]: Finished difference Result 132 states and 144 transitions. [2022-11-23 15:01:33,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-11-23 15:01:33,604 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 1.4821428571428572) internal successors, (83), 56 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 71 [2022-11-23 15:01:33,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:01:33,605 INFO L225 Difference]: With dead ends: 132 [2022-11-23 15:01:33,605 INFO L226 Difference]: Without dead ends: 75 [2022-11-23 15:01:33,605 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 142 SyntacticMatches, 39 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3842 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1089, Invalid=4611, Unknown=0, NotChecked=0, Total=5700 [2022-11-23 15:01:33,606 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 214 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 650 mSolverCounterSat, 260 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 214 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 910 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 260 IncrementalHoareTripleChecker+Valid, 650 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-23 15:01:33,606 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [214 Valid, 15 Invalid, 910 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [260 Valid, 650 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-23 15:01:33,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2022-11-23 15:01:33,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2022-11-23 15:01:33,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.0675675675675675) internal successors, (79), 74 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:01:33,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 79 transitions. [2022-11-23 15:01:33,636 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 79 transitions. Word has length 71 [2022-11-23 15:01:33,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:01:33,636 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 79 transitions. [2022-11-23 15:01:33,636 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 1.4821428571428572) internal successors, (83), 56 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) [2022-11-23 15:01:33,637 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 79 transitions. [2022-11-23 15:01:33,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2022-11-23 15:01:33,637 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:01:33,637 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:01:33,645 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2022-11-23 15:01:33,845 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:01:33,845 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:01:33,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:01:33,846 INFO L85 PathProgramCache]: Analyzing trace with hash 966360317, now seen corresponding path program 36 times [2022-11-23 15:01:33,846 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:01:33,846 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1918605889] [2022-11-23 15:01:33,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:01:33,846 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:01:34,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:01:53,259 INFO L134 CoverageAnalysis]: Checked inductivity of 455 backedges. 3 proven. 452 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 15:01:53,259 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:01:53,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1918605889] [2022-11-23 15:01:53,259 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1918605889] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:01:53,260 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1661748720] [2022-11-23 15:01:53,260 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 15:01:53,260 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:01:53,260 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:01:53,261 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:01:53,264 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-11-23 15:01:53,441 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 15:01:53,441 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:01:53,447 WARN L261 TraceCheckSpWp]: Trace formula consists of 441 conjuncts, 246 conjunts are in the unsatisfiable core [2022-11-23 15:01:53,451 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:01:53,892 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-23 15:02:03,938 INFO L134 CoverageAnalysis]: Checked inductivity of 455 backedges. 0 proven. 455 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 15:02:03,938 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:02:26,551 INFO L134 CoverageAnalysis]: Checked inductivity of 455 backedges. 0 proven. 364 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2022-11-23 15:02:26,552 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1661748720] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:02:26,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [986775380] [2022-11-23 15:02:26,553 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 15:02:26,553 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:02:26,553 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:02:26,554 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:02:26,554 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:02:26,574 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:02:26,598 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 15:02:26,599 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 15:02:26,610 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:02:26,610 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-23 15:02:26,629 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:02:26,630 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-23 15:02:26,671 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:02:26,673 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:02:26,687 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 15:02:26,687 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-11-23 15:02:26,726 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 15:02:26,802 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:02:32,821 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22272#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 15:02:32,821 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:02:32,821 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:02:32,821 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 71, 58] total 164 [2022-11-23 15:02:32,821 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1089710701] [2022-11-23 15:02:32,821 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:02:32,822 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 164 states [2022-11-23 15:02:32,822 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:02:32,822 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 164 interpolants. [2022-11-23 15:02:32,823 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=723, Invalid=27669, Unknown=0, NotChecked=0, Total=28392 [2022-11-23 15:02:32,824 INFO L87 Difference]: Start difference. First operand 75 states and 79 transitions. Second operand has 164 states, 164 states have (on average 1.0670731707317074) internal successors, (175), 164 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) [2022-11-23 15:03:00,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:03:00,159 INFO L93 Difference]: Finished difference Result 121 states and 128 transitions. [2022-11-23 15:03:00,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2022-11-23 15:03:00,159 INFO L78 Accepts]: Start accepts. Automaton has has 164 states, 164 states have (on average 1.0670731707317074) internal successors, (175), 164 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) Word has length 74 [2022-11-23 15:03:00,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:03:00,160 INFO L225 Difference]: With dead ends: 121 [2022-11-23 15:03:00,160 INFO L226 Difference]: Without dead ends: 118 [2022-11-23 15:03:00,162 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 335 GetRequests, 86 SyntacticMatches, 40 SemanticMatches, 209 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13326 ImplicationChecksByTransitivity, 59.8s TimeCoverageRelationStatistics Valid=1468, Invalid=42842, Unknown=0, NotChecked=0, Total=44310 [2022-11-23 15:03:00,162 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 28 mSDsluCounter, 192 mSDsCounter, 0 mSdLazyCounter, 7364 mSolverCounterSat, 136 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 195 SdHoareTripleChecker+Invalid, 7500 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 136 IncrementalHoareTripleChecker+Valid, 7364 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.7s IncrementalHoareTripleChecker+Time [2022-11-23 15:03:00,163 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 195 Invalid, 7500 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [136 Valid, 7364 Invalid, 0 Unknown, 0 Unchecked, 10.7s Time] [2022-11-23 15:03:00,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2022-11-23 15:03:00,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 105. [2022-11-23 15:03:00,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 104 states have (on average 1.0769230769230769) internal successors, (112), 104 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:03:00,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 112 transitions. [2022-11-23 15:03:00,217 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 112 transitions. Word has length 74 [2022-11-23 15:03:00,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:03:00,218 INFO L495 AbstractCegarLoop]: Abstraction has 105 states and 112 transitions. [2022-11-23 15:03:00,218 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 164 states, 164 states have (on average 1.0670731707317074) internal successors, (175), 164 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) [2022-11-23 15:03:00,218 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 112 transitions. [2022-11-23 15:03:00,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2022-11-23 15:03:00,219 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:03:00,219 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:03:00,226 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2022-11-23 15:03:00,426 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2022-11-23 15:03:00,426 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:03:00,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:03:00,426 INFO L85 PathProgramCache]: Analyzing trace with hash 2078588577, now seen corresponding path program 37 times [2022-11-23 15:03:00,426 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:03:00,427 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1824984380] [2022-11-23 15:03:00,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:03:00,427 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:03:00,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:03:00,952 INFO L134 CoverageAnalysis]: Checked inductivity of 469 backedges. 92 proven. 104 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2022-11-23 15:03:00,952 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:03:00,953 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1824984380] [2022-11-23 15:03:00,953 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1824984380] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:03:00,953 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [844232206] [2022-11-23 15:03:00,953 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 15:03:00,953 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:03:00,953 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:03:00,954 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:03:00,956 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-11-23 15:03:01,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:03:01,137 INFO L263 TraceCheckSpWp]: Trace formula consists of 446 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-23 15:03:01,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:03:01,577 INFO L134 CoverageAnalysis]: Checked inductivity of 469 backedges. 105 proven. 91 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2022-11-23 15:03:01,577 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:03:01,973 INFO L134 CoverageAnalysis]: Checked inductivity of 469 backedges. 105 proven. 91 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2022-11-23 15:03:01,974 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [844232206] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:03:01,974 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1279697457] [2022-11-23 15:03:01,975 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 15:03:01,975 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:03:01,975 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:03:01,975 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:03:01,975 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:03:01,990 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:03:02,018 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 15:03:02,018 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 15:03:02,029 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:03:02,030 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-23 15:03:02,051 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:03:02,052 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-23 15:03:02,100 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:03:02,103 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:03:02,116 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 15:03:02,116 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-11-23 15:03:02,157 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 15:03:02,243 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:03:03,206 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23290#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 15:03:03,206 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:03:03,206 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:03:03,206 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 46 [2022-11-23 15:03:03,206 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1563958204] [2022-11-23 15:03:03,207 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:03:03,207 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-11-23 15:03:03,207 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:03:03,207 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-11-23 15:03:03,208 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=524, Invalid=2026, Unknown=0, NotChecked=0, Total=2550 [2022-11-23 15:03:03,208 INFO L87 Difference]: Start difference. First operand 105 states and 112 transitions. Second operand has 46 states, 46 states have (on average 1.2608695652173914) internal successors, (58), 46 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:03:03,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:03:03,949 INFO L93 Difference]: Finished difference Result 208 states and 222 transitions. [2022-11-23 15:03:03,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-11-23 15:03:03,950 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.2608695652173914) internal successors, (58), 46 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 75 [2022-11-23 15:03:03,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:03:03,950 INFO L225 Difference]: With dead ends: 208 [2022-11-23 15:03:03,950 INFO L226 Difference]: Without dead ends: 106 [2022-11-23 15:03:03,951 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 163 SyntacticMatches, 41 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2131 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=855, Invalid=3305, Unknown=0, NotChecked=0, Total=4160 [2022-11-23 15:03:03,951 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 20 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 622 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 709 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 622 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 15:03:03,952 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 21 Invalid, 709 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 622 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 15:03:03,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2022-11-23 15:03:04,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2022-11-23 15:03:04,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 105 states have (on average 1.0761904761904761) internal successors, (113), 105 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:03:04,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 113 transitions. [2022-11-23 15:03:04,005 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 113 transitions. Word has length 75 [2022-11-23 15:03:04,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:03:04,006 INFO L495 AbstractCegarLoop]: Abstraction has 106 states and 113 transitions. [2022-11-23 15:03:04,006 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 1.2608695652173914) internal successors, (58), 46 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:03:04,006 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 113 transitions. [2022-11-23 15:03:04,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-11-23 15:03:04,007 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:03:04,007 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:03:04,017 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2022-11-23 15:03:04,213 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2022-11-23 15:03:04,213 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:03:04,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:03:04,213 INFO L85 PathProgramCache]: Analyzing trace with hash 620586988, now seen corresponding path program 38 times [2022-11-23 15:03:04,213 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:03:04,214 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1753148768] [2022-11-23 15:03:04,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:03:04,214 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:03:04,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:03:04,744 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 78 proven. 118 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2022-11-23 15:03:04,744 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:03:04,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1753148768] [2022-11-23 15:03:04,744 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1753148768] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:03:04,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1629218653] [2022-11-23 15:03:04,744 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 15:03:04,744 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:03:04,745 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:03:04,745 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:03:04,751 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-11-23 15:03:05,085 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2022-11-23 15:03:05,086 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:03:05,091 INFO L263 TraceCheckSpWp]: Trace formula consists of 455 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-23 15:03:05,093 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:03:05,804 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 91 proven. 105 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2022-11-23 15:03:05,805 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:03:06,367 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 91 proven. 105 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2022-11-23 15:03:06,368 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1629218653] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:03:06,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1992263222] [2022-11-23 15:03:06,369 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 15:03:06,369 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:03:06,369 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:03:06,369 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:03:06,369 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:03:06,380 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:03:06,403 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-23 15:03:06,403 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-23 15:03:06,414 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:03:06,439 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 15:03:06,439 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 15:03:06,460 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:03:06,461 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-23 15:03:06,498 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:03:06,500 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:03:06,513 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 15:03:06,513 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-11-23 15:03:06,586 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 15:03:06,670 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:03:07,980 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24448#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 15:03:07,981 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:03:07,981 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:03:07,981 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 60 [2022-11-23 15:03:07,981 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1929757080] [2022-11-23 15:03:07,981 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:03:07,981 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2022-11-23 15:03:07,982 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:03:07,982 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2022-11-23 15:03:07,982 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=638, Invalid=3522, Unknown=0, NotChecked=0, Total=4160 [2022-11-23 15:03:07,982 INFO L87 Difference]: Start difference. First operand 106 states and 113 transitions. Second operand has 60 states, 60 states have (on average 1.5) internal successors, (90), 60 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) [2022-11-23 15:03:08,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:03:08,729 INFO L93 Difference]: Finished difference Result 141 states and 153 transitions. [2022-11-23 15:03:08,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-11-23 15:03:08,730 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 1.5) internal successors, (90), 60 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 76 [2022-11-23 15:03:08,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:03:08,730 INFO L225 Difference]: With dead ends: 141 [2022-11-23 15:03:08,731 INFO L226 Difference]: Without dead ends: 80 [2022-11-23 15:03:08,731 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 138 SyntacticMatches, 56 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5399 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=1240, Invalid=5240, Unknown=0, NotChecked=0, Total=6480 [2022-11-23 15:03:08,732 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 359 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 779 mSolverCounterSat, 260 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 359 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 1039 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 260 IncrementalHoareTripleChecker+Valid, 779 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-23 15:03:08,732 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [359 Valid, 21 Invalid, 1039 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [260 Valid, 779 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-23 15:03:08,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2022-11-23 15:03:08,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 80. [2022-11-23 15:03:08,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.0632911392405062) internal successors, (84), 79 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:03:08,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 84 transitions. [2022-11-23 15:03:08,770 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 84 transitions. Word has length 76 [2022-11-23 15:03:08,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:03:08,770 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 84 transitions. [2022-11-23 15:03:08,770 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 1.5) internal successors, (90), 60 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) [2022-11-23 15:03:08,771 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 84 transitions. [2022-11-23 15:03:08,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-11-23 15:03:08,771 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:03:08,771 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:03:08,781 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2022-11-23 15:03:08,972 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:03:08,972 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:03:08,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:03:08,972 INFO L85 PathProgramCache]: Analyzing trace with hash -1073466714, now seen corresponding path program 39 times [2022-11-23 15:03:08,973 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:03:08,973 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1067977409] [2022-11-23 15:03:08,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:03:08,973 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:03:09,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:03:28,397 INFO L134 CoverageAnalysis]: Checked inductivity of 525 backedges. 1 proven. 524 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 15:03:28,397 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:03:28,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1067977409] [2022-11-23 15:03:28,398 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1067977409] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:03:28,398 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1396859362] [2022-11-23 15:03:28,398 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 15:03:28,398 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:03:28,398 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:03:28,399 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:03:28,401 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-11-23 15:03:28,599 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 15:03:28,600 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:03:28,605 WARN L261 TraceCheckSpWp]: Trace formula consists of 470 conjuncts, 266 conjunts are in the unsatisfiable core [2022-11-23 15:03:28,610 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:03:28,993 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-23 15:03:42,006 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 15:03:42,008 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 15:03:42,008 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 14 [2022-11-23 15:03:42,345 INFO L134 CoverageAnalysis]: Checked inductivity of 525 backedges. 0 proven. 525 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 15:03:42,345 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:04:10,929 INFO L134 CoverageAnalysis]: Checked inductivity of 525 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2022-11-23 15:04:10,929 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1396859362] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:04:10,930 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1737185365] [2022-11-23 15:04:10,931 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 15:04:10,931 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:04:10,931 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:04:10,931 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:04:10,931 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:04:10,944 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:04:10,979 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 15:04:10,979 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 15:04:10,989 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:04:10,991 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-23 15:04:11,010 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:04:11,011 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-23 15:04:11,063 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:04:11,064 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 15:04:11,090 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 15:04:11,090 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-11-23 15:04:11,162 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 15:04:11,253 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:04:18,779 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '25558#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 15:04:18,779 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:04:18,779 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:04:18,779 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [78, 76, 62] total 176 [2022-11-23 15:04:18,779 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1609756150] [2022-11-23 15:04:18,779 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:04:18,780 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 176 states [2022-11-23 15:04:18,780 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:04:18,780 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 176 interpolants. [2022-11-23 15:04:18,782 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=704, Invalid=31876, Unknown=0, NotChecked=0, Total=32580 [2022-11-23 15:04:18,783 INFO L87 Difference]: Start difference. First operand 80 states and 84 transitions. Second operand has 176 states, 176 states have (on average 1.0625) internal successors, (187), 176 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) [2022-11-23 15:04:52,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:04:52,151 INFO L93 Difference]: Finished difference Result 129 states and 136 transitions. [2022-11-23 15:04:52,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2022-11-23 15:04:52,151 INFO L78 Accepts]: Start accepts. Automaton has has 176 states, 176 states have (on average 1.0625) internal successors, (187), 176 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) Word has length 79 [2022-11-23 15:04:52,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:04:52,152 INFO L225 Difference]: With dead ends: 129 [2022-11-23 15:04:52,152 INFO L226 Difference]: Without dead ends: 126 [2022-11-23 15:04:52,154 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 358 GetRequests, 92 SyntacticMatches, 42 SemanticMatches, 224 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12354 ImplicationChecksByTransitivity, 76.6s TimeCoverageRelationStatistics Valid=1543, Invalid=49307, Unknown=0, NotChecked=0, Total=50850 [2022-11-23 15:04:52,154 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 24 mSDsluCounter, 204 mSDsCounter, 0 mSdLazyCounter, 8544 mSolverCounterSat, 199 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 207 SdHoareTripleChecker+Invalid, 8743 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 199 IncrementalHoareTripleChecker+Valid, 8544 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.6s IncrementalHoareTripleChecker+Time [2022-11-23 15:04:52,155 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 207 Invalid, 8743 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [199 Valid, 8544 Invalid, 0 Unknown, 0 Unchecked, 12.6s Time] [2022-11-23 15:04:52,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2022-11-23 15:04:52,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 112. [2022-11-23 15:04:52,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 111 states have (on average 1.072072072072072) internal successors, (119), 111 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:04:52,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 119 transitions. [2022-11-23 15:04:52,212 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 119 transitions. Word has length 79 [2022-11-23 15:04:52,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:04:52,212 INFO L495 AbstractCegarLoop]: Abstraction has 112 states and 119 transitions. [2022-11-23 15:04:52,213 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 176 states, 176 states have (on average 1.0625) internal successors, (187), 176 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) [2022-11-23 15:04:52,213 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 119 transitions. [2022-11-23 15:04:52,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2022-11-23 15:04:52,213 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:04:52,213 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:04:52,219 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2022-11-23 15:04:52,414 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:04:52,414 INFO L420 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:04:52,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:04:52,414 INFO L85 PathProgramCache]: Analyzing trace with hash 1135492928, now seen corresponding path program 40 times [2022-11-23 15:04:52,414 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:04:52,414 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [466424040] [2022-11-23 15:04:52,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:04:52,415 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:04:52,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:04:52,982 INFO L134 CoverageAnalysis]: Checked inductivity of 540 backedges. 106 proven. 119 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2022-11-23 15:04:52,983 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:04:52,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [466424040] [2022-11-23 15:04:52,983 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [466424040] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:04:52,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [967709383] [2022-11-23 15:04:52,983 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 15:04:52,984 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:04:52,984 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:04:52,985 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:04:52,997 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2022-11-23 15:04:53,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:04:53,191 INFO L263 TraceCheckSpWp]: Trace formula consists of 475 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-23 15:04:53,193 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:04:53,672 INFO L134 CoverageAnalysis]: Checked inductivity of 540 backedges. 120 proven. 105 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2022-11-23 15:04:53,672 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:04:54,115 INFO L134 CoverageAnalysis]: Checked inductivity of 540 backedges. 120 proven. 105 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2022-11-23 15:04:54,115 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [967709383] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:04:54,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [385367546] [2022-11-23 15:04:54,117 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 15:04:54,117 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:04:54,117 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:04:54,117 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:04:54,117 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:04:54,132 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:04:54,158 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-23 15:04:54,158 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-23 15:04:54,170 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:04:54,198 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 15:04:54,198 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 15:04:54,252 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:04:54,253 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-23 15:04:54,290 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:04:54,292 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:04:54,305 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 15:04:54,305 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-11-23 15:04:54,342 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 15:04:54,423 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:04:55,940 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26645#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 15:04:55,940 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:04:55,941 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:04:55,941 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 49 [2022-11-23 15:04:55,941 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2062954718] [2022-11-23 15:04:55,941 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:04:55,941 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-11-23 15:04:55,942 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:04:55,942 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-11-23 15:04:55,942 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=590, Invalid=2272, Unknown=0, NotChecked=0, Total=2862 [2022-11-23 15:04:55,943 INFO L87 Difference]: Start difference. First operand 112 states and 119 transitions. Second operand has 49 states, 49 states have (on average 1.2448979591836735) internal successors, (61), 49 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:04:56,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:04:56,755 INFO L93 Difference]: Finished difference Result 222 states and 236 transitions. [2022-11-23 15:04:56,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-11-23 15:04:56,755 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.2448979591836735) internal successors, (61), 49 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 80 [2022-11-23 15:04:56,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:04:56,756 INFO L225 Difference]: With dead ends: 222 [2022-11-23 15:04:56,756 INFO L226 Difference]: Without dead ends: 113 [2022-11-23 15:04:56,757 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 159 SyntacticMatches, 59 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3109 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=967, Invalid=3725, Unknown=0, NotChecked=0, Total=4692 [2022-11-23 15:04:56,758 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 22 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 590 mSolverCounterSat, 88 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 678 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 88 IncrementalHoareTripleChecker+Valid, 590 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 15:04:56,758 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 15 Invalid, 678 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [88 Valid, 590 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 15:04:56,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2022-11-23 15:04:56,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 113. [2022-11-23 15:04:56,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 112 states have (on average 1.0714285714285714) internal successors, (120), 112 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) [2022-11-23 15:04:56,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 120 transitions. [2022-11-23 15:04:56,849 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 120 transitions. Word has length 80 [2022-11-23 15:04:56,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:04:56,849 INFO L495 AbstractCegarLoop]: Abstraction has 113 states and 120 transitions. [2022-11-23 15:04:56,850 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.2448979591836735) internal successors, (61), 49 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:04:56,850 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 120 transitions. [2022-11-23 15:04:56,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2022-11-23 15:04:56,850 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:04:56,850 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:04:56,862 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2022-11-23 15:04:57,057 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:04:57,058 INFO L420 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:04:57,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:04:57,058 INFO L85 PathProgramCache]: Analyzing trace with hash 1821551829, now seen corresponding path program 41 times [2022-11-23 15:04:57,058 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:04:57,059 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1814422494] [2022-11-23 15:04:57,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:04:57,059 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:04:57,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:04:57,720 INFO L134 CoverageAnalysis]: Checked inductivity of 555 backedges. 91 proven. 134 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2022-11-23 15:04:57,720 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:04:57,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1814422494] [2022-11-23 15:04:57,720 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1814422494] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:04:57,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1854693646] [2022-11-23 15:04:57,721 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 15:04:57,721 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:04:57,721 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:04:57,723 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:04:57,725 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-11-23 15:04:58,231 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-11-23 15:04:58,231 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:04:58,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 484 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-23 15:04:58,237 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:04:58,662 INFO L134 CoverageAnalysis]: Checked inductivity of 555 backedges. 105 proven. 120 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2022-11-23 15:04:58,663 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:04:59,114 INFO L134 CoverageAnalysis]: Checked inductivity of 555 backedges. 105 proven. 120 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2022-11-23 15:04:59,115 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1854693646] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:04:59,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1800502660] [2022-11-23 15:04:59,116 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 15:04:59,116 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:04:59,116 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:04:59,116 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:04:59,117 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:04:59,128 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:04:59,153 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 15:04:59,153 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 15:04:59,162 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:04:59,163 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-23 15:04:59,191 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:04:59,191 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-23 15:04:59,231 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:04:59,234 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:04:59,247 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 15:04:59,248 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-11-23 15:04:59,293 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 15:04:59,362 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:04:59,630 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '27867#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 15:04:59,630 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:04:59,630 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:04:59,630 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 50 [2022-11-23 15:04:59,630 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2083586542] [2022-11-23 15:04:59,630 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:04:59,631 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-11-23 15:04:59,631 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:04:59,632 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-11-23 15:04:59,632 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=599, Invalid=2371, Unknown=0, NotChecked=0, Total=2970 [2022-11-23 15:04:59,632 INFO L87 Difference]: Start difference. First operand 113 states and 120 transitions. Second operand has 50 states, 50 states have (on average 1.58) internal successors, (79), 50 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:05:00,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:05:00,219 INFO L93 Difference]: Finished difference Result 150 states and 162 transitions. [2022-11-23 15:05:00,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-11-23 15:05:00,220 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 1.58) internal successors, (79), 50 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 81 [2022-11-23 15:05:00,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:05:00,220 INFO L225 Difference]: With dead ends: 150 [2022-11-23 15:05:00,220 INFO L226 Difference]: Without dead ends: 85 [2022-11-23 15:05:00,221 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 191 SyntacticMatches, 30 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2358 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1248, Invalid=3722, Unknown=0, NotChecked=0, Total=4970 [2022-11-23 15:05:00,221 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 303 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 244 mSolverCounterSat, 254 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 303 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 498 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 254 IncrementalHoareTripleChecker+Valid, 244 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 15:05:00,222 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [303 Valid, 11 Invalid, 498 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [254 Valid, 244 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 15:05:00,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2022-11-23 15:05:00,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2022-11-23 15:05:00,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.0595238095238095) internal successors, (89), 84 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:05:00,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 89 transitions. [2022-11-23 15:05:00,291 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 89 transitions. Word has length 81 [2022-11-23 15:05:00,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:05:00,292 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 89 transitions. [2022-11-23 15:05:00,292 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 1.58) internal successors, (79), 50 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:05:00,292 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 89 transitions. [2022-11-23 15:05:00,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2022-11-23 15:05:00,293 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:05:00,293 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:05:00,301 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2022-11-23 15:05:00,500 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:05:00,501 INFO L420 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:05:00,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:05:00,501 INFO L85 PathProgramCache]: Analyzing trace with hash -1571638371, now seen corresponding path program 42 times [2022-11-23 15:05:00,501 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:05:00,501 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [374919090] [2022-11-23 15:05:00,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:05:00,502 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:05:00,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:05:23,698 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 6 proven. 594 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 15:05:23,698 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:05:23,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [374919090] [2022-11-23 15:05:23,699 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [374919090] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:05:23,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1277236582] [2022-11-23 15:05:23,699 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 15:05:23,699 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:05:23,699 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:05:23,700 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:05:23,702 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2022-11-23 15:05:23,919 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 15:05:23,919 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:05:23,925 WARN L261 TraceCheckSpWp]: Trace formula consists of 499 conjuncts, 282 conjunts are in the unsatisfiable core [2022-11-23 15:05:23,928 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:05:24,600 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-23 15:05:40,066 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 15:05:40,066 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:06:14,113 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 480 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2022-11-23 15:06:14,114 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1277236582] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:06:14,114 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2051828027] [2022-11-23 15:06:14,115 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 15:06:14,115 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:06:14,115 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:06:14,115 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:06:14,115 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:06:14,126 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:06:14,151 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 15:06:14,152 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 15:06:14,160 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:06:14,161 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-23 15:06:14,177 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:06:14,178 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-23 15:06:14,220 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:06:14,221 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 15:06:14,247 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 15:06:14,248 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-11-23 15:06:14,325 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 15:06:14,411 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:06:33,614 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '29048#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 15:06:33,614 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:06:33,614 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:06:33,615 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [83, 81, 66] total 189 [2022-11-23 15:06:33,615 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1243938462] [2022-11-23 15:06:33,615 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:06:33,616 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 189 states [2022-11-23 15:06:33,616 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:06:33,616 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 189 interpolants. [2022-11-23 15:06:33,617 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=779, Invalid=36663, Unknown=0, NotChecked=0, Total=37442 [2022-11-23 15:06:33,618 INFO L87 Difference]: Start difference. First operand 85 states and 89 transitions. Second operand has 189 states, 189 states have (on average 1.0582010582010581) internal successors, (200), 189 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) [2022-11-23 15:07:12,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:07:12,705 INFO L93 Difference]: Finished difference Result 137 states and 144 transitions. [2022-11-23 15:07:12,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2022-11-23 15:07:12,705 INFO L78 Accepts]: Start accepts. Automaton has has 189 states, 189 states have (on average 1.0582010582010581) internal successors, (200), 189 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) Word has length 84 [2022-11-23 15:07:12,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:07:12,705 INFO L225 Difference]: With dead ends: 137 [2022-11-23 15:07:12,706 INFO L226 Difference]: Without dead ends: 134 [2022-11-23 15:07:12,707 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 381 GetRequests, 65 SyntacticMatches, 76 SemanticMatches, 240 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18610 ImplicationChecksByTransitivity, 100.7s TimeCoverageRelationStatistics Valid=1729, Invalid=56593, Unknown=0, NotChecked=0, Total=58322 [2022-11-23 15:07:12,708 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 29 mSDsluCounter, 222 mSDsCounter, 0 mSdLazyCounter, 9698 mSolverCounterSat, 162 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 13.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 225 SdHoareTripleChecker+Invalid, 9860 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 162 IncrementalHoareTripleChecker+Valid, 9698 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 15.0s IncrementalHoareTripleChecker+Time [2022-11-23 15:07:12,708 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 225 Invalid, 9860 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [162 Valid, 9698 Invalid, 0 Unknown, 0 Unchecked, 15.0s Time] [2022-11-23 15:07:12,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2022-11-23 15:07:12,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 119. [2022-11-23 15:07:12,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 118 states have (on average 1.0677966101694916) internal successors, (126), 118 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:07:12,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 126 transitions. [2022-11-23 15:07:12,795 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 126 transitions. Word has length 84 [2022-11-23 15:07:12,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:07:12,796 INFO L495 AbstractCegarLoop]: Abstraction has 119 states and 126 transitions. [2022-11-23 15:07:12,796 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 189 states, 189 states have (on average 1.0582010582010581) internal successors, (200), 189 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) [2022-11-23 15:07:12,796 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 126 transitions. [2022-11-23 15:07:12,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-11-23 15:07:12,796 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:07:12,796 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:07:12,802 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2022-11-23 15:07:12,997 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2022-11-23 15:07:12,997 INFO L420 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:07:12,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:07:12,997 INFO L85 PathProgramCache]: Analyzing trace with hash 1665028097, now seen corresponding path program 43 times [2022-11-23 15:07:12,997 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:07:12,997 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [764224615] [2022-11-23 15:07:12,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:07:12,998 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:07:13,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:07:13,741 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 121 proven. 135 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2022-11-23 15:07:13,741 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:07:13,741 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [764224615] [2022-11-23 15:07:13,741 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [764224615] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:07:13,741 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [153919521] [2022-11-23 15:07:13,741 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 15:07:13,741 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:07:13,742 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:07:13,742 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:07:13,747 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2022-11-23 15:07:13,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:07:13,952 INFO L263 TraceCheckSpWp]: Trace formula consists of 504 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-23 15:07:13,954 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:07:14,494 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 136 proven. 120 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2022-11-23 15:07:14,495 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:07:14,960 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 136 proven. 120 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2022-11-23 15:07:14,960 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [153919521] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:07:14,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1251223839] [2022-11-23 15:07:14,961 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 15:07:14,961 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:07:14,961 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:07:14,961 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:07:14,961 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:07:14,973 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:07:14,998 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 15:07:14,998 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 15:07:15,007 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:07:15,007 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-23 15:07:15,027 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:07:15,028 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-23 15:07:15,067 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:07:15,069 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:07:15,082 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-23 15:07:15,082 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2022-11-23 15:07:15,118 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 15:07:15,205 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:07:16,821 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30204#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 15:07:16,821 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:07:16,821 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:07:16,822 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 52 [2022-11-23 15:07:16,822 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1626754162] [2022-11-23 15:07:16,822 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:07:16,822 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-11-23 15:07:16,822 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:07:16,822 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-11-23 15:07:16,823 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=660, Invalid=2532, Unknown=0, NotChecked=0, Total=3192 [2022-11-23 15:07:16,823 INFO L87 Difference]: Start difference. First operand 119 states and 126 transitions. Second operand has 52 states, 52 states have (on average 1.2307692307692308) internal successors, (64), 52 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:07:17,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:07:17,695 INFO L93 Difference]: Finished difference Result 236 states and 250 transitions. [2022-11-23 15:07:17,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-11-23 15:07:17,695 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 1.2307692307692308) internal successors, (64), 52 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 85 [2022-11-23 15:07:17,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:07:17,696 INFO L225 Difference]: With dead ends: 236 [2022-11-23 15:07:17,696 INFO L226 Difference]: Without dead ends: 120 [2022-11-23 15:07:17,697 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 303 GetRequests, 169 SyntacticMatches, 63 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3509 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=1086, Invalid=4170, Unknown=0, NotChecked=0, Total=5256 [2022-11-23 15:07:17,698 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 20 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 720 mSolverCounterSat, 94 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 814 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 720 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 15:07:17,698 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 15 Invalid, 814 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [94 Valid, 720 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 15:07:17,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2022-11-23 15:07:17,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 120. [2022-11-23 15:07:17,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 119 states have (on average 1.0672268907563025) internal successors, (127), 119 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) [2022-11-23 15:07:17,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 127 transitions. [2022-11-23 15:07:17,771 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 127 transitions. Word has length 85 [2022-11-23 15:07:17,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:07:17,772 INFO L495 AbstractCegarLoop]: Abstraction has 120 states and 127 transitions. [2022-11-23 15:07:17,772 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 1.2307692307692308) internal successors, (64), 52 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:07:17,772 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 127 transitions. [2022-11-23 15:07:17,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2022-11-23 15:07:17,772 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:07:17,772 INFO L195 NwaCegarLoop]: trace histogram [16, 16, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:07:17,778 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2022-11-23 15:07:17,973 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:07:17,973 INFO L420 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:07:17,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:07:17,973 INFO L85 PathProgramCache]: Analyzing trace with hash 660084620, now seen corresponding path program 44 times [2022-11-23 15:07:17,973 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:07:17,973 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [118525735] [2022-11-23 15:07:17,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:07:17,974 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:07:17,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:07:18,681 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 105 proven. 151 refuted. 0 times theorem prover too weak. 376 trivial. 0 not checked. [2022-11-23 15:07:18,681 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:07:18,682 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [118525735] [2022-11-23 15:07:18,682 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [118525735] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:07:18,682 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1837954849] [2022-11-23 15:07:18,682 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 15:07:18,682 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:07:18,682 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:07:18,683 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:07:18,685 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2022-11-23 15:07:19,312 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-11-23 15:07:19,312 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:07:19,316 INFO L263 TraceCheckSpWp]: Trace formula consists of 513 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-23 15:07:19,317 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:07:19,745 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 120 proven. 136 refuted. 0 times theorem prover too weak. 376 trivial. 0 not checked. [2022-11-23 15:07:19,745 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:07:20,210 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 120 proven. 136 refuted. 0 times theorem prover too weak. 376 trivial. 0 not checked. [2022-11-23 15:07:20,210 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1837954849] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:07:20,210 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [836912826] [2022-11-23 15:07:20,211 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-23 15:07:20,211 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:07:20,211 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:07:20,212 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:07:20,212 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:07:20,229 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:07:20,260 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-23 15:07:20,260 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-23 15:07:20,271 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:07:20,272 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-23 15:07:20,291 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:07:20,292 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-23 15:07:20,331 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 15:07:20,332 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 15:07:20,355 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-23 15:07:20,355 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2022-11-23 15:07:20,421 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-23 15:07:20,506 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:07:21,765 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '31503#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 15:07:21,765 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:07:21,765 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:07:21,766 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 53 [2022-11-23 15:07:21,766 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1763428586] [2022-11-23 15:07:21,766 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:07:21,766 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2022-11-23 15:07:21,766 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:07:21,766 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2022-11-23 15:07:21,767 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=669, Invalid=2637, Unknown=0, NotChecked=0, Total=3306 [2022-11-23 15:07:21,767 INFO L87 Difference]: Start difference. First operand 120 states and 127 transitions. Second operand has 53 states, 53 states have (on average 1.2075471698113207) internal successors, (64), 53 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:07:22,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:07:22,458 INFO L93 Difference]: Finished difference Result 159 states and 171 transitions. [2022-11-23 15:07:22,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-11-23 15:07:22,458 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.2075471698113207) internal successors, (64), 53 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 86 [2022-11-23 15:07:22,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:07:22,459 INFO L225 Difference]: With dead ends: 159 [2022-11-23 15:07:22,459 INFO L226 Difference]: Without dead ends: 90 [2022-11-23 15:07:22,460 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 308 GetRequests, 171 SyntacticMatches, 64 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4732 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1401, Invalid=4149, Unknown=0, NotChecked=0, Total=5550 [2022-11-23 15:07:22,460 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 249 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 310 mSolverCounterSat, 203 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 249 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 513 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 203 IncrementalHoareTripleChecker+Valid, 310 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 15:07:22,460 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [249 Valid, 15 Invalid, 513 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [203 Valid, 310 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 15:07:22,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2022-11-23 15:07:22,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2022-11-23 15:07:22,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 89 states have (on average 1.0561797752808988) internal successors, (94), 89 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:07:22,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 94 transitions. [2022-11-23 15:07:22,531 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 94 transitions. Word has length 86 [2022-11-23 15:07:22,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:07:22,531 INFO L495 AbstractCegarLoop]: Abstraction has 90 states and 94 transitions. [2022-11-23 15:07:22,531 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 1.2075471698113207) internal successors, (64), 53 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 15:07:22,531 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 94 transitions. [2022-11-23 15:07:22,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2022-11-23 15:07:22,532 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:07:22,532 INFO L195 NwaCegarLoop]: trace histogram [16, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:07:22,539 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2022-11-23 15:07:22,732 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2022-11-23 15:07:22,733 INFO L420 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:07:22,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:07:22,733 INFO L85 PathProgramCache]: Analyzing trace with hash -127838586, now seen corresponding path program 45 times [2022-11-23 15:07:22,733 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:07:22,733 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [408084553] [2022-11-23 15:07:22,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:07:22,733 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:07:23,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:07:50,190 INFO L134 CoverageAnalysis]: Checked inductivity of 680 backedges. 4 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 15:07:50,190 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:07:50,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [408084553] [2022-11-23 15:07:50,190 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [408084553] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:07:50,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2122338521] [2022-11-23 15:07:50,191 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 15:07:50,191 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:07:50,191 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:07:50,192 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:07:50,194 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee47c759-b48c-4bed-9ade-592d5cde32ee/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2022-11-23 15:07:50,427 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 15:07:50,427 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:07:50,433 WARN L261 TraceCheckSpWp]: Trace formula consists of 528 conjuncts, 302 conjunts are in the unsatisfiable core [2022-11-23 15:07:50,436 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:07:51,296 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-23 15:08:09,835 INFO L134 CoverageAnalysis]: Checked inductivity of 680 backedges. 0 proven. 680 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 15:08:09,835 INFO L328 TraceCheckSpWp]: Computing backward predicates...