./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memcleanup.prp --file ../../sv-benchmarks/c/memsafety-bftpd/bftpd_2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (memcleanup) Using default analysis Version 9ad7fb26 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/memsafety-bftpd/bftpd_2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/config/svcomp-MemCleanup-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-memcleanup) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 7c883b81b24ce5a721aa9a1ff13aef8a0d532ba87d9e130e470a0b88a1f8e93e --- Real Ultimate output --- This is Ultimate 0.2.1-dev-9ad7fb2 [2021-11-03 05:43:34,075 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-03 05:43:34,077 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-03 05:43:34,116 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-03 05:43:34,116 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-03 05:43:34,118 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-03 05:43:34,120 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-03 05:43:34,124 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-03 05:43:34,127 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-03 05:43:34,128 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-03 05:43:34,130 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-03 05:43:34,132 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-03 05:43:34,132 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-03 05:43:34,134 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-03 05:43:34,136 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-03 05:43:34,138 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-03 05:43:34,139 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-03 05:43:34,143 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-03 05:43:34,146 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-03 05:43:34,149 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-03 05:43:34,152 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-03 05:43:34,161 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-03 05:43:34,163 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-03 05:43:34,164 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-03 05:43:34,177 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-03 05:43:34,178 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-03 05:43:34,179 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-03 05:43:34,181 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-03 05:43:34,182 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-03 05:43:34,184 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-03 05:43:34,189 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-03 05:43:34,191 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-03 05:43:34,193 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-03 05:43:34,195 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-03 05:43:34,197 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-03 05:43:34,197 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-03 05:43:34,198 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-03 05:43:34,199 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-03 05:43:34,199 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-03 05:43:34,200 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-03 05:43:34,201 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-03 05:43:34,203 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/config/svcomp-MemCleanup-32bit-Taipan_Default.epf [2021-11-03 05:43:34,240 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-03 05:43:34,240 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-03 05:43:34,241 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-03 05:43:34,242 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-03 05:43:34,242 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-03 05:43:34,242 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-03 05:43:34,243 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-03 05:43:34,243 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-03 05:43:34,243 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-03 05:43:34,244 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-03 05:43:34,244 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-03 05:43:34,244 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-03 05:43:34,245 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-03 05:43:34,245 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-03 05:43:34,245 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-03 05:43:34,246 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-03 05:43:34,246 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-03 05:43:34,247 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-03 05:43:34,247 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-03 05:43:34,247 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-03 05:43:34,248 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-03 05:43:34,248 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-03 05:43:34,248 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-03 05:43:34,249 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-03 05:43:34,249 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-03 05:43:34,249 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-03 05:43:34,249 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-03 05:43:34,250 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-03 05:43:34,250 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-03 05:43:34,250 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-03 05:43:34,251 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-03 05:43:34,251 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-03 05:43:34,251 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-03 05:43:34,252 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-03 05:43:34,252 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-03 05:43:34,252 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-03 05:43:34,253 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-03 05:43:34,253 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-03 05:43:34,253 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_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-memcleanup) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 7c883b81b24ce5a721aa9a1ff13aef8a0d532ba87d9e130e470a0b88a1f8e93e [2021-11-03 05:43:34,565 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-03 05:43:34,604 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-03 05:43:34,607 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-03 05:43:34,609 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-03 05:43:34,610 INFO L275 PluginConnector]: CDTParser initialized [2021-11-03 05:43:34,612 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/../../sv-benchmarks/c/memsafety-bftpd/bftpd_2.i [2021-11-03 05:43:34,707 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/data/7f70a29e7/05fb219ac87d4ba889767cc8478992d9/FLAG4bf6de67d [2021-11-03 05:43:35,551 INFO L306 CDTParser]: Found 1 translation units. [2021-11-03 05:43:35,552 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/sv-benchmarks/c/memsafety-bftpd/bftpd_2.i [2021-11-03 05:43:35,587 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/data/7f70a29e7/05fb219ac87d4ba889767cc8478992d9/FLAG4bf6de67d [2021-11-03 05:43:35,745 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/data/7f70a29e7/05fb219ac87d4ba889767cc8478992d9 [2021-11-03 05:43:35,748 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-03 05:43:35,750 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-03 05:43:35,752 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-03 05:43:35,753 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-03 05:43:35,757 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-03 05:43:35,758 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 05:43:35" (1/1) ... [2021-11-03 05:43:35,760 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@611e1aae and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:43:35, skipping insertion in model container [2021-11-03 05:43:35,760 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 05:43:35" (1/1) ... [2021-11-03 05:43:35,769 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-03 05:43:35,822 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-03 05:43:36,364 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-03 05:43:36,389 INFO L203 MainTranslator]: Completed pre-run [2021-11-03 05:43:36,495 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-03 05:43:36,561 INFO L208 MainTranslator]: Completed translation [2021-11-03 05:43:36,561 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:43:36 WrapperNode [2021-11-03 05:43:36,562 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-03 05:43:36,563 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-03 05:43:36,563 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-03 05:43:36,563 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-03 05:43:36,573 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:43:36" (1/1) ... [2021-11-03 05:43:36,594 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:43:36" (1/1) ... [2021-11-03 05:43:36,636 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-03 05:43:36,637 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-03 05:43:36,637 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-03 05:43:36,637 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-03 05:43:36,648 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:43:36" (1/1) ... [2021-11-03 05:43:36,648 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:43:36" (1/1) ... [2021-11-03 05:43:36,657 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:43:36" (1/1) ... [2021-11-03 05:43:36,657 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:43:36" (1/1) ... [2021-11-03 05:43:36,673 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:43:36" (1/1) ... [2021-11-03 05:43:36,679 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:43:36" (1/1) ... [2021-11-03 05:43:36,683 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:43:36" (1/1) ... [2021-11-03 05:43:36,688 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-03 05:43:36,690 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-03 05:43:36,690 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-03 05:43:36,690 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-03 05:43:36,691 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:43:36" (1/1) ... [2021-11-03 05:43:36,716 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-03 05:43:36,731 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:43:36,745 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-03 05:43:36,751 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-03 05:43:36,795 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-03 05:43:36,795 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-03 05:43:36,795 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-03 05:43:36,796 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-03 05:43:36,796 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-03 05:43:36,796 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-11-03 05:43:36,796 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-03 05:43:36,797 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-03 05:43:36,797 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-03 05:43:37,659 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-03 05:43:37,660 INFO L299 CfgBuilder]: Removed 31 assume(true) statements. [2021-11-03 05:43:37,664 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 05:43:37 BoogieIcfgContainer [2021-11-03 05:43:37,664 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-03 05:43:37,666 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-03 05:43:37,667 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-03 05:43:37,671 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-03 05:43:37,671 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.11 05:43:35" (1/3) ... [2021-11-03 05:43:37,672 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2b4edb1c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 05:43:37, skipping insertion in model container [2021-11-03 05:43:37,673 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:43:36" (2/3) ... [2021-11-03 05:43:37,673 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2b4edb1c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 05:43:37, skipping insertion in model container [2021-11-03 05:43:37,673 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 05:43:37" (3/3) ... [2021-11-03 05:43:37,675 INFO L111 eAbstractionObserver]: Analyzing ICFG bftpd_2.i [2021-11-03 05:43:37,682 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-03 05:43:37,682 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 58 error locations. [2021-11-03 05:43:37,739 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-03 05:43:37,747 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 [2021-11-03 05:43:37,747 INFO L340 AbstractCegarLoop]: Starting to check reachability of 58 error locations. [2021-11-03 05:43:37,769 INFO L276 IsEmpty]: Start isEmpty. Operand has 142 states, 83 states have (on average 1.9518072289156627) internal successors, (162), 141 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) [2021-11-03 05:43:37,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-11-03 05:43:37,776 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:43:37,776 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-11-03 05:43:37,777 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-03 05:43:37,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:43:37,784 INFO L85 PathProgramCache]: Analyzing trace with hash 290544, now seen corresponding path program 1 times [2021-11-03 05:43:37,796 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:43:37,796 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [545888579] [2021-11-03 05:43:37,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:43:37,798 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:43:37,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:43:38,146 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:43:38,148 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:43:38,148 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [545888579] [2021-11-03 05:43:38,149 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [545888579] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 05:43:38,150 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:43:38,150 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-03 05:43:38,152 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1394410614] [2021-11-03 05:43:38,158 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-03 05:43:38,159 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:43:38,181 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-03 05:43:38,182 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 05:43:38,187 INFO L87 Difference]: Start difference. First operand has 142 states, 83 states have (on average 1.9518072289156627) internal successors, (162), 141 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) 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) [2021-11-03 05:43:38,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:43:38,449 INFO L93 Difference]: Finished difference Result 153 states and 174 transitions. [2021-11-03 05:43:38,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-03 05:43:38,453 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 [2021-11-03 05:43:38,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:43:38,468 INFO L225 Difference]: With dead ends: 153 [2021-11-03 05:43:38,468 INFO L226 Difference]: Without dead ends: 151 [2021-11-03 05:43:38,471 INFO L786 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 [2021-11-03 05:43:38,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2021-11-03 05:43:38,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 144. [2021-11-03 05:43:38,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 93 states have (on average 1.8064516129032258) internal successors, (168), 143 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:43:38,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 168 transitions. [2021-11-03 05:43:38,557 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 168 transitions. Word has length 3 [2021-11-03 05:43:38,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:43:38,558 INFO L470 AbstractCegarLoop]: Abstraction has 144 states and 168 transitions. [2021-11-03 05:43:38,558 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) [2021-11-03 05:43:38,559 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 168 transitions. [2021-11-03 05:43:38,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-11-03 05:43:38,559 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:43:38,560 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-11-03 05:43:38,560 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-03 05:43:38,561 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-03 05:43:38,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:43:38,565 INFO L85 PathProgramCache]: Analyzing trace with hash 290545, now seen corresponding path program 1 times [2021-11-03 05:43:38,565 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:43:38,566 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [819366122] [2021-11-03 05:43:38,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:43:38,566 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:43:38,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:43:38,693 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:43:38,694 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:43:38,694 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [819366122] [2021-11-03 05:43:38,695 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [819366122] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 05:43:38,695 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:43:38,695 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-03 05:43:38,696 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [141922100] [2021-11-03 05:43:38,697 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-03 05:43:38,697 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:43:38,699 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-03 05:43:38,699 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 05:43:38,700 INFO L87 Difference]: Start difference. First operand 144 states and 168 transitions. 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) [2021-11-03 05:43:38,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:43:38,962 INFO L93 Difference]: Finished difference Result 249 states and 284 transitions. [2021-11-03 05:43:38,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-03 05:43:38,964 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 [2021-11-03 05:43:38,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:43:38,974 INFO L225 Difference]: With dead ends: 249 [2021-11-03 05:43:38,974 INFO L226 Difference]: Without dead ends: 249 [2021-11-03 05:43:38,975 INFO L786 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 [2021-11-03 05:43:38,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2021-11-03 05:43:39,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 202. [2021-11-03 05:43:39,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 151 states have (on average 1.7350993377483444) internal successors, (262), 201 states have internal predecessors, (262), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:43:39,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 262 transitions. [2021-11-03 05:43:39,018 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 262 transitions. Word has length 3 [2021-11-03 05:43:39,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:43:39,018 INFO L470 AbstractCegarLoop]: Abstraction has 202 states and 262 transitions. [2021-11-03 05:43:39,019 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) [2021-11-03 05:43:39,019 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 262 transitions. [2021-11-03 05:43:39,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-03 05:43:39,020 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:43:39,020 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-03 05:43:39,020 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-03 05:43:39,021 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-03 05:43:39,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:43:39,022 INFO L85 PathProgramCache]: Analyzing trace with hash 9006847, now seen corresponding path program 1 times [2021-11-03 05:43:39,022 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:43:39,022 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2141394588] [2021-11-03 05:43:39,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:43:39,023 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:43:39,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:43:39,324 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:43:39,324 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:43:39,325 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2141394588] [2021-11-03 05:43:39,325 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2141394588] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 05:43:39,325 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:43:39,326 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-03 05:43:39,326 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1065652906] [2021-11-03 05:43:39,326 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-03 05:43:39,327 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:43:39,328 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-03 05:43:39,328 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-03 05:43:39,328 INFO L87 Difference]: Start difference. First operand 202 states and 262 transitions. Second operand has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:43:39,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:43:39,607 INFO L93 Difference]: Finished difference Result 220 states and 275 transitions. [2021-11-03 05:43:39,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-03 05:43:39,608 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2021-11-03 05:43:39,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:43:39,610 INFO L225 Difference]: With dead ends: 220 [2021-11-03 05:43:39,610 INFO L226 Difference]: Without dead ends: 220 [2021-11-03 05:43:39,611 INFO L786 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 [2021-11-03 05:43:39,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2021-11-03 05:43:39,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 202. [2021-11-03 05:43:39,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 151 states have (on average 1.728476821192053) internal successors, (261), 201 states have internal predecessors, (261), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:43:39,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 261 transitions. [2021-11-03 05:43:39,624 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 261 transitions. Word has length 4 [2021-11-03 05:43:39,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:43:39,625 INFO L470 AbstractCegarLoop]: Abstraction has 202 states and 261 transitions. [2021-11-03 05:43:39,625 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:43:39,626 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 261 transitions. [2021-11-03 05:43:39,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-03 05:43:39,626 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:43:39,626 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-03 05:43:39,627 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-03 05:43:39,627 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr3ASSERT_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-03 05:43:39,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:43:39,628 INFO L85 PathProgramCache]: Analyzing trace with hash 279212304, now seen corresponding path program 1 times [2021-11-03 05:43:39,628 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:43:39,629 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1032324754] [2021-11-03 05:43:39,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:43:39,629 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:43:39,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:43:39,926 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:43:39,927 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:43:39,927 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1032324754] [2021-11-03 05:43:39,928 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1032324754] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 05:43:39,929 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:43:39,929 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-03 05:43:39,936 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1975404923] [2021-11-03 05:43:39,937 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-03 05:43:39,937 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:43:39,939 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-03 05:43:39,939 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-03 05:43:39,940 INFO L87 Difference]: Start difference. First operand 202 states and 261 transitions. Second operand has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:43:40,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:43:40,171 INFO L93 Difference]: Finished difference Result 211 states and 261 transitions. [2021-11-03 05:43:40,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-03 05:43:40,171 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2021-11-03 05:43:40,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:43:40,174 INFO L225 Difference]: With dead ends: 211 [2021-11-03 05:43:40,174 INFO L226 Difference]: Without dead ends: 211 [2021-11-03 05:43:40,174 INFO L786 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 [2021-11-03 05:43:40,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2021-11-03 05:43:40,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 202. [2021-11-03 05:43:40,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 151 states have (on average 1.7218543046357615) internal successors, (260), 201 states have internal predecessors, (260), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:43:40,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 260 transitions. [2021-11-03 05:43:40,197 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 260 transitions. Word has length 5 [2021-11-03 05:43:40,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:43:40,199 INFO L470 AbstractCegarLoop]: Abstraction has 202 states and 260 transitions. [2021-11-03 05:43:40,199 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:43:40,199 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 260 transitions. [2021-11-03 05:43:40,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-03 05:43:40,200 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:43:40,200 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-03 05:43:40,200 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-03 05:43:40,200 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-03 05:43:40,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:43:40,201 INFO L85 PathProgramCache]: Analyzing trace with hash 65646881, now seen corresponding path program 1 times [2021-11-03 05:43:40,201 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:43:40,202 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [850430510] [2021-11-03 05:43:40,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:43:40,202 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:43:40,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:43:40,298 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:43:40,298 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:43:40,298 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [850430510] [2021-11-03 05:43:40,299 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [850430510] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 05:43:40,299 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:43:40,299 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-03 05:43:40,299 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1771269967] [2021-11-03 05:43:40,300 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-03 05:43:40,300 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:43:40,301 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-03 05:43:40,302 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-03 05:43:40,302 INFO L87 Difference]: Start difference. First operand 202 states and 260 transitions. Second operand has 4 states, 3 states have (on average 2.0) 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) [2021-11-03 05:43:40,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:43:40,406 INFO L93 Difference]: Finished difference Result 223 states and 281 transitions. [2021-11-03 05:43:40,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-03 05:43:40,407 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.0) 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 [2021-11-03 05:43:40,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:43:40,409 INFO L225 Difference]: With dead ends: 223 [2021-11-03 05:43:40,409 INFO L226 Difference]: Without dead ends: 223 [2021-11-03 05:43:40,410 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-03 05:43:40,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2021-11-03 05:43:40,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 211. [2021-11-03 05:43:40,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 211 states, 161 states have (on average 1.7142857142857142) internal successors, (276), 210 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) [2021-11-03 05:43:40,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 276 transitions. [2021-11-03 05:43:40,424 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 276 transitions. Word has length 6 [2021-11-03 05:43:40,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:43:40,424 INFO L470 AbstractCegarLoop]: Abstraction has 211 states and 276 transitions. [2021-11-03 05:43:40,425 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.0) 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) [2021-11-03 05:43:40,425 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 276 transitions. [2021-11-03 05:43:40,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-03 05:43:40,426 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:43:40,426 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:43:40,426 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-03 05:43:40,426 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr5ASSERT_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-03 05:43:40,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:43:40,427 INFO L85 PathProgramCache]: Analyzing trace with hash 2035053362, now seen corresponding path program 1 times [2021-11-03 05:43:40,427 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:43:40,428 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2055826930] [2021-11-03 05:43:40,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:43:40,430 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:43:40,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:43:40,531 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:43:40,532 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:43:40,532 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2055826930] [2021-11-03 05:43:40,532 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2055826930] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 05:43:40,532 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:43:40,533 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-03 05:43:40,533 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [120883321] [2021-11-03 05:43:40,533 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-03 05:43:40,534 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:43:40,534 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-03 05:43:40,534 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 05:43:40,535 INFO L87 Difference]: Start difference. First operand 211 states and 276 transitions. Second operand has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:43:40,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:43:40,608 INFO L93 Difference]: Finished difference Result 214 states and 278 transitions. [2021-11-03 05:43:40,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-03 05:43:40,609 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-03 05:43:40,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:43:40,611 INFO L225 Difference]: With dead ends: 214 [2021-11-03 05:43:40,611 INFO L226 Difference]: Without dead ends: 214 [2021-11-03 05:43:40,612 INFO L786 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 [2021-11-03 05:43:40,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2021-11-03 05:43:40,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 210. [2021-11-03 05:43:40,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 210 states, 161 states have (on average 1.7018633540372672) internal successors, (274), 209 states have internal predecessors, (274), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:43:40,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 274 transitions. [2021-11-03 05:43:40,619 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 274 transitions. Word has length 7 [2021-11-03 05:43:40,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:43:40,619 INFO L470 AbstractCegarLoop]: Abstraction has 210 states and 274 transitions. [2021-11-03 05:43:40,619 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:43:40,620 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 274 transitions. [2021-11-03 05:43:40,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-03 05:43:40,620 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:43:40,621 INFO L513 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:43:40,621 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-03 05:43:40,621 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-03 05:43:40,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:43:40,622 INFO L85 PathProgramCache]: Analyzing trace with hash 1255185624, now seen corresponding path program 1 times [2021-11-03 05:43:40,622 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:43:40,628 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [393576606] [2021-11-03 05:43:40,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:43:40,629 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:43:40,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:43:40,790 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:43:40,791 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:43:40,791 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [393576606] [2021-11-03 05:43:40,791 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [393576606] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:43:40,792 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1037810074] [2021-11-03 05:43:40,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:43:40,793 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:43:40,793 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:43:40,798 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:43:40,817 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-03 05:43:40,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:43:40,898 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-03 05:43:40,904 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:43:41,158 INFO L354 Elim1Store]: treesize reduction 240, result has 16.1 percent of original size [2021-11-03 05:43:41,159 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 5 case distinctions, treesize of input 21 treesize of output 51 [2021-11-03 05:43:41,491 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:43:41,491 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:43:41,662 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:43:41,663 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1037810074] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:43:41,663 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [433292280] [2021-11-03 05:43:41,688 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:43:41,688 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:43:41,697 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:43:41,704 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:43:41,705 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:43:41,781 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:43:41,794 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:43:41,795 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:43:41,796 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 118 [2021-11-03 05:43:41,797 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:43:41,798 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:43:41,799 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-03 05:43:41,820 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 507 [2021-11-03 05:43:41,902 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_55|], 78=[|v_#valid_87|]} [2021-11-03 05:43:41,938 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:43:41,940 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:43:41,943 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:43:41,946 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:43:41,949 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:43:41,951 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:43:41,954 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:43:41,956 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:43:41,960 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:43:41,963 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:43:41,966 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:43:41,969 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:43:41,971 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:43:41,974 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:43:41,977 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:43:42,034 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 22 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 31 [2021-11-03 05:43:42,035 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:43:42,036 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-11-03 05:43:42,037 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:43:42,042 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-11-03 05:43:42,043 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:43:42,064 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-03 05:43:42,065 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:43:42,065 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 05:43:42,066 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:43:42,066 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 05:43:42,067 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:43:42,089 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-03 05:43:42,089 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:43:42,090 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 05:43:42,091 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:43:42,091 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 05:43:42,091 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-11-03 05:43:42,110 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-03 05:43:42,111 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:43:42,111 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 05:43:42,112 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:43:42,112 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 05:43:42,112 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-11-03 05:43:42,115 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:42,195 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:43:42,206 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:43:42,209 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:43:42,213 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:43:42,214 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:43:42,216 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:43:42,217 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:43:42,219 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:43:42,220 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:43:42,221 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:43:42,224 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:43:42,230 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:43:42,231 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:43:42,234 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:43:42,236 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:43:42,242 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:43:42,243 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:43:42,245 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:43:42,267 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:43:42,269 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:43:42,270 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:43:42,274 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:43:42,279 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:43:42,281 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:43:42,283 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:43:42,286 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:43:42,287 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:43:42,288 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:43:42,289 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:43:42,357 INFO L354 Elim1Store]: treesize reduction 90, result has 15.1 percent of original size [2021-11-03 05:43:42,357 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 18 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 10 case distinctions, treesize of input 71 treesize of output 70 [2021-11-03 05:43:42,363 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:43:42,369 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:43:42,371 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:43:42,372 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:43:42,372 INFO L550 ElimStorePlain]: Start of recursive call 6: End of recursive call: and 1 xjuncts. [2021-11-03 05:43:42,375 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:42,443 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:43:42,474 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:43:42,503 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 403 [2021-11-03 05:43:42,504 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:43:42,505 INFO L247 ElimStorePlain]: Needed 6 recursive calls to eliminate 2 variables, input treesize:1853, output treesize:403 [2021-11-03 05:43:42,573 INFO L180 QuantifierPusher]: treesize reduction 3, result has 99.4 percent of original size [2021-11-03 05:43:42,600 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 478 [2021-11-03 05:43:42,625 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:43:42,649 INFO L185 QuantifierPusher]: treesize reduction 3, result has 99.3 percent of original size 452 [2021-11-03 05:43:42,689 INFO L180 QuantifierPusher]: treesize reduction 6, result has 98.8 percent of original size [2021-11-03 05:43:42,712 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 514 [2021-11-03 05:43:42,723 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:42,871 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:43,047 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:43,293 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:43:43,339 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1107 [2021-11-03 05:43:43,377 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:43:43,407 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1190 [2021-11-03 05:43:43,475 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:43:43,540 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1107 [2021-11-03 05:43:43,565 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:43,779 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:43,783 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:43,787 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:43,789 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:43,814 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:43,822 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:43,855 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:44,061 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:44,064 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:44,067 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:44,071 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:44,083 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:44,101 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:44,120 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:44,407 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:44,411 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:44,413 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:44,415 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:44,418 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:44,430 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:44,466 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:44,702 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:44,704 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:44,706 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:44,708 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:44,722 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:44,731 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:44,761 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:44,950 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:44,952 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:44,954 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:44,956 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:44,969 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:44,977 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:45,007 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:45,213 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:45,215 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:45,217 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:45,219 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:45,234 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:45,245 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:45,260 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:45,470 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:45,473 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:45,476 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:45,477 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:45,481 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:45,489 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:43:45,504 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:43:50,107 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:43:50,107 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:43:50,107 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 2, 2] total 6 [2021-11-03 05:43:50,108 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1590952425] [2021-11-03 05:43:50,108 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-03 05:43:50,108 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:43:50,109 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-03 05:43:50,109 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2021-11-03 05:43:50,110 INFO L87 Difference]: Start difference. First operand 210 states and 274 transitions. Second operand has 8 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 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) [2021-11-03 05:43:50,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:43:50,529 INFO L93 Difference]: Finished difference Result 370 states and 442 transitions. [2021-11-03 05:43:50,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-03 05:43:50,531 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 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 11 [2021-11-03 05:43:50,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:43:50,534 INFO L225 Difference]: With dead ends: 370 [2021-11-03 05:43:50,534 INFO L226 Difference]: Without dead ends: 370 [2021-11-03 05:43:50,535 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2021-11-03 05:43:50,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 370 states. [2021-11-03 05:43:50,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 370 to 224. [2021-11-03 05:43:50,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 224 states, 178 states have (on average 1.6404494382022472) internal successors, (292), 223 states have internal predecessors, (292), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:43:50,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 292 transitions. [2021-11-03 05:43:50,555 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 292 transitions. Word has length 11 [2021-11-03 05:43:50,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:43:50,555 INFO L470 AbstractCegarLoop]: Abstraction has 224 states and 292 transitions. [2021-11-03 05:43:50,555 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 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) [2021-11-03 05:43:50,556 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 292 transitions. [2021-11-03 05:43:50,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-03 05:43:50,556 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:43:50,557 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:43:50,587 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-03 05:43:50,777 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:43:50,777 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-03 05:43:50,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:43:50,778 INFO L85 PathProgramCache]: Analyzing trace with hash 256048632, now seen corresponding path program 1 times [2021-11-03 05:43:50,778 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:43:50,778 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1872889700] [2021-11-03 05:43:50,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:43:50,778 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:43:50,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:43:51,112 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:43:51,112 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:43:51,114 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1872889700] [2021-11-03 05:43:51,114 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1872889700] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:43:51,114 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [830289529] [2021-11-03 05:43:51,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:43:51,115 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:43:51,115 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:43:51,116 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:43:51,137 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-03 05:43:51,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:43:51,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-03 05:43:51,249 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:43:51,514 INFO L354 Elim1Store]: treesize reduction 497, result has 11.1 percent of original size [2021-11-03 05:43:51,515 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 7 case distinctions, treesize of input 99 treesize of output 131 [2021-11-03 05:43:59,357 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 90 treesize of output 66 [2021-11-03 05:44:00,017 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:44:00,018 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:44:00,092 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:44:00,093 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [830289529] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:44:00,093 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [353915239] [2021-11-03 05:44:00,101 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:44:00,102 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:44:00,102 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:44:00,102 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:44:00,103 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:44:00,120 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:00,122 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:44:00,129 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:00,130 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-03 05:44:00,131 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:44:00,131 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:00,132 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 118 [2021-11-03 05:44:00,140 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 507 [2021-11-03 05:44:00,165 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_56|], 78=[|v_#valid_89|]} [2021-11-03 05:44:00,182 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-03 05:44:00,183 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:00,183 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 05:44:00,184 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:00,186 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 05:44:00,186 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:44:00,203 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-03 05:44:00,204 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:00,206 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 05:44:00,206 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:00,213 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 05:44:00,213 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:44:00,237 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:00,240 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:00,243 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:00,246 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:00,250 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:00,253 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:00,256 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:00,260 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:00,264 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:00,268 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:00,271 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:00,275 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:00,278 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:00,281 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:00,284 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:00,331 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 22 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 31 [2021-11-03 05:44:00,333 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:00,334 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-11-03 05:44:00,335 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:00,335 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-11-03 05:44:00,336 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-11-03 05:44:00,351 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-03 05:44:00,352 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:00,352 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 05:44:00,353 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:00,354 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 05:44:00,354 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-11-03 05:44:00,355 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:00,389 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:00,397 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:00,399 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:00,400 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:00,403 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:00,407 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:00,408 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:00,410 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:00,411 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:00,412 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:00,414 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:00,415 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:00,416 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:00,418 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:00,420 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:00,421 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:00,425 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:00,427 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:00,441 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:00,442 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:00,443 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:00,457 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:00,463 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:00,464 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:00,469 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:00,471 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:00,472 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:00,473 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:00,475 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:00,525 INFO L354 Elim1Store]: treesize reduction 90, result has 15.1 percent of original size [2021-11-03 05:44:00,526 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 18 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 10 case distinctions, treesize of input 71 treesize of output 70 [2021-11-03 05:44:00,534 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:00,541 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:44:00,542 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:00,543 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:44:00,543 INFO L550 ElimStorePlain]: Start of recursive call 6: End of recursive call: and 1 xjuncts. [2021-11-03 05:44:00,544 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:00,574 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:00,582 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:00,590 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 403 [2021-11-03 05:44:00,591 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:44:00,592 INFO L247 ElimStorePlain]: Needed 6 recursive calls to eliminate 2 variables, input treesize:1853, output treesize:403 [2021-11-03 05:44:00,644 INFO L180 QuantifierPusher]: treesize reduction 3, result has 99.4 percent of original size [2021-11-03 05:44:00,658 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 478 [2021-11-03 05:44:00,671 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:00,683 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 485 [2021-11-03 05:44:00,701 INFO L180 QuantifierPusher]: treesize reduction 23, result has 95.8 percent of original size [2021-11-03 05:44:00,715 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 527 [2021-11-03 05:44:00,723 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:00,812 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:00,914 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:01,088 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:01,138 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1117 [2021-11-03 05:44:01,176 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:01,203 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1197 [2021-11-03 05:44:01,272 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:01,321 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1117 [2021-11-03 05:44:01,345 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:01,508 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:01,510 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:01,512 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:01,513 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:01,530 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:01,537 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:01,562 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:01,714 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:01,716 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:01,717 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:01,719 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:01,726 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:01,734 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:01,761 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:01,910 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:01,912 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:01,914 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:01,916 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:01,924 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:01,932 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:01,943 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:02,099 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:02,101 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:02,103 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:02,105 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:02,108 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:02,115 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:02,142 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:02,322 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:02,324 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:02,326 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:02,328 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:02,336 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:02,344 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:02,374 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:02,550 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:02,553 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:02,555 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:02,557 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:02,565 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:02,573 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:02,585 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:02,761 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:02,763 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:02,766 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:02,768 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:02,771 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:02,779 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:02,796 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:44:05,626 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:44:05,627 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:44:05,627 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 3, 3] total 11 [2021-11-03 05:44:05,627 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [955807678] [2021-11-03 05:44:05,628 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-03 05:44:05,628 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:44:05,629 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-03 05:44:05,629 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=284, Unknown=0, NotChecked=0, Total=342 [2021-11-03 05:44:05,630 INFO L87 Difference]: Start difference. First operand 224 states and 292 transitions. Second operand has 13 states, 12 states have (on average 2.9166666666666665) internal successors, (35), 12 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:44:09,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:44:09,762 INFO L93 Difference]: Finished difference Result 800 states and 1011 transitions. [2021-11-03 05:44:09,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-03 05:44:09,763 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.9166666666666665) internal successors, (35), 12 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-03 05:44:09,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:44:09,770 INFO L225 Difference]: With dead ends: 800 [2021-11-03 05:44:09,770 INFO L226 Difference]: Without dead ends: 800 [2021-11-03 05:44:09,771 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 138 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=111, Invalid=489, Unknown=0, NotChecked=0, Total=600 [2021-11-03 05:44:09,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 800 states. [2021-11-03 05:44:09,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 800 to 366. [2021-11-03 05:44:09,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 366 states, 321 states have (on average 1.6105919003115265) internal successors, (517), 365 states have internal predecessors, (517), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:44:09,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 366 states to 366 states and 517 transitions. [2021-11-03 05:44:09,790 INFO L78 Accepts]: Start accepts. Automaton has 366 states and 517 transitions. Word has length 12 [2021-11-03 05:44:09,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:44:09,791 INFO L470 AbstractCegarLoop]: Abstraction has 366 states and 517 transitions. [2021-11-03 05:44:09,791 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 2.9166666666666665) internal successors, (35), 12 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:44:09,791 INFO L276 IsEmpty]: Start isEmpty. Operand 366 states and 517 transitions. [2021-11-03 05:44:09,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-03 05:44:09,792 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:44:09,792 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:44:09,843 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-03 05:44:10,017 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:44:10,017 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr3ASSERT_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-03 05:44:10,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:44:10,018 INFO L85 PathProgramCache]: Analyzing trace with hash -652426953, now seen corresponding path program 1 times [2021-11-03 05:44:10,018 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:44:10,018 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [815152] [2021-11-03 05:44:10,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:44:10,018 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:44:10,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:44:10,298 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:44:10,298 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:44:10,299 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [815152] [2021-11-03 05:44:10,299 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [815152] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:44:10,299 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [78483138] [2021-11-03 05:44:10,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:44:10,300 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:44:10,300 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:44:10,301 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:44:10,329 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-03 05:44:10,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:44:10,509 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-03 05:44:10,511 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:44:10,682 INFO L354 Elim1Store]: treesize reduction 354, result has 14.1 percent of original size [2021-11-03 05:44:10,682 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 5 case distinctions, treesize of input 48 treesize of output 83 [2021-11-03 05:44:10,693 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 131 treesize of output 127 [2021-11-03 05:44:13,039 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 86 treesize of output 62 [2021-11-03 05:44:13,049 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 59 treesize of output 47 [2021-11-03 05:44:13,827 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:44:13,827 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:44:13,987 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:44:13,987 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [78483138] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:44:13,988 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [750909869] [2021-11-03 05:44:13,991 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-03 05:44:13,991 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:44:13,991 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:44:13,992 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:44:13,992 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:44:14,006 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:14,008 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:44:14,009 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:14,009 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 118 [2021-11-03 05:44:14,010 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:44:14,011 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:14,013 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-03 05:44:14,020 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 507 [2021-11-03 05:44:14,031 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_58|], 78=[|v_#valid_91|]} [2021-11-03 05:44:14,045 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-03 05:44:14,046 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:14,047 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 05:44:14,047 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:14,048 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 05:44:14,048 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:44:14,071 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:14,074 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:14,078 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:14,080 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:14,083 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:14,085 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:14,088 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:14,090 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:14,092 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:14,094 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:14,096 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:14,098 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:14,100 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:14,102 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:14,104 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:14,134 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 22 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 31 [2021-11-03 05:44:14,148 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:14,149 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-11-03 05:44:14,150 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:14,150 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-11-03 05:44:14,151 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:44:14,166 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-03 05:44:14,167 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:14,168 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 05:44:14,168 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:14,169 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 05:44:14,169 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-11-03 05:44:14,183 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-03 05:44:14,184 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:14,185 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 05:44:14,185 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:14,186 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 05:44:14,186 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-11-03 05:44:14,187 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:14,214 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:14,222 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:14,224 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:14,225 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:14,227 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:14,229 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:14,231 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:14,233 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:14,235 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:14,238 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:14,240 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:14,242 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:14,244 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:14,245 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:14,247 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:14,249 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:14,250 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:14,251 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:14,264 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:14,265 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:14,266 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:14,268 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:14,273 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:14,274 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:14,276 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:14,278 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:14,279 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:14,281 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:14,282 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:14,340 INFO L354 Elim1Store]: treesize reduction 90, result has 15.1 percent of original size [2021-11-03 05:44:14,341 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 18 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 10 case distinctions, treesize of input 71 treesize of output 70 [2021-11-03 05:44:14,342 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:14,346 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:44:14,349 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:14,349 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:44:14,350 INFO L550 ElimStorePlain]: Start of recursive call 6: End of recursive call: and 1 xjuncts. [2021-11-03 05:44:14,351 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:14,377 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:14,383 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:14,391 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 403 [2021-11-03 05:44:14,392 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:44:14,393 INFO L247 ElimStorePlain]: Needed 6 recursive calls to eliminate 2 variables, input treesize:1853, output treesize:403 [2021-11-03 05:44:14,436 INFO L180 QuantifierPusher]: treesize reduction 3, result has 99.4 percent of original size [2021-11-03 05:44:14,447 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 478 [2021-11-03 05:44:14,458 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:14,489 INFO L185 QuantifierPusher]: treesize reduction 3, result has 99.3 percent of original size 452 [2021-11-03 05:44:14,506 INFO L180 QuantifierPusher]: treesize reduction 6, result has 98.8 percent of original size [2021-11-03 05:44:14,517 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 514 [2021-11-03 05:44:14,525 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:14,615 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:14,705 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:14,865 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:14,902 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1107 [2021-11-03 05:44:14,929 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:14,953 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1190 [2021-11-03 05:44:15,009 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:15,056 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1107 [2021-11-03 05:44:15,076 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:15,210 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:15,212 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:15,213 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:15,215 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:15,222 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:15,228 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:15,255 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:15,418 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:15,420 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:15,422 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:15,424 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:15,430 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:15,437 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:15,463 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:15,608 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:15,610 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:15,612 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:15,614 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:15,622 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:15,628 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:15,654 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:15,844 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:15,846 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:15,848 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:15,850 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:15,857 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:15,864 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:15,874 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:16,012 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:16,014 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:16,017 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:16,019 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:16,021 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:16,027 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:16,054 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:16,210 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:16,212 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:16,214 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:16,215 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:16,225 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:16,231 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:16,241 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:16,379 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:16,381 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:16,383 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:16,385 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:16,387 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:16,394 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:16,406 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:44:20,163 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:44:20,164 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:44:20,164 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 3, 3] total 10 [2021-11-03 05:44:20,164 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [755915567] [2021-11-03 05:44:20,165 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-03 05:44:20,165 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:44:20,165 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-03 05:44:20,166 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2021-11-03 05:44:20,166 INFO L87 Difference]: Start difference. First operand 366 states and 517 transitions. Second operand has 12 states, 11 states have (on average 3.5454545454545454) internal successors, (39), 11 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:44:21,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:44:21,200 INFO L93 Difference]: Finished difference Result 829 states and 1023 transitions. [2021-11-03 05:44:21,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-03 05:44:21,201 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 3.5454545454545454) internal successors, (39), 11 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-11-03 05:44:21,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:44:21,207 INFO L225 Difference]: With dead ends: 829 [2021-11-03 05:44:21,208 INFO L226 Difference]: Without dead ends: 829 [2021-11-03 05:44:21,208 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=98, Invalid=454, Unknown=0, NotChecked=0, Total=552 [2021-11-03 05:44:21,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 829 states. [2021-11-03 05:44:21,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 829 to 402. [2021-11-03 05:44:21,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 402 states, 358 states have (on average 1.5921787709497206) internal successors, (570), 401 states have internal predecessors, (570), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:44:21,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 402 states to 402 states and 570 transitions. [2021-11-03 05:44:21,228 INFO L78 Accepts]: Start accepts. Automaton has 402 states and 570 transitions. Word has length 13 [2021-11-03 05:44:21,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:44:21,229 INFO L470 AbstractCegarLoop]: Abstraction has 402 states and 570 transitions. [2021-11-03 05:44:21,229 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 3.5454545454545454) internal successors, (39), 11 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:44:21,229 INFO L276 IsEmpty]: Start isEmpty. Operand 402 states and 570 transitions. [2021-11-03 05:44:21,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-03 05:44:21,230 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:44:21,230 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:44:21,263 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-03 05:44:21,449 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable116 [2021-11-03 05:44:21,449 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr10ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-03 05:44:21,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:44:21,450 INFO L85 PathProgramCache]: Analyzing trace with hash -1265049470, now seen corresponding path program 1 times [2021-11-03 05:44:21,450 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:44:21,450 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1580498253] [2021-11-03 05:44:21,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:44:21,451 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:44:21,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:44:21,503 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:44:21,504 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:44:21,504 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1580498253] [2021-11-03 05:44:21,504 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1580498253] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 05:44:21,504 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:44:21,504 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 05:44:21,504 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1432198123] [2021-11-03 05:44:21,505 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-03 05:44:21,505 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:44:21,505 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-03 05:44:21,506 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 05:44:21,506 INFO L87 Difference]: Start difference. First operand 402 states and 570 transitions. Second operand has 3 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) [2021-11-03 05:44:21,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:44:21,527 INFO L93 Difference]: Finished difference Result 360 states and 493 transitions. [2021-11-03 05:44:21,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-03 05:44:21,528 INFO L78 Accepts]: Start accepts. Automaton has has 3 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 [2021-11-03 05:44:21,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:44:21,531 INFO L225 Difference]: With dead ends: 360 [2021-11-03 05:44:21,531 INFO L226 Difference]: Without dead ends: 360 [2021-11-03 05:44:21,532 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 05:44:21,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 360 states. [2021-11-03 05:44:21,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 360 to 271. [2021-11-03 05:44:21,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 271 states, 245 states have (on average 1.5387755102040817) internal successors, (377), 270 states have internal predecessors, (377), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:44:21,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 271 states to 271 states and 377 transitions. [2021-11-03 05:44:21,558 INFO L78 Accepts]: Start accepts. Automaton has 271 states and 377 transitions. Word has length 14 [2021-11-03 05:44:21,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:44:21,558 INFO L470 AbstractCegarLoop]: Abstraction has 271 states and 377 transitions. [2021-11-03 05:44:21,559 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 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) [2021-11-03 05:44:21,559 INFO L276 IsEmpty]: Start isEmpty. Operand 271 states and 377 transitions. [2021-11-03 05:44:21,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-03 05:44:21,560 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:44:21,560 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:44:21,560 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable171 [2021-11-03 05:44:21,560 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr16ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-03 05:44:21,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:44:21,560 INFO L85 PathProgramCache]: Analyzing trace with hash -561212118, now seen corresponding path program 1 times [2021-11-03 05:44:21,561 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:44:21,561 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [858851954] [2021-11-03 05:44:21,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:44:21,561 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:44:21,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:44:21,600 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:44:21,600 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:44:21,600 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [858851954] [2021-11-03 05:44:21,600 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [858851954] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 05:44:21,601 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:44:21,601 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-03 05:44:21,601 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [647143488] [2021-11-03 05:44:21,602 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-03 05:44:21,602 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:44:21,602 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-03 05:44:21,603 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 05:44:21,603 INFO L87 Difference]: Start difference. First operand 271 states and 377 transitions. Second operand has 3 states, 3 states have (on average 5.0) internal successors, (15), 2 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) [2021-11-03 05:44:21,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:44:21,643 INFO L93 Difference]: Finished difference Result 372 states and 518 transitions. [2021-11-03 05:44:21,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-03 05:44:21,643 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 2 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 15 [2021-11-03 05:44:21,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:44:21,647 INFO L225 Difference]: With dead ends: 372 [2021-11-03 05:44:21,647 INFO L226 Difference]: Without dead ends: 372 [2021-11-03 05:44:21,648 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 05:44:21,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 372 states. [2021-11-03 05:44:21,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 372 to 352. [2021-11-03 05:44:21,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 352 states, 330 states have (on average 1.5545454545454545) internal successors, (513), 351 states have internal predecessors, (513), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:44:21,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 352 states to 352 states and 513 transitions. [2021-11-03 05:44:21,661 INFO L78 Accepts]: Start accepts. Automaton has 352 states and 513 transitions. Word has length 15 [2021-11-03 05:44:21,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:44:21,662 INFO L470 AbstractCegarLoop]: Abstraction has 352 states and 513 transitions. [2021-11-03 05:44:21,662 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 2 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) [2021-11-03 05:44:21,662 INFO L276 IsEmpty]: Start isEmpty. Operand 352 states and 513 transitions. [2021-11-03 05:44:21,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-03 05:44:21,663 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:44:21,664 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:44:21,664 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable172 [2021-11-03 05:44:21,664 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr20REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-03 05:44:21,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:44:21,665 INFO L85 PathProgramCache]: Analyzing trace with hash 1839629140, now seen corresponding path program 1 times [2021-11-03 05:44:21,665 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:44:21,665 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [802769767] [2021-11-03 05:44:21,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:44:21,666 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:44:21,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:44:21,714 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:44:21,714 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:44:21,714 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [802769767] [2021-11-03 05:44:21,715 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [802769767] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 05:44:21,715 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:44:21,715 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 05:44:21,715 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1524089892] [2021-11-03 05:44:21,716 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-03 05:44:21,716 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:44:21,717 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-03 05:44:21,717 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 05:44:21,717 INFO L87 Difference]: Start difference. First operand 352 states and 513 transitions. Second operand has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 3 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) [2021-11-03 05:44:21,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:44:21,734 INFO L93 Difference]: Finished difference Result 303 states and 398 transitions. [2021-11-03 05:44:21,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-03 05:44:21,735 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 3 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 17 [2021-11-03 05:44:21,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:44:21,737 INFO L225 Difference]: With dead ends: 303 [2021-11-03 05:44:21,738 INFO L226 Difference]: Without dead ends: 303 [2021-11-03 05:44:21,738 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 05:44:21,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 303 states. [2021-11-03 05:44:21,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 303 to 284. [2021-11-03 05:44:21,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 284 states, 262 states have (on average 1.5038167938931297) internal successors, (394), 283 states have internal predecessors, (394), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:44:21,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 284 states to 284 states and 394 transitions. [2021-11-03 05:44:21,749 INFO L78 Accepts]: Start accepts. Automaton has 284 states and 394 transitions. Word has length 17 [2021-11-03 05:44:21,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:44:21,749 INFO L470 AbstractCegarLoop]: Abstraction has 284 states and 394 transitions. [2021-11-03 05:44:21,750 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 3 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) [2021-11-03 05:44:21,750 INFO L276 IsEmpty]: Start isEmpty. Operand 284 states and 394 transitions. [2021-11-03 05:44:21,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-03 05:44:21,753 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:44:21,753 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:44:21,753 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable173 [2021-11-03 05:44:21,754 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr20REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-03 05:44:21,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:44:21,754 INFO L85 PathProgramCache]: Analyzing trace with hash -53162952, now seen corresponding path program 1 times [2021-11-03 05:44:21,755 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:44:21,755 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [62159817] [2021-11-03 05:44:21,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:44:21,755 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:44:21,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:44:21,908 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:44:21,908 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:44:21,908 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [62159817] [2021-11-03 05:44:21,909 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [62159817] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 05:44:21,909 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:44:21,909 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-03 05:44:21,912 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [482566889] [2021-11-03 05:44:21,913 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-03 05:44:21,913 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:44:21,914 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-03 05:44:21,914 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-03 05:44:21,915 INFO L87 Difference]: Start difference. First operand 284 states and 394 transitions. Second operand has 6 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:44:22,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:44:22,330 INFO L93 Difference]: Finished difference Result 399 states and 479 transitions. [2021-11-03 05:44:22,330 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-03 05:44:22,330 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-11-03 05:44:22,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:44:22,334 INFO L225 Difference]: With dead ends: 399 [2021-11-03 05:44:22,334 INFO L226 Difference]: Without dead ends: 399 [2021-11-03 05:44:22,334 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2021-11-03 05:44:22,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 399 states. [2021-11-03 05:44:22,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 399 to 299. [2021-11-03 05:44:22,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 299 states, 277 states have (on average 1.4512635379061372) internal successors, (402), 298 states have internal predecessors, (402), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:44:22,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 299 states to 299 states and 402 transitions. [2021-11-03 05:44:22,346 INFO L78 Accepts]: Start accepts. Automaton has 299 states and 402 transitions. Word has length 19 [2021-11-03 05:44:22,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:44:22,347 INFO L470 AbstractCegarLoop]: Abstraction has 299 states and 402 transitions. [2021-11-03 05:44:22,347 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:44:22,347 INFO L276 IsEmpty]: Start isEmpty. Operand 299 states and 402 transitions. [2021-11-03 05:44:22,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-03 05:44:22,354 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:44:22,354 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:44:22,354 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable174 [2021-11-03 05:44:22,355 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr23ASSERT_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-03 05:44:22,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:44:22,355 INFO L85 PathProgramCache]: Analyzing trace with hash 1901937109, now seen corresponding path program 1 times [2021-11-03 05:44:22,356 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:44:22,356 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1339999379] [2021-11-03 05:44:22,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:44:22,356 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:44:22,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:44:22,442 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:44:22,443 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:44:22,443 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1339999379] [2021-11-03 05:44:22,443 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1339999379] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 05:44:22,443 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:44:22,444 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 05:44:22,444 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [425784031] [2021-11-03 05:44:22,444 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-03 05:44:22,444 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:44:22,445 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-03 05:44:22,445 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-03 05:44:22,446 INFO L87 Difference]: Start difference. First operand 299 states and 402 transitions. Second operand has 5 states, 4 states have (on average 5.0) internal successors, (20), 4 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) [2021-11-03 05:44:22,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:44:22,561 INFO L93 Difference]: Finished difference Result 348 states and 451 transitions. [2021-11-03 05:44:22,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-03 05:44:22,562 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 5.0) internal successors, (20), 4 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 20 [2021-11-03 05:44:22,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:44:22,567 INFO L225 Difference]: With dead ends: 348 [2021-11-03 05:44:22,567 INFO L226 Difference]: Without dead ends: 348 [2021-11-03 05:44:22,568 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-03 05:44:22,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 348 states. [2021-11-03 05:44:22,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 348 to 298. [2021-11-03 05:44:22,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 298 states, 277 states have (on average 1.4332129963898916) internal successors, (397), 297 states have internal predecessors, (397), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:44:22,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 298 states to 298 states and 397 transitions. [2021-11-03 05:44:22,581 INFO L78 Accepts]: Start accepts. Automaton has 298 states and 397 transitions. Word has length 20 [2021-11-03 05:44:22,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:44:22,582 INFO L470 AbstractCegarLoop]: Abstraction has 298 states and 397 transitions. [2021-11-03 05:44:22,582 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 5.0) internal successors, (20), 4 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) [2021-11-03 05:44:22,582 INFO L276 IsEmpty]: Start isEmpty. Operand 298 states and 397 transitions. [2021-11-03 05:44:22,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-03 05:44:22,585 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:44:22,585 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:44:22,585 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable175 [2021-11-03 05:44:22,586 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr24ASSERT_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-03 05:44:22,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:44:22,586 INFO L85 PathProgramCache]: Analyzing trace with hash -1169491627, now seen corresponding path program 1 times [2021-11-03 05:44:22,586 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:44:22,587 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1835939539] [2021-11-03 05:44:22,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:44:22,587 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:44:22,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:44:22,741 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:44:22,741 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:44:22,742 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1835939539] [2021-11-03 05:44:22,742 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1835939539] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 05:44:22,742 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:44:22,742 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-03 05:44:22,742 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [974547739] [2021-11-03 05:44:22,743 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-03 05:44:22,743 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:44:22,744 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-03 05:44:22,744 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-03 05:44:22,744 INFO L87 Difference]: Start difference. First operand 298 states and 397 transitions. Second operand has 4 states, 3 states have (on average 7.0) internal successors, (21), 3 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) [2021-11-03 05:44:22,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:44:22,892 INFO L93 Difference]: Finished difference Result 315 states and 396 transitions. [2021-11-03 05:44:22,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-03 05:44:22,893 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 7.0) internal successors, (21), 3 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 21 [2021-11-03 05:44:22,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:44:22,895 INFO L225 Difference]: With dead ends: 315 [2021-11-03 05:44:22,896 INFO L226 Difference]: Without dead ends: 315 [2021-11-03 05:44:22,896 INFO L786 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 [2021-11-03 05:44:22,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 315 states. [2021-11-03 05:44:22,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 315 to 298. [2021-11-03 05:44:22,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 298 states, 277 states have (on average 1.4151624548736461) internal successors, (392), 297 states have internal predecessors, (392), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:44:22,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 298 states to 298 states and 392 transitions. [2021-11-03 05:44:22,913 INFO L78 Accepts]: Start accepts. Automaton has 298 states and 392 transitions. Word has length 21 [2021-11-03 05:44:22,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:44:22,913 INFO L470 AbstractCegarLoop]: Abstraction has 298 states and 392 transitions. [2021-11-03 05:44:22,913 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 7.0) internal successors, (21), 3 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) [2021-11-03 05:44:22,914 INFO L276 IsEmpty]: Start isEmpty. Operand 298 states and 392 transitions. [2021-11-03 05:44:22,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-03 05:44:22,915 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:44:22,915 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:44:22,916 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable176 [2021-11-03 05:44:22,916 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr22ASSERT_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-03 05:44:22,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:44:22,918 INFO L85 PathProgramCache]: Analyzing trace with hash 450012023, now seen corresponding path program 1 times [2021-11-03 05:44:22,918 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:44:22,919 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [548594675] [2021-11-03 05:44:22,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:44:22,919 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:44:22,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:44:23,266 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:44:23,267 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:44:23,267 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [548594675] [2021-11-03 05:44:23,267 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [548594675] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 05:44:23,267 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:44:23,267 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-03 05:44:23,268 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [208829581] [2021-11-03 05:44:23,268 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-03 05:44:23,268 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:44:23,269 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-03 05:44:23,269 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-03 05:44:23,269 INFO L87 Difference]: Start difference. First operand 298 states and 392 transitions. Second operand has 10 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 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) [2021-11-03 05:44:23,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:44:23,802 INFO L93 Difference]: Finished difference Result 366 states and 447 transitions. [2021-11-03 05:44:23,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-03 05:44:23,802 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 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 21 [2021-11-03 05:44:23,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:44:23,805 INFO L225 Difference]: With dead ends: 366 [2021-11-03 05:44:23,805 INFO L226 Difference]: Without dead ends: 366 [2021-11-03 05:44:23,806 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2021-11-03 05:44:23,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 366 states. [2021-11-03 05:44:23,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 366 to 249. [2021-11-03 05:44:23,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 249 states, 228 states have (on average 1.4035087719298245) internal successors, (320), 248 states have internal predecessors, (320), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:44:23,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 249 states to 249 states and 320 transitions. [2021-11-03 05:44:23,815 INFO L78 Accepts]: Start accepts. Automaton has 249 states and 320 transitions. Word has length 21 [2021-11-03 05:44:23,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:44:23,816 INFO L470 AbstractCegarLoop]: Abstraction has 249 states and 320 transitions. [2021-11-03 05:44:23,816 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 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) [2021-11-03 05:44:23,816 INFO L276 IsEmpty]: Start isEmpty. Operand 249 states and 320 transitions. [2021-11-03 05:44:23,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-03 05:44:23,817 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:44:23,817 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:44:23,818 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable177 [2021-11-03 05:44:23,818 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr24ASSERT_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-03 05:44:23,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:44:23,819 INFO L85 PathProgramCache]: Analyzing trace with hash -1330138439, now seen corresponding path program 1 times [2021-11-03 05:44:23,819 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:44:23,819 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1201312622] [2021-11-03 05:44:23,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:44:23,820 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:44:23,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:44:24,101 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:44:24,102 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:44:24,102 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1201312622] [2021-11-03 05:44:24,102 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1201312622] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 05:44:24,102 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:44:24,102 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-03 05:44:24,102 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [251755804] [2021-11-03 05:44:24,103 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-03 05:44:24,103 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:44:24,103 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-03 05:44:24,104 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-03 05:44:24,104 INFO L87 Difference]: Start difference. First operand 249 states and 320 transitions. Second operand has 7 states, 6 states have (on average 3.8333333333333335) internal successors, (23), 6 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) [2021-11-03 05:44:24,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:44:24,753 INFO L93 Difference]: Finished difference Result 286 states and 348 transitions. [2021-11-03 05:44:24,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-03 05:44:24,754 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.8333333333333335) internal successors, (23), 6 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 23 [2021-11-03 05:44:24,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:44:24,756 INFO L225 Difference]: With dead ends: 286 [2021-11-03 05:44:24,757 INFO L226 Difference]: Without dead ends: 286 [2021-11-03 05:44:24,757 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=65, Invalid=117, Unknown=0, NotChecked=0, Total=182 [2021-11-03 05:44:24,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2021-11-03 05:44:24,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 248. [2021-11-03 05:44:24,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 248 states, 228 states have (on average 1.394736842105263) internal successors, (318), 247 states have internal predecessors, (318), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:44:24,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 318 transitions. [2021-11-03 05:44:24,768 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 318 transitions. Word has length 23 [2021-11-03 05:44:24,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:44:24,769 INFO L470 AbstractCegarLoop]: Abstraction has 248 states and 318 transitions. [2021-11-03 05:44:24,769 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.8333333333333335) internal successors, (23), 6 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) [2021-11-03 05:44:24,769 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 318 transitions. [2021-11-03 05:44:24,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-03 05:44:24,771 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:44:24,772 INFO L513 BasicCegarLoop]: trace histogram [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, 1] [2021-11-03 05:44:24,772 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable178 [2021-11-03 05:44:24,772 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr20REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-03 05:44:24,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:44:24,773 INFO L85 PathProgramCache]: Analyzing trace with hash 1411096223, now seen corresponding path program 1 times [2021-11-03 05:44:24,773 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:44:24,774 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1212432337] [2021-11-03 05:44:24,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:44:24,774 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:44:24,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:44:24,974 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:44:24,974 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:44:24,974 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1212432337] [2021-11-03 05:44:24,975 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1212432337] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:44:24,975 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1113645128] [2021-11-03 05:44:24,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:44:24,975 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:44:24,975 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:44:24,977 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:44:25,017 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-03 05:44:25,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:44:25,253 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-03 05:44:25,256 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:44:25,387 INFO L354 Elim1Store]: treesize reduction 240, result has 16.1 percent of original size [2021-11-03 05:44:25,387 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 5 case distinctions, treesize of input 46 treesize of output 75 [2021-11-03 05:44:25,542 INFO L354 Elim1Store]: treesize reduction 365, result has 12.0 percent of original size [2021-11-03 05:44:25,542 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 6 case distinctions, treesize of input 75 treesize of output 105 [2021-11-03 05:44:26,102 INFO L354 Elim1Store]: treesize reduction 32, result has 31.9 percent of original size [2021-11-03 05:44:26,102 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 42 treesize of output 51 [2021-11-03 05:44:26,134 INFO L354 Elim1Store]: treesize reduction 8, result has 68.0 percent of original size [2021-11-03 05:44:26,134 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 48 treesize of output 56 [2021-11-03 05:44:26,487 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:44:26,487 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:44:26,976 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:44:26,977 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1113645128] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:44:26,977 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1518021306] [2021-11-03 05:44:26,980 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-03 05:44:26,981 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:44:26,981 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:44:26,981 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:44:26,982 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:44:27,007 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:27,008 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:44:27,009 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:27,010 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 118 [2021-11-03 05:44:27,010 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:44:27,011 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:27,011 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-03 05:44:27,017 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 507 [2021-11-03 05:44:27,028 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_62|], 78=[|v_#valid_95|]} [2021-11-03 05:44:27,043 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-03 05:44:27,043 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:27,044 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 05:44:27,044 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:27,045 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 05:44:27,045 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:44:27,059 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-03 05:44:27,060 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:27,066 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 05:44:27,067 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:27,067 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 05:44:27,067 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:44:27,086 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,088 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,093 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,096 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,100 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,103 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,106 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,109 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,112 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,114 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,117 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,120 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,123 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,125 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,129 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,170 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 22 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 31 [2021-11-03 05:44:27,170 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:27,171 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-11-03 05:44:27,172 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:27,172 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-11-03 05:44:27,173 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-11-03 05:44:27,186 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-03 05:44:27,187 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:27,188 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 05:44:27,188 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:27,189 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 05:44:27,189 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-11-03 05:44:27,189 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:27,211 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:27,218 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,221 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,222 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,223 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,226 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,228 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,229 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,231 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,232 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,233 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,235 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,236 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,238 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,239 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,240 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,242 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,244 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,257 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,259 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,260 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,262 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,267 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,268 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,272 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,273 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,275 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,276 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,278 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,336 INFO L354 Elim1Store]: treesize reduction 90, result has 15.1 percent of original size [2021-11-03 05:44:27,337 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 18 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 10 case distinctions, treesize of input 71 treesize of output 70 [2021-11-03 05:44:27,338 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:27,343 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:44:27,344 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:27,345 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:44:27,345 INFO L550 ElimStorePlain]: Start of recursive call 6: End of recursive call: and 1 xjuncts. [2021-11-03 05:44:27,346 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:27,386 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:27,395 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:27,403 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 403 [2021-11-03 05:44:27,405 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:44:27,406 INFO L247 ElimStorePlain]: Needed 6 recursive calls to eliminate 2 variables, input treesize:1853, output treesize:403 [2021-11-03 05:44:27,470 INFO L180 QuantifierPusher]: treesize reduction 3, result has 99.4 percent of original size [2021-11-03 05:44:27,483 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 478 [2021-11-03 05:44:27,511 INFO L180 QuantifierPusher]: treesize reduction 18, result has 96.5 percent of original size [2021-11-03 05:44:27,522 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 490 [2021-11-03 05:44:27,554 INFO L180 QuantifierPusher]: treesize reduction 18, result has 96.9 percent of original size [2021-11-03 05:44:27,557 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:44:27,558 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:27,559 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-03 05:44:27,572 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 555 [2021-11-03 05:44:27,609 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,616 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,619 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,621 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,623 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,626 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,631 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,633 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,638 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,639 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,643 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,647 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-03 05:44:27,649 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,652 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,657 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,659 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:44:27,666 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-03 05:44:27,720 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-03 05:44:27,734 INFO L244 Elim1Store]: Index analysis took 125 ms [2021-11-03 05:44:27,767 INFO L354 Elim1Store]: treesize reduction 48, result has 2.0 percent of original size [2021-11-03 05:44:27,767 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 8 select indices, 8 select index equivalence classes, 23 disjoint index pairs (out of 28 index pairs), introduced 6 new quantified variables, introduced 7 case distinctions, treesize of input 73 treesize of output 84 [2021-11-03 05:44:27,769 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:27,772 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 67 [2021-11-03 05:44:27,773 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:27,774 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 67 [2021-11-03 05:44:27,774 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:44:27,798 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-03 05:44:27,799 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:27,799 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 05:44:27,800 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:27,800 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 05:44:27,801 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:44:27,801 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:27,838 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:27,848 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:27,859 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 542 [2021-11-03 05:44:27,860 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:44:27,861 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:1097, output treesize:542 [2021-11-03 05:44:27,905 INFO L180 QuantifierPusher]: treesize reduction 9, result has 98.4 percent of original size [2021-11-03 05:44:27,918 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 542 [2021-11-03 05:44:27,936 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:27,948 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 536 [2021-11-03 05:44:27,969 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:27,987 INFO L185 QuantifierPusher]: treesize reduction 9, result has 98.2 percent of original size 489 [2021-11-03 05:44:28,030 INFO L180 QuantifierPusher]: treesize reduction 12, result has 97.9 percent of original size [2021-11-03 05:44:28,045 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 569 [2021-11-03 05:44:28,058 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:28,073 INFO L185 QuantifierPusher]: treesize reduction 3, result has 99.4 percent of original size 536 [2021-11-03 05:44:28,088 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:28,244 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:28,372 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:28,615 INFO L180 QuantifierPusher]: treesize reduction 15, result has 98.8 percent of original size [2021-11-03 05:44:28,644 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1262 [2021-11-03 05:44:28,674 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:28,725 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1276 [2021-11-03 05:44:28,891 INFO L180 QuantifierPusher]: treesize reduction 15, result has 98.8 percent of original size [2021-11-03 05:44:28,918 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1262 [2021-11-03 05:44:28,970 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:44:29,019 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1276 [2021-11-03 05:44:29,043 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:29,194 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:29,196 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:29,197 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:29,199 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:29,206 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:29,213 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:29,221 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:29,357 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:29,358 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:29,360 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:29,361 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:29,363 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:29,369 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:29,381 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:29,422 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:29,467 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:29,482 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:29,527 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:29,570 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:29,623 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:29,638 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:44:29,711 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:44:44,846 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:44:44,846 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:44:44,846 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 4, 4] total 14 [2021-11-03 05:44:44,847 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1281103740] [2021-11-03 05:44:44,847 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-03 05:44:44,847 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:44:44,848 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-03 05:44:44,849 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=728, Unknown=0, NotChecked=0, Total=930 [2021-11-03 05:44:44,849 INFO L87 Difference]: Start difference. First operand 248 states and 318 transitions. Second operand has 16 states, 15 states have (on average 5.4) internal successors, (81), 15 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:44:46,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:44:46,058 INFO L93 Difference]: Finished difference Result 403 states and 464 transitions. [2021-11-03 05:44:46,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-03 05:44:46,059 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 5.4) internal successors, (81), 15 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2021-11-03 05:44:46,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:44:46,062 INFO L225 Difference]: With dead ends: 403 [2021-11-03 05:44:46,063 INFO L226 Difference]: Without dead ends: 403 [2021-11-03 05:44:46,064 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 47 SyntacticMatches, 10 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 603 ImplicationChecksByTransitivity, 15.8s TimeCoverageRelationStatistics Valid=350, Invalid=1372, Unknown=0, NotChecked=0, Total=1722 [2021-11-03 05:44:46,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 403 states. [2021-11-03 05:44:46,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 403 to 244. [2021-11-03 05:44:46,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 244 states, 230 states have (on average 1.3304347826086957) internal successors, (306), 243 states have internal predecessors, (306), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:44:46,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 306 transitions. [2021-11-03 05:44:46,075 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 306 transitions. Word has length 27 [2021-11-03 05:44:46,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:44:46,075 INFO L470 AbstractCegarLoop]: Abstraction has 244 states and 306 transitions. [2021-11-03 05:44:46,076 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 5.4) internal successors, (81), 15 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:44:46,076 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 306 transitions. [2021-11-03 05:44:46,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-03 05:44:46,077 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:44:46,077 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-03 05:44:46,129 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-03 05:44:46,294 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable179 [2021-11-03 05:44:46,295 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr22ASSERT_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-03 05:44:46,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:44:46,295 INFO L85 PathProgramCache]: Analyzing trace with hash -1146193890, now seen corresponding path program 1 times [2021-11-03 05:44:46,295 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 05:44:46,295 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [205499180] [2021-11-03 05:44:46,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:44:46,296 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 05:44:46,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:44:46,836 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:44:46,836 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 05:44:46,836 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [205499180] [2021-11-03 05:44:46,837 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [205499180] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 05:44:46,837 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1399732341] [2021-11-03 05:44:46,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:44:46,837 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:44:46,837 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:44:46,838 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:44:46,839 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-03 05:44:47,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:44:47,168 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-03 05:44:47,171 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:44:47,476 INFO L354 Elim1Store]: treesize reduction 521, result has 10.6 percent of original size [2021-11-03 05:44:47,476 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 11 case distinctions, treesize of input 256 treesize of output 286 [2021-11-03 05:44:47,587 INFO L354 Elim1Store]: treesize reduction 380, result has 7.8 percent of original size [2021-11-03 05:44:47,588 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 5 case distinctions, treesize of input 286 treesize of output 295 [2021-11-03 05:45:09,345 INFO L354 Elim1Store]: treesize reduction 194, result has 27.3 percent of original size [2021-11-03 05:45:09,346 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 161 treesize of output 211 [2021-11-03 05:45:09,487 INFO L354 Elim1Store]: treesize reduction 252, result has 12.8 percent of original size [2021-11-03 05:45:09,488 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 21 case distinctions, treesize of input 190 treesize of output 207 [2021-11-03 05:45:12,831 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 116 treesize of output 92 [2021-11-03 05:45:12,838 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 89 treesize of output 77 [2021-11-03 05:45:13,124 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:45:13,125 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:45:13,734 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:45:13,735 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1399732341] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:45:13,735 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [400020053] [2021-11-03 05:45:13,738 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-03 05:45:13,738 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 05:45:13,739 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 05:45:13,739 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 05:45:13,739 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 05:45:13,764 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:45:13,765 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:45:13,766 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:45:13,767 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-03 05:45:13,768 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:45:13,768 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:45:13,769 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 118 [2021-11-03 05:45:13,773 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 507 [2021-11-03 05:45:13,781 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_67|], 78=[|v_#valid_100|]} [2021-11-03 05:45:13,793 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-03 05:45:13,794 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:45:13,794 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 05:45:13,797 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:45:13,798 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 05:45:13,798 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:45:13,812 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-03 05:45:13,813 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:45:13,814 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 05:45:13,814 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:45:13,814 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 05:45:13,814 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:45:13,827 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-03 05:45:13,828 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:45:13,828 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 05:45:13,830 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:45:13,830 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 05:45:13,830 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-11-03 05:45:13,845 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:13,847 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:13,850 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:13,852 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:13,854 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:13,856 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:13,858 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:13,860 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:13,863 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:13,865 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:13,866 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:13,868 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:13,870 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:13,872 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:13,874 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:13,875 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 22 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 31 [2021-11-03 05:45:13,876 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:45:13,876 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-11-03 05:45:13,877 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:45:13,878 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-11-03 05:45:13,878 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-11-03 05:45:13,879 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:45:13,891 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:45:13,898 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:13,900 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:13,903 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:13,905 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:13,906 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:13,907 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:13,908 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:13,909 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:13,911 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:13,912 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:13,913 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:13,914 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:13,915 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:13,916 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:13,917 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:13,918 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:13,920 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:13,930 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:13,931 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:13,932 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:13,933 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:13,937 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:13,938 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:13,940 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:13,941 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:13,942 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:13,943 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:13,944 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:14,032 INFO L354 Elim1Store]: treesize reduction 90, result has 15.1 percent of original size [2021-11-03 05:45:14,033 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 18 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 10 case distinctions, treesize of input 71 treesize of output 70 [2021-11-03 05:45:14,034 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:45:14,039 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:45:14,040 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:45:14,041 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-03 05:45:14,041 INFO L550 ElimStorePlain]: Start of recursive call 6: End of recursive call: and 1 xjuncts. [2021-11-03 05:45:14,042 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:45:14,065 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:45:14,072 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:45:14,085 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 403 [2021-11-03 05:45:14,086 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:45:14,086 INFO L247 ElimStorePlain]: Needed 6 recursive calls to eliminate 2 variables, input treesize:1853, output treesize:403 [2021-11-03 05:45:14,144 INFO L180 QuantifierPusher]: treesize reduction 3, result has 99.4 percent of original size [2021-11-03 05:45:14,154 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 478 [2021-11-03 05:45:14,181 INFO L180 QuantifierPusher]: treesize reduction 18, result has 96.5 percent of original size [2021-11-03 05:45:14,191 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 490 [2021-11-03 05:45:14,219 INFO L180 QuantifierPusher]: treesize reduction 18, result has 96.9 percent of original size [2021-11-03 05:45:14,221 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:45:14,222 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:45:14,223 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-03 05:45:14,233 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 555 [2021-11-03 05:45:14,268 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:14,274 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:14,276 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:14,279 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:14,281 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:14,285 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:14,290 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:14,292 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:14,296 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:14,298 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:14,300 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:14,305 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:14,306 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-03 05:45:14,308 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:14,313 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:14,316 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 05:45:14,320 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-03 05:45:14,358 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-03 05:45:14,388 INFO L354 Elim1Store]: treesize reduction 48, result has 2.0 percent of original size [2021-11-03 05:45:14,389 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 8 select indices, 8 select index equivalence classes, 25 disjoint index pairs (out of 28 index pairs), introduced 6 new quantified variables, introduced 7 case distinctions, treesize of input 73 treesize of output 84 [2021-11-03 05:45:14,389 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:45:14,400 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-03 05:45:14,401 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:45:14,401 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-03 05:45:14,402 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 05:45:14,421 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-03 05:45:14,422 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:45:14,422 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 05:45:14,423 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:45:14,426 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 05:45:14,426 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 05:45:14,427 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:45:14,450 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:45:14,455 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:45:14,461 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 543 [2021-11-03 05:45:14,462 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 05:45:14,462 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:1097, output treesize:543 [2021-11-03 05:45:14,504 INFO L180 QuantifierPusher]: treesize reduction 9, result has 98.4 percent of original size [2021-11-03 05:45:14,516 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 543 [2021-11-03 05:45:14,536 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:45:14,546 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 537 [2021-11-03 05:45:14,559 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:45:14,567 INFO L185 QuantifierPusher]: treesize reduction 9, result has 98.2 percent of original size 491 [2021-11-03 05:45:14,597 INFO L180 QuantifierPusher]: treesize reduction 12, result has 97.9 percent of original size [2021-11-03 05:45:14,609 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 571 [2021-11-03 05:45:14,617 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:45:14,624 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 578 [2021-11-03 05:45:14,635 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:45:14,703 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:45:14,795 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:45:14,970 INFO L180 QuantifierPusher]: treesize reduction 27, result has 97.9 percent of original size [2021-11-03 05:45:14,971 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:45:14,983 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:45:14,997 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1165 [2021-11-03 05:45:15,043 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1289 [2021-11-03 05:45:15,060 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:45:15,110 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1303 [2021-11-03 05:45:15,231 INFO L180 QuantifierPusher]: treesize reduction 27, result has 97.9 percent of original size [2021-11-03 05:45:15,232 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 05:45:15,257 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:45:15,271 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1165 [2021-11-03 05:45:15,300 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1289 [2021-11-03 05:45:15,331 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 05:45:15,358 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1303 [2021-11-03 05:45:15,375 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:45:15,476 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:45:15,477 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:45:15,479 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:45:15,480 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:45:15,485 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:45:15,491 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:45:15,500 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:45:15,615 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:45:15,617 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:45:15,618 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:45:15,619 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:45:15,622 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:45:15,626 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:45:15,641 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:45:15,681 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:45:15,724 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:45:15,735 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:45:15,785 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:45:15,819 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:45:15,856 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:45:15,867 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 05:45:15,920 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 05:45:40,967 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 05:45:40,968 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 05:45:40,968 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 16 [2021-11-03 05:45:40,968 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1527070416] [2021-11-03 05:45:40,969 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-03 05:45:40,969 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 05:45:40,969 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-03 05:45:40,970 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=842, Unknown=0, NotChecked=0, Total=1056 [2021-11-03 05:45:40,971 INFO L87 Difference]: Start difference. First operand 244 states and 306 transitions. Second operand has 18 states, 17 states have (on average 5.117647058823529) internal successors, (87), 17 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) [2021-11-03 05:46:25,577 WARN L228 Executor]: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) stderr output: (error "out of memory") [2021-11-03 05:46:25,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-03 05:46:25,582 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 101 [2021-11-03 05:46:25,609 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-03 05:46:25,782 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable208,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:46:25,783 FATAL L? ?]: An unrecoverable error occured during an interaction with an SMT solver: de.uni_freiburg.informatik.ultimate.logic.SMTLIBException: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) Received EOF on stdin. stderr output: (error "out of memory") at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.parse(Executor.java:241) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.parseCheckSatResult(Executor.java:260) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Scriptor.checkSat(Scriptor.java:155) at de.uni_freiburg.informatik.ultimate.logic.WrapperScript.checkSat(WrapperScript.java:163) at de.uni_freiburg.informatik.ultimate.logic.WrapperScript.checkSat(WrapperScript.java:163) at de.uni_freiburg.informatik.ultimate.logic.WrapperScript.checkSat(WrapperScript.java:163) at de.uni_freiburg.informatik.ultimate.logic.Util.checkSat(Util.java:61) at de.uni_freiburg.informatik.ultimate.logic.simplification.SimplifyDDA.getRedundancy(SimplifyDDA.java:621) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.simplify.SimplifyDDAWithTimeout.getRedundancy(SimplifyDDAWithTimeout.java:120) at de.uni_freiburg.informatik.ultimate.logic.simplification.SimplifyDDA$Simplifier.walk(SimplifyDDA.java:371) at de.uni_freiburg.informatik.ultimate.logic.NonRecursive.run(NonRecursive.java:115) at de.uni_freiburg.informatik.ultimate.logic.NonRecursive.run(NonRecursive.java:106) at de.uni_freiburg.informatik.ultimate.logic.simplification.SimplifyDDA.simplifyOnce(SimplifyDDA.java:650) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.simplify.SimplifyDDAWithTimeout.getSimplifiedTerm(SimplifyDDAWithTimeout.java:180) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.SmtUtils.simplify(SmtUtils.java:174) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.SmtUtils.simplify(SmtUtils.java:140) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate(PredicateUnifier.java:360) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicateForConjunction(PredicateUnifier.java:388) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicateForConjunction(PredicateUnifier.java:229) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.DeterministicInterpolantAutomaton.getOrConstructPredicate(DeterministicInterpolantAutomaton.java:282) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.DeterministicInterpolantAutomaton.constructSuccessorsAndTransitions(DeterministicInterpolantAutomaton.java:304) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.BasicAbstractInterpolantAutomaton.computeSuccs(BasicAbstractInterpolantAutomaton.java:79) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.BasicAbstractInterpolantAutomaton.computeSuccs(BasicAbstractInterpolantAutomaton.java:1) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.AbstractInterpolantAutomaton.internalSuccessors(AbstractInterpolantAutomaton.java:233) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.AbstractInterpolantAutomaton.internalSuccessors(AbstractInterpolantAutomaton.java:1) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.TotalizeNwa.internalSuccessors(TotalizeNwa.java:213) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.ComplementDeterministicNwa.internalSuccessors(ComplementDeterministicNwa.java:121) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.ProductNwa.internalSuccessors(ProductNwa.java:216) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.ProductNwa.internalSuccessors(ProductNwa.java:208) at de.uni_freiburg.informatik.ultimate.automata.nestedword.reachablestates.NestedWordAutomatonReachableStates$ReachableStatesComputation.addInternalsAndSuccessors(NestedWordAutomatonReachableStates.java:1058) at de.uni_freiburg.informatik.ultimate.automata.nestedword.reachablestates.NestedWordAutomatonReachableStates$ReachableStatesComputation.(NestedWordAutomatonReachableStates.java:960) at de.uni_freiburg.informatik.ultimate.automata.nestedword.reachablestates.NestedWordAutomatonReachableStates.(NestedWordAutomatonReachableStates.java:182) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.Difference.computeDifference(Difference.java:137) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.Difference.(Difference.java:90) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.computeAutomataDifference(BasicCegarLoop.java:869) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.refineAbstraction(BasicCegarLoop.java:783) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.refineAbstractionInternal(AbstractCegarLoop.java:462) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:420) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) Caused by: de.uni_freiburg.informatik.ultimate.logic.SMTLIBException: EOF at de.uni_freiburg.informatik.ultimate.smtsolver.external.Parser$Action$.CUP$do_action(Parser.java:1465) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Parser.do_action(Parser.java:658) at com.github.jhoenicke.javacup.runtime.LRParser.parse(LRParser.java:383) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.parse(Executor.java:237) ... 56 more [2021-11-03 05:46:25,787 INFO L168 Benchmark]: Toolchain (without parser) took 170036.72 ms. Allocated memory was 117.4 MB in the beginning and 318.8 MB in the end (delta: 201.3 MB). Free memory was 73.8 MB in the beginning and 160.8 MB in the end (delta: -87.0 MB). Peak memory consumption was 113.5 MB. Max. memory is 16.1 GB. [2021-11-03 05:46:25,787 INFO L168 Benchmark]: CDTParser took 0.33 ms. Allocated memory is still 117.4 MB. Free memory is still 91.4 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-11-03 05:46:25,787 INFO L168 Benchmark]: CACSL2BoogieTranslator took 809.69 ms. Allocated memory is still 117.4 MB. Free memory was 73.7 MB in the beginning and 80.8 MB in the end (delta: -7.1 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2021-11-03 05:46:25,787 INFO L168 Benchmark]: Boogie Procedure Inliner took 73.34 ms. Allocated memory is still 117.4 MB. Free memory was 80.8 MB in the beginning and 78.3 MB in the end (delta: 2.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-11-03 05:46:25,788 INFO L168 Benchmark]: Boogie Preprocessor took 52.12 ms. Allocated memory is still 117.4 MB. Free memory was 78.3 MB in the beginning and 76.2 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-11-03 05:46:25,788 INFO L168 Benchmark]: RCFGBuilder took 974.66 ms. Allocated memory is still 117.4 MB. Free memory was 76.2 MB in the beginning and 51.0 MB in the end (delta: 25.2 MB). Peak memory consumption was 25.2 MB. Max. memory is 16.1 GB. [2021-11-03 05:46:25,788 INFO L168 Benchmark]: TraceAbstraction took 168119.81 ms. Allocated memory was 117.4 MB in the beginning and 318.8 MB in the end (delta: 201.3 MB). Free memory was 50.7 MB in the beginning and 160.8 MB in the end (delta: -110.1 MB). Peak memory consumption was 94.4 MB. Max. memory is 16.1 GB. [2021-11-03 05:46:25,790 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.33 ms. Allocated memory is still 117.4 MB. Free memory is still 91.4 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 809.69 ms. Allocated memory is still 117.4 MB. Free memory was 73.7 MB in the beginning and 80.8 MB in the end (delta: -7.1 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 73.34 ms. Allocated memory is still 117.4 MB. Free memory was 80.8 MB in the beginning and 78.3 MB in the end (delta: 2.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 52.12 ms. Allocated memory is still 117.4 MB. Free memory was 78.3 MB in the beginning and 76.2 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 974.66 ms. Allocated memory is still 117.4 MB. Free memory was 76.2 MB in the beginning and 51.0 MB in the end (delta: 25.2 MB). Peak memory consumption was 25.2 MB. Max. memory is 16.1 GB. * TraceAbstraction took 168119.81 ms. Allocated memory was 117.4 MB in the beginning and 318.8 MB in the end (delta: 201.3 MB). Free memory was 50.7 MB in the beginning and 160.8 MB in the end (delta: -110.1 MB). Peak memory consumption was 94.4 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: SMTLIBException: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) Received EOF on stdin. stderr output: (error "out of memory") de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMTLIBException: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) Received EOF on stdin. stderr output: (error "out of memory") : de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.parse(Executor.java:241) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/memsafety-bftpd/bftpd_2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/config/svcomp-MemCleanup-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-memcleanup) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 7c883b81b24ce5a721aa9a1ff13aef8a0d532ba87d9e130e470a0b88a1f8e93e --- Real Ultimate output --- This is Ultimate 0.2.1-dev-9ad7fb2 [2021-11-03 05:46:28,357 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-03 05:46:28,360 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-03 05:46:28,400 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-03 05:46:28,401 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-03 05:46:28,403 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-03 05:46:28,405 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-03 05:46:28,409 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-03 05:46:28,412 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-03 05:46:28,413 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-03 05:46:28,415 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-03 05:46:28,416 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-03 05:46:28,417 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-03 05:46:28,419 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-03 05:46:28,421 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-03 05:46:28,423 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-03 05:46:28,424 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-03 05:46:28,425 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-03 05:46:28,428 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-03 05:46:28,432 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-03 05:46:28,435 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-03 05:46:28,437 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-03 05:46:28,439 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-03 05:46:28,440 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-03 05:46:28,445 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-03 05:46:28,446 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-03 05:46:28,447 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-03 05:46:28,448 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-03 05:46:28,449 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-03 05:46:28,450 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-03 05:46:28,451 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-03 05:46:28,452 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-03 05:46:28,453 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-03 05:46:28,454 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-03 05:46:28,456 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-03 05:46:28,456 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-03 05:46:28,457 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-03 05:46:28,458 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-03 05:46:28,458 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-03 05:46:28,460 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-03 05:46:28,461 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-03 05:46:28,462 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/config/svcomp-MemCleanup-32bit-Taipan_Bitvector.epf [2021-11-03 05:46:28,498 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-03 05:46:28,506 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-03 05:46:28,507 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-03 05:46:28,507 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-03 05:46:28,508 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-03 05:46:28,508 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-03 05:46:28,508 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-03 05:46:28,509 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-03 05:46:28,509 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-03 05:46:28,510 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-03 05:46:28,511 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-03 05:46:28,511 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-03 05:46:28,511 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-03 05:46:28,512 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-03 05:46:28,514 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-03 05:46:28,514 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-03 05:46:28,514 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-03 05:46:28,515 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-03 05:46:28,515 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-03 05:46:28,515 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-03 05:46:28,518 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-03 05:46:28,519 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-03 05:46:28,519 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-03 05:46:28,519 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-03 05:46:28,520 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-03 05:46:28,520 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-03 05:46:28,520 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-03 05:46:28,521 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-03 05:46:28,521 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-03 05:46:28,521 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-03 05:46:28,522 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-03 05:46:28,523 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-03 05:46:28,523 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-03 05:46:28,523 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-03 05:46:28,524 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-03 05:46:28,524 INFO L138 SettingsManager]: * Logic for external solver=AUFBV 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_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-memcleanup) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 7c883b81b24ce5a721aa9a1ff13aef8a0d532ba87d9e130e470a0b88a1f8e93e [2021-11-03 05:46:28,951 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-03 05:46:28,982 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-03 05:46:28,988 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-03 05:46:28,989 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-03 05:46:28,990 INFO L275 PluginConnector]: CDTParser initialized [2021-11-03 05:46:28,992 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/../../sv-benchmarks/c/memsafety-bftpd/bftpd_2.i [2021-11-03 05:46:29,092 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/data/767dad8b7/475dbffc1f6b4ffda6fd19da7eda4f5e/FLAG16a162025 [2021-11-03 05:46:29,810 INFO L306 CDTParser]: Found 1 translation units. [2021-11-03 05:46:29,811 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/sv-benchmarks/c/memsafety-bftpd/bftpd_2.i [2021-11-03 05:46:29,840 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/data/767dad8b7/475dbffc1f6b4ffda6fd19da7eda4f5e/FLAG16a162025 [2021-11-03 05:46:30,048 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/data/767dad8b7/475dbffc1f6b4ffda6fd19da7eda4f5e [2021-11-03 05:46:30,053 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-03 05:46:30,063 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-03 05:46:30,065 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-03 05:46:30,065 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-03 05:46:30,069 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-03 05:46:30,073 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 05:46:30" (1/1) ... [2021-11-03 05:46:30,075 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7ca9f6a9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:46:30, skipping insertion in model container [2021-11-03 05:46:30,077 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 05:46:30" (1/1) ... [2021-11-03 05:46:30,086 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-03 05:46:30,155 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-03 05:46:30,654 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-03 05:46:30,668 INFO L203 MainTranslator]: Completed pre-run [2021-11-03 05:46:30,768 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-03 05:46:30,838 INFO L208 MainTranslator]: Completed translation [2021-11-03 05:46:30,839 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:46:30 WrapperNode [2021-11-03 05:46:30,839 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-03 05:46:30,841 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-03 05:46:30,841 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-03 05:46:30,841 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-03 05:46:30,850 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:46:30" (1/1) ... [2021-11-03 05:46:30,876 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:46:30" (1/1) ... [2021-11-03 05:46:30,941 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-03 05:46:30,943 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-03 05:46:30,943 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-03 05:46:30,943 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-03 05:46:30,954 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:46:30" (1/1) ... [2021-11-03 05:46:30,954 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:46:30" (1/1) ... [2021-11-03 05:46:30,974 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:46:30" (1/1) ... [2021-11-03 05:46:30,976 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:46:30" (1/1) ... [2021-11-03 05:46:31,008 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:46:30" (1/1) ... [2021-11-03 05:46:31,028 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:46:30" (1/1) ... [2021-11-03 05:46:31,031 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:46:30" (1/1) ... [2021-11-03 05:46:31,037 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-03 05:46:31,052 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-03 05:46:31,052 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-03 05:46:31,052 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-03 05:46:31,053 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:46:30" (1/1) ... [2021-11-03 05:46:31,062 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-03 05:46:31,080 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:46:31,095 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-03 05:46:31,123 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-03 05:46:31,178 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE1 [2021-11-03 05:46:31,179 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-03 05:46:31,179 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-03 05:46:31,179 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-03 05:46:31,179 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-03 05:46:31,180 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-11-03 05:46:31,180 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-03 05:46:31,180 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-03 05:46:31,180 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-03 05:46:32,460 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-03 05:46:32,460 INFO L299 CfgBuilder]: Removed 31 assume(true) statements. [2021-11-03 05:46:32,463 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 05:46:32 BoogieIcfgContainer [2021-11-03 05:46:32,463 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-03 05:46:32,465 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-03 05:46:32,466 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-03 05:46:32,470 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-03 05:46:32,470 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.11 05:46:30" (1/3) ... [2021-11-03 05:46:32,471 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2d88d4e1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 05:46:32, skipping insertion in model container [2021-11-03 05:46:32,471 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 05:46:30" (2/3) ... [2021-11-03 05:46:32,472 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2d88d4e1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 05:46:32, skipping insertion in model container [2021-11-03 05:46:32,472 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 05:46:32" (3/3) ... [2021-11-03 05:46:32,474 INFO L111 eAbstractionObserver]: Analyzing ICFG bftpd_2.i [2021-11-03 05:46:32,482 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-03 05:46:32,482 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 58 error locations. [2021-11-03 05:46:32,558 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-03 05:46:32,571 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 [2021-11-03 05:46:32,572 INFO L340 AbstractCegarLoop]: Starting to check reachability of 58 error locations. [2021-11-03 05:46:32,602 INFO L276 IsEmpty]: Start isEmpty. Operand has 147 states, 88 states have (on average 1.9318181818181819) internal successors, (170), 146 states have internal predecessors, (170), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:46:32,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-03 05:46:32,623 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:46:32,624 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-03 05:46:32,625 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-03 05:46:32,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:46:32,633 INFO L85 PathProgramCache]: Analyzing trace with hash 925765, now seen corresponding path program 1 times [2021-11-03 05:46:32,651 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-03 05:46:32,652 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1192222215] [2021-11-03 05:46:32,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:46:32,653 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-03 05:46:32,654 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat [2021-11-03 05:46:32,658 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-03 05:46:32,697 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-03 05:46:32,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:46:32,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-03 05:46:32,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:46:33,315 INFO L354 Elim1Store]: treesize reduction 351, result has 15.4 percent of original size [2021-11-03 05:46:33,318 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 6 case distinctions, treesize of input 24 treesize of output 69 [2021-11-03 05:46:34,512 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:46:34,512 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:46:34,536 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:46:34,537 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-03 05:46:34,537 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1192222215] [2021-11-03 05:46:34,538 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1192222215] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-03 05:46:34,539 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:46:34,539 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1, 1] imperfect sequences [] total 1 [2021-11-03 05:46:34,543 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2090402418] [2021-11-03 05:46:34,549 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-03 05:46:34,550 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-03 05:46:34,569 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-03 05:46:34,570 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 05:46:34,576 INFO L87 Difference]: Start difference. First operand has 147 states, 88 states have (on average 1.9318181818181819) internal successors, (170), 146 states have internal predecessors, (170), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:46:34,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:46:34,974 INFO L93 Difference]: Finished difference Result 159 states and 180 transitions. [2021-11-03 05:46:34,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-03 05:46:34,976 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2021-11-03 05:46:34,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:46:34,991 INFO L225 Difference]: With dead ends: 159 [2021-11-03 05:46:34,991 INFO L226 Difference]: Without dead ends: 155 [2021-11-03 05:46:34,994 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 05:46:35,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-11-03 05:46:35,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 148. [2021-11-03 05:46:35,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 97 states have (on average 1.7731958762886597) internal successors, (172), 147 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:46:35,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 172 transitions. [2021-11-03 05:46:35,060 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 172 transitions. Word has length 4 [2021-11-03 05:46:35,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:46:35,061 INFO L470 AbstractCegarLoop]: Abstraction has 148 states and 172 transitions. [2021-11-03 05:46:35,061 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:46:35,062 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 172 transitions. [2021-11-03 05:46:35,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-03 05:46:35,062 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:46:35,063 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-03 05:46:35,082 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (2)] Ended with exit code 0 [2021-11-03 05:46:35,282 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 [2021-11-03 05:46:35,282 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-03 05:46:35,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:46:35,287 INFO L85 PathProgramCache]: Analyzing trace with hash 925766, now seen corresponding path program 1 times [2021-11-03 05:46:35,288 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-03 05:46:35,288 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1283709158] [2021-11-03 05:46:35,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:46:35,289 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-03 05:46:35,289 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat [2021-11-03 05:46:35,291 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-03 05:46:35,301 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-03 05:46:35,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:46:35,395 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-03 05:46:35,396 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:46:35,685 INFO L354 Elim1Store]: treesize reduction 240, result has 16.1 percent of original size [2021-11-03 05:46:35,685 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 5 case distinctions, treesize of input 21 treesize of output 51 [2021-11-03 05:46:35,791 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:46:35,791 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:46:36,054 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:46:36,054 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-03 05:46:36,054 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1283709158] [2021-11-03 05:46:36,055 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1283709158] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-03 05:46:36,055 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:46:36,055 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 4 [2021-11-03 05:46:36,055 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [647252173] [2021-11-03 05:46:36,057 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-03 05:46:36,057 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-03 05:46:36,058 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-03 05:46:36,059 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-03 05:46:36,059 INFO L87 Difference]: Start difference. First operand 148 states and 172 transitions. Second operand has 6 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:46:37,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:46:37,123 INFO L93 Difference]: Finished difference Result 353 states and 398 transitions. [2021-11-03 05:46:37,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-03 05:46:37,125 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2021-11-03 05:46:37,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:46:37,129 INFO L225 Difference]: With dead ends: 353 [2021-11-03 05:46:37,129 INFO L226 Difference]: Without dead ends: 353 [2021-11-03 05:46:37,131 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2021-11-03 05:46:37,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2021-11-03 05:46:37,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 219. [2021-11-03 05:46:37,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 219 states, 168 states have (on average 1.6904761904761905) internal successors, (284), 218 states have internal predecessors, (284), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:46:37,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 284 transitions. [2021-11-03 05:46:37,155 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 284 transitions. Word has length 4 [2021-11-03 05:46:37,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:46:37,156 INFO L470 AbstractCegarLoop]: Abstraction has 219 states and 284 transitions. [2021-11-03 05:46:37,156 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:46:37,157 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 284 transitions. [2021-11-03 05:46:37,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-03 05:46:37,157 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:46:37,157 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-03 05:46:37,177 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-03 05:46:37,371 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 [2021-11-03 05:46:37,371 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-03 05:46:37,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:46:37,372 INFO L85 PathProgramCache]: Analyzing trace with hash 28698698, now seen corresponding path program 1 times [2021-11-03 05:46:37,373 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-03 05:46:37,373 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [257093088] [2021-11-03 05:46:37,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:46:37,374 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-03 05:46:37,374 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat [2021-11-03 05:46:37,375 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-03 05:46:37,380 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-03 05:46:37,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:46:37,514 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-03 05:46:37,516 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:46:37,881 INFO L354 Elim1Store]: treesize reduction 479, result has 13.1 percent of original size [2021-11-03 05:46:37,882 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 12 case distinctions, treesize of input 300 treesize of output 342 [2021-11-03 05:46:37,950 INFO L354 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2021-11-03 05:46:37,951 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 342 treesize of output 338 [2021-11-03 05:46:45,735 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 133 treesize of output 105 [2021-11-03 05:46:47,911 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:46:47,911 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:46:48,039 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:46:48,040 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-03 05:46:48,040 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [257093088] [2021-11-03 05:46:48,041 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [257093088] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-03 05:46:48,041 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:46:48,041 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 6 [2021-11-03 05:46:48,042 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1251828710] [2021-11-03 05:46:48,042 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-03 05:46:48,042 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-03 05:46:48,043 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-03 05:46:48,044 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-03 05:46:48,044 INFO L87 Difference]: Start difference. First operand 219 states and 284 transitions. Second operand has 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:46:54,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:46:54,022 INFO L93 Difference]: Finished difference Result 449 states and 570 transitions. [2021-11-03 05:46:54,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-03 05:46:54,023 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2021-11-03 05:46:54,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:46:54,029 INFO L225 Difference]: With dead ends: 449 [2021-11-03 05:46:54,029 INFO L226 Difference]: Without dead ends: 449 [2021-11-03 05:46:54,030 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=39, Invalid=71, Unknown=0, NotChecked=0, Total=110 [2021-11-03 05:46:54,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 449 states. [2021-11-03 05:46:54,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 449 to 274. [2021-11-03 05:46:54,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 274 states, 223 states have (on average 1.6681614349775784) internal successors, (372), 273 states have internal predecessors, (372), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:46:54,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 274 states to 274 states and 372 transitions. [2021-11-03 05:46:54,059 INFO L78 Accepts]: Start accepts. Automaton has 274 states and 372 transitions. Word has length 5 [2021-11-03 05:46:54,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:46:54,060 INFO L470 AbstractCegarLoop]: Abstraction has 274 states and 372 transitions. [2021-11-03 05:46:54,060 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:46:54,060 INFO L276 IsEmpty]: Start isEmpty. Operand 274 states and 372 transitions. [2021-11-03 05:46:54,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-03 05:46:54,061 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:46:54,061 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-03 05:46:54,081 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-03 05:46:54,275 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 [2021-11-03 05:46:54,276 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr3ASSERT_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-03 05:46:54,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:46:54,277 INFO L85 PathProgramCache]: Analyzing trace with hash 889659685, now seen corresponding path program 1 times [2021-11-03 05:46:54,277 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-03 05:46:54,277 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [796871000] [2021-11-03 05:46:54,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:46:54,278 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-03 05:46:54,278 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat [2021-11-03 05:46:54,281 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-03 05:46:54,286 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-03 05:46:54,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:46:54,480 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-03 05:46:54,482 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:46:54,827 INFO L354 Elim1Store]: treesize reduction 336, result has 13.8 percent of original size [2021-11-03 05:46:54,828 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 5 case distinctions, treesize of input 111 treesize of output 144 [2021-11-03 05:46:54,843 INFO L354 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2021-11-03 05:46:54,844 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 254 treesize of output 246 [2021-11-03 05:46:54,853 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-03 05:46:54,873 INFO L354 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2021-11-03 05:46:54,874 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 246 treesize of output 236 [2021-11-03 05:46:59,061 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 107 treesize of output 83 [2021-11-03 05:46:59,072 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 80 treesize of output 72 [2021-11-03 05:47:03,455 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:47:03,455 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:47:03,589 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:47:03,590 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-03 05:47:03,590 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [796871000] [2021-11-03 05:47:03,590 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [796871000] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-03 05:47:03,590 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:47:03,590 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 6 [2021-11-03 05:47:03,590 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [318806377] [2021-11-03 05:47:03,591 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-03 05:47:03,591 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-03 05:47:03,592 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-03 05:47:03,592 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-03 05:47:03,593 INFO L87 Difference]: Start difference. First operand 274 states and 372 transitions. Second operand has 8 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 7 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) [2021-11-03 05:47:06,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:47:06,481 INFO L93 Difference]: Finished difference Result 586 states and 704 transitions. [2021-11-03 05:47:06,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-03 05:47:06,484 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 7 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 6 [2021-11-03 05:47:06,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:47:06,488 INFO L225 Difference]: With dead ends: 586 [2021-11-03 05:47:06,489 INFO L226 Difference]: Without dead ends: 586 [2021-11-03 05:47:06,489 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2021-11-03 05:47:06,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 586 states. [2021-11-03 05:47:06,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 586 to 302. [2021-11-03 05:47:06,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 302 states, 251 states have (on average 1.6374501992031874) internal successors, (411), 301 states have internal predecessors, (411), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:47:06,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 302 states to 302 states and 411 transitions. [2021-11-03 05:47:06,514 INFO L78 Accepts]: Start accepts. Automaton has 302 states and 411 transitions. Word has length 6 [2021-11-03 05:47:06,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:47:06,514 INFO L470 AbstractCegarLoop]: Abstraction has 302 states and 411 transitions. [2021-11-03 05:47:06,515 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 7 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) [2021-11-03 05:47:06,515 INFO L276 IsEmpty]: Start isEmpty. Operand 302 states and 411 transitions. [2021-11-03 05:47:06,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-03 05:47:06,516 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:47:06,516 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:47:06,531 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-03 05:47:06,730 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 [2021-11-03 05:47:06,731 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-03 05:47:06,731 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:47:06,732 INFO L85 PathProgramCache]: Analyzing trace with hash 1809646508, now seen corresponding path program 1 times [2021-11-03 05:47:06,732 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-03 05:47:06,732 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1153118856] [2021-11-03 05:47:06,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:47:06,733 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-03 05:47:06,733 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat [2021-11-03 05:47:06,734 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-03 05:47:06,740 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-03 05:47:06,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:47:06,919 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-03 05:47:06,920 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:47:07,190 INFO L354 Elim1Store]: treesize reduction 351, result has 15.4 percent of original size [2021-11-03 05:47:07,191 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 7 case distinctions, treesize of input 82 treesize of output 124 [2021-11-03 05:47:07,220 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-03 05:47:07,220 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 124 treesize of output 120 [2021-11-03 05:47:15,278 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:47:15,278 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:47:15,343 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:47:15,343 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-03 05:47:15,344 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1153118856] [2021-11-03 05:47:15,344 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1153118856] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-03 05:47:15,344 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:47:15,344 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 4 [2021-11-03 05:47:15,344 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1579853547] [2021-11-03 05:47:15,345 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-03 05:47:15,345 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-03 05:47:15,346 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-03 05:47:15,346 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-03 05:47:15,346 INFO L87 Difference]: Start difference. First operand 302 states and 411 transitions. Second operand has 6 states, 5 states have (on average 2.8) internal successors, (14), 5 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) [2021-11-03 05:47:17,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:47:17,308 INFO L93 Difference]: Finished difference Result 405 states and 516 transitions. [2021-11-03 05:47:17,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-03 05:47:17,308 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.8) internal successors, (14), 5 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 7 [2021-11-03 05:47:17,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:47:17,312 INFO L225 Difference]: With dead ends: 405 [2021-11-03 05:47:17,312 INFO L226 Difference]: Without dead ends: 405 [2021-11-03 05:47:17,313 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-03 05:47:17,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 405 states. [2021-11-03 05:47:17,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 405 to 308. [2021-11-03 05:47:17,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 308 states, 258 states have (on average 1.62015503875969) internal successors, (418), 307 states have internal predecessors, (418), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:47:17,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 308 states to 308 states and 418 transitions. [2021-11-03 05:47:17,328 INFO L78 Accepts]: Start accepts. Automaton has 308 states and 418 transitions. Word has length 7 [2021-11-03 05:47:17,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:47:17,329 INFO L470 AbstractCegarLoop]: Abstraction has 308 states and 418 transitions. [2021-11-03 05:47:17,329 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.8) internal successors, (14), 5 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) [2021-11-03 05:47:17,329 INFO L276 IsEmpty]: Start isEmpty. Operand 308 states and 418 transitions. [2021-11-03 05:47:17,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-03 05:47:17,330 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:47:17,330 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:47:17,347 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-03 05:47:17,541 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 [2021-11-03 05:47:17,542 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr5ASSERT_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-03 05:47:17,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:47:17,543 INFO L85 PathProgramCache]: Analyzing trace with hash 264466951, now seen corresponding path program 1 times [2021-11-03 05:47:17,545 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-03 05:47:17,545 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1234228031] [2021-11-03 05:47:17,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:47:17,546 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-03 05:47:17,546 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat [2021-11-03 05:47:17,547 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-03 05:47:17,552 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-03 05:47:17,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:47:17,758 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-03 05:47:17,759 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:47:17,956 INFO L354 Elim1Store]: treesize reduction 240, result has 16.1 percent of original size [2021-11-03 05:47:17,956 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 5 case distinctions, treesize of input 58 treesize of output 87 [2021-11-03 05:47:17,960 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 109 treesize of output 107 [2021-11-03 05:47:17,964 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-03 05:47:17,974 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-03 05:47:17,975 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 107 treesize of output 101 [2021-11-03 05:47:36,196 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:47:36,196 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:47:36,257 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:47:36,258 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-03 05:47:36,258 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1234228031] [2021-11-03 05:47:36,258 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1234228031] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-03 05:47:36,259 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:47:36,259 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 4 [2021-11-03 05:47:36,259 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1749087877] [2021-11-03 05:47:36,260 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-03 05:47:36,260 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-03 05:47:36,260 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-03 05:47:36,261 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-03 05:47:36,261 INFO L87 Difference]: Start difference. First operand 308 states and 418 transitions. Second operand has 6 states, 5 states have (on average 3.2) internal successors, (16), 5 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:47:38,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:47:38,788 INFO L93 Difference]: Finished difference Result 437 states and 522 transitions. [2021-11-03 05:47:38,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-03 05:47:38,789 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 3.2) internal successors, (16), 5 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-03 05:47:38,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:47:38,792 INFO L225 Difference]: With dead ends: 437 [2021-11-03 05:47:38,792 INFO L226 Difference]: Without dead ends: 437 [2021-11-03 05:47:38,793 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=43, Unknown=0, NotChecked=0, Total=72 [2021-11-03 05:47:38,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 437 states. [2021-11-03 05:47:38,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 437 to 310. [2021-11-03 05:47:38,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 310 states, 261 states have (on average 1.5977011494252873) internal successors, (417), 309 states have internal predecessors, (417), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:47:38,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 310 states to 310 states and 417 transitions. [2021-11-03 05:47:38,807 INFO L78 Accepts]: Start accepts. Automaton has 310 states and 417 transitions. Word has length 8 [2021-11-03 05:47:38,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:47:38,807 INFO L470 AbstractCegarLoop]: Abstraction has 310 states and 417 transitions. [2021-11-03 05:47:38,808 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 3.2) internal successors, (16), 5 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:47:38,808 INFO L276 IsEmpty]: Start isEmpty. Operand 310 states and 417 transitions. [2021-11-03 05:47:38,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-03 05:47:38,809 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:47:38,809 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:47:38,825 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-03 05:47:39,025 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 [2021-11-03 05:47:39,025 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-03 05:47:39,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:47:39,026 INFO L85 PathProgramCache]: Analyzing trace with hash -319620029, now seen corresponding path program 1 times [2021-11-03 05:47:39,026 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-03 05:47:39,026 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [473808082] [2021-11-03 05:47:39,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:47:39,027 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-03 05:47:39,027 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat [2021-11-03 05:47:39,028 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-03 05:47:39,030 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-03 05:47:39,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:47:39,272 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-03 05:47:39,274 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:47:39,557 INFO L354 Elim1Store]: treesize reduction 483, result has 13.6 percent of original size [2021-11-03 05:47:39,559 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 7 case distinctions, treesize of input 151 treesize of output 197 [2021-11-03 05:47:39,573 INFO L354 Elim1Store]: treesize reduction 4, result has 71.4 percent of original size [2021-11-03 05:47:39,573 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 197 treesize of output 193 [2021-11-03 05:47:58,457 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 126 treesize of output 106 [2021-11-03 05:48:00,157 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:48:00,157 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:48:00,563 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:48:00,567 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-03 05:48:00,568 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [473808082] [2021-11-03 05:48:00,568 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [473808082] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:48:00,568 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1574230455] [2021-11-03 05:48:00,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:48:00,569 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-03 05:48:00,569 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/cvc4 [2021-11-03 05:48:00,571 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-03 05:48:00,572 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/cvc4 --incremental --print-success --lang smt (9)] Waiting until timeout for monitored process [2021-11-03 05:48:01,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:48:01,283 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-03 05:48:01,285 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:48:01,557 INFO L354 Elim1Store]: treesize reduction 491, result has 13.4 percent of original size [2021-11-03 05:48:01,558 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 8 case distinctions, treesize of input 297 treesize of output 335 [2021-11-03 05:48:23,324 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 138 treesize of output 118 [2021-11-03 05:48:25,849 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:48:25,849 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:48:26,420 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:48:26,420 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1574230455] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:48:26,420 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [171058307] [2021-11-03 05:48:26,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:48:26,421 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:48:26,421 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:48:26,423 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:48:26,424 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-03 05:48:26,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:48:26,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-03 05:48:26,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:48:27,884 INFO L354 Elim1Store]: treesize reduction 507, result has 13.0 percent of original size [2021-11-03 05:48:27,884 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 11 case distinctions, treesize of input 311 treesize of output 349 [2021-11-03 05:48:28,062 INFO L354 Elim1Store]: treesize reduction 380, result has 7.8 percent of original size [2021-11-03 05:48:28,063 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 5 case distinctions, treesize of input 351 treesize of output 360 [2021-11-03 05:48:56,287 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 161 treesize of output 137 [2021-11-03 05:48:56,361 INFO L354 Elim1Store]: treesize reduction 100, result has 17.4 percent of original size [2021-11-03 05:48:56,362 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 134 treesize of output 140 [2021-11-03 05:48:59,824 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:48:59,824 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:49:00,513 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:49:00,513 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [171058307] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:49:00,513 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-11-03 05:49:00,513 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 4, 4] total 25 [2021-11-03 05:49:00,513 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [930355342] [2021-11-03 05:49:00,514 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-03 05:49:00,514 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-03 05:49:00,515 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-03 05:49:00,515 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=558, Unknown=0, NotChecked=0, Total=702 [2021-11-03 05:49:00,516 INFO L87 Difference]: Start difference. First operand 310 states and 417 transitions. Second operand has 27 states, 26 states have (on average 2.8846153846153846) internal successors, (75), 26 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:49:37,717 WARN L207 SmtUtils]: Spent 10.20 s on a formula simplification. DAG size of input: 139 DAG size of output: 107 [2021-11-03 05:50:18,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:50:18,418 INFO L93 Difference]: Finished difference Result 922 states and 1162 transitions. [2021-11-03 05:50:18,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-03 05:50:18,420 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 2.8846153846153846) internal successors, (75), 26 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-11-03 05:50:18,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:50:18,432 INFO L225 Difference]: With dead ends: 922 [2021-11-03 05:50:18,433 INFO L226 Difference]: Without dead ends: 922 [2021-11-03 05:50:18,434 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 462 ImplicationChecksByTransitivity, 54.2s TimeCoverageRelationStatistics Valid=443, Invalid=1532, Unknown=5, NotChecked=0, Total=1980 [2021-11-03 05:50:18,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 922 states. [2021-11-03 05:50:18,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 922 to 406. [2021-11-03 05:50:18,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 406 states, 357 states have (on average 1.5658263305322129) internal successors, (559), 405 states have internal predecessors, (559), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:50:18,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 406 states to 406 states and 559 transitions. [2021-11-03 05:50:18,453 INFO L78 Accepts]: Start accepts. Automaton has 406 states and 559 transitions. Word has length 13 [2021-11-03 05:50:18,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:50:18,453 INFO L470 AbstractCegarLoop]: Abstraction has 406 states and 559 transitions. [2021-11-03 05:50:18,454 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 2.8846153846153846) internal successors, (75), 26 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:50:18,454 INFO L276 IsEmpty]: Start isEmpty. Operand 406 states and 559 transitions. [2021-11-03 05:50:18,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-03 05:50:18,455 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:50:18,455 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:50:18,483 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-03 05:50:18,673 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/cvc4 --incremental --print-success --lang smt (9)] Forceful destruction successful, exit code 0 [2021-11-03 05:50:18,895 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-03 05:50:19,070 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/cvc4 --incremental --print-success --lang smt,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:50:19,070 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr3ASSERT_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-03 05:50:19,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:50:19,071 INFO L85 PathProgramCache]: Analyzing trace with hash -1318286260, now seen corresponding path program 1 times [2021-11-03 05:50:19,071 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-03 05:50:19,072 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [592626966] [2021-11-03 05:50:19,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:50:19,072 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-03 05:50:19,072 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat [2021-11-03 05:50:19,073 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-03 05:50:19,076 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-03 05:50:19,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:50:19,551 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-03 05:50:19,553 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:50:19,899 INFO L354 Elim1Store]: treesize reduction 354, result has 14.1 percent of original size [2021-11-03 05:50:19,899 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 5 case distinctions, treesize of input 101 treesize of output 136 [2021-11-03 05:50:19,909 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-03 05:50:19,910 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 314 treesize of output 308 [2021-11-03 05:50:19,942 INFO L354 Elim1Store]: treesize reduction 4, result has 71.4 percent of original size [2021-11-03 05:50:19,943 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 308 treesize of output 304 [2021-11-03 05:50:46,359 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 120 treesize of output 112 [2021-11-03 05:50:46,364 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 109 treesize of output 85 [2021-11-03 05:50:53,482 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:50:53,482 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:50:53,811 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:50:53,813 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-03 05:50:53,813 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [592626966] [2021-11-03 05:50:53,813 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [592626966] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:50:53,814 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [947416038] [2021-11-03 05:50:53,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:50:53,814 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-03 05:50:53,814 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/cvc4 [2021-11-03 05:50:53,816 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-03 05:50:53,818 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/cvc4 --incremental --print-success --lang smt (12)] Waiting until timeout for monitored process [2021-11-03 05:50:54,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:50:54,765 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-03 05:50:54,766 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:50:55,080 INFO L354 Elim1Store]: treesize reduction 354, result has 14.1 percent of original size [2021-11-03 05:50:55,080 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 5 case distinctions, treesize of input 102 treesize of output 137 [2021-11-03 05:50:55,092 INFO L354 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2021-11-03 05:50:55,093 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 395 treesize of output 387 [2021-11-03 05:51:25,809 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 128 treesize of output 120 [2021-11-03 05:51:25,817 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 117 treesize of output 93 [2021-11-03 05:51:34,198 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:51:34,199 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:51:34,318 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:51:34,318 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [947416038] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:51:34,319 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [13923097] [2021-11-03 05:51:34,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:51:34,319 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:51:34,319 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:51:34,320 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:51:34,321 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-03 05:51:34,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:51:34,941 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-03 05:51:34,942 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:51:35,140 INFO L354 Elim1Store]: treesize reduction 354, result has 14.1 percent of original size [2021-11-03 05:51:35,140 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 5 case distinctions, treesize of input 52 treesize of output 87 [2021-11-03 05:51:35,146 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 129 treesize of output 127 [2021-11-03 05:51:37,626 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 79 treesize of output 71 [2021-11-03 05:51:37,629 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 68 treesize of output 52 [2021-11-03 05:51:38,559 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:51:38,559 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:51:39,067 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:51:39,067 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [13923097] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:51:39,067 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-11-03 05:51:39,067 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4, 4] total 19 [2021-11-03 05:51:39,067 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1028353789] [2021-11-03 05:51:39,068 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-03 05:51:39,068 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-03 05:51:39,068 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-03 05:51:39,068 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=318, Unknown=0, NotChecked=0, Total=420 [2021-11-03 05:51:39,069 INFO L87 Difference]: Start difference. First operand 406 states and 559 transitions. Second operand has 21 states, 20 states have (on average 3.4) internal successors, (68), 20 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) [2021-11-03 05:51:57,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:51:57,181 INFO L93 Difference]: Finished difference Result 1090 states and 1318 transitions. [2021-11-03 05:51:57,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-03 05:51:57,183 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 3.4) internal successors, (68), 20 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 14 [2021-11-03 05:51:57,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:51:57,191 INFO L225 Difference]: With dead ends: 1090 [2021-11-03 05:51:57,191 INFO L226 Difference]: Without dead ends: 1090 [2021-11-03 05:51:57,192 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 309 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=266, Invalid=856, Unknown=0, NotChecked=0, Total=1122 [2021-11-03 05:51:57,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1090 states. [2021-11-03 05:51:57,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1090 to 487. [2021-11-03 05:51:57,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 487 states, 438 states have (on average 1.5319634703196348) internal successors, (671), 486 states have internal predecessors, (671), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:51:57,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 487 states to 487 states and 671 transitions. [2021-11-03 05:51:57,215 INFO L78 Accepts]: Start accepts. Automaton has 487 states and 671 transitions. Word has length 14 [2021-11-03 05:51:57,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:51:57,215 INFO L470 AbstractCegarLoop]: Abstraction has 487 states and 671 transitions. [2021-11-03 05:51:57,216 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 3.4) internal successors, (68), 20 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) [2021-11-03 05:51:57,216 INFO L276 IsEmpty]: Start isEmpty. Operand 487 states and 671 transitions. [2021-11-03 05:51:57,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-03 05:51:57,217 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:51:57,217 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:51:57,236 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-03 05:51:57,473 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-03 05:51:57,635 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/cvc4 --incremental --print-success --lang smt (12)] Forceful destruction successful, exit code 0 [2021-11-03 05:51:57,833 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/cvc4 --incremental --print-success --lang smt [2021-11-03 05:51:57,833 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr10ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-03 05:51:57,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:51:57,833 INFO L85 PathProgramCache]: Analyzing trace with hash -723310514, now seen corresponding path program 1 times [2021-11-03 05:51:57,834 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-03 05:51:57,834 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [788249857] [2021-11-03 05:51:57,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:51:57,834 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-03 05:51:57,834 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat [2021-11-03 05:51:57,835 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-03 05:51:57,836 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-03 05:51:58,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:51:58,499 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-03 05:51:58,500 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:51:58,551 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:51:58,551 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:51:58,584 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:51:58,585 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-03 05:51:58,585 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [788249857] [2021-11-03 05:51:58,585 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [788249857] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-03 05:51:58,585 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:51:58,585 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-03 05:51:58,585 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [518075434] [2021-11-03 05:51:58,586 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-03 05:51:58,586 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-03 05:51:58,586 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-03 05:51:58,586 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 05:51:58,587 INFO L87 Difference]: Start difference. First operand 487 states and 671 transitions. Second operand has 3 states, 3 states have (on average 5.333333333333333) internal successors, (16), 3 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:51:58,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:51:58,603 INFO L93 Difference]: Finished difference Result 534 states and 714 transitions. [2021-11-03 05:51:58,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-03 05:51:58,603 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.333333333333333) internal successors, (16), 3 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-03 05:51:58,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:51:58,607 INFO L225 Difference]: With dead ends: 534 [2021-11-03 05:51:58,607 INFO L226 Difference]: Without dead ends: 534 [2021-11-03 05:51:58,607 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 05:51:58,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 534 states. [2021-11-03 05:51:58,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 534 to 352. [2021-11-03 05:51:58,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 352 states, 321 states have (on average 1.485981308411215) internal successors, (477), 351 states have internal predecessors, (477), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:51:58,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 352 states to 352 states and 477 transitions. [2021-11-03 05:51:58,618 INFO L78 Accepts]: Start accepts. Automaton has 352 states and 477 transitions. Word has length 16 [2021-11-03 05:51:58,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:51:58,619 INFO L470 AbstractCegarLoop]: Abstraction has 352 states and 477 transitions. [2021-11-03 05:51:58,619 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.333333333333333) internal successors, (16), 3 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:51:58,619 INFO L276 IsEmpty]: Start isEmpty. Operand 352 states and 477 transitions. [2021-11-03 05:51:58,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-03 05:51:58,620 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:51:58,620 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:51:58,640 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-03 05:51:58,834 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 [2021-11-03 05:51:58,835 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr16ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-03 05:51:58,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:51:58,835 INFO L85 PathProgramCache]: Analyzing trace with hash -947173666, now seen corresponding path program 1 times [2021-11-03 05:51:58,836 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-03 05:51:58,836 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [507437195] [2021-11-03 05:51:58,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:51:58,836 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-03 05:51:58,836 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat [2021-11-03 05:51:58,838 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-03 05:51:58,839 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-03 05:51:59,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:51:59,511 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-03 05:51:59,512 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:51:59,667 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:51:59,667 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:51:59,790 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:51:59,790 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-03 05:51:59,790 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [507437195] [2021-11-03 05:51:59,791 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [507437195] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-03 05:51:59,791 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:51:59,791 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-11-03 05:51:59,791 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1347520481] [2021-11-03 05:51:59,791 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-03 05:51:59,791 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-03 05:51:59,792 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-03 05:51:59,792 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 05:51:59,792 INFO L87 Difference]: Start difference. First operand 352 states and 477 transitions. Second operand has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 2 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) [2021-11-03 05:51:59,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:51:59,837 INFO L93 Difference]: Finished difference Result 430 states and 562 transitions. [2021-11-03 05:51:59,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-03 05:51:59,838 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 2 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 17 [2021-11-03 05:51:59,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:51:59,840 INFO L225 Difference]: With dead ends: 430 [2021-11-03 05:51:59,840 INFO L226 Difference]: Without dead ends: 430 [2021-11-03 05:51:59,841 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 05:51:59,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 430 states. [2021-11-03 05:51:59,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 430 to 410. [2021-11-03 05:51:59,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 410 states, 383 states have (on average 1.4543080939947781) internal successors, (557), 409 states have internal predecessors, (557), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:51:59,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 410 states to 410 states and 557 transitions. [2021-11-03 05:51:59,851 INFO L78 Accepts]: Start accepts. Automaton has 410 states and 557 transitions. Word has length 17 [2021-11-03 05:51:59,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:51:59,852 INFO L470 AbstractCegarLoop]: Abstraction has 410 states and 557 transitions. [2021-11-03 05:51:59,852 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 2 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) [2021-11-03 05:51:59,852 INFO L276 IsEmpty]: Start isEmpty. Operand 410 states and 557 transitions. [2021-11-03 05:51:59,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-03 05:51:59,853 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:51:59,853 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1] [2021-11-03 05:51:59,870 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-03 05:52:00,066 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 [2021-11-03 05:52:00,066 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-03 05:52:00,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:52:00,067 INFO L85 PathProgramCache]: Analyzing trace with hash -473015532, now seen corresponding path program 1 times [2021-11-03 05:52:00,067 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-03 05:52:00,067 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1411639676] [2021-11-03 05:52:00,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:52:00,068 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-03 05:52:00,068 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat [2021-11-03 05:52:00,068 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-03 05:52:00,070 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-03 05:52:00,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:52:00,633 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-03 05:52:00,634 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:52:00,717 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:52:00,717 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:52:00,803 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:52:00,804 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-03 05:52:00,804 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1411639676] [2021-11-03 05:52:00,804 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1411639676] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:52:00,804 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1211992617] [2021-11-03 05:52:00,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:52:00,805 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-03 05:52:00,805 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/cvc4 [2021-11-03 05:52:00,806 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-03 05:52:00,807 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-11-03 05:52:02,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:52:02,040 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-03 05:52:02,041 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:52:02,091 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:52:02,091 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:52:02,153 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:52:02,154 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1211992617] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:52:02,154 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1306820796] [2021-11-03 05:52:02,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:52:02,154 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 05:52:02,154 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 05:52:02,155 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 05:52:02,156 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-03 05:52:03,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:52:03,147 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-03 05:52:03,148 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:52:03,202 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:52:03,202 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:52:03,269 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:52:03,270 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1306820796] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 05:52:03,270 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-11-03 05:52:03,270 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 8 [2021-11-03 05:52:03,270 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [539166787] [2021-11-03 05:52:03,271 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-03 05:52:03,271 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-03 05:52:03,271 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-03 05:52:03,271 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-03 05:52:03,272 INFO L87 Difference]: Start difference. First operand 410 states and 557 transitions. Second operand has 8 states, 8 states have (on average 4.75) internal successors, (38), 8 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:52:03,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:52:03,524 INFO L93 Difference]: Finished difference Result 351 states and 423 transitions. [2021-11-03 05:52:03,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-03 05:52:03,525 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.75) internal successors, (38), 8 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-11-03 05:52:03,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:52:03,527 INFO L225 Difference]: With dead ends: 351 [2021-11-03 05:52:03,527 INFO L226 Difference]: Without dead ends: 351 [2021-11-03 05:52:03,528 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-03 05:52:03,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 351 states. [2021-11-03 05:52:03,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 351 to 253. [2021-11-03 05:52:03,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 253 states, 235 states have (on average 1.3404255319148937) internal successors, (315), 252 states have internal predecessors, (315), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:52:03,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 253 states to 253 states and 315 transitions. [2021-11-03 05:52:03,536 INFO L78 Accepts]: Start accepts. Automaton has 253 states and 315 transitions. Word has length 20 [2021-11-03 05:52:03,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:52:03,536 INFO L470 AbstractCegarLoop]: Abstraction has 253 states and 315 transitions. [2021-11-03 05:52:03,536 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.75) internal successors, (38), 8 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:52:03,537 INFO L276 IsEmpty]: Start isEmpty. Operand 253 states and 315 transitions. [2021-11-03 05:52:03,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-03 05:52:03,537 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:52:03,538 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:52:03,579 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-03 05:52:03,756 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/cvc4 --incremental --print-success --lang smt (17)] Ended with exit code 0 [2021-11-03 05:52:03,969 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-03 05:52:04,153 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/cvc4 --incremental --print-success --lang smt,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 [2021-11-03 05:52:04,154 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr23ASSERT_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-03 05:52:04,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:52:04,154 INFO L85 PathProgramCache]: Analyzing trace with hash -1274183519, now seen corresponding path program 1 times [2021-11-03 05:52:04,154 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-03 05:52:04,154 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [930016845] [2021-11-03 05:52:04,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:52:04,155 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-03 05:52:04,155 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat [2021-11-03 05:52:04,155 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-03 05:52:04,156 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-11-03 05:52:04,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:52:04,763 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-03 05:52:04,764 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:52:04,925 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 [2021-11-03 05:52:04,967 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:52:04,967 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:52:05,142 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:52:05,142 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-03 05:52:05,142 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [930016845] [2021-11-03 05:52:05,142 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [930016845] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-03 05:52:05,142 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:52:05,142 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 9 [2021-11-03 05:52:05,145 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1232003003] [2021-11-03 05:52:05,145 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-03 05:52:05,145 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-03 05:52:05,146 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-03 05:52:05,146 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-11-03 05:52:05,146 INFO L87 Difference]: Start difference. First operand 253 states and 315 transitions. Second operand has 10 states, 10 states have (on average 3.6) internal successors, (36), 9 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:52:05,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:52:05,613 INFO L93 Difference]: Finished difference Result 472 states and 567 transitions. [2021-11-03 05:52:05,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-03 05:52:05,615 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.6) internal successors, (36), 9 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-11-03 05:52:05,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:52:05,618 INFO L225 Difference]: With dead ends: 472 [2021-11-03 05:52:05,618 INFO L226 Difference]: Without dead ends: 472 [2021-11-03 05:52:05,618 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2021-11-03 05:52:05,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 472 states. [2021-11-03 05:52:05,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 472 to 272. [2021-11-03 05:52:05,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 272 states, 254 states have (on average 1.3188976377952757) internal successors, (335), 271 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) [2021-11-03 05:52:05,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 335 transitions. [2021-11-03 05:52:05,627 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 335 transitions. Word has length 22 [2021-11-03 05:52:05,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:52:05,627 INFO L470 AbstractCegarLoop]: Abstraction has 272 states and 335 transitions. [2021-11-03 05:52:05,628 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.6) internal successors, (36), 9 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:52:05,628 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 335 transitions. [2021-11-03 05:52:05,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-03 05:52:05,629 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:52:05,629 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:52:05,644 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (19)] Forceful destruction successful, exit code 0 [2021-11-03 05:52:05,844 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 [2021-11-03 05:52:05,845 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr23ASSERT_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-03 05:52:05,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:52:05,845 INFO L85 PathProgramCache]: Analyzing trace with hash 1727901217, now seen corresponding path program 1 times [2021-11-03 05:52:05,846 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-03 05:52:05,846 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [882602175] [2021-11-03 05:52:05,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:52:05,846 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-03 05:52:05,847 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat [2021-11-03 05:52:05,847 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-03 05:52:05,890 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-03 05:52:06,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:52:06,571 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-03 05:52:06,573 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:52:06,613 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:52:06,614 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:52:06,650 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:52:06,651 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-03 05:52:06,651 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [882602175] [2021-11-03 05:52:06,651 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [882602175] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-03 05:52:06,651 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:52:06,651 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-03 05:52:06,653 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [500197982] [2021-11-03 05:52:06,654 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-03 05:52:06,654 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-03 05:52:06,655 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-03 05:52:06,655 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 05:52:06,655 INFO L87 Difference]: Start difference. First operand 272 states and 335 transitions. Second operand has 3 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:52:06,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:52:06,675 INFO L93 Difference]: Finished difference Result 229 states and 267 transitions. [2021-11-03 05:52:06,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-03 05:52:06,676 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-11-03 05:52:06,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:52:06,679 INFO L225 Difference]: With dead ends: 229 [2021-11-03 05:52:06,679 INFO L226 Difference]: Without dead ends: 229 [2021-11-03 05:52:06,679 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 05:52:06,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 229 states. [2021-11-03 05:52:06,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 229 to 218. [2021-11-03 05:52:06,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 218 states, 200 states have (on average 1.305) internal successors, (261), 217 states have internal predecessors, (261), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:52:06,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 261 transitions. [2021-11-03 05:52:06,685 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 261 transitions. Word has length 22 [2021-11-03 05:52:06,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:52:06,686 INFO L470 AbstractCegarLoop]: Abstraction has 218 states and 261 transitions. [2021-11-03 05:52:06,686 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:52:06,686 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 261 transitions. [2021-11-03 05:52:06,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-03 05:52:06,688 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:52:06,688 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:52:06,706 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-03 05:52:06,902 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 [2021-11-03 05:52:06,902 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr23ASSERT_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-03 05:52:06,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:52:06,903 INFO L85 PathProgramCache]: Analyzing trace with hash -1759672387, now seen corresponding path program 1 times [2021-11-03 05:52:06,903 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-03 05:52:06,903 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1402063563] [2021-11-03 05:52:06,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:52:06,904 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-03 05:52:06,904 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat [2021-11-03 05:52:06,905 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-03 05:52:06,919 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-03 05:52:07,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:52:07,637 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-03 05:52:07,638 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:52:07,833 INFO L354 Elim1Store]: treesize reduction 351, result has 15.4 percent of original size [2021-11-03 05:52:07,833 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 7 case distinctions, treesize of input 103 treesize of output 143 [2021-11-03 05:52:23,338 INFO L354 Elim1Store]: treesize reduction 175, result has 42.1 percent of original size [2021-11-03 05:52:23,338 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 28 case distinctions, treesize of input 105 treesize of output 216 [2021-11-03 05:53:14,277 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:53:14,277 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:53:14,534 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:53:14,534 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-03 05:53:14,534 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1402063563] [2021-11-03 05:53:14,534 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1402063563] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-03 05:53:14,534 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:53:14,534 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 4] imperfect sequences [] total 7 [2021-11-03 05:53:14,535 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2125299139] [2021-11-03 05:53:14,535 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-03 05:53:14,535 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-03 05:53:14,535 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-03 05:53:14,535 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-03 05:53:14,535 INFO L87 Difference]: Start difference. First operand 218 states and 261 transitions. Second operand has 9 states, 8 states have (on average 6.0) internal successors, (48), 8 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:53:15,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:53:15,329 INFO L93 Difference]: Finished difference Result 253 states and 287 transitions. [2021-11-03 05:53:15,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-03 05:53:15,341 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 6.0) internal successors, (48), 8 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-11-03 05:53:15,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:53:15,343 INFO L225 Difference]: With dead ends: 253 [2021-11-03 05:53:15,343 INFO L226 Difference]: Without dead ends: 253 [2021-11-03 05:53:15,344 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 37 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=38, Invalid=72, Unknown=0, NotChecked=0, Total=110 [2021-11-03 05:53:15,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 253 states. [2021-11-03 05:53:15,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 253 to 217. [2021-11-03 05:53:15,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 217 states, 200 states have (on average 1.295) internal successors, (259), 216 states have internal predecessors, (259), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:53:15,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 259 transitions. [2021-11-03 05:53:15,350 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 259 transitions. Word has length 24 [2021-11-03 05:53:15,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:53:15,350 INFO L470 AbstractCegarLoop]: Abstraction has 217 states and 259 transitions. [2021-11-03 05:53:15,350 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 6.0) internal successors, (48), 8 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:53:15,351 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 259 transitions. [2021-11-03 05:53:15,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-03 05:53:15,352 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:53:15,352 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 05:53:15,372 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (21)] Ended with exit code 0 [2021-11-03 05:53:15,572 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 [2021-11-03 05:53:15,572 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr24ASSERT_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-03 05:53:15,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:53:15,572 INFO L85 PathProgramCache]: Analyzing trace with hash 1284730989, now seen corresponding path program 1 times [2021-11-03 05:53:15,572 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-03 05:53:15,573 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [23694109] [2021-11-03 05:53:15,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:53:15,573 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-03 05:53:15,573 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat [2021-11-03 05:53:15,573 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-03 05:53:15,575 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-03 05:53:16,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:53:16,351 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-03 05:53:16,353 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:53:16,627 INFO L354 Elim1Store]: treesize reduction 240, result has 16.1 percent of original size [2021-11-03 05:53:16,628 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 5 case distinctions, treesize of input 68 treesize of output 97 [2021-11-03 05:53:16,841 INFO L354 Elim1Store]: treesize reduction 351, result has 15.4 percent of original size [2021-11-03 05:53:16,841 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 7 case distinctions, treesize of input 124 treesize of output 166 [2021-11-03 05:54:23,425 INFO L354 Elim1Store]: treesize reduction 134, result has 40.4 percent of original size [2021-11-03 05:54:23,426 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 157 treesize of output 231 [2021-11-03 05:54:23,587 INFO L354 Elim1Store]: treesize reduction 204, result has 13.2 percent of original size [2021-11-03 05:54:23,588 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 21 case distinctions, treesize of input 228 treesize of output 245 [2021-11-03 05:54:48,229 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:54:48,230 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 05:54:50,511 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 05:54:50,511 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-03 05:54:50,511 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [23694109] [2021-11-03 05:54:50,511 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [23694109] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-03 05:54:50,511 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-03 05:54:50,511 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 6 [2021-11-03 05:54:50,512 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [85971594] [2021-11-03 05:54:50,512 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-03 05:54:50,512 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-03 05:54:50,512 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-03 05:54:50,512 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=37, Unknown=1, NotChecked=0, Total=56 [2021-11-03 05:54:50,513 INFO L87 Difference]: Start difference. First operand 217 states and 259 transitions. Second operand has 8 states, 7 states have (on average 7.142857142857143) internal successors, (50), 7 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:55:00,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 05:55:00,079 INFO L93 Difference]: Finished difference Result 272 states and 300 transitions. [2021-11-03 05:55:00,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-03 05:55:00,080 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 7.142857142857143) internal successors, (50), 7 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2021-11-03 05:55:00,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 05:55:00,081 INFO L225 Difference]: With dead ends: 272 [2021-11-03 05:55:00,081 INFO L226 Difference]: Without dead ends: 272 [2021-11-03 05:55:00,082 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=69, Invalid=111, Unknown=2, NotChecked=0, Total=182 [2021-11-03 05:55:00,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 272 states. [2021-11-03 05:55:00,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 272 to 216. [2021-11-03 05:55:00,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 216 states, 200 states have (on average 1.285) internal successors, (257), 215 states have internal predecessors, (257), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:55:00,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 257 transitions. [2021-11-03 05:55:00,087 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 257 transitions. Word has length 25 [2021-11-03 05:55:00,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 05:55:00,088 INFO L470 AbstractCegarLoop]: Abstraction has 216 states and 257 transitions. [2021-11-03 05:55:00,088 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 7.142857142857143) internal successors, (50), 7 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 05:55:00,088 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 257 transitions. [2021-11-03 05:55:00,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-03 05:55:00,089 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 05:55:00,089 INFO L513 BasicCegarLoop]: trace histogram [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, 1] [2021-11-03 05:55:00,121 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-11-03 05:55:00,304 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 [2021-11-03 05:55:00,304 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr22ASSERT_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-03 05:55:00,304 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 05:55:00,304 INFO L85 PathProgramCache]: Analyzing trace with hash -219537710, now seen corresponding path program 1 times [2021-11-03 05:55:00,305 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-03 05:55:00,305 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [634582220] [2021-11-03 05:55:00,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 05:55:00,305 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-03 05:55:00,305 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat [2021-11-03 05:55:00,306 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-03 05:55:00,307 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00cc9a0-b0d8-4681-8980-cf6e4ba52772/bin/utaipan-aC7eJsxGYH/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-03 05:55:01,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 05:55:01,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-03 05:55:01,272 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 05:55:01,585 INFO L354 Elim1Store]: treesize reduction 354, result has 14.1 percent of original size [2021-11-03 05:55:01,585 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 5 case distinctions, treesize of input 103 treesize of output 138 [2021-11-03 05:55:01,596 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-03 05:55:01,596 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 305 treesize of output 295 [2021-11-03 05:55:01,617 INFO L354 Elim1Store]: treesize reduction 4, result has 71.4 percent of original size [2021-11-03 05:55:01,617 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 295 treesize of output 291 [2021-11-03 05:55:30,452 INFO L354 Elim1Store]: treesize reduction 176, result has 39.1 percent of original size [2021-11-03 05:55:30,453 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 21 case distinctions, treesize of input 115 treesize of output 208