./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/openbsd_cstrstr-alloca-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/openbsd_cstrstr-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 991fb09b573d5827d0db553f1ea89a581f5a664ba8b68d6f14a043df738f2f6d --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 01:50:37,014 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 01:50:37,017 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 01:50:37,058 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 01:50:37,059 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 01:50:37,060 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 01:50:37,063 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 01:50:37,066 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 01:50:37,069 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 01:50:37,071 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 01:50:37,073 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 01:50:37,075 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 01:50:37,075 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 01:50:37,077 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 01:50:37,079 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 01:50:37,082 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 01:50:37,083 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 01:50:37,085 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 01:50:37,088 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 01:50:37,091 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 01:50:37,094 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 01:50:37,096 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 01:50:37,098 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 01:50:37,100 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 01:50:37,105 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 01:50:37,106 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 01:50:37,106 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 01:50:37,108 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 01:50:37,109 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 01:50:37,110 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 01:50:37,111 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 01:50:37,112 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 01:50:37,113 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 01:50:37,115 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 01:50:37,117 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 01:50:37,117 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 01:50:37,118 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 01:50:37,119 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 01:50:37,120 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 01:50:37,121 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 01:50:37,122 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 01:50:37,124 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2021-11-21 01:50:37,159 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 01:50:37,163 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 01:50:37,166 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 01:50:37,167 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 01:50:37,168 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 01:50:37,169 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 01:50:37,170 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 01:50:37,171 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 01:50:37,172 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 01:50:37,172 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 01:50:37,174 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 01:50:37,174 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 01:50:37,174 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 01:50:37,175 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 01:50:37,175 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 01:50:37,176 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 01:50:37,176 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 01:50:37,176 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 01:50:37,177 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-21 01:50:37,178 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-21 01:50:37,178 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 01:50:37,178 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 01:50:37,179 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-21 01:50:37,181 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 01:50:37,181 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 01:50:37,182 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 01:50:37,182 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-21 01:50:37,182 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-21 01:50:37,182 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-21 01:50:37,183 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 01:50:37,183 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-21 01:50:37,184 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 01:50:37,184 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 01:50:37,184 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 01:50:37,185 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 01:50:37,185 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:50:37,185 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 01:50:37,186 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 01:50:37,186 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 01:50:37,186 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 01:50:37,186 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 01:50:37,187 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 01:50:37,187 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES 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_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 991fb09b573d5827d0db553f1ea89a581f5a664ba8b68d6f14a043df738f2f6d [2021-11-21 01:50:37,494 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 01:50:37,525 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 01:50:37,528 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 01:50:37,529 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 01:50:37,531 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 01:50:37,533 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/array-memsafety/openbsd_cstrstr-alloca-2.i [2021-11-21 01:50:37,653 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/data/8b2737206/8ad2fe8941994f9c8975ee40fe3b9c16/FLAG6ae91c0a0 [2021-11-21 01:50:38,290 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 01:50:38,291 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/sv-benchmarks/c/array-memsafety/openbsd_cstrstr-alloca-2.i [2021-11-21 01:50:38,324 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/data/8b2737206/8ad2fe8941994f9c8975ee40fe3b9c16/FLAG6ae91c0a0 [2021-11-21 01:50:38,591 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/data/8b2737206/8ad2fe8941994f9c8975ee40fe3b9c16 [2021-11-21 01:50:38,594 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 01:50:38,596 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 01:50:38,598 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 01:50:38,598 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 01:50:38,602 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 01:50:38,603 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:50:38" (1/1) ... [2021-11-21 01:50:38,604 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@46d10362 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:50:38, skipping insertion in model container [2021-11-21 01:50:38,605 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:50:38" (1/1) ... [2021-11-21 01:50:38,613 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 01:50:38,666 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 01:50:39,079 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:50:39,089 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 01:50:39,145 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:50:39,186 INFO L208 MainTranslator]: Completed translation [2021-11-21 01:50:39,187 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:50:39 WrapperNode [2021-11-21 01:50:39,187 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 01:50:39,189 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 01:50:39,190 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 01:50:39,190 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 01:50:39,200 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:50:39" (1/1) ... [2021-11-21 01:50:39,238 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:50:39" (1/1) ... [2021-11-21 01:50:39,280 INFO L137 Inliner]: procedures = 119, calls = 23, calls flagged for inlining = 5, calls inlined = 5, statements flattened = 160 [2021-11-21 01:50:39,280 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 01:50:39,282 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 01:50:39,282 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 01:50:39,282 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 01:50:39,293 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:50:39" (1/1) ... [2021-11-21 01:50:39,294 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:50:39" (1/1) ... [2021-11-21 01:50:39,299 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:50:39" (1/1) ... [2021-11-21 01:50:39,299 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:50:39" (1/1) ... [2021-11-21 01:50:39,319 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:50:39" (1/1) ... [2021-11-21 01:50:39,325 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:50:39" (1/1) ... [2021-11-21 01:50:39,339 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:50:39" (1/1) ... [2021-11-21 01:50:39,343 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 01:50:39,345 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 01:50:39,345 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 01:50:39,345 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 01:50:39,349 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:50:39" (1/1) ... [2021-11-21 01:50:39,359 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:50:39,371 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:50:39,383 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 01:50:39,386 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 01:50:39,429 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-21 01:50:39,430 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-21 01:50:39,430 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-21 01:50:39,430 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-21 01:50:39,430 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 01:50:39,431 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 01:50:39,554 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 01:50:39,556 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 01:50:39,990 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 01:50:40,125 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 01:50:40,125 INFO L301 CfgBuilder]: Removed 6 assume(true) statements. [2021-11-21 01:50:40,128 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:50:40 BoogieIcfgContainer [2021-11-21 01:50:40,129 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 01:50:40,131 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 01:50:40,131 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 01:50:40,148 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 01:50:40,148 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 01:50:38" (1/3) ... [2021-11-21 01:50:40,149 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@44967c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:50:40, skipping insertion in model container [2021-11-21 01:50:40,149 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:50:39" (2/3) ... [2021-11-21 01:50:40,150 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@44967c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:50:40, skipping insertion in model container [2021-11-21 01:50:40,161 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:50:40" (3/3) ... [2021-11-21 01:50:40,162 INFO L111 eAbstractionObserver]: Analyzing ICFG openbsd_cstrstr-alloca-2.i [2021-11-21 01:50:40,176 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 01:50:40,176 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 25 error locations. [2021-11-21 01:50:40,250 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 01:50:40,263 INFO L339 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=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, 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, mLoopAccelerationTechnique=FAST_UPR [2021-11-21 01:50:40,263 INFO L340 AbstractCegarLoop]: Starting to check reachability of 25 error locations. [2021-11-21 01:50:40,287 INFO L276 IsEmpty]: Start isEmpty. Operand has 60 states, 34 states have (on average 2.176470588235294) internal successors, (74), 59 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) [2021-11-21 01:50:40,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-11-21 01:50:40,305 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:50:40,306 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-11-21 01:50:40,307 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:50:40,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:50:40,314 INFO L85 PathProgramCache]: Analyzing trace with hash 220807, now seen corresponding path program 1 times [2021-11-21 01:50:40,326 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:50:40,326 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1368910437] [2021-11-21 01:50:40,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:40,328 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:50:40,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:40,576 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:50:40,577 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:50:40,578 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1368910437] [2021-11-21 01:50:40,579 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1368910437] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:50:40,579 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:50:40,580 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-21 01:50:40,582 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1305791302] [2021-11-21 01:50:40,583 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:50:40,588 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:50:40,589 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:50:40,635 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:50:40,636 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:50:40,640 INFO L87 Difference]: Start difference. First operand has 60 states, 34 states have (on average 2.176470588235294) internal successors, (74), 59 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) Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:50:40,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:50:40,738 INFO L93 Difference]: Finished difference Result 58 states and 68 transitions. [2021-11-21 01:50:40,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:50:40,741 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2021-11-21 01:50:40,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:50:40,752 INFO L225 Difference]: With dead ends: 58 [2021-11-21 01:50:40,753 INFO L226 Difference]: Without dead ends: 57 [2021-11-21 01:50:40,755 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:50:40,759 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 63 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:50:40,761 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 36 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:50:40,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-11-21 01:50:40,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2021-11-21 01:50:40,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 56 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:50:40,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 67 transitions. [2021-11-21 01:50:40,804 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 67 transitions. Word has length 3 [2021-11-21 01:50:40,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:50:40,805 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 67 transitions. [2021-11-21 01:50:40,805 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:50:40,806 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 67 transitions. [2021-11-21 01:50:40,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-11-21 01:50:40,806 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:50:40,807 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-11-21 01:50:40,807 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 01:50:40,807 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:50:40,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:50:40,809 INFO L85 PathProgramCache]: Analyzing trace with hash 220808, now seen corresponding path program 1 times [2021-11-21 01:50:40,809 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:50:40,809 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1099149787] [2021-11-21 01:50:40,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:40,810 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:50:40,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:40,919 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:50:40,920 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:50:40,920 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1099149787] [2021-11-21 01:50:40,921 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1099149787] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:50:40,931 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:50:40,931 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 01:50:40,932 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2038132291] [2021-11-21 01:50:40,932 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:50:40,933 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 01:50:40,934 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:50:40,935 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 01:50:40,935 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 01:50:40,935 INFO L87 Difference]: Start difference. First operand 57 states and 67 transitions. Second operand has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:50:41,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:50:41,132 INFO L93 Difference]: Finished difference Result 59 states and 69 transitions. [2021-11-21 01:50:41,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:50:41,133 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2021-11-21 01:50:41,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:50:41,136 INFO L225 Difference]: With dead ends: 59 [2021-11-21 01:50:41,136 INFO L226 Difference]: Without dead ends: 59 [2021-11-21 01:50:41,137 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:50:41,143 INFO L933 BasicCegarLoop]: 52 mSDtfsCounter, 1 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:50:41,146 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 124 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:50:41,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-11-21 01:50:41,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2021-11-21 01:50:41,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 36 states have (on average 1.9166666666666667) internal successors, (69), 58 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) [2021-11-21 01:50:41,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 69 transitions. [2021-11-21 01:50:41,171 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 69 transitions. Word has length 3 [2021-11-21 01:50:41,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:50:41,172 INFO L470 AbstractCegarLoop]: Abstraction has 59 states and 69 transitions. [2021-11-21 01:50:41,173 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:50:41,173 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 69 transitions. [2021-11-21 01:50:41,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-21 01:50:41,175 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:50:41,175 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1] [2021-11-21 01:50:41,175 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-21 01:50:41,181 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:50:41,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:50:41,182 INFO L85 PathProgramCache]: Analyzing trace with hash 212351948, now seen corresponding path program 1 times [2021-11-21 01:50:41,182 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:50:41,182 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1786185119] [2021-11-21 01:50:41,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:41,183 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:50:41,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:41,327 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:50:41,327 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:50:41,327 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1786185119] [2021-11-21 01:50:41,328 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1786185119] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:50:41,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [34829395] [2021-11-21 01:50:41,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:41,329 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:41,329 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:50:41,331 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:50:41,342 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 01:50:41,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:41,424 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-21 01:50:41,429 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:50:41,539 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 01:50:41,540 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-21 01:50:41,560 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-21 01:50:41,728 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:50:41,728 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:50:42,009 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:50:42,010 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [34829395] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:50:42,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [82181105] [2021-11-21 01:50:42,046 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2021-11-21 01:50:42,047 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:50:42,052 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:50:42,059 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:50:42,060 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:50:42,293 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:42,296 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 01:50:42,586 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 20 treesize of output 16 [2021-11-21 01:50:43,071 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 01:50:43,071 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 193 treesize of output 192 [2021-11-21 01:50:44,132 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:50:44,429 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:50:44,608 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:50:45,219 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:50:45,219 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:50:45,219 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 9 [2021-11-21 01:50:45,220 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2104551755] [2021-11-21 01:50:45,220 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:50:45,220 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-21 01:50:45,221 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:50:45,221 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-21 01:50:45,222 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2021-11-21 01:50:45,222 INFO L87 Difference]: Start difference. First operand 59 states and 69 transitions. Second 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) [2021-11-21 01:50:45,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:50:45,493 INFO L93 Difference]: Finished difference Result 58 states and 68 transitions. [2021-11-21 01:50:45,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 01:50:45,493 INFO L78 Accepts]: Start accepts. Automaton has 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) Word has length 5 [2021-11-21 01:50:45,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:50:45,495 INFO L225 Difference]: With dead ends: 58 [2021-11-21 01:50:45,495 INFO L226 Difference]: Without dead ends: 58 [2021-11-21 01:50:45,496 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=60, Invalid=180, Unknown=0, NotChecked=0, Total=240 [2021-11-21 01:50:45,497 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 129 mSDsluCounter, 160 mSDsCounter, 0 mSdLazyCounter, 155 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 129 SdHoareTripleChecker+Valid, 180 SdHoareTripleChecker+Invalid, 161 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 155 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:50:45,498 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [129 Valid, 180 Invalid, 161 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 155 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:50:45,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-11-21 01:50:45,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2021-11-21 01:50:45,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 35 states have (on average 1.9142857142857144) internal successors, (67), 56 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:50:45,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 67 transitions. [2021-11-21 01:50:45,515 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 67 transitions. Word has length 5 [2021-11-21 01:50:45,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:50:45,516 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 67 transitions. [2021-11-21 01:50:45,516 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has 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) [2021-11-21 01:50:45,516 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 67 transitions. [2021-11-21 01:50:45,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-21 01:50:45,517 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:50:45,517 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-21 01:50:45,571 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 01:50:45,741 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:45,741 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:50:45,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:50:45,742 INFO L85 PathProgramCache]: Analyzing trace with hash -2006848815, now seen corresponding path program 1 times [2021-11-21 01:50:45,742 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:50:45,742 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2131777546] [2021-11-21 01:50:45,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:45,743 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:50:45,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:45,809 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:50:45,810 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:50:45,810 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2131777546] [2021-11-21 01:50:45,810 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2131777546] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:50:45,811 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:50:45,811 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 01:50:45,811 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2054663242] [2021-11-21 01:50:45,811 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:50:45,812 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 01:50:45,812 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:50:45,813 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 01:50:45,814 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-21 01:50:45,814 INFO L87 Difference]: Start difference. First operand 57 states and 67 transitions. Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:50:45,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:50:45,876 INFO L93 Difference]: Finished difference Result 61 states and 71 transitions. [2021-11-21 01:50:45,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 01:50:45,877 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-21 01:50:45,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:50:45,882 INFO L225 Difference]: With dead ends: 61 [2021-11-21 01:50:45,882 INFO L226 Difference]: Without dead ends: 61 [2021-11-21 01:50:45,883 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-21 01:50:45,890 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 69 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:50:45,892 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 98 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:50:45,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-11-21 01:50:45,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 58. [2021-11-21 01:50:45,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 36 states have (on average 1.8888888888888888) internal successors, (68), 57 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:50:45,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 68 transitions. [2021-11-21 01:50:45,909 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 68 transitions. Word has length 6 [2021-11-21 01:50:45,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:50:45,910 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 68 transitions. [2021-11-21 01:50:45,910 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:50:45,910 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 68 transitions. [2021-11-21 01:50:45,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-21 01:50:45,912 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:50:45,918 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-21 01:50:45,918 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-21 01:50:45,918 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:50:45,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:50:45,919 INFO L85 PathProgramCache]: Analyzing trace with hash -2006853599, now seen corresponding path program 1 times [2021-11-21 01:50:45,920 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:50:45,920 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [210156021] [2021-11-21 01:50:45,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:45,921 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:50:45,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:45,971 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:50:45,971 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:50:45,971 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [210156021] [2021-11-21 01:50:45,971 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [210156021] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:50:45,972 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:50:45,972 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-21 01:50:45,972 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1043302850] [2021-11-21 01:50:45,972 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:50:45,973 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:50:45,973 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:50:45,973 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:50:45,974 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:50:45,974 INFO L87 Difference]: Start difference. First operand 58 states and 68 transitions. Second operand has 3 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:50:46,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:50:46,024 INFO L93 Difference]: Finished difference Result 56 states and 66 transitions. [2021-11-21 01:50:46,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:50:46,025 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-21 01:50:46,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:50:46,026 INFO L225 Difference]: With dead ends: 56 [2021-11-21 01:50:46,026 INFO L226 Difference]: Without dead ends: 56 [2021-11-21 01:50:46,026 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:50:46,028 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 57 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:50:46,028 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 35 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:50:46,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-11-21 01:50:46,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2021-11-21 01:50:46,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 36 states have (on average 1.8333333333333333) internal successors, (66), 55 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:50:46,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 66 transitions. [2021-11-21 01:50:46,035 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 66 transitions. Word has length 6 [2021-11-21 01:50:46,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:50:46,036 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 66 transitions. [2021-11-21 01:50:46,036 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:50:46,037 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 66 transitions. [2021-11-21 01:50:46,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-21 01:50:46,037 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:50:46,037 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-21 01:50:46,038 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-21 01:50:46,038 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:50:46,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:50:46,039 INFO L85 PathProgramCache]: Analyzing trace with hash -2006853598, now seen corresponding path program 1 times [2021-11-21 01:50:46,039 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:50:46,039 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1805157862] [2021-11-21 01:50:46,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:46,040 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:50:46,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:46,151 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:50:46,152 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:50:46,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1805157862] [2021-11-21 01:50:46,152 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1805157862] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:50:46,152 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:50:46,153 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 01:50:46,153 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2044964969] [2021-11-21 01:50:46,153 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:50:46,154 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:50:46,154 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:50:46,154 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:50:46,156 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:50:46,156 INFO L87 Difference]: Start difference. First operand 56 states and 66 transitions. Second operand has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:50:46,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:50:46,275 INFO L93 Difference]: Finished difference Result 57 states and 67 transitions. [2021-11-21 01:50:46,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 01:50:46,277 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-21 01:50:46,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:50:46,278 INFO L225 Difference]: With dead ends: 57 [2021-11-21 01:50:46,278 INFO L226 Difference]: Without dead ends: 57 [2021-11-21 01:50:46,281 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:50:46,286 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 63 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 89 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 90 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 89 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:50:46,287 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 102 Invalid, 90 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 89 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:50:46,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-11-21 01:50:46,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2021-11-21 01:50:46,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 37 states have (on average 1.8108108108108107) internal successors, (67), 56 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:50:46,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 67 transitions. [2021-11-21 01:50:46,301 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 67 transitions. Word has length 6 [2021-11-21 01:50:46,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:50:46,302 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 67 transitions. [2021-11-21 01:50:46,302 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:50:46,302 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 67 transitions. [2021-11-21 01:50:46,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-21 01:50:46,303 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:50:46,303 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:50:46,304 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-21 01:50:46,304 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:50:46,304 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:50:46,305 INFO L85 PathProgramCache]: Analyzing trace with hash -145844409, now seen corresponding path program 1 times [2021-11-21 01:50:46,306 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:50:46,306 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [882401685] [2021-11-21 01:50:46,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:46,306 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:50:46,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:46,452 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:50:46,452 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:50:46,452 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [882401685] [2021-11-21 01:50:46,452 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [882401685] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:50:46,453 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1869193850] [2021-11-21 01:50:46,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:46,453 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:46,453 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:50:46,457 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:50:46,465 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 01:50:46,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:46,525 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-21 01:50:46,526 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:50:46,675 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:50:46,675 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:50:46,773 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 18 [2021-11-21 01:50:46,827 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:50:46,827 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1869193850] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:50:46,827 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [676778950] [2021-11-21 01:50:46,830 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:50:46,831 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:50:46,831 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:50:46,831 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:50:46,832 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:50:46,921 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:46,923 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 01:50:47,194 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 20 treesize of output 16 [2021-11-21 01:50:47,516 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 01:50:47,517 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 193 treesize of output 192 [2021-11-21 01:50:48,483 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:50:48,794 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:50:49,521 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-21 01:50:49,522 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 49 [2021-11-21 01:50:49,967 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:49,992 INFO L354 Elim1Store]: treesize reduction 46, result has 32.4 percent of original size [2021-11-21 01:50:49,992 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 138 treesize of output 124 [2021-11-21 01:50:50,539 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:50:50,936 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:50:51,567 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:50:52,717 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:50:52,717 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:50:52,718 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 11 [2021-11-21 01:50:52,718 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2110627461] [2021-11-21 01:50:52,718 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:50:52,719 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-21 01:50:52,719 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:50:52,720 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-21 01:50:52,720 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=266, Unknown=0, NotChecked=0, Total=342 [2021-11-21 01:50:52,720 INFO L87 Difference]: Start difference. First operand 57 states and 67 transitions. Second operand has 13 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 12 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) [2021-11-21 01:50:52,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:50:52,976 INFO L93 Difference]: Finished difference Result 57 states and 67 transitions. [2021-11-21 01:50:52,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 01:50:52,977 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 12 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-21 01:50:52,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:50:52,980 INFO L225 Difference]: With dead ends: 57 [2021-11-21 01:50:52,980 INFO L226 Difference]: Without dead ends: 57 [2021-11-21 01:50:52,981 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=113, Invalid=349, Unknown=0, NotChecked=0, Total=462 [2021-11-21 01:50:52,983 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 241 mSDsluCounter, 114 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 241 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 124 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:50:52,984 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [241 Valid, 136 Invalid, 124 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 112 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:50:52,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-11-21 01:50:52,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2021-11-21 01:50:52,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 37 states have (on average 1.7837837837837838) internal successors, (66), 55 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:50:53,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 66 transitions. [2021-11-21 01:50:53,002 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 66 transitions. Word has length 8 [2021-11-21 01:50:53,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:50:53,002 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 66 transitions. [2021-11-21 01:50:53,002 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 12 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) [2021-11-21 01:50:53,003 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 66 transitions. [2021-11-21 01:50:53,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-21 01:50:53,003 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:50:53,003 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2021-11-21 01:50:53,053 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 01:50:53,229 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-21 01:50:53,229 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:50:53,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:50:53,230 INFO L85 PathProgramCache]: Analyzing trace with hash -145849192, now seen corresponding path program 1 times [2021-11-21 01:50:53,230 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:50:53,230 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1515396461] [2021-11-21 01:50:53,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:53,230 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:50:53,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:53,332 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:50:53,332 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:50:53,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1515396461] [2021-11-21 01:50:53,333 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1515396461] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:50:53,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1945041420] [2021-11-21 01:50:53,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:53,333 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:53,334 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:50:53,335 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:50:53,360 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 01:50:53,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:53,405 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-21 01:50:53,408 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:50:53,447 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-21 01:50:53,447 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-21 01:50:53,564 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:50:53,564 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:50:53,804 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:50:53,804 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1945041420] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:50:53,804 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [880748022] [2021-11-21 01:50:53,807 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-21 01:50:53,807 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:50:53,807 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:50:53,808 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:50:53,808 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:50:53,905 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:50:53,908 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 01:50:54,122 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 20 treesize of output 16 [2021-11-21 01:50:54,463 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 01:50:54,464 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 193 treesize of output 192 [2021-11-21 01:50:55,320 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:50:55,524 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:50:56,113 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-21 01:50:56,114 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 46 [2021-11-21 01:50:56,583 INFO L354 Elim1Store]: treesize reduction 44, result has 53.2 percent of original size [2021-11-21 01:50:56,583 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 134 treesize of output 143 [2021-11-21 01:50:57,728 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:50:57,995 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:50:58,133 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:50:59,066 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:50:59,069 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:50:59,069 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 11 [2021-11-21 01:50:59,069 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [363924931] [2021-11-21 01:50:59,069 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:50:59,070 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-21 01:50:59,070 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:50:59,070 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-21 01:50:59,071 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-11-21 01:50:59,071 INFO L87 Difference]: Start difference. First operand 56 states and 66 transitions. Second operand has 13 states, 12 states have (on average 1.75) internal successors, (21), 12 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:50:59,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:50:59,234 INFO L93 Difference]: Finished difference Result 55 states and 65 transitions. [2021-11-21 01:50:59,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-21 01:50:59,235 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 1.75) internal successors, (21), 12 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-21 01:50:59,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:50:59,235 INFO L225 Difference]: With dead ends: 55 [2021-11-21 01:50:59,235 INFO L226 Difference]: Without dead ends: 55 [2021-11-21 01:50:59,236 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=79, Invalid=301, Unknown=0, NotChecked=0, Total=380 [2021-11-21 01:50:59,236 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 174 mSDsluCounter, 114 mSDsCounter, 0 mSdLazyCounter, 124 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 174 SdHoareTripleChecker+Valid, 139 SdHoareTripleChecker+Invalid, 131 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 124 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:50:59,237 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [174 Valid, 139 Invalid, 131 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 124 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:50:59,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-11-21 01:50:59,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2021-11-21 01:50:59,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 36 states have (on average 1.7777777777777777) 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) [2021-11-21 01:50:59,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 64 transitions. [2021-11-21 01:50:59,242 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 64 transitions. Word has length 8 [2021-11-21 01:50:59,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:50:59,242 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 64 transitions. [2021-11-21 01:50:59,242 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 1.75) internal successors, (21), 12 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:50:59,242 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 64 transitions. [2021-11-21 01:50:59,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-21 01:50:59,243 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:50:59,243 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:50:59,295 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 01:50:59,464 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-21 01:50:59,465 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:50:59,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:50:59,465 INFO L85 PathProgramCache]: Analyzing trace with hash -226209389, now seen corresponding path program 1 times [2021-11-21 01:50:59,465 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:50:59,466 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1059020468] [2021-11-21 01:50:59,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:59,466 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:50:59,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:59,597 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:50:59,597 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:50:59,597 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1059020468] [2021-11-21 01:50:59,601 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1059020468] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:50:59,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2126679483] [2021-11-21 01:50:59,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:59,603 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:59,603 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:50:59,607 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:50:59,608 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 01:50:59,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:59,658 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-21 01:50:59,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:50:59,793 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:50:59,793 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:50:59,871 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 18 [2021-11-21 01:50:59,924 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:50:59,924 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2126679483] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:50:59,924 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1100905040] [2021-11-21 01:50:59,927 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-21 01:50:59,927 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:50:59,927 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:50:59,928 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:50:59,928 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:51:00,052 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:00,055 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 01:51:00,229 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:51:00,478 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:00,479 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 199 treesize of output 191 [2021-11-21 01:51:01,081 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:51:01,297 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:51:01,771 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-21 01:51:01,771 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 46 [2021-11-21 01:51:02,232 INFO L354 Elim1Store]: treesize reduction 44, result has 53.2 percent of original size [2021-11-21 01:51:02,232 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 134 treesize of output 143 [2021-11-21 01:51:02,948 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:51:03,220 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:51:03,767 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-21 01:51:03,767 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 41 [2021-11-21 01:51:03,902 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:51:05,060 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1100905040] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:51:05,061 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:51:05,061 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [4, 5, 5] total 19 [2021-11-21 01:51:05,062 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1776944976] [2021-11-21 01:51:05,062 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:51:05,062 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-21 01:51:05,062 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:51:05,062 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-21 01:51:05,063 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=323, Unknown=0, NotChecked=0, Total=420 [2021-11-21 01:51:05,063 INFO L87 Difference]: Start difference. First operand 54 states and 64 transitions. Second operand has 8 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:51:06,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:51:06,693 INFO L93 Difference]: Finished difference Result 53 states and 63 transitions. [2021-11-21 01:51:06,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 01:51:06,706 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-21 01:51:06,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:51:06,707 INFO L225 Difference]: With dead ends: 53 [2021-11-21 01:51:06,707 INFO L226 Difference]: Without dead ends: 53 [2021-11-21 01:51:06,708 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=151, Invalid=499, Unknown=0, NotChecked=0, Total=650 [2021-11-21 01:51:06,708 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 206 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 206 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 128 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:51:06,709 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [206 Valid, 72 Invalid, 128 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:51:06,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-11-21 01:51:06,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2021-11-21 01:51:06,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 36 states have (on average 1.75) internal successors, (63), 52 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:51:06,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 63 transitions. [2021-11-21 01:51:06,715 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 63 transitions. Word has length 9 [2021-11-21 01:51:06,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:51:06,716 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 63 transitions. [2021-11-21 01:51:06,716 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:51:06,716 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 63 transitions. [2021-11-21 01:51:06,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-21 01:51:06,717 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:51:06,717 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:51:06,757 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 01:51:06,945 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-21 01:51:06,945 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:51:06,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:51:06,946 INFO L85 PathProgramCache]: Analyzing trace with hash 1577447746, now seen corresponding path program 1 times [2021-11-21 01:51:06,946 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:51:06,946 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1406964959] [2021-11-21 01:51:06,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:51:06,946 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:51:06,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:51:07,014 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:51:07,015 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:51:07,015 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1406964959] [2021-11-21 01:51:07,015 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1406964959] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:51:07,015 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:51:07,015 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 01:51:07,016 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1541771356] [2021-11-21 01:51:07,016 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:51:07,016 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 01:51:07,016 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:51:07,017 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 01:51:07,017 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 01:51:07,017 INFO L87 Difference]: Start difference. First operand 53 states and 63 transitions. Second operand has 4 states, 3 states have (on average 3.3333333333333335) 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) [2021-11-21 01:51:07,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:51:07,077 INFO L93 Difference]: Finished difference Result 52 states and 62 transitions. [2021-11-21 01:51:07,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 01:51:07,078 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.3333333333333335) 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 [2021-11-21 01:51:07,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:51:07,079 INFO L225 Difference]: With dead ends: 52 [2021-11-21 01:51:07,080 INFO L226 Difference]: Without dead ends: 52 [2021-11-21 01:51:07,080 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:51:07,081 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 56 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:51:07,083 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 63 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:51:07,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-11-21 01:51:07,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2021-11-21 01:51:07,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 36 states have (on average 1.7222222222222223) internal successors, (62), 51 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:51:07,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 62 transitions. [2021-11-21 01:51:07,094 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 62 transitions. Word has length 10 [2021-11-21 01:51:07,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:51:07,095 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 62 transitions. [2021-11-21 01:51:07,095 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.3333333333333335) 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) [2021-11-21 01:51:07,095 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 62 transitions. [2021-11-21 01:51:07,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-21 01:51:07,096 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:51:07,096 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:51:07,096 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-21 01:51:07,096 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:51:07,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:51:07,096 INFO L85 PathProgramCache]: Analyzing trace with hash 1577447747, now seen corresponding path program 1 times [2021-11-21 01:51:07,097 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:51:07,097 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1765591650] [2021-11-21 01:51:07,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:51:07,097 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:51:07,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:51:07,215 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:51:07,215 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:51:07,216 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1765591650] [2021-11-21 01:51:07,216 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1765591650] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:51:07,216 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [600056909] [2021-11-21 01:51:07,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:51:07,216 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:51:07,216 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:51:07,217 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:51:07,219 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 01:51:07,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:51:07,272 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-21 01:51:07,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:51:07,355 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:51:07,355 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:51:07,382 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 01:51:07,406 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:51:07,406 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [600056909] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:51:07,406 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1616644639] [2021-11-21 01:51:07,408 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 01:51:07,409 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:51:07,409 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:51:07,409 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:51:07,409 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:51:07,501 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:07,502 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 01:51:07,799 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:51:07,997 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:07,998 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 199 treesize of output 191 [2021-11-21 01:51:08,548 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:51:08,731 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:51:09,274 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-21 01:51:09,275 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 46 [2021-11-21 01:51:09,634 INFO L354 Elim1Store]: treesize reduction 44, result has 53.2 percent of original size [2021-11-21 01:51:09,634 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 134 treesize of output 143 [2021-11-21 01:51:10,800 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:51:11,052 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:51:11,538 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-21 01:51:11,539 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 41 [2021-11-21 01:51:11,816 INFO L354 Elim1Store]: treesize reduction 68, result has 37.6 percent of original size [2021-11-21 01:51:11,816 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 47 treesize of output 62 [2021-11-21 01:51:12,152 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:51:13,405 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1616644639] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:51:13,405 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:51:13,406 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [5, 4, 4] total 15 [2021-11-21 01:51:13,406 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [197263690] [2021-11-21 01:51:13,406 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:51:13,407 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-21 01:51:13,407 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:51:13,407 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-21 01:51:13,408 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=207, Unknown=0, NotChecked=0, Total=272 [2021-11-21 01:51:13,408 INFO L87 Difference]: Start difference. First operand 52 states and 62 transitions. Second operand has 9 states, 8 states have (on average 1.25) internal successors, (10), 8 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) [2021-11-21 01:51:15,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:51:15,397 INFO L93 Difference]: Finished difference Result 51 states and 61 transitions. [2021-11-21 01:51:15,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-21 01:51:15,399 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 1.25) internal successors, (10), 8 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 [2021-11-21 01:51:15,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:51:15,400 INFO L225 Difference]: With dead ends: 51 [2021-11-21 01:51:15,400 INFO L226 Difference]: Without dead ends: 51 [2021-11-21 01:51:15,401 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=118, Invalid=388, Unknown=0, NotChecked=0, Total=506 [2021-11-21 01:51:15,401 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 192 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 157 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 192 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 169 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 157 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:51:15,402 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [192 Valid, 86 Invalid, 169 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 157 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:51:15,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-11-21 01:51:15,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2021-11-21 01:51:15,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 36 states have (on average 1.6944444444444444) internal successors, (61), 50 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) [2021-11-21 01:51:15,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 61 transitions. [2021-11-21 01:51:15,407 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 61 transitions. Word has length 10 [2021-11-21 01:51:15,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:51:15,407 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 61 transitions. [2021-11-21 01:51:15,407 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 1.25) internal successors, (10), 8 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) [2021-11-21 01:51:15,407 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 61 transitions. [2021-11-21 01:51:15,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-21 01:51:15,408 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:51:15,408 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:51:15,445 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 01:51:15,621 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-21 01:51:15,621 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:51:15,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:51:15,622 INFO L85 PathProgramCache]: Analyzing trace with hash -196055170, now seen corresponding path program 1 times [2021-11-21 01:51:15,622 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:51:15,622 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1586016361] [2021-11-21 01:51:15,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:51:15,622 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:51:15,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:51:15,697 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:51:15,697 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:51:15,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1586016361] [2021-11-21 01:51:15,697 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1586016361] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:51:15,697 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:51:15,697 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 01:51:15,697 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1956321750] [2021-11-21 01:51:15,697 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:51:15,698 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:51:15,698 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:51:15,698 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:51:15,698 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:51:15,698 INFO L87 Difference]: Start difference. First operand 51 states and 61 transitions. Second operand has 5 states, 4 states have (on average 3.0) internal successors, (12), 5 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:51:15,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:51:15,753 INFO L93 Difference]: Finished difference Result 52 states and 62 transitions. [2021-11-21 01:51:15,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 01:51:15,754 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.0) internal successors, (12), 5 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-21 01:51:15,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:51:15,754 INFO L225 Difference]: With dead ends: 52 [2021-11-21 01:51:15,755 INFO L226 Difference]: Without dead ends: 52 [2021-11-21 01:51:15,755 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-21 01:51:15,756 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 139 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:51:15,756 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [139 Valid, 37 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:51:15,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-11-21 01:51:15,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 50. [2021-11-21 01:51:15,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 36 states have (on average 1.6666666666666667) 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) [2021-11-21 01:51:15,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 60 transitions. [2021-11-21 01:51:15,760 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 60 transitions. Word has length 12 [2021-11-21 01:51:15,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:51:15,761 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 60 transitions. [2021-11-21 01:51:15,761 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.0) internal successors, (12), 5 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:51:15,761 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 60 transitions. [2021-11-21 01:51:15,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-21 01:51:15,762 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:51:15,762 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:51:15,762 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-21 01:51:15,762 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:51:15,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:51:15,763 INFO L85 PathProgramCache]: Analyzing trace with hash -196055169, now seen corresponding path program 1 times [2021-11-21 01:51:15,763 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:51:15,763 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [368562591] [2021-11-21 01:51:15,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:51:15,764 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:51:15,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:51:16,004 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:51:16,004 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:51:16,005 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [368562591] [2021-11-21 01:51:16,005 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [368562591] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:51:16,005 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2032754392] [2021-11-21 01:51:16,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:51:16,005 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:51:16,005 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:51:16,006 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:51:16,009 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 01:51:16,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:51:16,066 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-21 01:51:16,068 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:51:16,193 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 27 treesize of output 23 [2021-11-21 01:51:16,297 INFO L354 Elim1Store]: treesize reduction 8, result has 27.3 percent of original size [2021-11-21 01:51:16,298 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 33 treesize of output 25 [2021-11-21 01:51:16,304 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:51:16,305 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:51:16,338 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 18 [2021-11-21 01:51:16,341 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 24 [2021-11-21 01:51:16,556 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:51:16,556 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2032754392] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:51:16,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1939774620] [2021-11-21 01:51:16,558 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-21 01:51:16,559 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:51:16,559 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:51:16,559 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:51:16,560 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:51:16,679 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:16,681 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 01:51:16,897 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 20 treesize of output 16 [2021-11-21 01:51:17,151 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 01:51:17,151 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 193 treesize of output 192 [2021-11-21 01:51:17,792 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:51:18,041 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:51:18,729 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-21 01:51:18,729 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 49 [2021-11-21 01:51:19,017 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:19,049 INFO L354 Elim1Store]: treesize reduction 46, result has 32.4 percent of original size [2021-11-21 01:51:19,049 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 138 treesize of output 124 [2021-11-21 01:51:19,647 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:51:19,850 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:51:20,400 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-21 01:51:20,401 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 41 [2021-11-21 01:51:20,637 INFO L354 Elim1Store]: treesize reduction 68, result has 37.6 percent of original size [2021-11-21 01:51:20,638 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 47 treesize of output 62 [2021-11-21 01:51:21,429 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:51:23,156 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1939774620] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:51:23,156 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:51:23,156 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [8, 8, 8] total 28 [2021-11-21 01:51:23,156 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2021269163] [2021-11-21 01:51:23,156 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:51:23,157 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-21 01:51:23,157 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:51:23,157 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-21 01:51:23,158 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=697, Unknown=0, NotChecked=0, Total=812 [2021-11-21 01:51:23,158 INFO L87 Difference]: Start difference. First operand 50 states and 60 transitions. Second operand has 11 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:51:26,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:51:26,082 INFO L93 Difference]: Finished difference Result 55 states and 66 transitions. [2021-11-21 01:51:26,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-21 01:51:26,083 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-21 01:51:26,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:51:26,084 INFO L225 Difference]: With dead ends: 55 [2021-11-21 01:51:26,084 INFO L226 Difference]: Without dead ends: 55 [2021-11-21 01:51:26,085 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 328 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=184, Invalid=1148, Unknown=0, NotChecked=0, Total=1332 [2021-11-21 01:51:26,085 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 109 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 192 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 206 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 192 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:51:26,086 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [109 Valid, 95 Invalid, 206 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 192 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:51:26,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-11-21 01:51:26,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 51. [2021-11-21 01:51:26,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 37 states have (on average 1.6486486486486487) internal successors, (61), 50 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) [2021-11-21 01:51:26,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 61 transitions. [2021-11-21 01:51:26,089 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 61 transitions. Word has length 12 [2021-11-21 01:51:26,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:51:26,089 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 61 transitions. [2021-11-21 01:51:26,090 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:51:26,090 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 61 transitions. [2021-11-21 01:51:26,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-21 01:51:26,090 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:51:26,090 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:51:26,116 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 01:51:26,293 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-21 01:51:26,293 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:51:26,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:51:26,294 INFO L85 PathProgramCache]: Analyzing trace with hash 569547529, now seen corresponding path program 1 times [2021-11-21 01:51:26,294 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:51:26,294 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1062389887] [2021-11-21 01:51:26,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:51:26,294 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:51:26,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:51:26,390 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:51:26,390 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:51:26,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1062389887] [2021-11-21 01:51:26,390 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1062389887] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:51:26,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [635866305] [2021-11-21 01:51:26,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:51:26,390 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:51:26,391 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:51:26,391 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:51:26,393 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 01:51:26,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:51:26,456 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-21 01:51:26,458 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:51:26,471 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-21 01:51:26,472 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-21 01:51:26,592 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:51:26,593 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:51:26,704 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:51:26,704 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [635866305] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:51:26,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1947431840] [2021-11-21 01:51:26,707 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:51:26,707 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:51:26,707 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:51:26,708 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:51:26,708 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:51:26,775 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:26,776 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 01:51:26,999 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:51:27,219 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:27,220 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 199 treesize of output 191 [2021-11-21 01:51:27,747 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:51:27,927 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:51:28,440 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-21 01:51:28,441 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 49 [2021-11-21 01:51:28,786 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:28,811 INFO L354 Elim1Store]: treesize reduction 46, result has 32.4 percent of original size [2021-11-21 01:51:28,812 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 138 treesize of output 124 [2021-11-21 01:51:29,346 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:51:29,560 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:51:30,244 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-21 01:51:30,245 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 41 [2021-11-21 01:51:30,388 INFO L354 Elim1Store]: treesize reduction 68, result has 37.6 percent of original size [2021-11-21 01:51:30,388 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 47 treesize of output 62 [2021-11-21 01:51:34,966 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:51:37,581 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:51:37,581 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:51:37,582 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 17 [2021-11-21 01:51:37,582 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [963521848] [2021-11-21 01:51:37,582 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:51:37,582 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-21 01:51:37,582 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:51:37,583 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-21 01:51:37,583 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=712, Unknown=0, NotChecked=0, Total=812 [2021-11-21 01:51:37,583 INFO L87 Difference]: Start difference. First operand 51 states and 61 transitions. Second operand has 18 states, 18 states have (on average 1.7777777777777777) internal successors, (32), 17 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:51:37,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:51:37,911 INFO L93 Difference]: Finished difference Result 63 states and 73 transitions. [2021-11-21 01:51:37,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-21 01:51:37,912 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.7777777777777777) internal successors, (32), 17 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-11-21 01:51:37,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:51:37,913 INFO L225 Difference]: With dead ends: 63 [2021-11-21 01:51:37,913 INFO L226 Difference]: Without dead ends: 62 [2021-11-21 01:51:37,914 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 321 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=167, Invalid=955, Unknown=0, NotChecked=0, Total=1122 [2021-11-21 01:51:37,914 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 101 mSDsluCounter, 272 mSDsCounter, 0 mSdLazyCounter, 243 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 101 SdHoareTripleChecker+Valid, 276 SdHoareTripleChecker+Invalid, 258 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 243 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:51:37,915 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [101 Valid, 276 Invalid, 258 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 243 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:51:37,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-11-21 01:51:37,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 57. [2021-11-21 01:51:37,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 43 states have (on average 1.5813953488372092) internal successors, (68), 56 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:51:37,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 68 transitions. [2021-11-21 01:51:37,918 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 68 transitions. Word has length 14 [2021-11-21 01:51:37,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:51:37,919 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 68 transitions. [2021-11-21 01:51:37,919 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.7777777777777777) internal successors, (32), 17 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:51:37,920 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 68 transitions. [2021-11-21 01:51:37,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-21 01:51:37,920 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:51:37,921 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:51:37,970 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 01:51:38,121 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:51:38,121 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr24ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:51:38,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:51:38,122 INFO L85 PathProgramCache]: Analyzing trace with hash 572774269, now seen corresponding path program 1 times [2021-11-21 01:51:38,122 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:51:38,122 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2074012073] [2021-11-21 01:51:38,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:51:38,122 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:51:38,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:51:38,262 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:51:38,262 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:51:38,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2074012073] [2021-11-21 01:51:38,262 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2074012073] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:51:38,262 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:51:38,263 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 01:51:38,263 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1680300821] [2021-11-21 01:51:38,263 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:51:38,263 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 01:51:38,263 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:51:38,263 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 01:51:38,263 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 01:51:38,264 INFO L87 Difference]: Start difference. First operand 57 states and 68 transitions. Second operand has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:51:38,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:51:38,328 INFO L93 Difference]: Finished difference Result 56 states and 67 transitions. [2021-11-21 01:51:38,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 01:51:38,328 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-11-21 01:51:38,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:51:38,329 INFO L225 Difference]: With dead ends: 56 [2021-11-21 01:51:38,329 INFO L226 Difference]: Without dead ends: 48 [2021-11-21 01:51:38,330 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 01:51:38,331 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 44 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:51:38,331 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 64 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:51:38,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-11-21 01:51:38,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2021-11-21 01:51:38,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 35 states have (on average 1.6) internal successors, (56), 47 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) [2021-11-21 01:51:38,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 56 transitions. [2021-11-21 01:51:38,335 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 56 transitions. Word has length 14 [2021-11-21 01:51:38,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:51:38,335 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 56 transitions. [2021-11-21 01:51:38,335 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:51:38,335 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 56 transitions. [2021-11-21 01:51:38,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-21 01:51:38,336 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:51:38,336 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:51:38,337 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-21 01:51:38,337 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:51:38,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:51:38,337 INFO L85 PathProgramCache]: Analyzing trace with hash 922644863, now seen corresponding path program 2 times [2021-11-21 01:51:38,338 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:51:38,338 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [911789967] [2021-11-21 01:51:38,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:51:38,338 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:51:38,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:51:38,638 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:51:38,639 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:51:38,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [911789967] [2021-11-21 01:51:38,639 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [911789967] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:51:38,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1380520365] [2021-11-21 01:51:38,639 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:51:38,639 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:51:38,639 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:51:38,640 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:51:38,641 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 01:51:38,703 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-21 01:51:38,703 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:51:38,705 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-21 01:51:38,707 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:51:38,755 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 22 treesize of output 18 [2021-11-21 01:51:38,924 INFO L354 Elim1Store]: treesize reduction 6, result has 71.4 percent of original size [2021-11-21 01:51:38,924 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 33 treesize of output 33 [2021-11-21 01:51:39,012 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-21 01:51:39,013 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:51:39,244 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 50 [2021-11-21 01:51:39,247 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 50 treesize of output 46 [2021-11-21 01:51:39,256 INFO L354 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2021-11-21 01:51:39,256 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 66 treesize of output 60 [2021-11-21 01:51:39,360 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-21 01:51:39,360 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1380520365] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:51:39,360 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [986339972] [2021-11-21 01:51:39,363 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:51:39,363 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:51:39,363 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:51:39,364 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:51:39,364 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:51:39,478 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:39,481 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 01:51:39,673 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 20 treesize of output 16 [2021-11-21 01:51:39,932 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 01:51:39,933 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 193 treesize of output 192 [2021-11-21 01:51:40,683 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:51:40,954 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:51:41,539 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-21 01:51:41,540 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 46 [2021-11-21 01:51:41,940 INFO L354 Elim1Store]: treesize reduction 44, result has 53.2 percent of original size [2021-11-21 01:51:41,940 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 134 treesize of output 143 [2021-11-21 01:51:42,835 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:51:43,118 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:51:43,640 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-21 01:51:43,641 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 41 [2021-11-21 01:51:43,796 INFO L354 Elim1Store]: treesize reduction 68, result has 37.6 percent of original size [2021-11-21 01:51:43,796 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 47 treesize of output 62 [2021-11-21 01:51:47,936 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:51:50,946 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:51:50,946 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:51:50,946 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 6, 6] total 23 [2021-11-21 01:51:50,946 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [712606056] [2021-11-21 01:51:50,946 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:51:50,947 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-21 01:51:50,947 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:51:50,947 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-21 01:51:50,948 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=1050, Unknown=0, NotChecked=0, Total=1190 [2021-11-21 01:51:50,948 INFO L87 Difference]: Start difference. First operand 48 states and 56 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 23 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) [2021-11-21 01:51:51,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:51:51,803 INFO L93 Difference]: Finished difference Result 122 states and 143 transitions. [2021-11-21 01:51:51,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-21 01:51:51,804 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 23 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) Word has length 16 [2021-11-21 01:51:51,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:51:51,805 INFO L225 Difference]: With dead ends: 122 [2021-11-21 01:51:51,805 INFO L226 Difference]: Without dead ends: 122 [2021-11-21 01:51:51,806 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 335 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=230, Invalid=1750, Unknown=0, NotChecked=0, Total=1980 [2021-11-21 01:51:51,807 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 94 mSDsluCounter, 684 mSDsCounter, 0 mSdLazyCounter, 583 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 690 SdHoareTripleChecker+Invalid, 641 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 583 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 48 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:51:51,808 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [94 Valid, 690 Invalid, 641 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 583 Invalid, 0 Unknown, 48 Unchecked, 0.4s Time] [2021-11-21 01:51:51,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-11-21 01:51:51,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 58. [2021-11-21 01:51:51,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 45 states have (on average 1.511111111111111) internal successors, (68), 57 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:51:51,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 68 transitions. [2021-11-21 01:51:51,812 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 68 transitions. Word has length 16 [2021-11-21 01:51:51,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:51:51,812 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 68 transitions. [2021-11-21 01:51:51,812 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 23 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) [2021-11-21 01:51:51,813 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 68 transitions. [2021-11-21 01:51:51,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-21 01:51:51,814 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:51:51,814 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:51:51,857 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-21 01:51:52,033 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-21 01:51:52,033 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr12REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:51:52,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:51:52,034 INFO L85 PathProgramCache]: Analyzing trace with hash -1378515559, now seen corresponding path program 1 times [2021-11-21 01:51:52,034 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:51:52,034 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [286207013] [2021-11-21 01:51:52,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:51:52,034 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:51:52,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:51:52,086 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:51:52,087 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:51:52,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [286207013] [2021-11-21 01:51:52,087 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [286207013] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:51:52,087 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:51:52,087 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 01:51:52,088 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [598830511] [2021-11-21 01:51:52,088 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:51:52,090 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:51:52,091 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:51:52,091 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:51:52,091 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:51:52,091 INFO L87 Difference]: Start difference. First operand 58 states and 68 transitions. Second operand has 5 states, 4 states have (on average 4.25) internal successors, (17), 5 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:51:52,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:51:52,161 INFO L93 Difference]: Finished difference Result 57 states and 67 transitions. [2021-11-21 01:51:52,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 01:51:52,161 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 4.25) internal successors, (17), 5 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-11-21 01:51:52,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:51:52,163 INFO L225 Difference]: With dead ends: 57 [2021-11-21 01:51:52,163 INFO L226 Difference]: Without dead ends: 57 [2021-11-21 01:51:52,163 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-21 01:51:52,164 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 78 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 78 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:51:52,165 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [78 Valid, 49 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:51:52,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-11-21 01:51:52,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2021-11-21 01:51:52,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 45 states have (on average 1.488888888888889) internal successors, (67), 56 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:51:52,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 67 transitions. [2021-11-21 01:51:52,169 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 67 transitions. Word has length 19 [2021-11-21 01:51:52,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:51:52,170 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 67 transitions. [2021-11-21 01:51:52,170 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 4.25) internal successors, (17), 5 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:51:52,170 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 67 transitions. [2021-11-21 01:51:52,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-21 01:51:52,172 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:51:52,172 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:51:52,172 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-11-21 01:51:52,173 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:51:52,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:51:52,173 INFO L85 PathProgramCache]: Analyzing trace with hash -1378515558, now seen corresponding path program 1 times [2021-11-21 01:51:52,173 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:51:52,174 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1561981308] [2021-11-21 01:51:52,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:51:52,174 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:51:52,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:51:52,290 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:51:52,290 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:51:52,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1561981308] [2021-11-21 01:51:52,291 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1561981308] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:51:52,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1554180345] [2021-11-21 01:51:52,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:51:52,291 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:51:52,292 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:51:52,293 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:51:52,315 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-21 01:51:52,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:51:52,371 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-21 01:51:52,373 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:51:52,517 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:51:52,517 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:51:52,625 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 01:51:52,659 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:51:52,659 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1554180345] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:51:52,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1312704628] [2021-11-21 01:51:52,662 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-21 01:51:52,662 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:51:52,662 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:51:52,663 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:51:52,663 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:51:52,782 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:51:52,783 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 01:51:52,947 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 20 treesize of output 16 [2021-11-21 01:51:53,302 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 01:51:53,302 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 180 treesize of output 179 [2021-11-21 01:51:53,796 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:51:54,059 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 20 treesize of output 16 [2021-11-21 01:51:54,384 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 01:51:54,385 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 69 treesize of output 68 [2021-11-21 01:51:54,663 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:51:54,901 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 14 treesize of output 10 [2021-11-21 01:51:55,135 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 01:51:55,136 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-21 01:51:57,562 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:51:59,268 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1312704628] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:51:59,268 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:51:59,268 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [4, 4, 4] total 18 [2021-11-21 01:51:59,268 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1587249889] [2021-11-21 01:51:59,268 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:51:59,269 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-21 01:51:59,269 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:51:59,269 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-21 01:51:59,269 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=275, Unknown=0, NotChecked=0, Total=380 [2021-11-21 01:51:59,269 INFO L87 Difference]: Start difference. First operand 57 states and 67 transitions. Second operand has 15 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:52:00,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:52:00,277 INFO L93 Difference]: Finished difference Result 62 states and 72 transitions. [2021-11-21 01:52:00,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-21 01:52:00,278 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-11-21 01:52:00,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:52:00,278 INFO L225 Difference]: With dead ends: 62 [2021-11-21 01:52:00,278 INFO L226 Difference]: Without dead ends: 62 [2021-11-21 01:52:00,279 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=149, Invalid=357, Unknown=0, NotChecked=0, Total=506 [2021-11-21 01:52:00,280 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 143 mSDsluCounter, 126 mSDsCounter, 0 mSdLazyCounter, 333 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 143 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 350 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 333 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 01:52:00,280 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [143 Valid, 132 Invalid, 350 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 333 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-21 01:52:00,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-11-21 01:52:00,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2021-11-21 01:52:00,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 49 states have (on average 1.4489795918367347) internal successors, (71), 60 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) [2021-11-21 01:52:00,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 71 transitions. [2021-11-21 01:52:00,283 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 71 transitions. Word has length 19 [2021-11-21 01:52:00,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:52:00,283 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 71 transitions. [2021-11-21 01:52:00,283 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:52:00,284 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 71 transitions. [2021-11-21 01:52:00,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-21 01:52:00,287 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:52:00,288 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:52:00,331 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-21 01:52:00,488 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-21 01:52:00,489 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:52:00,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:52:00,489 INFO L85 PathProgramCache]: Analyzing trace with hash -690501505, now seen corresponding path program 3 times [2021-11-21 01:52:00,489 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:52:00,489 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [875521851] [2021-11-21 01:52:00,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:52:00,490 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:52:00,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:52:00,778 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:52:00,779 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:52:00,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [875521851] [2021-11-21 01:52:00,779 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [875521851] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:52:00,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1857203861] [2021-11-21 01:52:00,779 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:52:00,779 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:52:00,780 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:52:00,785 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:52:00,786 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-21 01:52:00,869 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:52:00,870 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:52:00,872 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-21 01:52:00,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:52:01,044 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 21 treesize of output 17 [2021-11-21 01:52:01,095 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-21 01:52:01,101 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:52:01,101 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:52:01,132 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-21 01:52:01,134 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-21 01:52:01,296 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:52:01,296 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1857203861] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:52:01,296 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1633701940] [2021-11-21 01:52:01,299 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:52:01,299 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:52:01,299 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:52:01,299 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:52:01,300 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:52:01,381 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:01,382 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 01:52:01,611 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 20 treesize of output 16 [2021-11-21 01:52:01,847 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 01:52:01,848 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 193 treesize of output 192 [2021-11-21 01:52:02,554 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:52:02,751 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:52:03,372 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-21 01:52:03,373 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 49 [2021-11-21 01:52:03,661 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:03,693 INFO L354 Elim1Store]: treesize reduction 46, result has 32.4 percent of original size [2021-11-21 01:52:03,694 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 138 treesize of output 124 [2021-11-21 01:52:04,282 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:52:04,545 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:52:05,003 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-21 01:52:05,004 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 41 [2021-11-21 01:52:05,268 INFO L354 Elim1Store]: treesize reduction 68, result has 37.6 percent of original size [2021-11-21 01:52:05,269 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 47 treesize of output 62 [2021-11-21 01:52:09,362 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:52:12,207 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:52:12,207 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:52:12,207 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 22 [2021-11-21 01:52:12,207 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1608203390] [2021-11-21 01:52:12,207 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:52:12,208 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-21 01:52:12,208 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:52:12,208 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-21 01:52:12,209 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=948, Unknown=0, NotChecked=0, Total=1056 [2021-11-21 01:52:12,209 INFO L87 Difference]: Start difference. First operand 61 states and 71 transitions. Second operand has 22 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 22 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) [2021-11-21 01:52:13,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:52:13,245 INFO L93 Difference]: Finished difference Result 168 states and 195 transitions. [2021-11-21 01:52:13,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-21 01:52:13,246 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 22 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 20 [2021-11-21 01:52:13,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:52:13,247 INFO L225 Difference]: With dead ends: 168 [2021-11-21 01:52:13,248 INFO L226 Difference]: Without dead ends: 168 [2021-11-21 01:52:13,249 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 37 SyntacticMatches, 3 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 361 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=250, Invalid=1820, Unknown=0, NotChecked=0, Total=2070 [2021-11-21 01:52:13,250 INFO L933 BasicCegarLoop]: 89 mSDtfsCounter, 902 mSDsluCounter, 1027 mSDsCounter, 0 mSdLazyCounter, 568 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 902 SdHoareTripleChecker+Valid, 1003 SdHoareTripleChecker+Invalid, 609 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 568 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:52:13,250 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [902 Valid, 1003 Invalid, 609 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 568 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:52:13,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-11-21 01:52:13,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 71. [2021-11-21 01:52:13,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 59 states have (on average 1.4067796610169492) internal successors, (83), 70 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) [2021-11-21 01:52:13,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 83 transitions. [2021-11-21 01:52:13,255 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 83 transitions. Word has length 20 [2021-11-21 01:52:13,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:52:13,255 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 83 transitions. [2021-11-21 01:52:13,256 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 22 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) [2021-11-21 01:52:13,256 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 83 transitions. [2021-11-21 01:52:13,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-21 01:52:13,257 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:52:13,257 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:52:13,301 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-21 01:52:13,485 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:52:13,485 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:52:13,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:52:13,486 INFO L85 PathProgramCache]: Analyzing trace with hash -1890947467, now seen corresponding path program 4 times [2021-11-21 01:52:13,486 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:52:13,486 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2048296697] [2021-11-21 01:52:13,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:52:13,486 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:52:13,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:52:13,697 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:52:13,697 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:52:13,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2048296697] [2021-11-21 01:52:13,698 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2048296697] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:52:13,698 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [88616979] [2021-11-21 01:52:13,698 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:52:13,698 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:52:13,698 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:52:13,709 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:52:13,733 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-21 01:52:13,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:52:13,788 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-21 01:52:13,790 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:52:13,984 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:52:13,984 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:52:14,213 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-11-21 01:52:14,248 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:52:14,248 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [88616979] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:52:14,248 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [812726499] [2021-11-21 01:52:14,251 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:52:14,251 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:52:14,251 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:52:14,252 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:52:14,252 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:52:14,326 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:14,327 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 01:52:14,600 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 20 treesize of output 16 [2021-11-21 01:52:14,920 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 01:52:14,921 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 193 treesize of output 192 [2021-11-21 01:52:15,508 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:52:15,788 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:52:16,205 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-21 01:52:16,206 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 46 [2021-11-21 01:52:16,616 INFO L354 Elim1Store]: treesize reduction 44, result has 53.2 percent of original size [2021-11-21 01:52:16,617 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 134 treesize of output 143 [2021-11-21 01:52:17,672 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:52:17,844 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:52:18,308 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-21 01:52:18,308 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 41 [2021-11-21 01:52:18,584 INFO L354 Elim1Store]: treesize reduction 68, result has 37.6 percent of original size [2021-11-21 01:52:18,584 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 47 treesize of output 62 [2021-11-21 01:52:22,780 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:52:25,687 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:52:25,687 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:52:25,687 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 24 [2021-11-21 01:52:25,687 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1141531493] [2021-11-21 01:52:25,687 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:52:25,688 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-21 01:52:25,688 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:52:25,688 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-21 01:52:25,689 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=1136, Unknown=0, NotChecked=0, Total=1260 [2021-11-21 01:52:25,689 INFO L87 Difference]: Start difference. First operand 71 states and 83 transitions. Second operand has 25 states, 24 states have (on average 2.0416666666666665) internal successors, (49), 25 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:52:26,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:52:26,921 INFO L93 Difference]: Finished difference Result 230 states and 269 transitions. [2021-11-21 01:52:26,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-21 01:52:26,922 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 2.0416666666666665) internal successors, (49), 25 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-11-21 01:52:26,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:52:26,924 INFO L225 Difference]: With dead ends: 230 [2021-11-21 01:52:26,924 INFO L226 Difference]: Without dead ends: 230 [2021-11-21 01:52:26,926 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 373 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=362, Invalid=1990, Unknown=0, NotChecked=0, Total=2352 [2021-11-21 01:52:26,926 INFO L933 BasicCegarLoop]: 110 mSDtfsCounter, 978 mSDsluCounter, 880 mSDsCounter, 0 mSdLazyCounter, 997 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 978 SdHoareTripleChecker+Valid, 943 SdHoareTripleChecker+Invalid, 1029 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 997 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 01:52:26,927 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [978 Valid, 943 Invalid, 1029 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 997 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-21 01:52:26,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2021-11-21 01:52:26,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 73. [2021-11-21 01:52:26,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 61 states have (on average 1.4098360655737705) internal successors, (86), 72 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:52:26,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 86 transitions. [2021-11-21 01:52:26,932 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 86 transitions. Word has length 22 [2021-11-21 01:52:26,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:52:26,933 INFO L470 AbstractCegarLoop]: Abstraction has 73 states and 86 transitions. [2021-11-21 01:52:26,933 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 2.0416666666666665) internal successors, (49), 25 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:52:26,933 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 86 transitions. [2021-11-21 01:52:26,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-21 01:52:26,934 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:52:26,934 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:52:26,981 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-21 01:52:27,153 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:52:27,153 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:52:27,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:52:27,153 INFO L85 PathProgramCache]: Analyzing trace with hash 460224418, now seen corresponding path program 1 times [2021-11-21 01:52:27,154 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:52:27,154 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [803486436] [2021-11-21 01:52:27,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:52:27,154 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:52:27,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:52:27,466 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:52:27,467 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:52:27,467 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [803486436] [2021-11-21 01:52:27,467 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [803486436] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:52:27,467 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [780923595] [2021-11-21 01:52:27,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:52:27,467 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:52:27,467 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:52:27,468 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:52:27,469 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-21 01:52:27,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:52:27,540 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-21 01:52:27,542 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:52:27,557 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-21 01:52:27,706 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-21 01:52:27,770 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 01:52:27,770 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 34 [2021-11-21 01:52:28,068 INFO L354 Elim1Store]: treesize reduction 42, result has 6.7 percent of original size [2021-11-21 01:52:28,068 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 38 treesize of output 23 [2021-11-21 01:52:28,080 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:52:28,081 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:52:29,186 WARN L838 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_main_~nondetString2~0#1.offset| Int) (|ULTIMATE.start_main_~length2~0#1| Int)) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| (store (select |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base|) (+ (- 1) |ULTIMATE.start_main_~nondetString2~0#1.offset| |ULTIMATE.start_main_~length2~0#1|) 0)) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) |c_ULTIMATE.start_main_~nondetString1~0#1.offset|) 0)) is different from false [2021-11-21 01:52:29,201 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 42 [2021-11-21 01:52:29,397 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:52:29,397 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [780923595] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:52:29,398 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [851989624] [2021-11-21 01:52:29,400 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-21 01:52:29,400 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:52:29,400 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:52:29,401 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:52:29,401 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:52:29,581 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:29,583 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 01:52:29,757 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 20 treesize of output 16 [2021-11-21 01:52:30,290 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 01:52:30,290 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 180 treesize of output 179 [2021-11-21 01:52:30,934 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:52:31,194 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 20 treesize of output 16 [2021-11-21 01:52:31,426 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 01:52:31,428 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 69 treesize of output 68 [2021-11-21 01:52:31,688 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:52:31,852 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 14 treesize of output 10 [2021-11-21 01:52:32,078 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 01:52:32,079 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-21 01:52:42,498 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:52:46,260 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:52:46,260 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:52:46,260 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 9] total 22 [2021-11-21 01:52:46,261 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1224555828] [2021-11-21 01:52:46,261 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:52:46,261 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-21 01:52:46,261 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:52:46,262 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-21 01:52:46,268 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=1334, Unknown=1, NotChecked=74, Total=1560 [2021-11-21 01:52:46,269 INFO L87 Difference]: Start difference. First operand 73 states and 86 transitions. Second operand has 23 states, 23 states have (on average 2.391304347826087) internal successors, (55), 22 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) [2021-11-21 01:52:50,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:52:50,087 INFO L93 Difference]: Finished difference Result 108 states and 126 transitions. [2021-11-21 01:52:50,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-21 01:52:50,088 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.391304347826087) internal successors, (55), 22 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 23 [2021-11-21 01:52:50,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:52:50,089 INFO L225 Difference]: With dead ends: 108 [2021-11-21 01:52:50,089 INFO L226 Difference]: Without dead ends: 97 [2021-11-21 01:52:50,090 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 493 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=193, Invalid=1616, Unknown=1, NotChecked=82, Total=1892 [2021-11-21 01:52:50,091 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 25 mSDsluCounter, 367 mSDsCounter, 0 mSdLazyCounter, 177 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 358 SdHoareTripleChecker+Invalid, 224 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 177 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 41 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:52:50,091 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 358 Invalid, 224 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 177 Invalid, 0 Unknown, 41 Unchecked, 0.1s Time] [2021-11-21 01:52:50,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-11-21 01:52:50,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 96. [2021-11-21 01:52:50,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 84 states have (on average 1.3333333333333333) internal successors, (112), 95 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) [2021-11-21 01:52:50,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 112 transitions. [2021-11-21 01:52:50,096 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 112 transitions. Word has length 23 [2021-11-21 01:52:50,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:52:50,096 INFO L470 AbstractCegarLoop]: Abstraction has 96 states and 112 transitions. [2021-11-21 01:52:50,097 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.391304347826087) internal successors, (55), 22 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) [2021-11-21 01:52:50,097 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 112 transitions. [2021-11-21 01:52:50,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-21 01:52:50,098 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:52:50,098 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:52:50,145 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-21 01:52:50,317 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:52:50,317 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:52:50,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:52:50,317 INFO L85 PathProgramCache]: Analyzing trace with hash 2062077594, now seen corresponding path program 1 times [2021-11-21 01:52:50,318 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:52:50,318 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [245478871] [2021-11-21 01:52:50,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:52:50,318 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:52:50,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:52:50,390 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 01:52:50,390 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:52:50,391 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [245478871] [2021-11-21 01:52:50,391 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [245478871] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:52:50,391 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1767895868] [2021-11-21 01:52:50,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:52:50,392 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:52:50,392 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:52:50,393 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:52:50,409 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-21 01:52:50,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:52:50,485 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-21 01:52:50,486 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:52:50,500 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 01:52:50,501 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-21 01:52:50,503 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-21 01:52:50,684 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 01:52:50,684 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:52:50,818 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 01:52:50,818 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1767895868] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-21 01:52:50,818 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:52:50,818 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4, 4] total 9 [2021-11-21 01:52:50,818 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1143226536] [2021-11-21 01:52:50,818 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:52:50,819 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 01:52:50,819 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:52:50,819 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 01:52:50,819 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-11-21 01:52:50,819 INFO L87 Difference]: Start difference. First operand 96 states and 112 transitions. Second operand has 6 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:52:50,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:52:50,900 INFO L93 Difference]: Finished difference Result 99 states and 115 transitions. [2021-11-21 01:52:50,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 01:52:50,900 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2021-11-21 01:52:50,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:52:50,901 INFO L225 Difference]: With dead ends: 99 [2021-11-21 01:52:50,901 INFO L226 Difference]: Without dead ends: 99 [2021-11-21 01:52:50,901 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2021-11-21 01:52:50,902 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 97 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:52:50,902 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [97 Valid, 68 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:52:50,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-11-21 01:52:50,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 93. [2021-11-21 01:52:50,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 81 states have (on average 1.345679012345679) internal successors, (109), 92 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) [2021-11-21 01:52:50,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 109 transitions. [2021-11-21 01:52:50,906 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 109 transitions. Word has length 23 [2021-11-21 01:52:50,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:52:50,907 INFO L470 AbstractCegarLoop]: Abstraction has 93 states and 109 transitions. [2021-11-21 01:52:50,907 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:52:50,907 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 109 transitions. [2021-11-21 01:52:50,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-21 01:52:50,908 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:52:50,908 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:52:50,944 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-21 01:52:51,125 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-11-21 01:52:51,125 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:52:51,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:52:51,126 INFO L85 PathProgramCache]: Analyzing trace with hash -429345665, now seen corresponding path program 5 times [2021-11-21 01:52:51,126 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:52:51,126 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2142877634] [2021-11-21 01:52:51,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:52:51,126 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:52:51,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:52:51,378 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 3 proven. 22 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:52:51,378 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:52:51,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2142877634] [2021-11-21 01:52:51,378 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2142877634] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:52:51,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [959255569] [2021-11-21 01:52:51,378 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:52:51,379 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:52:51,379 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:52:51,380 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:52:51,382 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-21 01:52:51,453 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-21 01:52:51,453 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:52:51,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-21 01:52:51,457 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:52:51,479 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-21 01:52:51,480 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-21 01:52:51,572 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:52:51,739 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-21 01:52:51,740 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 26 treesize of output 26 [2021-11-21 01:52:51,828 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-21 01:52:51,828 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:52:52,145 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 29 [2021-11-21 01:52:52,149 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 35 [2021-11-21 01:52:52,288 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-21 01:52:52,288 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [959255569] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:52:52,288 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1473779265] [2021-11-21 01:52:52,290 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:52:52,290 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:52:52,291 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:52:52,291 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:52:52,291 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:52:52,370 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:52,371 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 01:52:52,620 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:52:52,924 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:52,927 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 199 treesize of output 191 [2021-11-21 01:52:53,434 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:52:53,726 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:52:54,164 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-21 01:52:54,164 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 49 [2021-11-21 01:52:54,474 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:54,501 INFO L354 Elim1Store]: treesize reduction 46, result has 32.4 percent of original size [2021-11-21 01:52:54,501 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 138 treesize of output 124 [2021-11-21 01:52:55,079 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:52:55,302 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:52:55,850 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-21 01:52:55,851 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 41 [2021-11-21 01:52:56,098 INFO L354 Elim1Store]: treesize reduction 68, result has 37.6 percent of original size [2021-11-21 01:52:56,098 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 47 treesize of output 62 [2021-11-21 01:53:00,218 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:53:03,265 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:53:03,265 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:53:03,265 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 5, 5] total 25 [2021-11-21 01:53:03,265 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1157476491] [2021-11-21 01:53:03,265 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:53:03,266 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-21 01:53:03,266 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:53:03,266 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-21 01:53:03,267 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1219, Unknown=0, NotChecked=0, Total=1332 [2021-11-21 01:53:03,268 INFO L87 Difference]: Start difference. First operand 93 states and 109 transitions. Second operand has 26 states, 26 states have (on average 2.1538461538461537) internal successors, (56), 25 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) [2021-11-21 01:53:04,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:53:04,427 INFO L93 Difference]: Finished difference Result 113 states and 133 transitions. [2021-11-21 01:53:04,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-21 01:53:04,437 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.1538461538461537) internal successors, (56), 25 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) Word has length 24 [2021-11-21 01:53:04,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:53:04,440 INFO L225 Difference]: With dead ends: 113 [2021-11-21 01:53:04,440 INFO L226 Difference]: Without dead ends: 113 [2021-11-21 01:53:04,442 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 670 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=324, Invalid=3336, Unknown=0, NotChecked=0, Total=3660 [2021-11-21 01:53:04,444 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 32 mSDsluCounter, 540 mSDsCounter, 0 mSdLazyCounter, 431 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 500 SdHoareTripleChecker+Invalid, 515 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 431 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 70 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:53:04,445 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 500 Invalid, 515 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 431 Invalid, 0 Unknown, 70 Unchecked, 0.3s Time] [2021-11-21 01:53:04,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-11-21 01:53:04,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 103. [2021-11-21 01:53:04,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 92 states have (on average 1.3043478260869565) internal successors, (120), 102 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) [2021-11-21 01:53:04,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 120 transitions. [2021-11-21 01:53:04,457 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 120 transitions. Word has length 24 [2021-11-21 01:53:04,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:53:04,458 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 120 transitions. [2021-11-21 01:53:04,459 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.1538461538461537) internal successors, (56), 25 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) [2021-11-21 01:53:04,459 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 120 transitions. [2021-11-21 01:53:04,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-21 01:53:04,460 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:53:04,460 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:53:04,509 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-21 01:53:04,685 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:53:04,685 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:53:04,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:53:04,685 INFO L85 PathProgramCache]: Analyzing trace with hash -761001242, now seen corresponding path program 2 times [2021-11-21 01:53:04,686 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:53:04,686 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [800612704] [2021-11-21 01:53:04,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:53:04,686 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:53:04,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:53:04,792 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:53:04,792 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:53:04,792 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [800612704] [2021-11-21 01:53:04,793 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [800612704] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:53:04,793 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [968833243] [2021-11-21 01:53:04,793 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:53:04,793 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:53:04,794 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:53:04,795 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:53:04,800 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-21 01:53:04,870 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-21 01:53:04,871 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:53:04,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 56 conjunts are in the unsatisfiable core [2021-11-21 01:53:04,876 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:53:05,007 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 25 treesize of output 21 [2021-11-21 01:53:05,059 INFO L354 Elim1Store]: treesize reduction 38, result has 20.8 percent of original size [2021-11-21 01:53:05,060 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 33 [2021-11-21 01:53:05,408 INFO L354 Elim1Store]: treesize reduction 48, result has 34.2 percent of original size [2021-11-21 01:53:05,408 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 41 treesize of output 45 [2021-11-21 01:53:05,531 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-21 01:53:05,531 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:53:06,719 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-21 01:53:06,738 INFO L354 Elim1Store]: treesize reduction 23, result has 46.5 percent of original size [2021-11-21 01:53:06,738 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 209 treesize of output 176 [2021-11-21 01:53:06,750 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-21 01:53:06,750 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 74 treesize of output 72 [2021-11-21 01:53:06,814 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:53:06,816 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-11-21 01:53:06,834 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:53:06,844 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-21 01:53:06,845 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 47 treesize of output 53 [2021-11-21 01:53:07,077 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-21 01:53:07,077 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [968833243] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:53:07,077 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1890700895] [2021-11-21 01:53:07,082 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-21 01:53:07,083 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:53:07,083 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:53:07,083 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:53:07,084 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:53:07,198 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:07,200 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 01:53:07,326 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:53:07,720 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:07,721 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 198 treesize of output 190 [2021-11-21 01:53:08,128 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:53:08,415 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:53:08,705 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:08,706 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 80 treesize of output 72 [2021-11-21 01:53:08,866 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:53:09,013 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 14 treesize of output 10 [2021-11-21 01:53:09,169 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 01:53:09,169 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-21 01:53:19,596 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:53:24,109 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:53:24,109 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:53:24,109 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9, 9] total 25 [2021-11-21 01:53:24,109 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [576403432] [2021-11-21 01:53:24,109 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:53:24,110 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-21 01:53:24,110 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:53:24,110 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-21 01:53:24,111 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=265, Invalid=1627, Unknown=0, NotChecked=0, Total=1892 [2021-11-21 01:53:24,111 INFO L87 Difference]: Start difference. First operand 103 states and 120 transitions. Second operand has 27 states, 26 states have (on average 2.5) internal successors, (65), 26 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) [2021-11-21 01:53:24,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:53:24,596 INFO L93 Difference]: Finished difference Result 143 states and 167 transitions. [2021-11-21 01:53:24,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-21 01:53:24,597 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 2.5) internal successors, (65), 26 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 25 [2021-11-21 01:53:24,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:53:24,598 INFO L225 Difference]: With dead ends: 143 [2021-11-21 01:53:24,598 INFO L226 Difference]: Without dead ends: 143 [2021-11-21 01:53:24,599 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 610 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=334, Invalid=2318, Unknown=0, NotChecked=0, Total=2652 [2021-11-21 01:53:24,600 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 77 mSDsluCounter, 352 mSDsCounter, 0 mSdLazyCounter, 351 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 77 SdHoareTripleChecker+Valid, 344 SdHoareTripleChecker+Invalid, 423 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 351 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 70 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:53:24,600 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [77 Valid, 344 Invalid, 423 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 351 Invalid, 0 Unknown, 70 Unchecked, 0.2s Time] [2021-11-21 01:53:24,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2021-11-21 01:53:24,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 128. [2021-11-21 01:53:24,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 117 states have (on average 1.3846153846153846) internal successors, (162), 127 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:53:24,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 162 transitions. [2021-11-21 01:53:24,606 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 162 transitions. Word has length 25 [2021-11-21 01:53:24,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:53:24,606 INFO L470 AbstractCegarLoop]: Abstraction has 128 states and 162 transitions. [2021-11-21 01:53:24,607 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 2.5) internal successors, (65), 26 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) [2021-11-21 01:53:24,607 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 162 transitions. [2021-11-21 01:53:24,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-21 01:53:24,608 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:53:24,608 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:53:24,644 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-21 01:53:24,825 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-21 01:53:24,826 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr14REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:53:24,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:53:24,826 INFO L85 PathProgramCache]: Analyzing trace with hash -2116242575, now seen corresponding path program 1 times [2021-11-21 01:53:24,826 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:53:24,826 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [31559863] [2021-11-21 01:53:24,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:53:24,827 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:53:24,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:53:24,887 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-21 01:53:24,888 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:53:24,888 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [31559863] [2021-11-21 01:53:24,888 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [31559863] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:53:24,888 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:53:24,888 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 01:53:24,889 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [143696628] [2021-11-21 01:53:24,889 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:53:24,889 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:53:24,890 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:53:24,890 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:53:24,890 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:53:24,891 INFO L87 Difference]: Start difference. First operand 128 states and 162 transitions. Second operand has 5 states, 4 states have (on average 6.0) internal successors, (24), 5 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) [2021-11-21 01:53:24,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:53:24,959 INFO L93 Difference]: Finished difference Result 135 states and 168 transitions. [2021-11-21 01:53:24,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 01:53:24,960 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 6.0) internal successors, (24), 5 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) Word has length 26 [2021-11-21 01:53:24,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:53:24,961 INFO L225 Difference]: With dead ends: 135 [2021-11-21 01:53:24,962 INFO L226 Difference]: Without dead ends: 135 [2021-11-21 01:53:24,962 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-21 01:53:24,963 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 92 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:53:24,963 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [92 Valid, 37 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:53:24,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-11-21 01:53:24,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 126. [2021-11-21 01:53:24,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 117 states have (on average 1.3504273504273505) internal successors, (158), 125 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:53:24,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 158 transitions. [2021-11-21 01:53:24,977 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 158 transitions. Word has length 26 [2021-11-21 01:53:24,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:53:24,978 INFO L470 AbstractCegarLoop]: Abstraction has 126 states and 158 transitions. [2021-11-21 01:53:24,979 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 6.0) internal successors, (24), 5 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) [2021-11-21 01:53:24,979 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 158 transitions. [2021-11-21 01:53:24,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-21 01:53:24,979 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:53:24,979 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:53:24,980 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-11-21 01:53:24,980 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:53:24,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:53:24,980 INFO L85 PathProgramCache]: Analyzing trace with hash -2116242574, now seen corresponding path program 1 times [2021-11-21 01:53:24,981 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:53:24,981 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2109666183] [2021-11-21 01:53:24,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:53:24,981 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:53:24,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:53:25,092 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:53:25,093 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:53:25,093 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2109666183] [2021-11-21 01:53:25,093 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2109666183] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:53:25,093 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [410573644] [2021-11-21 01:53:25,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:53:25,094 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:53:25,094 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:53:25,095 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:53:25,117 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-21 01:53:25,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:53:25,186 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-21 01:53:25,188 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:53:25,210 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 01:53:25,211 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-21 01:53:25,214 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-21 01:53:25,523 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:53:25,523 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:53:25,838 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:53:25,838 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [410573644] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-21 01:53:25,839 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:53:25,839 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [7, 7] total 21 [2021-11-21 01:53:25,839 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [513689909] [2021-11-21 01:53:25,839 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:53:25,839 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-21 01:53:25,839 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:53:25,840 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-21 01:53:25,840 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=434, Unknown=0, NotChecked=0, Total=506 [2021-11-21 01:53:25,840 INFO L87 Difference]: Start difference. First operand 126 states and 158 transitions. Second operand has 9 states, 8 states have (on average 3.0) internal successors, (24), 8 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) [2021-11-21 01:53:26,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:53:26,158 INFO L93 Difference]: Finished difference Result 217 states and 262 transitions. [2021-11-21 01:53:26,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-21 01:53:26,158 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 3.0) internal successors, (24), 8 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) Word has length 26 [2021-11-21 01:53:26,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:53:26,160 INFO L225 Difference]: With dead ends: 217 [2021-11-21 01:53:26,160 INFO L226 Difference]: Without dead ends: 217 [2021-11-21 01:53:26,161 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 114 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=116, Invalid=696, Unknown=0, NotChecked=0, Total=812 [2021-11-21 01:53:26,162 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 256 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 244 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 256 SdHoareTripleChecker+Valid, 192 SdHoareTripleChecker+Invalid, 258 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 244 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:53:26,162 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [256 Valid, 192 Invalid, 258 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 244 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:53:26,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2021-11-21 01:53:26,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 141. [2021-11-21 01:53:26,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 133 states have (on average 1.3233082706766917) internal successors, (176), 140 states have internal predecessors, (176), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:53:26,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 176 transitions. [2021-11-21 01:53:26,169 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 176 transitions. Word has length 26 [2021-11-21 01:53:26,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:53:26,169 INFO L470 AbstractCegarLoop]: Abstraction has 141 states and 176 transitions. [2021-11-21 01:53:26,169 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 3.0) internal successors, (24), 8 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) [2021-11-21 01:53:26,170 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 176 transitions. [2021-11-21 01:53:26,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-21 01:53:26,170 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:53:26,171 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:53:26,204 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-21 01:53:26,389 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-21 01:53:26,389 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr16REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:53:26,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:53:26,389 INFO L85 PathProgramCache]: Analyzing trace with hash -1179008278, now seen corresponding path program 1 times [2021-11-21 01:53:26,390 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:53:26,390 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [763385992] [2021-11-21 01:53:26,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:53:26,390 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:53:26,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:53:26,460 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-21 01:53:26,460 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:53:26,460 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [763385992] [2021-11-21 01:53:26,461 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [763385992] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:53:26,461 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:53:26,461 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 01:53:26,461 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1692903014] [2021-11-21 01:53:26,461 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:53:26,462 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 01:53:26,462 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:53:26,462 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 01:53:26,463 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:53:26,463 INFO L87 Difference]: Start difference. First operand 141 states and 176 transitions. Second operand has 6 states, 5 states have (on average 5.0) internal successors, (25), 6 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) [2021-11-21 01:53:26,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:53:26,539 INFO L93 Difference]: Finished difference Result 149 states and 184 transitions. [2021-11-21 01:53:26,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:53:26,539 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 5.0) internal successors, (25), 6 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 27 [2021-11-21 01:53:26,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:53:26,541 INFO L225 Difference]: With dead ends: 149 [2021-11-21 01:53:26,541 INFO L226 Difference]: Without dead ends: 149 [2021-11-21 01:53:26,541 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-11-21 01:53:26,543 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 90 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:53:26,543 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [90 Valid, 65 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:53:26,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-11-21 01:53:26,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 140. [2021-11-21 01:53:26,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 133 states have (on average 1.3082706766917294) internal successors, (174), 139 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:53:26,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 174 transitions. [2021-11-21 01:53:26,549 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 174 transitions. Word has length 27 [2021-11-21 01:53:26,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:53:26,549 INFO L470 AbstractCegarLoop]: Abstraction has 140 states and 174 transitions. [2021-11-21 01:53:26,549 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 5.0) internal successors, (25), 6 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) [2021-11-21 01:53:26,550 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 174 transitions. [2021-11-21 01:53:26,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-21 01:53:26,551 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:53:26,551 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:53:26,551 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-11-21 01:53:26,552 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:53:26,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:53:26,552 INFO L85 PathProgramCache]: Analyzing trace with hash -1179008277, now seen corresponding path program 1 times [2021-11-21 01:53:26,552 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:53:26,553 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2073631383] [2021-11-21 01:53:26,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:53:26,553 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:53:26,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:53:26,705 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:53:26,706 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:53:26,706 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2073631383] [2021-11-21 01:53:26,706 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2073631383] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:53:26,706 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1431176064] [2021-11-21 01:53:26,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:53:26,707 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:53:26,707 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:53:26,708 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:53:26,733 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-21 01:53:26,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:53:26,799 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-21 01:53:26,801 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:53:26,986 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:53:26,987 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:53:27,219 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-11-21 01:53:27,238 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:53:27,238 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1431176064] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:53:27,238 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1412306933] [2021-11-21 01:53:27,240 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2021-11-21 01:53:27,241 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:53:27,241 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:53:27,241 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:53:27,241 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:53:27,315 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:27,316 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 01:53:27,631 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 20 treesize of output 16 [2021-11-21 01:53:28,089 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 01:53:28,089 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 180 treesize of output 179 [2021-11-21 01:53:28,575 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:53:28,795 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:53:29,136 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:29,139 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 74 treesize of output 66 [2021-11-21 01:53:29,384 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:53:29,565 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 14 treesize of output 10 [2021-11-21 01:53:29,727 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 01:53:29,727 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-21 01:53:33,517 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:53:36,600 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1412306933] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:53:36,601 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:53:36,601 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [8, 8, 8] total 36 [2021-11-21 01:53:36,601 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [652739254] [2021-11-21 01:53:36,601 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:53:36,602 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-21 01:53:36,602 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:53:36,602 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-21 01:53:36,603 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=215, Invalid=1045, Unknown=0, NotChecked=0, Total=1260 [2021-11-21 01:53:36,603 INFO L87 Difference]: Start difference. First operand 140 states and 174 transitions. Second operand has 19 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 18 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:53:37,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:53:37,415 INFO L93 Difference]: Finished difference Result 133 states and 157 transitions. [2021-11-21 01:53:37,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-21 01:53:37,416 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 18 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2021-11-21 01:53:37,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:53:37,417 INFO L225 Difference]: With dead ends: 133 [2021-11-21 01:53:37,417 INFO L226 Difference]: Without dead ends: 133 [2021-11-21 01:53:37,418 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 325 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=272, Invalid=1210, Unknown=0, NotChecked=0, Total=1482 [2021-11-21 01:53:37,419 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 158 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 330 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 158 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 350 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 330 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 01:53:37,419 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [158 Valid, 112 Invalid, 350 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 330 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 01:53:37,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-11-21 01:53:37,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 130. [2021-11-21 01:53:37,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 123 states have (on average 1.2520325203252032) internal successors, (154), 129 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:53:37,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 154 transitions. [2021-11-21 01:53:37,429 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 154 transitions. Word has length 27 [2021-11-21 01:53:37,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:53:37,429 INFO L470 AbstractCegarLoop]: Abstraction has 130 states and 154 transitions. [2021-11-21 01:53:37,429 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 18 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:53:37,430 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 154 transitions. [2021-11-21 01:53:37,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-21 01:53:37,430 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:53:37,431 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:53:37,477 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-21 01:53:37,645 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-21 01:53:37,645 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:53:37,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:53:37,646 INFO L85 PathProgramCache]: Analyzing trace with hash 733298850, now seen corresponding path program 1 times [2021-11-21 01:53:37,646 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:53:37,646 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1643509790] [2021-11-21 01:53:37,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:53:37,646 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:53:37,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:53:37,900 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 01:53:37,900 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:53:37,900 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1643509790] [2021-11-21 01:53:37,900 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1643509790] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:53:37,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [808813573] [2021-11-21 01:53:37,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:53:37,901 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:53:37,901 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:53:37,902 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:53:37,904 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-21 01:53:37,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:53:37,971 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-21 01:53:37,973 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:53:37,984 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-21 01:53:38,159 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-21 01:53:38,212 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 01:53:38,212 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 41 treesize of output 40 [2021-11-21 01:53:38,784 INFO L354 Elim1Store]: treesize reduction 42, result has 6.7 percent of original size [2021-11-21 01:53:38,784 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 47 treesize of output 32 [2021-11-21 01:53:38,798 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 01:53:38,799 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:53:39,222 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 52 treesize of output 48 [2021-11-21 01:53:39,504 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 01:53:39,505 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [808813573] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:53:39,505 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [795753804] [2021-11-21 01:53:39,507 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-21 01:53:39,507 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:53:39,507 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:53:39,508 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:53:39,508 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:53:39,532 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:39,533 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 01:53:39,813 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 20 treesize of output 16 [2021-11-21 01:53:40,252 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 01:53:40,253 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 180 treesize of output 179 [2021-11-21 01:53:40,707 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:53:40,939 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:53:41,270 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:41,271 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 74 treesize of output 66 [2021-11-21 01:53:41,511 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:53:41,641 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 14 treesize of output 10 [2021-11-21 01:53:41,763 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 01:53:41,763 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-21 01:53:53,241 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:53:58,589 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:53:58,589 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:53:58,590 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 23 [2021-11-21 01:53:58,590 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [524775507] [2021-11-21 01:53:58,590 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:53:58,590 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-21 01:53:58,590 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:53:58,591 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-21 01:53:58,591 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=1413, Unknown=0, NotChecked=0, Total=1560 [2021-11-21 01:53:58,592 INFO L87 Difference]: Start difference. First operand 130 states and 154 transitions. Second operand has 24 states, 24 states have (on average 2.4166666666666665) internal successors, (58), 23 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) [2021-11-21 01:53:58,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:53:58,966 INFO L93 Difference]: Finished difference Result 135 states and 158 transitions. [2021-11-21 01:53:58,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-21 01:53:58,967 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.4166666666666665) internal successors, (58), 23 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 27 [2021-11-21 01:53:58,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:53:58,968 INFO L225 Difference]: With dead ends: 135 [2021-11-21 01:53:58,969 INFO L226 Difference]: Without dead ends: 95 [2021-11-21 01:53:58,970 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 567 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=220, Invalid=2036, Unknown=0, NotChecked=0, Total=2256 [2021-11-21 01:53:58,971 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 39 mSDsluCounter, 340 mSDsCounter, 0 mSdLazyCounter, 140 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 318 SdHoareTripleChecker+Invalid, 207 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 140 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 60 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:53:58,971 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 318 Invalid, 207 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 140 Invalid, 0 Unknown, 60 Unchecked, 0.1s Time] [2021-11-21 01:53:58,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-11-21 01:53:58,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 94. [2021-11-21 01:53:58,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 87 states have (on average 1.2873563218390804) internal successors, (112), 93 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) [2021-11-21 01:53:58,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 112 transitions. [2021-11-21 01:53:58,975 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 112 transitions. Word has length 27 [2021-11-21 01:53:58,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:53:58,976 INFO L470 AbstractCegarLoop]: Abstraction has 94 states and 112 transitions. [2021-11-21 01:53:58,976 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.4166666666666665) internal successors, (58), 23 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) [2021-11-21 01:53:58,976 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 112 transitions. [2021-11-21 01:53:58,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-21 01:53:58,977 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:53:58,977 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:53:59,026 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-21 01:53:59,192 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-21 01:53:59,193 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:53:59,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:53:59,193 INFO L85 PathProgramCache]: Analyzing trace with hash 2141288174, now seen corresponding path program 3 times [2021-11-21 01:53:59,193 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:53:59,193 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [135370901] [2021-11-21 01:53:59,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:53:59,194 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:53:59,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:53:59,602 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:53:59,602 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:53:59,602 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [135370901] [2021-11-21 01:53:59,602 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [135370901] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:53:59,602 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1963860760] [2021-11-21 01:53:59,603 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:53:59,603 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:53:59,603 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:53:59,604 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:53:59,638 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-21 01:53:59,709 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:53:59,709 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:53:59,712 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 72 conjunts are in the unsatisfiable core [2021-11-21 01:53:59,714 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:53:59,993 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 21 treesize of output 17 [2021-11-21 01:54:00,094 INFO L354 Elim1Store]: treesize reduction 38, result has 20.8 percent of original size [2021-11-21 01:54:00,095 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 29 [2021-11-21 01:54:00,524 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-11-21 01:54:00,532 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:54:00,532 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:54:02,742 WARN L838 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_main_~nondetString2~0#1.base| Int) (|ULTIMATE.start_main_~length2~0#1| Int)) (let ((.cse0 (store (select |c_#memory_int| |ULTIMATE.start_main_~nondetString2~0#1.base|) (+ (- 1) |c_ULTIMATE.start_main_~nondetString2~0#1.offset| |ULTIMATE.start_main_~length2~0#1|) 0))) (or (= (select (select (store |c_#memory_int| |ULTIMATE.start_main_~nondetString2~0#1.base| .cse0) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 1)) 0) (not (= (select .cse0 (+ |c_ULTIMATE.start_main_~nondetString2~0#1.offset| 1)) 0))))) is different from false [2021-11-21 01:54:02,762 INFO L354 Elim1Store]: treesize reduction 29, result has 43.1 percent of original size [2021-11-21 01:54:02,763 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 83 treesize of output 87 [2021-11-21 01:54:02,777 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-21 01:54:02,778 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 51 treesize of output 53 [2021-11-21 01:54:02,810 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 23 [2021-11-21 01:54:02,820 INFO L354 Elim1Store]: treesize reduction 12, result has 7.7 percent of original size [2021-11-21 01:54:02,821 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 17 treesize of output 8 [2021-11-21 01:54:03,065 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:54:03,066 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1963860760] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:54:03,066 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [218173086] [2021-11-21 01:54:03,068 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-21 01:54:03,068 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:54:03,068 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:54:03,068 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:54:03,069 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:54:03,102 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:03,103 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 01:54:03,385 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:54:03,873 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:03,874 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 198 treesize of output 190 [2021-11-21 01:54:04,140 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:54:04,411 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 20 treesize of output 16 [2021-11-21 01:54:04,662 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 01:54:04,663 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 87 treesize of output 86 [2021-11-21 01:54:05,059 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:54:05,290 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 14 treesize of output 10 [2021-11-21 01:54:05,408 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 01:54:05,409 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-21 01:54:16,299 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:54:21,220 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:54:21,220 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:54:21,220 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 14, 14] total 34 [2021-11-21 01:54:21,220 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1091502635] [2021-11-21 01:54:21,220 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:54:21,221 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-21 01:54:21,221 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:54:21,221 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-21 01:54:21,222 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=201, Invalid=2352, Unknown=1, NotChecked=98, Total=2652 [2021-11-21 01:54:21,222 INFO L87 Difference]: Start difference. First operand 94 states and 112 transitions. Second operand has 35 states, 35 states have (on average 1.9714285714285715) internal successors, (69), 34 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) [2021-11-21 01:54:23,538 WARN L838 $PredicateComparison]: unable to prove that (and (< 1 |c_ULTIMATE.start_main_~length1~0#1|) (exists ((|ULTIMATE.start_main_~length1~0#1| Int)) (and (< 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2) (= (select (select |c_#memory_int| |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ (- 1) |c_ULTIMATE.start_main_~nondetString1~0#1.offset| |ULTIMATE.start_main_~length1~0#1|)) 0))) (<= |c_ULTIMATE.start_main_~length1~0#1| 2) (not (= |c_ULTIMATE.start_main_~nondetString2~0#1.base| |c_ULTIMATE.start_main_~nondetString1~0#1.base|)) (= |c_ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |c_ULTIMATE.start_main_~i~0#1| 2) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| (store (select |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base|) (+ (- 1) |c_ULTIMATE.start_main_~nondetString2~0#1.offset| |c_ULTIMATE.start_main_~length2~0#1|) 0)) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) 1) 0) (forall ((|ULTIMATE.start_main_~nondetString2~0#1.base| Int) (|ULTIMATE.start_main_~length2~0#1| Int)) (let ((.cse0 (store (select |c_#memory_int| |ULTIMATE.start_main_~nondetString2~0#1.base|) (+ (- 1) |c_ULTIMATE.start_main_~nondetString2~0#1.offset| |ULTIMATE.start_main_~length2~0#1|) 0))) (or (= (select (select (store |c_#memory_int| |ULTIMATE.start_main_~nondetString2~0#1.base| .cse0) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 1)) 0) (not (= (select .cse0 (+ |c_ULTIMATE.start_main_~nondetString2~0#1.offset| 1)) 0))))) (= |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= 2 (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| |c_ULTIMATE.start_main_~length1~0#1|))) is different from false [2021-11-21 01:54:23,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:54:23,692 INFO L93 Difference]: Finished difference Result 146 states and 172 transitions. [2021-11-21 01:54:23,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-21 01:54:23,693 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.9714285714285715) internal successors, (69), 34 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2021-11-21 01:54:23,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:54:23,693 INFO L225 Difference]: With dead ends: 146 [2021-11-21 01:54:23,694 INFO L226 Difference]: Without dead ends: 126 [2021-11-21 01:54:23,695 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 45 SyntacticMatches, 2 SemanticMatches, 58 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 840 ImplicationChecksByTransitivity, 10.1s TimeCoverageRelationStatistics Valid=255, Invalid=3057, Unknown=2, NotChecked=226, Total=3540 [2021-11-21 01:54:23,696 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 52 mSDsluCounter, 617 mSDsCounter, 0 mSdLazyCounter, 274 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 561 SdHoareTripleChecker+Invalid, 386 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 274 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 103 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:54:23,696 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 561 Invalid, 386 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 274 Invalid, 0 Unknown, 103 Unchecked, 0.2s Time] [2021-11-21 01:54:23,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-11-21 01:54:23,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2021-11-21 01:54:23,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 118 states have (on average 1.2457627118644068) internal successors, (147), 124 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:54:23,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 147 transitions. [2021-11-21 01:54:23,701 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 147 transitions. Word has length 29 [2021-11-21 01:54:23,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:54:23,702 INFO L470 AbstractCegarLoop]: Abstraction has 125 states and 147 transitions. [2021-11-21 01:54:23,702 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.9714285714285715) internal successors, (69), 34 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) [2021-11-21 01:54:23,702 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 147 transitions. [2021-11-21 01:54:23,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-21 01:54:23,703 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:54:23,703 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:54:23,744 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2021-11-21 01:54:23,921 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:54:23,921 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:54:23,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:54:23,921 INFO L85 PathProgramCache]: Analyzing trace with hash 1537708518, now seen corresponding path program 2 times [2021-11-21 01:54:23,922 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:54:23,922 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [878568817] [2021-11-21 01:54:23,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:54:23,922 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:54:23,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:54:24,039 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 01:54:24,039 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:54:24,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [878568817] [2021-11-21 01:54:24,040 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [878568817] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:54:24,040 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1589542014] [2021-11-21 01:54:24,040 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:54:24,040 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:54:24,040 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:54:24,044 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:54:24,045 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-21 01:54:24,131 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-21 01:54:24,132 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:54:24,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 56 conjunts are in the unsatisfiable core [2021-11-21 01:54:24,136 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:54:24,246 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 27 treesize of output 23 [2021-11-21 01:54:24,311 INFO L354 Elim1Store]: treesize reduction 38, result has 20.8 percent of original size [2021-11-21 01:54:24,311 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 36 treesize of output 35 [2021-11-21 01:54:24,717 INFO L354 Elim1Store]: treesize reduction 48, result has 34.2 percent of original size [2021-11-21 01:54:24,717 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 41 treesize of output 45 [2021-11-21 01:54:24,856 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 01:54:24,856 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:54:25,730 INFO L354 Elim1Store]: treesize reduction 23, result has 46.5 percent of original size [2021-11-21 01:54:25,730 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 228 treesize of output 195 [2021-11-21 01:54:25,742 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-21 01:54:25,742 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 93 treesize of output 91 [2021-11-21 01:54:25,751 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 87 [2021-11-21 01:54:25,768 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 26 [2021-11-21 01:54:25,848 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:54:25,860 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-21 01:54:25,860 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 47 treesize of output 53 [2021-11-21 01:54:26,077 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 01:54:26,077 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1589542014] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:54:26,077 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1822153222] [2021-11-21 01:54:26,080 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-21 01:54:26,080 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:54:26,080 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:54:26,081 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:54:26,081 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:54:26,196 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:26,198 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 01:54:26,417 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:54:26,934 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:26,935 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 198 treesize of output 190 [2021-11-21 01:54:27,287 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:54:27,497 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 20 treesize of output 16 [2021-11-21 01:54:27,816 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 01:54:27,816 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 87 treesize of output 86 [2021-11-21 01:54:28,027 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:54:28,198 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 14 treesize of output 10 [2021-11-21 01:54:28,318 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 01:54:28,318 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-21 01:54:39,894 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:54:45,495 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:54:45,495 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:54:45,495 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9, 9] total 25 [2021-11-21 01:54:45,496 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [677190617] [2021-11-21 01:54:45,496 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:54:45,496 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-21 01:54:45,496 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:54:45,497 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-21 01:54:45,498 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=1584, Unknown=0, NotChecked=0, Total=1806 [2021-11-21 01:54:45,498 INFO L87 Difference]: Start difference. First operand 125 states and 147 transitions. Second operand has 27 states, 26 states have (on average 2.6153846153846154) internal successors, (68), 26 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:54:45,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:54:45,921 INFO L93 Difference]: Finished difference Result 147 states and 172 transitions. [2021-11-21 01:54:45,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-21 01:54:45,921 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 2.6153846153846154) internal successors, (68), 26 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2021-11-21 01:54:45,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:54:45,922 INFO L225 Difference]: With dead ends: 147 [2021-11-21 01:54:45,922 INFO L226 Difference]: Without dead ends: 147 [2021-11-21 01:54:45,924 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 560 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=282, Invalid=2168, Unknown=0, NotChecked=0, Total=2450 [2021-11-21 01:54:45,924 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 170 mSDsluCounter, 269 mSDsCounter, 0 mSdLazyCounter, 276 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 170 SdHoareTripleChecker+Valid, 267 SdHoareTripleChecker+Invalid, 328 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 276 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 48 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:54:45,924 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [170 Valid, 267 Invalid, 328 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 276 Invalid, 0 Unknown, 48 Unchecked, 0.2s Time] [2021-11-21 01:54:45,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2021-11-21 01:54:45,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 134. [2021-11-21 01:54:45,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 127 states have (on average 1.2992125984251968) internal successors, (165), 133 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) [2021-11-21 01:54:45,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 165 transitions. [2021-11-21 01:54:45,930 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 165 transitions. Word has length 29 [2021-11-21 01:54:45,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:54:45,930 INFO L470 AbstractCegarLoop]: Abstraction has 134 states and 165 transitions. [2021-11-21 01:54:45,931 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 2.6153846153846154) internal successors, (68), 26 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:54:45,931 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 165 transitions. [2021-11-21 01:54:45,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-21 01:54:45,932 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:54:45,932 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:54:45,961 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-21 01:54:46,141 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-11-21 01:54:46,142 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:54:46,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:54:46,142 INFO L85 PathProgramCache]: Analyzing trace with hash 2084865842, now seen corresponding path program 4 times [2021-11-21 01:54:46,142 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:54:46,142 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1697565237] [2021-11-21 01:54:46,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:54:46,143 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:54:46,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:54:46,298 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 15 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:54:46,298 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:54:46,298 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1697565237] [2021-11-21 01:54:46,299 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1697565237] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:54:46,299 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1519847613] [2021-11-21 01:54:46,299 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:54:46,299 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:54:46,299 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:54:46,302 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:54:46,313 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-21 01:54:46,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:54:46,398 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-21 01:54:46,399 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:54:46,419 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 01:54:46,419 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-21 01:54:46,423 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-21 01:54:46,846 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:54:46,846 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:54:47,287 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 9 proven. 8 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:54:47,287 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1519847613] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:54:47,288 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [6653915] [2021-11-21 01:54:47,289 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-21 01:54:47,289 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:54:47,289 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:54:47,290 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:54:47,290 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:54:47,357 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:47,358 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 01:54:47,577 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 20 treesize of output 16 [2021-11-21 01:54:47,971 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 01:54:47,971 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 180 treesize of output 179 [2021-11-21 01:54:48,433 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:54:48,719 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 20 treesize of output 16 [2021-11-21 01:54:49,050 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 01:54:49,050 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 69 treesize of output 68 [2021-11-21 01:54:49,329 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:54:49,540 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 14 treesize of output 10 [2021-11-21 01:54:49,630 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 01:54:49,630 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-21 01:55:00,916 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:55:05,741 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:55:05,741 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:55:05,741 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 27 [2021-11-21 01:55:05,741 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1590996526] [2021-11-21 01:55:05,741 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:55:05,742 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-21 01:55:05,742 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:55:05,743 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-21 01:55:05,744 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=201, Invalid=1869, Unknown=0, NotChecked=0, Total=2070 [2021-11-21 01:55:05,744 INFO L87 Difference]: Start difference. First operand 134 states and 165 transitions. Second operand has 29 states, 28 states have (on average 3.107142857142857) internal successors, (87), 28 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:55:06,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:55:06,529 INFO L93 Difference]: Finished difference Result 219 states and 267 transitions. [2021-11-21 01:55:06,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-21 01:55:06,530 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 3.107142857142857) internal successors, (87), 28 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2021-11-21 01:55:06,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:55:06,531 INFO L225 Difference]: With dead ends: 219 [2021-11-21 01:55:06,531 INFO L226 Difference]: Without dead ends: 219 [2021-11-21 01:55:06,533 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 743 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=382, Invalid=2810, Unknown=0, NotChecked=0, Total=3192 [2021-11-21 01:55:06,533 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 332 mSDsluCounter, 604 mSDsCounter, 0 mSdLazyCounter, 777 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 332 SdHoareTripleChecker+Valid, 567 SdHoareTripleChecker+Invalid, 794 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 777 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 01:55:06,534 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [332 Valid, 567 Invalid, 794 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 777 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 01:55:06,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2021-11-21 01:55:06,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 167. [2021-11-21 01:55:06,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 160 states have (on average 1.33125) internal successors, (213), 166 states have internal predecessors, (213), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:55:06,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 213 transitions. [2021-11-21 01:55:06,541 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 213 transitions. Word has length 31 [2021-11-21 01:55:06,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:55:06,541 INFO L470 AbstractCegarLoop]: Abstraction has 167 states and 213 transitions. [2021-11-21 01:55:06,541 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 3.107142857142857) internal successors, (87), 28 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:55:06,542 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 213 transitions. [2021-11-21 01:55:06,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-21 01:55:06,542 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:55:06,543 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:55:06,599 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-21 01:55:06,769 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:55:06,769 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:55:06,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:55:06,769 INFO L85 PathProgramCache]: Analyzing trace with hash 267880939, now seen corresponding path program 1 times [2021-11-21 01:55:06,770 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:55:06,770 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2136644564] [2021-11-21 01:55:06,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:55:06,770 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:55:06,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:55:06,971 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-21 01:55:06,971 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:55:06,971 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2136644564] [2021-11-21 01:55:06,971 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2136644564] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:55:06,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1167434350] [2021-11-21 01:55:06,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:55:06,972 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:55:06,972 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:55:06,977 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:55:06,997 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-21 01:55:07,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:55:07,068 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-21 01:55:07,069 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:55:07,273 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-21 01:55:07,273 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:55:07,481 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-11-21 01:55:07,519 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-21 01:55:07,519 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1167434350] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:55:07,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [109281675] [2021-11-21 01:55:07,521 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2021-11-21 01:55:07,522 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:55:07,522 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:55:07,522 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:55:07,522 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:55:07,552 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:07,553 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 01:55:07,852 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:55:08,198 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:08,199 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 198 treesize of output 190 [2021-11-21 01:55:08,510 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:55:08,706 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 20 treesize of output 16 [2021-11-21 01:55:09,004 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 01:55:09,004 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 87 treesize of output 86 [2021-11-21 01:55:09,393 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:55:09,535 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 14 treesize of output 10 [2021-11-21 01:55:09,792 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 01:55:09,792 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-21 01:55:17,174 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:55:21,566 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:55:21,566 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:55:21,566 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 21 [2021-11-21 01:55:21,566 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [136217676] [2021-11-21 01:55:21,567 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:55:21,567 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-21 01:55:21,567 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:55:21,567 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-21 01:55:21,568 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=198, Invalid=1442, Unknown=0, NotChecked=0, Total=1640 [2021-11-21 01:55:21,568 INFO L87 Difference]: Start difference. First operand 167 states and 213 transitions. Second operand has 22 states, 21 states have (on average 3.0476190476190474) internal successors, (64), 22 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) [2021-11-21 01:55:22,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:55:22,490 INFO L93 Difference]: Finished difference Result 324 states and 410 transitions. [2021-11-21 01:55:22,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-21 01:55:22,491 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 3.0476190476190474) internal successors, (64), 22 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 31 [2021-11-21 01:55:22,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:55:22,492 INFO L225 Difference]: With dead ends: 324 [2021-11-21 01:55:22,492 INFO L226 Difference]: Without dead ends: 324 [2021-11-21 01:55:22,494 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 698 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=476, Invalid=2604, Unknown=0, NotChecked=0, Total=3080 [2021-11-21 01:55:22,494 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 567 mSDsluCounter, 292 mSDsCounter, 0 mSdLazyCounter, 400 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 567 SdHoareTripleChecker+Valid, 295 SdHoareTripleChecker+Invalid, 436 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 400 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:55:22,495 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [567 Valid, 295 Invalid, 436 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 400 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:55:22,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 324 states. [2021-11-21 01:55:22,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 324 to 243. [2021-11-21 01:55:22,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 243 states, 236 states have (on average 1.4194915254237288) internal successors, (335), 242 states have internal predecessors, (335), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:55:22,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 243 states to 243 states and 335 transitions. [2021-11-21 01:55:22,504 INFO L78 Accepts]: Start accepts. Automaton has 243 states and 335 transitions. Word has length 31 [2021-11-21 01:55:22,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:55:22,504 INFO L470 AbstractCegarLoop]: Abstraction has 243 states and 335 transitions. [2021-11-21 01:55:22,505 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 3.0476190476190474) internal successors, (64), 22 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) [2021-11-21 01:55:22,505 INFO L276 IsEmpty]: Start isEmpty. Operand 243 states and 335 transitions. [2021-11-21 01:55:22,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-21 01:55:22,506 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:55:22,506 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:55:22,549 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-21 01:55:22,729 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:55:22,729 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:55:22,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:55:22,729 INFO L85 PathProgramCache]: Analyzing trace with hash 206291110, now seen corresponding path program 1 times [2021-11-21 01:55:22,730 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:55:22,730 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1068408729] [2021-11-21 01:55:22,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:55:22,730 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:55:22,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:55:22,878 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:55:22,879 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:55:22,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1068408729] [2021-11-21 01:55:22,879 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1068408729] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:55:22,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [14957339] [2021-11-21 01:55:22,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:55:22,879 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:55:22,879 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:55:22,881 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:55:22,909 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-21 01:55:22,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:55:22,971 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-21 01:55:22,973 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:55:22,991 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 01:55:22,992 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-21 01:55:22,995 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-21 01:55:23,377 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:55:23,377 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:55:23,788 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:55:23,788 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [14957339] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:55:23,788 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1539772310] [2021-11-21 01:55:23,789 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2021-11-21 01:55:23,790 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:55:23,790 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:55:23,790 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:55:23,790 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:55:23,925 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:23,927 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 01:55:24,121 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 20 treesize of output 16 [2021-11-21 01:55:24,513 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 01:55:24,513 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 180 treesize of output 179 [2021-11-21 01:55:25,039 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:55:25,335 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:55:25,546 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:25,546 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 74 treesize of output 66 [2021-11-21 01:55:25,811 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:55:26,010 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 14 treesize of output 10 [2021-11-21 01:55:26,144 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 01:55:26,144 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-21 01:55:37,262 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:55:41,219 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1539772310] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:55:41,219 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:55:41,219 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [9, 9, 9] total 46 [2021-11-21 01:55:41,219 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2105008811] [2021-11-21 01:55:41,219 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:55:41,220 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-21 01:55:41,220 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:55:41,220 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-21 01:55:41,220 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=204, Invalid=1958, Unknown=0, NotChecked=0, Total=2162 [2021-11-21 01:55:41,221 INFO L87 Difference]: Start difference. First operand 243 states and 335 transitions. Second operand has 20 states, 20 states have (on average 1.15) internal successors, (23), 19 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:55:45,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:55:45,727 INFO L93 Difference]: Finished difference Result 262 states and 335 transitions. [2021-11-21 01:55:45,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-21 01:55:45,727 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.15) internal successors, (23), 19 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-11-21 01:55:45,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:55:45,728 INFO L225 Difference]: With dead ends: 262 [2021-11-21 01:55:45,729 INFO L226 Difference]: Without dead ends: 262 [2021-11-21 01:55:45,729 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 697 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=342, Invalid=2850, Unknown=0, NotChecked=0, Total=3192 [2021-11-21 01:55:45,730 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 153 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 461 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 153 SdHoareTripleChecker+Valid, 145 SdHoareTripleChecker+Invalid, 492 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 461 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-21 01:55:45,730 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [153 Valid, 145 Invalid, 492 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 461 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-21 01:55:45,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 262 states. [2021-11-21 01:55:45,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 262 to 213. [2021-11-21 01:55:45,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 213 states, 206 states have (on average 1.3689320388349515) internal successors, (282), 212 states have internal predecessors, (282), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:55:45,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 282 transitions. [2021-11-21 01:55:45,736 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 282 transitions. Word has length 32 [2021-11-21 01:55:45,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:55:45,737 INFO L470 AbstractCegarLoop]: Abstraction has 213 states and 282 transitions. [2021-11-21 01:55:45,737 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.15) internal successors, (23), 19 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:55:45,737 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 282 transitions. [2021-11-21 01:55:45,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-21 01:55:45,738 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:55:45,738 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:55:45,766 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2021-11-21 01:55:45,961 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-11-21 01:55:45,961 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr22REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:55:45,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:55:45,961 INFO L85 PathProgramCache]: Analyzing trace with hash -264452917, now seen corresponding path program 1 times [2021-11-21 01:55:45,962 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:55:45,962 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1893597496] [2021-11-21 01:55:45,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:55:45,962 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:55:45,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:55:46,018 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 01:55:46,019 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:55:46,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1893597496] [2021-11-21 01:55:46,019 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1893597496] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:55:46,019 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:55:46,019 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 01:55:46,020 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [687532815] [2021-11-21 01:55:46,020 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:55:46,020 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 01:55:46,020 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:55:46,020 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 01:55:46,021 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:55:46,021 INFO L87 Difference]: Start difference. First operand 213 states and 282 transitions. Second operand has 6 states, 5 states have (on average 5.6) internal successors, (28), 6 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) [2021-11-21 01:55:46,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:55:46,101 INFO L93 Difference]: Finished difference Result 237 states and 306 transitions. [2021-11-21 01:55:46,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:55:46,101 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 5.6) internal successors, (28), 6 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 33 [2021-11-21 01:55:46,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:55:46,104 INFO L225 Difference]: With dead ends: 237 [2021-11-21 01:55:46,104 INFO L226 Difference]: Without dead ends: 237 [2021-11-21 01:55:46,104 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-11-21 01:55:46,105 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 82 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:55:46,105 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [82 Valid, 60 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:55:46,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2021-11-21 01:55:46,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 212. [2021-11-21 01:55:46,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 212 states, 206 states have (on average 1.3398058252427185) internal successors, (276), 211 states have internal predecessors, (276), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:55:46,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 276 transitions. [2021-11-21 01:55:46,112 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 276 transitions. Word has length 33 [2021-11-21 01:55:46,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:55:46,113 INFO L470 AbstractCegarLoop]: Abstraction has 212 states and 276 transitions. [2021-11-21 01:55:46,113 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 5.6) internal successors, (28), 6 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) [2021-11-21 01:55:46,113 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 276 transitions. [2021-11-21 01:55:46,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-21 01:55:46,114 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:55:46,114 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:55:46,114 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2021-11-21 01:55:46,115 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr23REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:55:46,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:55:46,115 INFO L85 PathProgramCache]: Analyzing trace with hash -264452916, now seen corresponding path program 1 times [2021-11-21 01:55:46,115 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:55:46,115 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [622033728] [2021-11-21 01:55:46,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:55:46,116 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:55:46,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:55:46,205 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 01:55:46,205 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:55:46,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [622033728] [2021-11-21 01:55:46,206 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [622033728] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:55:46,206 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:55:46,206 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-21 01:55:46,206 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1624199467] [2021-11-21 01:55:46,207 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:55:46,207 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 01:55:46,207 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:55:46,208 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 01:55:46,208 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-21 01:55:46,208 INFO L87 Difference]: Start difference. First operand 212 states and 276 transitions. Second operand has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 7 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:55:46,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:55:46,391 INFO L93 Difference]: Finished difference Result 258 states and 324 transitions. [2021-11-21 01:55:46,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-21 01:55:46,391 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 7 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2021-11-21 01:55:46,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:55:46,393 INFO L225 Difference]: With dead ends: 258 [2021-11-21 01:55:46,393 INFO L226 Difference]: Without dead ends: 258 [2021-11-21 01:55:46,394 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2021-11-21 01:55:46,394 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 58 mSDsluCounter, 129 mSDsCounter, 0 mSdLazyCounter, 138 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 125 SdHoareTripleChecker+Invalid, 143 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 138 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:55:46,394 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 125 Invalid, 143 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 138 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:55:46,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2021-11-21 01:55:46,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 211. [2021-11-21 01:55:46,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 211 states, 206 states have (on average 1.3106796116504855) internal successors, (270), 210 states have internal predecessors, (270), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:55:46,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 270 transitions. [2021-11-21 01:55:46,402 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 270 transitions. Word has length 33 [2021-11-21 01:55:46,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:55:46,403 INFO L470 AbstractCegarLoop]: Abstraction has 211 states and 270 transitions. [2021-11-21 01:55:46,403 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 7 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:55:46,403 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 270 transitions. [2021-11-21 01:55:46,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-21 01:55:46,404 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:55:46,404 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:55:46,405 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2021-11-21 01:55:46,405 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:55:46,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:55:46,406 INFO L85 PathProgramCache]: Analyzing trace with hash 1032420846, now seen corresponding path program 3 times [2021-11-21 01:55:46,406 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:55:46,406 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1818705927] [2021-11-21 01:55:46,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:55:46,406 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:55:46,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:55:46,795 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 01:55:46,795 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:55:46,795 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1818705927] [2021-11-21 01:55:46,796 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1818705927] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:55:46,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1877588902] [2021-11-21 01:55:46,796 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:55:46,796 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:55:46,796 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:55:46,801 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:55:46,821 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-21 01:55:46,880 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:55:46,880 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:55:46,882 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 60 conjunts are in the unsatisfiable core [2021-11-21 01:55:46,883 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:55:46,896 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-21 01:55:47,142 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-21 01:55:47,203 INFO L354 Elim1Store]: treesize reduction 38, result has 20.8 percent of original size [2021-11-21 01:55:47,203 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 33 [2021-11-21 01:55:47,618 INFO L354 Elim1Store]: treesize reduction 38, result has 7.3 percent of original size [2021-11-21 01:55:47,618 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 36 treesize of output 23 [2021-11-21 01:55:47,626 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 01:55:47,626 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:55:48,527 WARN L838 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_main_~length2~0#1| Int)) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| (store (select |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base|) (+ (- 1) |c_ULTIMATE.start_main_~nondetString2~0#1.offset| |ULTIMATE.start_main_~length2~0#1|) 0)) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 1)) 0)) is different from false [2021-11-21 01:55:48,531 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 56 treesize of output 50 [2021-11-21 01:55:48,669 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 01:55:48,669 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1877588902] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:55:48,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2127275037] [2021-11-21 01:55:48,670 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-21 01:55:48,670 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:55:48,671 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:55:48,671 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:55:48,671 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:55:48,759 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:48,760 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 01:55:48,945 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:55:49,237 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:49,238 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 198 treesize of output 190 [2021-11-21 01:55:49,505 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:55:49,683 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:55:49,890 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:49,890 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 80 treesize of output 72 [2021-11-21 01:55:50,128 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:55:50,249 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 14 treesize of output 10 [2021-11-21 01:55:50,360 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 01:55:50,360 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-21 01:56:00,182 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:56:05,187 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:56:05,187 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:56:05,187 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 11] total 31 [2021-11-21 01:56:05,187 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2021986988] [2021-11-21 01:56:05,187 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:56:05,188 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-21 01:56:05,188 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:56:05,188 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-21 01:56:05,189 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=1991, Unknown=1, NotChecked=90, Total=2256 [2021-11-21 01:56:05,189 INFO L87 Difference]: Start difference. First operand 211 states and 270 transitions. Second operand has 32 states, 32 states have (on average 2.375) internal successors, (76), 31 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:56:07,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:56:07,402 INFO L93 Difference]: Finished difference Result 218 states and 276 transitions. [2021-11-21 01:56:07,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-21 01:56:07,403 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.375) internal successors, (76), 31 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2021-11-21 01:56:07,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:56:07,404 INFO L225 Difference]: With dead ends: 218 [2021-11-21 01:56:07,404 INFO L226 Difference]: Without dead ends: 212 [2021-11-21 01:56:07,405 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 761 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=213, Invalid=2340, Unknown=1, NotChecked=98, Total=2652 [2021-11-21 01:56:07,406 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 50 mSDsluCounter, 780 mSDsCounter, 0 mSdLazyCounter, 323 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 684 SdHoareTripleChecker+Invalid, 592 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 323 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 261 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:56:07,406 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 684 Invalid, 592 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 323 Invalid, 0 Unknown, 261 Unchecked, 0.2s Time] [2021-11-21 01:56:07,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2021-11-21 01:56:07,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 211. [2021-11-21 01:56:07,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 211 states, 206 states have (on average 1.3009708737864079) internal successors, (268), 210 states have internal predecessors, (268), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:56:07,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 268 transitions. [2021-11-21 01:56:07,413 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 268 transitions. Word has length 33 [2021-11-21 01:56:07,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:56:07,414 INFO L470 AbstractCegarLoop]: Abstraction has 211 states and 268 transitions. [2021-11-21 01:56:07,414 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 2.375) internal successors, (76), 31 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:56:07,414 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 268 transitions. [2021-11-21 01:56:07,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-21 01:56:07,415 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:56:07,415 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:56:07,456 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-21 01:56:07,629 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-11-21 01:56:07,629 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr20REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:56:07,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:56:07,630 INFO L85 PathProgramCache]: Analyzing trace with hash 391886083, now seen corresponding path program 1 times [2021-11-21 01:56:07,630 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:56:07,630 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [127811996] [2021-11-21 01:56:07,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:56:07,630 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:56:07,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:56:07,664 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 01:56:07,664 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:56:07,664 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [127811996] [2021-11-21 01:56:07,665 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [127811996] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:56:07,665 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:56:07,665 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 01:56:07,665 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1038189192] [2021-11-21 01:56:07,665 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:56:07,666 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:56:07,667 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:56:07,667 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:56:07,667 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:56:07,667 INFO L87 Difference]: Start difference. First operand 211 states and 268 transitions. Second operand has 5 states, 4 states have (on average 6.75) internal successors, (27), 5 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:56:07,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:56:07,749 INFO L93 Difference]: Finished difference Result 233 states and 289 transitions. [2021-11-21 01:56:07,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:56:07,750 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 6.75) internal successors, (27), 5 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2021-11-21 01:56:07,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:56:07,752 INFO L225 Difference]: With dead ends: 233 [2021-11-21 01:56:07,752 INFO L226 Difference]: Without dead ends: 233 [2021-11-21 01:56:07,752 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-21 01:56:07,753 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 22 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:56:07,754 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 109 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 79 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:56:07,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2021-11-21 01:56:07,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 210. [2021-11-21 01:56:07,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 210 states, 206 states have (on average 1.2864077669902914) internal successors, (265), 209 states have internal predecessors, (265), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:56:07,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 265 transitions. [2021-11-21 01:56:07,761 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 265 transitions. Word has length 34 [2021-11-21 01:56:07,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:56:07,762 INFO L470 AbstractCegarLoop]: Abstraction has 210 states and 265 transitions. [2021-11-21 01:56:07,762 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 6.75) internal successors, (27), 5 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:56:07,762 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 265 transitions. [2021-11-21 01:56:07,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-21 01:56:07,763 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:56:07,763 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:56:07,764 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2021-11-21 01:56:07,764 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr21REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:56:07,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:56:07,764 INFO L85 PathProgramCache]: Analyzing trace with hash 391886084, now seen corresponding path program 1 times [2021-11-21 01:56:07,764 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:56:07,765 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [423648834] [2021-11-21 01:56:07,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:56:07,765 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:56:07,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:56:07,971 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-21 01:56:07,971 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:56:07,971 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [423648834] [2021-11-21 01:56:07,972 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [423648834] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:56:07,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [666241865] [2021-11-21 01:56:07,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:56:07,972 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:56:07,972 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:56:07,974 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:56:07,996 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-21 01:56:08,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:56:08,061 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-21 01:56:08,062 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:56:08,313 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-21 01:56:08,313 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:56:08,622 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-11-21 01:56:08,668 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-21 01:56:08,668 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [666241865] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:56:08,668 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [463657045] [2021-11-21 01:56:08,670 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-21 01:56:08,670 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:56:08,671 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:56:08,671 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:56:08,671 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:56:08,733 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:56:08,733 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 01:56:08,894 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:56:09,286 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:56:09,287 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 198 treesize of output 190 [2021-11-21 01:56:09,510 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:56:09,691 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 20 treesize of output 16 [2021-11-21 01:56:09,947 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 01:56:09,947 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 87 treesize of output 86 [2021-11-21 01:56:10,330 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:56:10,475 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 14 treesize of output 10 [2021-11-21 01:56:10,610 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 01:56:10,611 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-21 01:56:18,554 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:56:23,558 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [463657045] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:56:23,558 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:56:23,558 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [10, 10, 10] total 44 [2021-11-21 01:56:23,559 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [66509193] [2021-11-21 01:56:23,559 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:56:23,559 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-21 01:56:23,559 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:56:23,560 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-21 01:56:23,560 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=1744, Unknown=0, NotChecked=0, Total=1980 [2021-11-21 01:56:23,560 INFO L87 Difference]: Start difference. First operand 210 states and 265 transitions. Second operand has 23 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 22 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:56:31,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:56:31,166 INFO L93 Difference]: Finished difference Result 251 states and 313 transitions. [2021-11-21 01:56:31,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-21 01:56:31,166 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 22 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2021-11-21 01:56:31,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:56:31,168 INFO L225 Difference]: With dead ends: 251 [2021-11-21 01:56:31,169 INFO L226 Difference]: Without dead ends: 251 [2021-11-21 01:56:31,169 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 702 ImplicationChecksByTransitivity, 12.1s TimeCoverageRelationStatistics Valid=489, Invalid=3051, Unknown=0, NotChecked=0, Total=3540 [2021-11-21 01:56:31,170 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 149 mSDsluCounter, 156 mSDsCounter, 0 mSdLazyCounter, 485 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 149 SdHoareTripleChecker+Valid, 160 SdHoareTripleChecker+Invalid, 518 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 485 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-21 01:56:31,170 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [149 Valid, 160 Invalid, 518 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 485 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-21 01:56:31,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 251 states. [2021-11-21 01:56:31,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 251 to 216. [2021-11-21 01:56:31,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 216 states, 212 states have (on average 1.2830188679245282) internal successors, (272), 215 states have internal predecessors, (272), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:56:31,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 272 transitions. [2021-11-21 01:56:31,178 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 272 transitions. Word has length 34 [2021-11-21 01:56:31,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:56:31,179 INFO L470 AbstractCegarLoop]: Abstraction has 216 states and 272 transitions. [2021-11-21 01:56:31,179 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 22 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:56:31,179 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 272 transitions. [2021-11-21 01:56:31,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-21 01:56:31,180 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:56:31,180 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:56:31,217 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-21 01:56:31,401 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-11-21 01:56:31,401 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:56:31,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:56:31,402 INFO L85 PathProgramCache]: Analyzing trace with hash 819129658, now seen corresponding path program 5 times [2021-11-21 01:56:31,402 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:56:31,402 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1019614607] [2021-11-21 01:56:31,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:56:31,402 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:56:31,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:56:32,167 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 8 proven. 23 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:56:32,167 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:56:32,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1019614607] [2021-11-21 01:56:32,167 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1019614607] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:56:32,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1605488933] [2021-11-21 01:56:32,167 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:56:32,167 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:56:32,168 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:56:32,169 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:56:32,185 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-21 01:56:32,258 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-21 01:56:32,258 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:56:32,260 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 49 conjunts are in the unsatisfiable core [2021-11-21 01:56:32,261 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:56:32,267 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-21 01:56:32,484 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-21 01:56:32,546 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 01:56:32,546 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 34 [2021-11-21 01:56:33,163 INFO L354 Elim1Store]: treesize reduction 42, result has 6.7 percent of original size [2021-11-21 01:56:33,164 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 38 treesize of output 23 [2021-11-21 01:56:33,173 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 8 proven. 19 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:56:33,173 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:56:35,605 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 56 treesize of output 50 [2021-11-21 01:56:35,869 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 8 proven. 19 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:56:35,869 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1605488933] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:56:35,869 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [188883342] [2021-11-21 01:56:35,873 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-21 01:56:35,874 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:56:35,874 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:56:35,874 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:56:35,874 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:56:35,957 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:56:35,958 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 01:56:36,129 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 20 treesize of output 16 [2021-11-21 01:56:36,533 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 01:56:36,534 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 180 treesize of output 179 [2021-11-21 01:56:37,080 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:56:37,381 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:56:37,636 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:56:37,637 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 74 treesize of output 66 [2021-11-21 01:56:37,900 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:56:38,114 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 14 treesize of output 10 [2021-11-21 01:56:38,170 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 01:56:38,173 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-21 01:56:48,717 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:56:53,193 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:56:53,193 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:56:53,193 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 13, 13] total 37 [2021-11-21 01:56:53,193 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [398760780] [2021-11-21 01:56:53,193 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:56:53,194 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-21 01:56:53,194 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:56:53,194 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-21 01:56:53,194 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=207, Invalid=2762, Unknown=1, NotChecked=0, Total=2970 [2021-11-21 01:56:53,194 INFO L87 Difference]: Start difference. First operand 216 states and 272 transitions. Second operand has 38 states, 38 states have (on average 2.236842105263158) internal successors, (85), 37 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) [2021-11-21 01:56:55,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:56:55,721 INFO L93 Difference]: Finished difference Result 451 states and 576 transitions. [2021-11-21 01:56:55,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-21 01:56:55,722 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.236842105263158) internal successors, (85), 37 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) Word has length 35 [2021-11-21 01:56:55,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:56:55,725 INFO L225 Difference]: With dead ends: 451 [2021-11-21 01:56:55,725 INFO L226 Difference]: Without dead ends: 445 [2021-11-21 01:56:55,726 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1688 ImplicationChecksByTransitivity, 9.9s TimeCoverageRelationStatistics Valid=509, Invalid=6296, Unknown=1, NotChecked=0, Total=6806 [2021-11-21 01:56:55,727 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 238 mSDsluCounter, 1253 mSDsCounter, 0 mSdLazyCounter, 574 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 238 SdHoareTripleChecker+Valid, 1138 SdHoareTripleChecker+Invalid, 822 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 574 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 211 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 01:56:55,727 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [238 Valid, 1138 Invalid, 822 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 574 Invalid, 0 Unknown, 211 Unchecked, 0.5s Time] [2021-11-21 01:56:55,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 445 states. [2021-11-21 01:56:55,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 445 to 263. [2021-11-21 01:56:55,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 263 states, 259 states have (on average 1.2664092664092663) internal successors, (328), 262 states have internal predecessors, (328), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:56:55,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 263 states to 263 states and 328 transitions. [2021-11-21 01:56:55,737 INFO L78 Accepts]: Start accepts. Automaton has 263 states and 328 transitions. Word has length 35 [2021-11-21 01:56:55,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:56:55,738 INFO L470 AbstractCegarLoop]: Abstraction has 263 states and 328 transitions. [2021-11-21 01:56:55,738 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 2.236842105263158) internal successors, (85), 37 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) [2021-11-21 01:56:55,738 INFO L276 IsEmpty]: Start isEmpty. Operand 263 states and 328 transitions. [2021-11-21 01:56:55,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-21 01:56:55,739 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:56:55,739 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:56:55,781 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-21 01:56:55,961 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-11-21 01:56:55,961 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:56:55,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:56:55,961 INFO L85 PathProgramCache]: Analyzing trace with hash -1502209114, now seen corresponding path program 1 times [2021-11-21 01:56:55,961 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:56:55,962 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1158669635] [2021-11-21 01:56:55,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:56:55,962 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:56:55,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:56:56,120 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 01:56:56,120 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:56:56,120 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1158669635] [2021-11-21 01:56:56,120 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1158669635] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:56:56,120 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [769936143] [2021-11-21 01:56:56,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:56:56,120 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:56:56,121 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:56:56,122 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:56:56,147 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-21 01:56:56,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:56:56,220 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-21 01:56:56,222 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:56:56,417 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 01:56:56,417 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:56:56,793 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-11-21 01:56:56,813 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 01:56:56,814 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [769936143] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:56:56,814 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1368300080] [2021-11-21 01:56:56,816 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2021-11-21 01:56:56,816 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:56:56,816 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:56:56,816 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:56:56,817 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:56:56,935 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:56:56,937 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 01:56:57,160 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:56:57,567 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:56:57,568 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 198 treesize of output 190 [2021-11-21 01:56:57,896 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:56:58,147 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 20 treesize of output 16 [2021-11-21 01:56:58,395 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 01:56:58,395 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 87 treesize of output 86 [2021-11-21 01:56:58,727 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:56:58,924 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 14 treesize of output 10 [2021-11-21 01:56:59,098 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 01:56:59,099 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-21 01:57:10,949 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:57:16,022 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:57:16,022 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:57:16,023 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2021-11-21 01:57:16,023 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1781421968] [2021-11-21 01:57:16,023 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:57:16,023 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-21 01:57:16,024 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:57:16,024 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-21 01:57:16,024 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=1246, Unknown=0, NotChecked=0, Total=1406 [2021-11-21 01:57:16,024 INFO L87 Difference]: Start difference. First operand 263 states and 328 transitions. Second operand has 19 states, 18 states have (on average 3.388888888888889) internal successors, (61), 18 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) [2021-11-21 01:57:16,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:57:16,684 INFO L93 Difference]: Finished difference Result 387 states and 473 transitions. [2021-11-21 01:57:16,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-21 01:57:16,685 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 3.388888888888889) internal successors, (61), 18 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 36 [2021-11-21 01:57:16,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:57:16,687 INFO L225 Difference]: With dead ends: 387 [2021-11-21 01:57:16,688 INFO L226 Difference]: Without dead ends: 387 [2021-11-21 01:57:16,688 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 510 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=301, Invalid=2149, Unknown=0, NotChecked=0, Total=2450 [2021-11-21 01:57:16,689 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 391 mSDsluCounter, 409 mSDsCounter, 0 mSdLazyCounter, 614 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 391 SdHoareTripleChecker+Valid, 397 SdHoareTripleChecker+Invalid, 641 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 614 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:57:16,689 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [391 Valid, 397 Invalid, 641 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 614 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:57:16,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 387 states. [2021-11-21 01:57:16,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 387 to 263. [2021-11-21 01:57:16,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 263 states, 259 states have (on average 1.2625482625482625) internal successors, (327), 262 states have internal predecessors, (327), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:57:16,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 263 states to 263 states and 327 transitions. [2021-11-21 01:57:16,700 INFO L78 Accepts]: Start accepts. Automaton has 263 states and 327 transitions. Word has length 36 [2021-11-21 01:57:16,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:57:16,700 INFO L470 AbstractCegarLoop]: Abstraction has 263 states and 327 transitions. [2021-11-21 01:57:16,700 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 3.388888888888889) internal successors, (61), 18 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) [2021-11-21 01:57:16,700 INFO L276 IsEmpty]: Start isEmpty. Operand 263 states and 327 transitions. [2021-11-21 01:57:16,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-21 01:57:16,701 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:57:16,702 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:57:16,747 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-21 01:57:16,917 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:57:16,917 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:57:16,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:57:16,917 INFO L85 PathProgramCache]: Analyzing trace with hash -1346682423, now seen corresponding path program 1 times [2021-11-21 01:57:16,917 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:57:16,917 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [898085375] [2021-11-21 01:57:16,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:57:16,918 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:57:16,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:57:17,021 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-21 01:57:17,021 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:57:17,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [898085375] [2021-11-21 01:57:17,022 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [898085375] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:57:17,022 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1079620925] [2021-11-21 01:57:17,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:57:17,022 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:57:17,022 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:57:17,023 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:57:17,044 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-21 01:57:17,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:57:17,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-21 01:57:17,124 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:57:17,131 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-21 01:57:17,335 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-21 01:57:17,391 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 01:57:17,391 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 34 [2021-11-21 01:57:17,995 INFO L354 Elim1Store]: treesize reduction 42, result has 6.7 percent of original size [2021-11-21 01:57:17,995 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 38 treesize of output 23 [2021-11-21 01:57:18,020 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 01:57:18,020 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:57:25,848 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 56 treesize of output 50 [2021-11-21 01:57:26,029 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 01:57:26,029 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1079620925] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:57:26,029 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [847984375] [2021-11-21 01:57:26,030 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-21 01:57:26,030 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:57:26,031 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:57:26,031 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:57:26,031 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:57:26,101 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:57:26,101 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 01:57:26,331 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 20 treesize of output 16 [2021-11-21 01:57:26,747 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 01:57:26,749 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 180 treesize of output 179 [2021-11-21 01:57:27,261 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:57:27,536 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:57:27,797 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:57:27,803 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 74 treesize of output 66 [2021-11-21 01:57:28,004 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:57:28,189 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 14 treesize of output 10 [2021-11-21 01:57:28,350 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 01:57:28,350 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-21 01:57:49,977 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:57:59,492 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:57:59,492 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:57:59,492 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 12, 12] total 28 [2021-11-21 01:57:59,492 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [706868239] [2021-11-21 01:57:59,492 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:57:59,493 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-21 01:57:59,493 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:57:59,493 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-21 01:57:59,494 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=2370, Unknown=7, NotChecked=0, Total=2550 [2021-11-21 01:57:59,494 INFO L87 Difference]: Start difference. First operand 263 states and 327 transitions. Second operand has 28 states, 28 states have (on average 3.142857142857143) internal successors, (88), 28 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:58:00,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:58:00,056 INFO L93 Difference]: Finished difference Result 358 states and 435 transitions. [2021-11-21 01:58:00,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-21 01:58:00,056 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 3.142857142857143) internal successors, (88), 28 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2021-11-21 01:58:00,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:58:00,058 INFO L225 Difference]: With dead ends: 358 [2021-11-21 01:58:00,059 INFO L226 Difference]: Without dead ends: 358 [2021-11-21 01:58:00,059 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 791 ImplicationChecksByTransitivity, 18.1s TimeCoverageRelationStatistics Valid=229, Invalid=3424, Unknown=7, NotChecked=0, Total=3660 [2021-11-21 01:58:00,060 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 49 mSDsluCounter, 648 mSDsCounter, 0 mSdLazyCounter, 307 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 595 SdHoareTripleChecker+Invalid, 441 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 307 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 127 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:58:00,061 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 595 Invalid, 441 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 307 Invalid, 0 Unknown, 127 Unchecked, 0.2s Time] [2021-11-21 01:58:00,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 358 states. [2021-11-21 01:58:00,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 358 to 309. [2021-11-21 01:58:00,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 309 states, 305 states have (on average 1.2622950819672132) internal successors, (385), 308 states have internal predecessors, (385), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:58:00,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 309 states to 309 states and 385 transitions. [2021-11-21 01:58:00,070 INFO L78 Accepts]: Start accepts. Automaton has 309 states and 385 transitions. Word has length 36 [2021-11-21 01:58:00,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:58:00,071 INFO L470 AbstractCegarLoop]: Abstraction has 309 states and 385 transitions. [2021-11-21 01:58:00,071 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 3.142857142857143) internal successors, (88), 28 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:58:00,071 INFO L276 IsEmpty]: Start isEmpty. Operand 309 states and 385 transitions. [2021-11-21 01:58:00,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-21 01:58:00,072 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:58:00,073 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:58:00,118 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2021-11-21 01:58:00,289 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:00,289 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:58:00,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:58:00,289 INFO L85 PathProgramCache]: Analyzing trace with hash 1477556862, now seen corresponding path program 6 times [2021-11-21 01:58:00,290 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:58:00,290 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [792515173] [2021-11-21 01:58:00,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:00,290 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:58:00,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:58:00,481 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 6 proven. 28 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:58:00,481 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:58:00,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [792515173] [2021-11-21 01:58:00,481 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [792515173] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:58:00,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1313428438] [2021-11-21 01:58:00,482 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:58:00,482 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:00,482 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:58:00,483 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:58:00,508 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-21 01:58:00,604 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:58:00,604 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:58:00,607 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-21 01:58:00,608 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:58:00,819 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 12 proven. 22 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:58:00,820 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:58:01,225 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-11-21 01:58:01,253 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 12 proven. 22 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:58:01,253 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1313428438] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:58:01,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1220181442] [2021-11-21 01:58:01,255 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-21 01:58:01,255 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:58:01,255 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:58:01,255 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:58:01,255 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:58:01,369 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:01,371 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 01:58:01,596 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 20 treesize of output 16 [2021-11-21 01:58:02,023 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 01:58:02,023 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 180 treesize of output 179 [2021-11-21 01:58:02,608 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:58:02,801 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:58:03,059 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:03,060 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 74 treesize of output 66 [2021-11-21 01:58:03,348 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:58:03,540 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 14 treesize of output 10 [2021-11-21 01:58:03,729 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 01:58:03,729 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-21 01:58:14,349 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:58:18,527 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:58:18,527 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:58:18,527 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2021-11-21 01:58:18,527 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [483526182] [2021-11-21 01:58:18,527 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:58:18,528 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-21 01:58:18,528 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:58:18,528 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-21 01:58:18,528 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=1312, Unknown=0, NotChecked=0, Total=1482 [2021-11-21 01:58:18,529 INFO L87 Difference]: Start difference. First operand 309 states and 385 transitions. Second operand has 22 states, 21 states have (on average 3.1904761904761907) internal successors, (67), 21 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:58:19,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:58:19,504 INFO L93 Difference]: Finished difference Result 568 states and 714 transitions. [2021-11-21 01:58:19,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-21 01:58:19,504 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 3.1904761904761907) internal successors, (67), 21 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 37 [2021-11-21 01:58:19,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:58:19,507 INFO L225 Difference]: With dead ends: 568 [2021-11-21 01:58:19,507 INFO L226 Difference]: Without dead ends: 568 [2021-11-21 01:58:19,508 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 540 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=333, Invalid=2319, Unknown=0, NotChecked=0, Total=2652 [2021-11-21 01:58:19,508 INFO L933 BasicCegarLoop]: 82 mSDtfsCounter, 438 mSDsluCounter, 855 mSDsCounter, 0 mSdLazyCounter, 1010 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 438 SdHoareTripleChecker+Valid, 800 SdHoareTripleChecker+Invalid, 1025 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 1010 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 01:58:19,509 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [438 Valid, 800 Invalid, 1025 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 1010 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-21 01:58:19,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 568 states. [2021-11-21 01:58:19,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 568 to 424. [2021-11-21 01:58:19,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 424 states, 420 states have (on average 1.2833333333333334) internal successors, (539), 423 states have internal predecessors, (539), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:58:19,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 424 states to 424 states and 539 transitions. [2021-11-21 01:58:19,523 INFO L78 Accepts]: Start accepts. Automaton has 424 states and 539 transitions. Word has length 37 [2021-11-21 01:58:19,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:58:19,524 INFO L470 AbstractCegarLoop]: Abstraction has 424 states and 539 transitions. [2021-11-21 01:58:19,524 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 3.1904761904761907) internal successors, (67), 21 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:58:19,524 INFO L276 IsEmpty]: Start isEmpty. Operand 424 states and 539 transitions. [2021-11-21 01:58:19,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-21 01:58:19,525 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:58:19,526 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:58:19,561 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-21 01:58:19,740 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:19,740 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:58:19,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:58:19,741 INFO L85 PathProgramCache]: Analyzing trace with hash -1748585926, now seen corresponding path program 4 times [2021-11-21 01:58:19,741 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:58:19,741 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1750173480] [2021-11-21 01:58:19,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:19,741 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:58:19,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:58:20,096 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 8 proven. 19 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 01:58:20,096 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:58:20,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1750173480] [2021-11-21 01:58:20,097 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1750173480] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:58:20,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [378795694] [2021-11-21 01:58:20,097 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:58:20,098 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:20,098 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:58:20,102 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:58:20,103 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-21 01:58:20,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:58:20,184 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 49 conjunts are in the unsatisfiable core [2021-11-21 01:58:20,185 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:58:20,191 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-21 01:58:20,426 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-21 01:58:20,483 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 01:58:20,483 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 34 [2021-11-21 01:58:21,178 INFO L354 Elim1Store]: treesize reduction 42, result has 6.7 percent of original size [2021-11-21 01:58:21,179 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 38 treesize of output 23 [2021-11-21 01:58:21,190 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 8 proven. 19 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 01:58:21,190 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:58:22,378 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 56 treesize of output 50 [2021-11-21 01:58:22,645 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 8 proven. 19 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 01:58:22,645 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [378795694] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:58:22,645 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [233692965] [2021-11-21 01:58:22,646 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-21 01:58:22,647 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:58:22,647 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:58:22,647 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:58:22,647 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:58:22,730 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:22,731 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 01:58:22,964 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 20 treesize of output 16 [2021-11-21 01:58:23,516 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 01:58:23,516 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 180 treesize of output 179 [2021-11-21 01:58:23,992 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:58:24,250 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 20 treesize of output 16 [2021-11-21 01:58:24,538 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 01:58:24,538 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 69 treesize of output 68 [2021-11-21 01:58:24,853 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:58:25,036 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 14 treesize of output 10 [2021-11-21 01:58:25,174 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 01:58:25,175 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-21 01:58:36,790 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:58:42,788 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:58:42,788 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:58:42,788 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 33 [2021-11-21 01:58:42,788 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1583053104] [2021-11-21 01:58:42,788 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:58:42,789 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-21 01:58:42,789 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:58:42,789 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-21 01:58:42,789 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=2285, Unknown=1, NotChecked=0, Total=2450 [2021-11-21 01:58:42,790 INFO L87 Difference]: Start difference. First operand 424 states and 539 transitions. Second operand has 34 states, 34 states have (on average 2.5294117647058822) internal successors, (86), 33 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:58:43,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:58:43,645 INFO L93 Difference]: Finished difference Result 554 states and 703 transitions. [2021-11-21 01:58:43,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-21 01:58:43,646 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.5294117647058822) internal successors, (86), 33 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2021-11-21 01:58:43,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:58:43,649 INFO L225 Difference]: With dead ends: 554 [2021-11-21 01:58:43,649 INFO L226 Difference]: Without dead ends: 548 [2021-11-21 01:58:43,650 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 788 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=257, Invalid=3402, Unknown=1, NotChecked=0, Total=3660 [2021-11-21 01:58:43,651 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 124 mSDsluCounter, 1349 mSDsCounter, 0 mSdLazyCounter, 475 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 124 SdHoareTripleChecker+Valid, 1205 SdHoareTripleChecker+Invalid, 676 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 475 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 190 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:58:43,651 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [124 Valid, 1205 Invalid, 676 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 475 Invalid, 0 Unknown, 190 Unchecked, 0.3s Time] [2021-11-21 01:58:43,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 548 states. [2021-11-21 01:58:43,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 548 to 428. [2021-11-21 01:58:43,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 428 states, 424 states have (on average 1.278301886792453) internal successors, (542), 427 states have internal predecessors, (542), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:58:43,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 428 states to 428 states and 542 transitions. [2021-11-21 01:58:43,666 INFO L78 Accepts]: Start accepts. Automaton has 428 states and 542 transitions. Word has length 39 [2021-11-21 01:58:43,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:58:43,667 INFO L470 AbstractCegarLoop]: Abstraction has 428 states and 542 transitions. [2021-11-21 01:58:43,667 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 2.5294117647058822) internal successors, (86), 33 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:58:43,667 INFO L276 IsEmpty]: Start isEmpty. Operand 428 states and 542 transitions. [2021-11-21 01:58:43,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-21 01:58:43,669 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:58:43,669 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:58:43,716 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-21 01:58:43,885 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2021-11-21 01:58:43,885 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:58:43,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:58:43,885 INFO L85 PathProgramCache]: Analyzing trace with hash -615483907, now seen corresponding path program 1 times [2021-11-21 01:58:43,886 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:58:43,886 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1847210776] [2021-11-21 01:58:43,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:43,886 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:58:43,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:58:43,917 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-21 01:58:43,918 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:58:43,918 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1847210776] [2021-11-21 01:58:43,918 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1847210776] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:58:43,918 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:58:43,918 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 01:58:43,919 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1902139065] [2021-11-21 01:58:43,919 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:58:43,919 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 01:58:43,919 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:58:43,920 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 01:58:43,920 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 01:58:43,920 INFO L87 Difference]: Start difference. First operand 428 states and 542 transitions. Second operand has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 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) [2021-11-21 01:58:43,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:58:43,963 INFO L93 Difference]: Finished difference Result 434 states and 539 transitions. [2021-11-21 01:58:43,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 01:58:43,964 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 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) Word has length 40 [2021-11-21 01:58:43,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:58:43,967 INFO L225 Difference]: With dead ends: 434 [2021-11-21 01:58:43,967 INFO L226 Difference]: Without dead ends: 370 [2021-11-21 01:58:43,967 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:58:43,973 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 1 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:58:43,979 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 77 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:58:43,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 370 states. [2021-11-21 01:58:43,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 370 to 370. [2021-11-21 01:58:43,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 370 states, 366 states have (on average 1.1967213114754098) internal successors, (438), 369 states have internal predecessors, (438), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:58:43,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 370 states to 370 states and 438 transitions. [2021-11-21 01:58:43,990 INFO L78 Accepts]: Start accepts. Automaton has 370 states and 438 transitions. Word has length 40 [2021-11-21 01:58:43,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:58:43,991 INFO L470 AbstractCegarLoop]: Abstraction has 370 states and 438 transitions. [2021-11-21 01:58:43,991 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 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) [2021-11-21 01:58:43,991 INFO L276 IsEmpty]: Start isEmpty. Operand 370 states and 438 transitions. [2021-11-21 01:58:43,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-21 01:58:43,992 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:58:43,992 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:58:43,993 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2021-11-21 01:58:43,993 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr21REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:58:43,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:58:43,993 INFO L85 PathProgramCache]: Analyzing trace with hash 80022072, now seen corresponding path program 1 times [2021-11-21 01:58:43,994 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:58:43,994 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1703929998] [2021-11-21 01:58:43,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:43,994 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:58:44,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:58:44,198 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 01:58:44,198 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:58:44,198 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1703929998] [2021-11-21 01:58:44,199 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1703929998] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:58:44,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [522414489] [2021-11-21 01:58:44,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:44,199 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:44,199 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:58:44,200 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:58:44,209 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-21 01:58:44,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:58:44,291 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-21 01:58:44,292 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:58:44,536 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 01:58:44,536 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:58:44,807 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-11-21 01:58:44,850 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 01:58:44,850 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [522414489] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:58:44,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1522076318] [2021-11-21 01:58:44,851 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-21 01:58:44,852 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:58:44,852 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:58:44,852 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:58:44,853 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:58:44,875 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:44,876 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 01:58:45,162 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 20 treesize of output 16 [2021-11-21 01:58:45,532 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 01:58:45,532 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 180 treesize of output 179 [2021-11-21 01:58:46,038 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:58:46,305 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 20 treesize of output 16 [2021-11-21 01:58:46,520 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 01:58:46,521 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 69 treesize of output 68 [2021-11-21 01:58:46,781 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:58:47,002 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 14 treesize of output 10 [2021-11-21 01:58:47,134 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 01:58:47,135 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-21 01:58:59,589 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:59:05,692 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1522076318] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:59:05,692 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:59:05,692 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [10, 10, 10] total 45 [2021-11-21 01:59:05,692 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1751855195] [2021-11-21 01:59:05,692 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:59:05,692 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-21 01:59:05,693 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:59:05,693 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-21 01:59:05,693 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=254, Invalid=1816, Unknown=0, NotChecked=0, Total=2070 [2021-11-21 01:59:05,693 INFO L87 Difference]: Start difference. First operand 370 states and 438 transitions. Second operand has 24 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 23 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) [2021-11-21 01:59:12,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:59:12,551 INFO L93 Difference]: Finished difference Result 401 states and 468 transitions. [2021-11-21 01:59:12,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-21 01:59:12,552 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 23 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 40 [2021-11-21 01:59:12,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:59:12,554 INFO L225 Difference]: With dead ends: 401 [2021-11-21 01:59:12,554 INFO L226 Difference]: Without dead ends: 401 [2021-11-21 01:59:12,555 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 84 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 739 ImplicationChecksByTransitivity, 12.9s TimeCoverageRelationStatistics Valid=519, Invalid=3141, Unknown=0, NotChecked=0, Total=3660 [2021-11-21 01:59:12,555 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 163 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 271 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 163 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 271 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:59:12,556 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [163 Valid, 52 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 271 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:59:12,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 401 states. [2021-11-21 01:59:12,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 401 to 365. [2021-11-21 01:59:12,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 365 states, 361 states have (on average 1.1994459833795015) internal successors, (433), 364 states have internal predecessors, (433), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:59:12,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 365 states to 365 states and 433 transitions. [2021-11-21 01:59:12,565 INFO L78 Accepts]: Start accepts. Automaton has 365 states and 433 transitions. Word has length 40 [2021-11-21 01:59:12,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:59:12,566 INFO L470 AbstractCegarLoop]: Abstraction has 365 states and 433 transitions. [2021-11-21 01:59:12,566 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 23 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) [2021-11-21 01:59:12,566 INFO L276 IsEmpty]: Start isEmpty. Operand 365 states and 433 transitions. [2021-11-21 01:59:12,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-21 01:59:12,567 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:59:12,568 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:59:12,617 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2021-11-21 01:59:12,793 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2021-11-21 01:59:12,793 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:59:12,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:59:12,794 INFO L85 PathProgramCache]: Analyzing trace with hash 821926534, now seen corresponding path program 7 times [2021-11-21 01:59:12,794 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:59:12,794 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1201187711] [2021-11-21 01:59:12,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:12,794 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:59:12,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:13,250 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 11 proven. 37 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:59:13,251 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:59:13,251 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1201187711] [2021-11-21 01:59:13,251 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1201187711] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:59:13,251 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1231186571] [2021-11-21 01:59:13,251 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:59:13,251 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:13,251 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:59:13,252 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:59:13,257 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-21 01:59:13,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:13,356 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 59 conjunts are in the unsatisfiable core [2021-11-21 01:59:13,358 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:59:13,365 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-21 01:59:13,648 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-21 01:59:13,714 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 01:59:13,714 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 34 [2021-11-21 01:59:14,502 INFO L354 Elim1Store]: treesize reduction 42, result has 6.7 percent of original size [2021-11-21 01:59:14,502 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 38 treesize of output 23 [2021-11-21 01:59:14,511 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 11 proven. 37 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:59:14,512 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:59:15,493 WARN L838 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_main_~nondetString2~0#1.offset| Int) (|ULTIMATE.start_main_~length2~0#1| Int)) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| (store (select |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base|) (+ (- 1) |ULTIMATE.start_main_~nondetString2~0#1.offset| |ULTIMATE.start_main_~length2~0#1|) 0)) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 3)) 0)) is different from false [2021-11-21 01:59:15,498 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 56 treesize of output 50 [2021-11-21 01:59:15,795 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 11 proven. 37 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:59:15,795 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1231186571] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:59:15,795 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [505963113] [2021-11-21 01:59:15,797 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-21 01:59:15,797 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:59:15,797 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:59:15,798 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:59:15,798 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:59:15,854 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:15,855 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 01:59:16,055 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:59:16,488 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:16,489 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 198 treesize of output 190 [2021-11-21 01:59:16,780 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:59:17,068 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:59:17,377 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:17,378 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 80 treesize of output 72 [2021-11-21 01:59:17,608 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:59:17,773 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 14 treesize of output 10 [2021-11-21 01:59:17,902 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 01:59:17,902 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-21 01:59:28,713 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:59:33,445 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:59:33,445 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:59:33,445 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15] total 38 [2021-11-21 01:59:33,445 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1127807929] [2021-11-21 01:59:33,445 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:59:33,446 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-21 01:59:33,446 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:59:33,446 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-21 01:59:33,446 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=2783, Unknown=1, NotChecked=106, Total=3080 [2021-11-21 01:59:33,446 INFO L87 Difference]: Start difference. First operand 365 states and 433 transitions. Second operand has 39 states, 39 states have (on average 2.4871794871794872) internal successors, (97), 38 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:59:36,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:59:36,291 INFO L93 Difference]: Finished difference Result 688 states and 816 transitions. [2021-11-21 01:59:36,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-21 01:59:36,292 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.4871794871794872) internal successors, (97), 38 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2021-11-21 01:59:36,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:59:36,296 INFO L225 Difference]: With dead ends: 688 [2021-11-21 01:59:36,296 INFO L226 Difference]: Without dead ends: 665 [2021-11-21 01:59:36,297 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 68 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 970 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=303, Invalid=4392, Unknown=1, NotChecked=134, Total=4830 [2021-11-21 01:59:36,298 INFO L933 BasicCegarLoop]: 57 mSDtfsCounter, 253 mSDsluCounter, 1597 mSDsCounter, 0 mSdLazyCounter, 952 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 253 SdHoareTripleChecker+Valid, 1303 SdHoareTripleChecker+Invalid, 1299 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 952 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 333 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 01:59:36,298 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [253 Valid, 1303 Invalid, 1299 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 952 Invalid, 0 Unknown, 333 Unchecked, 0.5s Time] [2021-11-21 01:59:36,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 665 states. [2021-11-21 01:59:36,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 665 to 396. [2021-11-21 01:59:36,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 396 states, 392 states have (on average 1.1938775510204083) internal successors, (468), 395 states have internal predecessors, (468), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:59:36,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 396 states to 396 states and 468 transitions. [2021-11-21 01:59:36,310 INFO L78 Accepts]: Start accepts. Automaton has 396 states and 468 transitions. Word has length 41 [2021-11-21 01:59:36,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:59:36,311 INFO L470 AbstractCegarLoop]: Abstraction has 396 states and 468 transitions. [2021-11-21 01:59:36,311 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 2.4871794871794872) internal successors, (97), 38 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:59:36,311 INFO L276 IsEmpty]: Start isEmpty. Operand 396 states and 468 transitions. [2021-11-21 01:59:36,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-21 01:59:36,312 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:59:36,313 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:59:36,358 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-11-21 01:59:36,533 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-11-21 01:59:36,533 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 01:59:36,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:59:36,533 INFO L85 PathProgramCache]: Analyzing trace with hash 1444008922, now seen corresponding path program 2 times [2021-11-21 01:59:36,534 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:59:36,534 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [723427347] [2021-11-21 01:59:36,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:36,534 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:59:36,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:36,720 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 6 proven. 22 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 01:59:36,720 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:59:36,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [723427347] [2021-11-21 01:59:36,720 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [723427347] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:59:36,721 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [328137269] [2021-11-21 01:59:36,721 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:59:36,721 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:36,721 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:59:36,722 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:59:36,745 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-21 01:59:36,840 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 01:59:36,840 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:59:36,843 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-21 01:59:36,845 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:59:36,865 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-21 01:59:36,865 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-21 01:59:36,880 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-21 01:59:37,152 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2021-11-21 01:59:37,206 INFO L354 Elim1Store]: treesize reduction 47, result has 19.0 percent of original size [2021-11-21 01:59:37,206 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 31 [2021-11-21 01:59:37,749 INFO L354 Elim1Store]: treesize reduction 45, result has 18.2 percent of original size [2021-11-21 01:59:37,749 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 37 treesize of output 24 [2021-11-21 01:59:37,900 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-21 01:59:37,900 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:59:38,571 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 71 treesize of output 65 [2021-11-21 01:59:38,911 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-21 01:59:38,911 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [328137269] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:59:38,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1913311803] [2021-11-21 01:59:38,912 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2021-11-21 01:59:38,913 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:59:38,913 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:59:38,913 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:59:38,913 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:59:38,973 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:38,974 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 01:59:39,165 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:59:39,577 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:39,578 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 198 treesize of output 190 [2021-11-21 01:59:39,910 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:59:40,133 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 20 treesize of output 16 [2021-11-21 01:59:40,442 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 01:59:40,442 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 87 treesize of output 86 [2021-11-21 01:59:40,750 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 01:59:40,827 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 14 treesize of output 10 [2021-11-21 01:59:40,970 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 01:59:40,970 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-21 01:59:53,611 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:59:59,876 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:59:59,876 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:59:59,877 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8, 8] total 27 [2021-11-21 01:59:59,877 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [889651163] [2021-11-21 01:59:59,877 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:59:59,877 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-21 01:59:59,877 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:59:59,877 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-21 01:59:59,878 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=187, Invalid=2069, Unknown=0, NotChecked=0, Total=2256 [2021-11-21 01:59:59,878 INFO L87 Difference]: Start difference. First operand 396 states and 468 transitions. Second operand has 29 states, 28 states have (on average 3.25) internal successors, (91), 28 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) [2021-11-21 02:00:01,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 02:00:01,488 INFO L93 Difference]: Finished difference Result 570 states and 666 transitions. [2021-11-21 02:00:01,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-21 02:00:01,488 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 3.25) internal successors, (91), 28 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) Word has length 42 [2021-11-21 02:00:01,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 02:00:01,491 INFO L225 Difference]: With dead ends: 570 [2021-11-21 02:00:01,491 INFO L226 Difference]: Without dead ends: 570 [2021-11-21 02:00:01,492 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1419 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=506, Invalid=5500, Unknown=0, NotChecked=0, Total=6006 [2021-11-21 02:00:01,493 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 143 mSDsluCounter, 400 mSDsCounter, 0 mSdLazyCounter, 758 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 143 SdHoareTripleChecker+Valid, 394 SdHoareTripleChecker+Invalid, 909 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 758 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 124 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 02:00:01,493 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [143 Valid, 394 Invalid, 909 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 758 Invalid, 0 Unknown, 124 Unchecked, 0.5s Time] [2021-11-21 02:00:01,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 570 states. [2021-11-21 02:00:01,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 570 to 410. [2021-11-21 02:00:01,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 410 states, 406 states have (on average 1.1921182266009853) internal successors, (484), 409 states have internal predecessors, (484), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 02:00:01,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 410 states to 410 states and 484 transitions. [2021-11-21 02:00:01,505 INFO L78 Accepts]: Start accepts. Automaton has 410 states and 484 transitions. Word has length 42 [2021-11-21 02:00:01,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 02:00:01,505 INFO L470 AbstractCegarLoop]: Abstraction has 410 states and 484 transitions. [2021-11-21 02:00:01,505 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 3.25) internal successors, (91), 28 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) [2021-11-21 02:00:01,506 INFO L276 IsEmpty]: Start isEmpty. Operand 410 states and 484 transitions. [2021-11-21 02:00:01,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-21 02:00:01,507 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 02:00:01,507 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 02:00:01,554 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-11-21 02:00:01,733 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-11-21 02:00:01,733 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 02:00:01,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 02:00:01,733 INFO L85 PathProgramCache]: Analyzing trace with hash 1354927365, now seen corresponding path program 2 times [2021-11-21 02:00:01,734 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 02:00:01,734 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [900523988] [2021-11-21 02:00:01,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 02:00:01,734 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 02:00:01,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 02:00:01,894 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-21 02:00:01,894 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 02:00:01,894 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [900523988] [2021-11-21 02:00:01,894 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [900523988] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 02:00:01,894 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [543136899] [2021-11-21 02:00:01,894 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 02:00:01,895 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:00:01,895 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 02:00:01,897 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 02:00:01,920 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-21 02:00:02,013 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-21 02:00:02,013 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 02:00:02,015 INFO L263 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 55 conjunts are in the unsatisfiable core [2021-11-21 02:00:02,017 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 02:00:02,025 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-21 02:00:02,161 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 23 [2021-11-21 02:00:02,234 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 02:00:02,234 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 41 treesize of output 40 [2021-11-21 02:00:03,230 INFO L354 Elim1Store]: treesize reduction 55, result has 19.1 percent of original size [2021-11-21 02:00:03,230 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 47 treesize of output 38 [2021-11-21 02:00:03,328 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-21 02:00:03,328 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 02:00:04,003 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 02:00:04,007 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-21 02:00:04,007 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 120 treesize of output 110 [2021-11-21 02:00:04,016 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 53 treesize of output 45 [2021-11-21 02:00:04,105 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-21 02:00:04,105 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [543136899] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 02:00:04,105 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1461701518] [2021-11-21 02:00:04,106 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-21 02:00:04,106 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 02:00:04,106 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 02:00:04,107 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 02:00:04,107 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 02:00:04,230 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:00:04,231 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 02:00:04,356 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 20 treesize of output 16 [2021-11-21 02:00:04,825 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 02:00:04,825 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 180 treesize of output 179 [2021-11-21 02:00:05,275 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 02:00:05,547 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 20 treesize of output 16 [2021-11-21 02:00:05,856 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 02:00:05,856 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 69 treesize of output 68 [2021-11-21 02:00:06,178 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 02:00:06,442 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 14 treesize of output 10 [2021-11-21 02:00:06,667 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 02:00:06,668 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-21 02:00:30,402 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 02:00:40,351 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 02:00:40,352 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 02:00:40,352 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10, 10] total 29 [2021-11-21 02:00:40,352 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1226728153] [2021-11-21 02:00:40,352 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 02:00:40,352 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-21 02:00:40,352 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 02:00:40,353 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-21 02:00:40,353 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=2626, Unknown=0, NotChecked=0, Total=2862 [2021-11-21 02:00:40,353 INFO L87 Difference]: Start difference. First operand 410 states and 484 transitions. Second operand has 31 states, 30 states have (on average 3.033333333333333) internal successors, (91), 30 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) [2021-11-21 02:00:41,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 02:00:41,069 INFO L93 Difference]: Finished difference Result 445 states and 519 transitions. [2021-11-21 02:00:41,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-21 02:00:41,069 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 3.033333333333333) internal successors, (91), 30 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) Word has length 42 [2021-11-21 02:00:41,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 02:00:41,071 INFO L225 Difference]: With dead ends: 445 [2021-11-21 02:00:41,072 INFO L226 Difference]: Without dead ends: 445 [2021-11-21 02:00:41,072 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 85 SyntacticMatches, 1 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 895 ImplicationChecksByTransitivity, 11.3s TimeCoverageRelationStatistics Valid=334, Invalid=3956, Unknown=0, NotChecked=0, Total=4290 [2021-11-21 02:00:41,072 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 38 mSDsluCounter, 360 mSDsCounter, 0 mSdLazyCounter, 294 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 336 SdHoareTripleChecker+Invalid, 384 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 294 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 87 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 02:00:41,073 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 336 Invalid, 384 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 294 Invalid, 0 Unknown, 87 Unchecked, 0.2s Time] [2021-11-21 02:00:41,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 445 states. [2021-11-21 02:00:41,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 445 to 428. [2021-11-21 02:00:41,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 428 states, 424 states have (on average 1.1839622641509433) internal successors, (502), 427 states have internal predecessors, (502), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 02:00:41,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 428 states to 428 states and 502 transitions. [2021-11-21 02:00:41,082 INFO L78 Accepts]: Start accepts. Automaton has 428 states and 502 transitions. Word has length 42 [2021-11-21 02:00:41,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 02:00:41,083 INFO L470 AbstractCegarLoop]: Abstraction has 428 states and 502 transitions. [2021-11-21 02:00:41,083 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 3.033333333333333) internal successors, (91), 30 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) [2021-11-21 02:00:41,083 INFO L276 IsEmpty]: Start isEmpty. Operand 428 states and 502 transitions. [2021-11-21 02:00:41,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-21 02:00:41,084 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 02:00:41,085 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 02:00:41,120 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Ended with exit code 0 [2021-11-21 02:00:41,301 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-11-21 02:00:41,301 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 02:00:41,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 02:00:41,302 INFO L85 PathProgramCache]: Analyzing trace with hash -598317878, now seen corresponding path program 8 times [2021-11-21 02:00:41,302 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 02:00:41,302 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1108209694] [2021-11-21 02:00:41,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 02:00:41,302 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 02:00:41,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 02:00:41,570 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 12 proven. 45 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 02:00:41,570 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 02:00:41,570 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1108209694] [2021-11-21 02:00:41,570 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1108209694] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 02:00:41,570 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1662767714] [2021-11-21 02:00:41,570 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 02:00:41,571 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:00:41,571 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 02:00:41,573 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 02:00:41,606 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-21 02:00:41,724 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-21 02:00:41,724 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 02:00:41,727 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-21 02:00:41,729 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 02:00:41,737 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-21 02:00:41,743 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 02:00:42,022 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2021-11-21 02:00:42,077 INFO L354 Elim1Store]: treesize reduction 47, result has 19.0 percent of original size [2021-11-21 02:00:42,077 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 31 [2021-11-21 02:00:42,544 INFO L354 Elim1Store]: treesize reduction 45, result has 18.2 percent of original size [2021-11-21 02:00:42,544 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 37 treesize of output 24 [2021-11-21 02:00:42,661 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 3 proven. 14 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-21 02:00:42,661 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 02:00:43,230 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 71 treesize of output 65 [2021-11-21 02:00:43,485 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-21 02:00:43,485 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1662767714] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 02:00:43,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [618098739] [2021-11-21 02:00:43,487 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-21 02:00:43,487 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 02:00:43,487 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 02:00:43,487 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 02:00:43,487 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 02:00:43,551 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:00:43,552 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 02:00:43,765 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 20 treesize of output 16 [2021-11-21 02:00:44,189 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 02:00:44,190 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 180 treesize of output 179 [2021-11-21 02:00:44,737 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 02:00:45,003 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 20 treesize of output 16 [2021-11-21 02:00:45,342 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 02:00:45,342 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 69 treesize of output 68 [2021-11-21 02:00:45,600 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 02:00:45,843 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 14 treesize of output 10 [2021-11-21 02:00:46,074 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 02:00:46,074 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-21 02:00:57,318 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 02:01:01,661 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 02:01:01,661 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 02:01:01,661 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 7, 7] total 27 [2021-11-21 02:01:01,662 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1656186933] [2021-11-21 02:01:01,662 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 02:01:01,662 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-21 02:01:01,662 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 02:01:01,663 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-21 02:01:01,663 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=203, Invalid=1867, Unknown=0, NotChecked=0, Total=2070 [2021-11-21 02:01:01,663 INFO L87 Difference]: Start difference. First operand 428 states and 502 transitions. Second operand has 29 states, 28 states have (on average 3.25) internal successors, (91), 28 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) [2021-11-21 02:01:03,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 02:01:03,216 INFO L93 Difference]: Finished difference Result 432 states and 505 transitions. [2021-11-21 02:01:03,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-21 02:01:03,217 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 3.25) internal successors, (91), 28 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) Word has length 43 [2021-11-21 02:01:03,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 02:01:03,219 INFO L225 Difference]: With dead ends: 432 [2021-11-21 02:01:03,219 INFO L226 Difference]: Without dead ends: 402 [2021-11-21 02:01:03,220 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 104 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1266 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=550, Invalid=4852, Unknown=0, NotChecked=0, Total=5402 [2021-11-21 02:01:03,220 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 52 mSDsluCounter, 399 mSDsCounter, 0 mSdLazyCounter, 596 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 388 SdHoareTripleChecker+Invalid, 836 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 596 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 227 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 02:01:03,220 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 388 Invalid, 836 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 596 Invalid, 0 Unknown, 227 Unchecked, 0.4s Time] [2021-11-21 02:01:03,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 402 states. [2021-11-21 02:01:03,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 402 to 371. [2021-11-21 02:01:03,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 371 states, 367 states have (on average 1.1880108991825613) internal successors, (436), 370 states have internal predecessors, (436), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 02:01:03,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 371 states to 371 states and 436 transitions. [2021-11-21 02:01:03,227 INFO L78 Accepts]: Start accepts. Automaton has 371 states and 436 transitions. Word has length 43 [2021-11-21 02:01:03,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 02:01:03,228 INFO L470 AbstractCegarLoop]: Abstraction has 371 states and 436 transitions. [2021-11-21 02:01:03,228 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 3.25) internal successors, (91), 28 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) [2021-11-21 02:01:03,228 INFO L276 IsEmpty]: Start isEmpty. Operand 371 states and 436 transitions. [2021-11-21 02:01:03,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-21 02:01:03,229 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 02:01:03,229 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 02:01:03,278 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-11-21 02:01:03,447 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-11-21 02:01:03,447 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 02:01:03,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 02:01:03,448 INFO L85 PathProgramCache]: Analyzing trace with hash -414303349, now seen corresponding path program 1 times [2021-11-21 02:01:03,448 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 02:01:03,448 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1753154155] [2021-11-21 02:01:03,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 02:01:03,449 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 02:01:03,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 02:01:03,929 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 02:01:03,929 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 02:01:03,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1753154155] [2021-11-21 02:01:03,929 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1753154155] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 02:01:03,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [264695209] [2021-11-21 02:01:03,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 02:01:03,930 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:01:03,930 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 02:01:03,931 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 02:01:03,957 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-21 02:01:04,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 02:01:04,047 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-21 02:01:04,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 02:01:04,061 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-21 02:01:04,384 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-21 02:01:04,464 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 02:01:04,464 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 34 [2021-11-21 02:01:05,402 INFO L354 Elim1Store]: treesize reduction 40, result has 7.0 percent of original size [2021-11-21 02:01:05,402 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 37 treesize of output 23 [2021-11-21 02:01:05,414 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 02:01:05,414 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 02:01:05,676 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 56 treesize of output 50 [2021-11-21 02:01:05,900 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 02:01:05,900 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [264695209] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 02:01:05,900 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [691290469] [2021-11-21 02:01:05,901 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2021-11-21 02:01:05,901 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 02:01:05,901 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 02:01:05,901 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 02:01:05,902 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 02:01:05,983 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:01:05,984 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 02:01:06,259 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 20 treesize of output 16 [2021-11-21 02:01:06,630 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 02:01:06,630 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 180 treesize of output 179 [2021-11-21 02:01:07,242 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 02:01:07,556 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 20 treesize of output 16 [2021-11-21 02:01:07,810 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 02:01:07,810 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 69 treesize of output 68 [2021-11-21 02:01:08,126 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 02:01:08,327 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 14 treesize of output 10 [2021-11-21 02:01:08,431 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 02:01:08,431 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-21 02:01:33,495 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 02:01:42,345 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 02:01:42,345 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 02:01:42,345 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 32 [2021-11-21 02:01:42,346 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1401225856] [2021-11-21 02:01:42,346 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 02:01:42,346 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-21 02:01:42,346 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 02:01:42,346 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-21 02:01:42,347 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=263, Invalid=3043, Unknown=0, NotChecked=0, Total=3306 [2021-11-21 02:01:42,347 INFO L87 Difference]: Start difference. First operand 371 states and 436 transitions. Second operand has 33 states, 33 states have (on average 3.212121212121212) internal successors, (106), 32 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) [2021-11-21 02:01:42,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 02:01:42,586 INFO L93 Difference]: Finished difference Result 388 states and 452 transitions. [2021-11-21 02:01:42,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-21 02:01:42,587 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 3.212121212121212) internal successors, (106), 32 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2021-11-21 02:01:42,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 02:01:42,589 INFO L225 Difference]: With dead ends: 388 [2021-11-21 02:01:42,589 INFO L226 Difference]: Without dead ends: 334 [2021-11-21 02:01:42,589 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1239 ImplicationChecksByTransitivity, 9.8s TimeCoverageRelationStatistics Valid=305, Invalid=3477, Unknown=0, NotChecked=0, Total=3782 [2021-11-21 02:01:42,590 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 40 mSDsluCounter, 299 mSDsCounter, 0 mSdLazyCounter, 169 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 279 SdHoareTripleChecker+Invalid, 225 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 169 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 47 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 02:01:42,590 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 279 Invalid, 225 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 169 Invalid, 0 Unknown, 47 Unchecked, 0.1s Time] [2021-11-21 02:01:42,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 334 states. [2021-11-21 02:01:42,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 334 to 334. [2021-11-21 02:01:42,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 334 states, 330 states have (on average 1.190909090909091) internal successors, (393), 333 states have internal predecessors, (393), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 02:01:42,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 334 states to 334 states and 393 transitions. [2021-11-21 02:01:42,598 INFO L78 Accepts]: Start accepts. Automaton has 334 states and 393 transitions. Word has length 43 [2021-11-21 02:01:42,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 02:01:42,598 INFO L470 AbstractCegarLoop]: Abstraction has 334 states and 393 transitions. [2021-11-21 02:01:42,599 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 3.212121212121212) internal successors, (106), 32 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) [2021-11-21 02:01:42,599 INFO L276 IsEmpty]: Start isEmpty. Operand 334 states and 393 transitions. [2021-11-21 02:01:42,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-21 02:01:42,600 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 02:01:42,600 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 02:01:42,648 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2021-11-21 02:01:42,825 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:01:42,825 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-21 02:01:42,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 02:01:42,826 INFO L85 PathProgramCache]: Analyzing trace with hash 1376230790, now seen corresponding path program 5 times [2021-11-21 02:01:42,826 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 02:01:42,826 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1627748285] [2021-11-21 02:01:42,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 02:01:42,826 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 02:01:42,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 02:01:43,786 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 11 proven. 46 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 02:01:43,787 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 02:01:43,787 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1627748285] [2021-11-21 02:01:43,787 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1627748285] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 02:01:43,787 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1369825786] [2021-11-21 02:01:43,787 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 02:01:43,788 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:01:43,788 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 02:01:43,788 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 02:01:43,789 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6a009d37-f080-449a-858c-ea5bb09debf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-21 02:01:43,902 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-21 02:01:43,902 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 02:01:43,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 59 conjunts are in the unsatisfiable core [2021-11-21 02:01:43,906 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 02:01:43,911 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-21 02:01:44,255 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-21 02:01:44,330 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 02:01:44,330 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 34 [2021-11-21 02:01:45,302 INFO L354 Elim1Store]: treesize reduction 42, result has 6.7 percent of original size [2021-11-21 02:01:45,302 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 38 treesize of output 23 [2021-11-21 02:01:45,313 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 11 proven. 37 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 02:01:45,314 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 02:01:48,805 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 56 treesize of output 50 [2021-11-21 02:01:49,178 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 11 proven. 37 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 02:01:49,179 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1369825786] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 02:01:49,179 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [881824104] [2021-11-21 02:01:49,180 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-21 02:01:49,180 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 02:01:49,180 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 02:01:49,180 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 02:01:49,181 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 02:01:49,237 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:01:49,237 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-21 02:01:49,430 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 20 treesize of output 16 [2021-11-21 02:01:49,877 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 02:01:49,877 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 180 treesize of output 179 [2021-11-21 02:01:50,347 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 02:01:50,558 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 02:01:50,835 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:01:50,836 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 74 treesize of output 66 [2021-11-21 02:01:51,112 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 23 treesize of output 19 [2021-11-21 02:01:51,285 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 14 treesize of output 10 [2021-11-21 02:01:51,470 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-21 02:01:51,471 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-21 02:02:03,641 INFO L180 IcfgInterpreter]: Interpretation finished