./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/list-simple/dll2n_remove_all_reverse.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version b2eff8ba Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-simple/dll2n_remove_all_reverse.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 4d5c55d9a4a2ded389ff7ce077afdc88fb2d2855921e5fd1e3b93fbba7e140e8 ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.2.1-dev-b2eff8b [2021-10-28 08:41:55,095 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-28 08:41:55,100 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-28 08:41:55,161 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-28 08:41:55,162 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-28 08:41:55,164 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-28 08:41:55,166 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-28 08:41:55,169 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-28 08:41:55,172 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-28 08:41:55,174 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-28 08:41:55,176 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-28 08:41:55,177 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-28 08:41:55,178 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-28 08:41:55,180 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-28 08:41:55,182 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-28 08:41:55,185 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-28 08:41:55,186 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-28 08:41:55,188 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-28 08:41:55,191 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-28 08:41:55,194 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-28 08:41:55,197 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-28 08:41:55,199 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-28 08:41:55,201 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-28 08:41:55,203 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-28 08:41:55,207 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-28 08:41:55,208 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-28 08:41:55,209 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-28 08:41:55,210 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-28 08:41:55,211 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-28 08:41:55,213 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-28 08:41:55,214 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-28 08:41:55,215 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-28 08:41:55,217 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-28 08:41:55,218 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-28 08:41:55,220 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-28 08:41:55,220 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-28 08:41:55,221 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-28 08:41:55,222 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-28 08:41:55,222 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-28 08:41:55,224 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-28 08:41:55,225 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-28 08:41:55,226 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2021-10-28 08:41:55,255 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-28 08:41:55,256 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-28 08:41:55,256 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-10-28 08:41:55,257 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-10-28 08:41:55,258 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-10-28 08:41:55,259 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-10-28 08:41:55,259 INFO L138 SettingsManager]: * Use SBE=true [2021-10-28 08:41:55,260 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-28 08:41:55,260 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-28 08:41:55,260 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-10-28 08:41:55,261 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-10-28 08:41:55,261 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-28 08:41:55,262 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-28 08:41:55,262 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-10-28 08:41:55,262 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-10-28 08:41:55,263 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-10-28 08:41:55,263 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-28 08:41:55,263 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-10-28 08:41:55,264 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-28 08:41:55,264 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-28 08:41:55,265 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-28 08:41:55,265 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-10-28 08:41:55,265 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-28 08:41:55,266 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-28 08:41:55,266 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-28 08:41:55,267 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-28 08:41:55,267 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-10-28 08:41:55,267 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-10-28 08:41:55,268 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-28 08:41:55,268 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4d5c55d9a4a2ded389ff7ce077afdc88fb2d2855921e5fd1e3b93fbba7e140e8 [2021-10-28 08:41:55,601 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-28 08:41:55,634 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-28 08:41:55,639 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-28 08:41:55,642 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-28 08:41:55,644 INFO L275 PluginConnector]: CDTParser initialized [2021-10-28 08:41:55,646 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/../../sv-benchmarks/c/list-simple/dll2n_remove_all_reverse.i [2021-10-28 08:41:55,730 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/data/61490a653/a95f6d44f7b1431091a0ab36e0158837/FLAGfb9cf9da4 [2021-10-28 08:41:56,384 INFO L306 CDTParser]: Found 1 translation units. [2021-10-28 08:41:56,385 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/sv-benchmarks/c/list-simple/dll2n_remove_all_reverse.i [2021-10-28 08:41:56,401 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/data/61490a653/a95f6d44f7b1431091a0ab36e0158837/FLAGfb9cf9da4 [2021-10-28 08:41:56,619 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/data/61490a653/a95f6d44f7b1431091a0ab36e0158837 [2021-10-28 08:41:56,621 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-28 08:41:56,623 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-10-28 08:41:56,625 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-28 08:41:56,626 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-28 08:41:56,640 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-28 08:41:56,641 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.10 08:41:56" (1/1) ... [2021-10-28 08:41:56,642 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7ac5b10c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 08:41:56, skipping insertion in model container [2021-10-28 08:41:56,643 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.10 08:41:56" (1/1) ... [2021-10-28 08:41:56,655 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-28 08:41:56,733 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-28 08:41:57,217 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/sv-benchmarks/c/list-simple/dll2n_remove_all_reverse.i[24275,24288] [2021-10-28 08:41:57,227 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-28 08:41:57,247 INFO L203 MainTranslator]: Completed pre-run [2021-10-28 08:41:57,326 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/sv-benchmarks/c/list-simple/dll2n_remove_all_reverse.i[24275,24288] [2021-10-28 08:41:57,330 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-28 08:41:57,373 INFO L208 MainTranslator]: Completed translation [2021-10-28 08:41:57,374 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 08:41:57 WrapperNode [2021-10-28 08:41:57,374 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-28 08:41:57,377 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-28 08:41:57,377 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-28 08:41:57,378 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-28 08:41:57,392 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 08:41:57" (1/1) ... [2021-10-28 08:41:57,393 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 08:41:57" (1/1) ... [2021-10-28 08:41:57,432 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 08:41:57" (1/1) ... [2021-10-28 08:41:57,433 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 08:41:57" (1/1) ... [2021-10-28 08:41:57,461 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 08:41:57" (1/1) ... [2021-10-28 08:41:57,466 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 08:41:57" (1/1) ... [2021-10-28 08:41:57,470 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 08:41:57" (1/1) ... [2021-10-28 08:41:57,488 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-28 08:41:57,489 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-28 08:41:57,489 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-28 08:41:57,489 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-28 08:41:57,493 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 08:41:57" (1/1) ... [2021-10-28 08:41:57,511 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-28 08:41:57,524 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 [2021-10-28 08:41:57,538 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-10-28 08:41:57,561 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-10-28 08:41:57,592 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-10-28 08:41:57,592 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-28 08:41:57,592 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-10-28 08:41:57,592 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2021-10-28 08:41:57,592 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2021-10-28 08:41:57,592 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2021-10-28 08:41:57,593 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2021-10-28 08:41:57,593 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_create [2021-10-28 08:41:57,593 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_remove_last [2021-10-28 08:41:57,593 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-10-28 08:41:57,593 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-10-28 08:41:57,593 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-10-28 08:41:57,593 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-10-28 08:41:57,594 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-10-28 08:41:57,594 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-10-28 08:41:57,594 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-28 08:41:57,594 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2021-10-28 08:41:57,594 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2021-10-28 08:41:57,594 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2021-10-28 08:41:57,594 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2021-10-28 08:41:57,595 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2021-10-28 08:41:57,595 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2021-10-28 08:41:57,595 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2021-10-28 08:41:57,595 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2021-10-28 08:41:57,595 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2021-10-28 08:41:57,595 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2021-10-28 08:41:57,595 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2021-10-28 08:41:57,595 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2021-10-28 08:41:57,596 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2021-10-28 08:41:57,596 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2021-10-28 08:41:57,596 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2021-10-28 08:41:57,596 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2021-10-28 08:41:57,596 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2021-10-28 08:41:57,596 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2021-10-28 08:41:57,596 INFO L130 BoogieDeclarations]: Found specification of procedure select [2021-10-28 08:41:57,596 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2021-10-28 08:41:57,596 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2021-10-28 08:41:57,597 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2021-10-28 08:41:57,597 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2021-10-28 08:41:57,597 INFO L130 BoogieDeclarations]: Found specification of procedure random [2021-10-28 08:41:57,597 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2021-10-28 08:41:57,597 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2021-10-28 08:41:57,597 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2021-10-28 08:41:57,597 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2021-10-28 08:41:57,597 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2021-10-28 08:41:57,598 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2021-10-28 08:41:57,598 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2021-10-28 08:41:57,598 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2021-10-28 08:41:57,598 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2021-10-28 08:41:57,598 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2021-10-28 08:41:57,598 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2021-10-28 08:41:57,598 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2021-10-28 08:41:57,598 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2021-10-28 08:41:57,598 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2021-10-28 08:41:57,599 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2021-10-28 08:41:57,599 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2021-10-28 08:41:57,599 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2021-10-28 08:41:57,602 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2021-10-28 08:41:57,603 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2021-10-28 08:41:57,603 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2021-10-28 08:41:57,603 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2021-10-28 08:41:57,603 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2021-10-28 08:41:57,604 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2021-10-28 08:41:57,604 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2021-10-28 08:41:57,605 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2021-10-28 08:41:57,605 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2021-10-28 08:41:57,606 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2021-10-28 08:41:57,607 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2021-10-28 08:41:57,607 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2021-10-28 08:41:57,609 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2021-10-28 08:41:57,609 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2021-10-28 08:41:57,609 INFO L130 BoogieDeclarations]: Found specification of procedure free [2021-10-28 08:41:57,609 INFO L130 BoogieDeclarations]: Found specification of procedure cfree [2021-10-28 08:41:57,610 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2021-10-28 08:41:57,610 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2021-10-28 08:41:57,610 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2021-10-28 08:41:57,610 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2021-10-28 08:41:57,610 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2021-10-28 08:41:57,611 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2021-10-28 08:41:57,611 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2021-10-28 08:41:57,612 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2021-10-28 08:41:57,612 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2021-10-28 08:41:57,612 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2021-10-28 08:41:57,613 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2021-10-28 08:41:57,613 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2021-10-28 08:41:57,613 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2021-10-28 08:41:57,613 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2021-10-28 08:41:57,613 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2021-10-28 08:41:57,613 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2021-10-28 08:41:57,614 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2021-10-28 08:41:57,614 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2021-10-28 08:41:57,614 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2021-10-28 08:41:57,614 INFO L130 BoogieDeclarations]: Found specification of procedure system [2021-10-28 08:41:57,614 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2021-10-28 08:41:57,614 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2021-10-28 08:41:57,615 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2021-10-28 08:41:57,615 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2021-10-28 08:41:57,615 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2021-10-28 08:41:57,615 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2021-10-28 08:41:57,615 INFO L130 BoogieDeclarations]: Found specification of procedure div [2021-10-28 08:41:57,616 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2021-10-28 08:41:57,616 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2021-10-28 08:41:57,616 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2021-10-28 08:41:57,616 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2021-10-28 08:41:57,616 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2021-10-28 08:41:57,617 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2021-10-28 08:41:57,617 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2021-10-28 08:41:57,617 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2021-10-28 08:41:57,618 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2021-10-28 08:41:57,618 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2021-10-28 08:41:57,619 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2021-10-28 08:41:57,619 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2021-10-28 08:41:57,619 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2021-10-28 08:41:57,619 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2021-10-28 08:41:57,619 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2021-10-28 08:41:57,620 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2021-10-28 08:41:57,620 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2021-10-28 08:41:57,620 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2021-10-28 08:41:57,621 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2021-10-28 08:41:57,621 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2021-10-28 08:41:57,621 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2021-10-28 08:41:57,621 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2021-10-28 08:41:57,621 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-10-28 08:41:57,622 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-10-28 08:41:57,622 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-10-28 08:41:57,622 INFO L130 BoogieDeclarations]: Found specification of procedure dll_create [2021-10-28 08:41:57,623 INFO L130 BoogieDeclarations]: Found specification of procedure dll_remove_last [2021-10-28 08:41:57,624 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-10-28 08:41:57,627 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-10-28 08:41:57,627 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-10-28 08:41:57,628 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-10-28 08:41:57,629 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-10-28 08:41:57,629 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-10-28 08:41:57,630 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-28 08:41:57,630 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-10-28 08:41:57,996 INFO L758 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2021-10-28 08:41:58,390 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-28 08:41:58,390 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2021-10-28 08:41:58,393 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.10 08:41:58 BoogieIcfgContainer [2021-10-28 08:41:58,393 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-28 08:41:58,401 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-28 08:41:58,401 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-28 08:41:58,407 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-28 08:41:58,408 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 28.10 08:41:56" (1/3) ... [2021-10-28 08:41:58,426 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@611d1faa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.10 08:41:58, skipping insertion in model container [2021-10-28 08:41:58,426 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 08:41:57" (2/3) ... [2021-10-28 08:41:58,427 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@611d1faa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.10 08:41:58, skipping insertion in model container [2021-10-28 08:41:58,427 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.10 08:41:58" (3/3) ... [2021-10-28 08:41:58,429 INFO L111 eAbstractionObserver]: Analyzing ICFG dll2n_remove_all_reverse.i [2021-10-28 08:41:58,435 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-28 08:41:58,436 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 40 error locations. [2021-10-28 08:41:58,508 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-10-28 08:41:58,517 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 [2021-10-28 08:41:58,517 INFO L340 AbstractCegarLoop]: Starting to check reachability of 40 error locations. [2021-10-28 08:41:58,537 INFO L276 IsEmpty]: Start isEmpty. Operand has 88 states, 44 states have (on average 2.0) internal successors, (88), 78 states have internal predecessors, (88), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-10-28 08:41:58,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-10-28 08:41:58,548 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 08:41:58,549 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 08:41:58,549 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting dll_createErr0REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-28 08:41:58,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 08:41:58,556 INFO L85 PathProgramCache]: Analyzing trace with hash -961704470, now seen corresponding path program 1 times [2021-10-28 08:41:58,568 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 08:41:58,569 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1693559065] [2021-10-28 08:41:58,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:41:58,570 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 08:41:58,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:41:58,906 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 08:41:58,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:41:58,930 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 08:41:58,930 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 08:41:58,931 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1693559065] [2021-10-28 08:41:58,932 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1693559065] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-28 08:41:58,932 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-28 08:41:58,933 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-10-28 08:41:58,935 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [234667766] [2021-10-28 08:41:58,941 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-28 08:41:58,942 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 08:41:58,973 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-28 08:41:58,975 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-28 08:41:58,979 INFO L87 Difference]: Start difference. First operand has 88 states, 44 states have (on average 2.0) internal successors, (88), 78 states have internal predecessors, (88), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-28 08:41:59,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 08:41:59,350 INFO L93 Difference]: Finished difference Result 89 states and 95 transitions. [2021-10-28 08:41:59,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-28 08:41:59,352 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-10-28 08:41:59,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 08:41:59,371 INFO L225 Difference]: With dead ends: 89 [2021-10-28 08:41:59,371 INFO L226 Difference]: Without dead ends: 83 [2021-10-28 08:41:59,375 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-28 08:41:59,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-10-28 08:41:59,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 79. [2021-10-28 08:41:59,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 41 states have (on average 1.853658536585366) internal successors, (76), 71 states have internal predecessors, (76), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-28 08:41:59,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 83 transitions. [2021-10-28 08:41:59,443 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 83 transitions. Word has length 11 [2021-10-28 08:41:59,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 08:41:59,444 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 83 transitions. [2021-10-28 08:41:59,444 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-28 08:41:59,446 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 83 transitions. [2021-10-28 08:41:59,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-10-28 08:41:59,447 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 08:41:59,447 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 08:41:59,448 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-10-28 08:41:59,451 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting dll_createErr1REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-28 08:41:59,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 08:41:59,453 INFO L85 PathProgramCache]: Analyzing trace with hash -961704469, now seen corresponding path program 1 times [2021-10-28 08:41:59,453 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 08:41:59,453 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1682186438] [2021-10-28 08:41:59,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:41:59,453 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 08:41:59,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:41:59,579 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 08:41:59,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:41:59,614 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 08:41:59,615 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 08:41:59,615 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1682186438] [2021-10-28 08:41:59,616 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1682186438] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-28 08:41:59,616 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-28 08:41:59,616 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-10-28 08:41:59,616 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [604899482] [2021-10-28 08:41:59,618 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-28 08:41:59,618 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 08:41:59,619 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-28 08:41:59,619 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-28 08:41:59,620 INFO L87 Difference]: Start difference. First operand 79 states and 83 transitions. Second operand has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-28 08:41:59,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 08:41:59,882 INFO L93 Difference]: Finished difference Result 80 states and 85 transitions. [2021-10-28 08:41:59,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-28 08:41:59,883 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-10-28 08:41:59,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 08:41:59,886 INFO L225 Difference]: With dead ends: 80 [2021-10-28 08:41:59,886 INFO L226 Difference]: Without dead ends: 80 [2021-10-28 08:41:59,887 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-28 08:41:59,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-10-28 08:41:59,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 76. [2021-10-28 08:41:59,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 41 states have (on average 1.7804878048780488) internal successors, (73), 68 states have internal predecessors, (73), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-28 08:41:59,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 80 transitions. [2021-10-28 08:41:59,898 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 80 transitions. Word has length 11 [2021-10-28 08:41:59,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 08:41:59,899 INFO L470 AbstractCegarLoop]: Abstraction has 76 states and 80 transitions. [2021-10-28 08:41:59,899 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-28 08:41:59,900 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 80 transitions. [2021-10-28 08:41:59,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-10-28 08:41:59,901 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 08:41:59,901 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 08:41:59,901 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-10-28 08:41:59,902 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting mainErr1REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-28 08:41:59,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 08:41:59,903 INFO L85 PathProgramCache]: Analyzing trace with hash 950899493, now seen corresponding path program 1 times [2021-10-28 08:41:59,903 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 08:41:59,903 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [600366632] [2021-10-28 08:41:59,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:41:59,904 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 08:41:59,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:41:59,987 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 08:41:59,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:00,032 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-28 08:42:00,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:00,098 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 08:42:00,099 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 08:42:00,099 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [600366632] [2021-10-28 08:42:00,100 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [600366632] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-28 08:42:00,100 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-28 08:42:00,101 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-10-28 08:42:00,101 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [186945986] [2021-10-28 08:42:00,103 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-10-28 08:42:00,103 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 08:42:00,112 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-10-28 08:42:00,112 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-10-28 08:42:00,113 INFO L87 Difference]: Start difference. First operand 76 states and 80 transitions. Second operand has 7 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-10-28 08:42:00,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 08:42:00,588 INFO L93 Difference]: Finished difference Result 89 states and 94 transitions. [2021-10-28 08:42:00,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-10-28 08:42:00,589 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 15 [2021-10-28 08:42:00,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 08:42:00,590 INFO L225 Difference]: With dead ends: 89 [2021-10-28 08:42:00,591 INFO L226 Difference]: Without dead ends: 86 [2021-10-28 08:42:00,591 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-10-28 08:42:00,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-10-28 08:42:00,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 77. [2021-10-28 08:42:00,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 42 states have (on average 1.7619047619047619) internal successors, (74), 69 states have internal predecessors, (74), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-28 08:42:00,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 81 transitions. [2021-10-28 08:42:00,602 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 81 transitions. Word has length 15 [2021-10-28 08:42:00,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 08:42:00,602 INFO L470 AbstractCegarLoop]: Abstraction has 77 states and 81 transitions. [2021-10-28 08:42:00,602 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-10-28 08:42:00,603 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 81 transitions. [2021-10-28 08:42:00,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-10-28 08:42:00,603 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 08:42:00,603 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 08:42:00,604 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-10-28 08:42:00,604 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting dll_createErr6REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-28 08:42:00,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 08:42:00,605 INFO L85 PathProgramCache]: Analyzing trace with hash 2016813486, now seen corresponding path program 1 times [2021-10-28 08:42:00,605 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 08:42:00,605 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [425379923] [2021-10-28 08:42:00,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:42:00,606 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 08:42:00,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:00,697 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 08:42:00,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:00,721 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 08:42:00,722 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 08:42:00,722 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [425379923] [2021-10-28 08:42:00,722 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [425379923] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-28 08:42:00,723 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-28 08:42:00,723 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-10-28 08:42:00,723 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1982618896] [2021-10-28 08:42:00,724 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-28 08:42:00,724 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 08:42:00,725 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-28 08:42:00,732 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-28 08:42:00,732 INFO L87 Difference]: Start difference. First operand 77 states and 81 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-28 08:42:00,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 08:42:00,959 INFO L93 Difference]: Finished difference Result 83 states and 87 transitions. [2021-10-28 08:42:00,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-28 08:42:00,962 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-10-28 08:42:00,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 08:42:00,967 INFO L225 Difference]: With dead ends: 83 [2021-10-28 08:42:00,967 INFO L226 Difference]: Without dead ends: 83 [2021-10-28 08:42:00,970 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-10-28 08:42:00,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-10-28 08:42:00,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 82. [2021-10-28 08:42:00,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 47 states have (on average 1.6808510638297873) internal successors, (79), 74 states have internal predecessors, (79), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-28 08:42:00,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 86 transitions. [2021-10-28 08:42:00,993 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 86 transitions. Word has length 15 [2021-10-28 08:42:00,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 08:42:00,994 INFO L470 AbstractCegarLoop]: Abstraction has 82 states and 86 transitions. [2021-10-28 08:42:00,994 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-28 08:42:00,994 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 86 transitions. [2021-10-28 08:42:00,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-10-28 08:42:00,995 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 08:42:00,996 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] [2021-10-28 08:42:00,996 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-10-28 08:42:00,996 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting mainErr1REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-28 08:42:00,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 08:42:00,997 INFO L85 PathProgramCache]: Analyzing trace with hash -1092107051, now seen corresponding path program 1 times [2021-10-28 08:42:00,997 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 08:42:00,998 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [876453467] [2021-10-28 08:42:00,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:42:00,999 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 08:42:01,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:01,115 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 08:42:01,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:01,138 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-28 08:42:01,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:01,227 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 08:42:01,227 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 08:42:01,227 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [876453467] [2021-10-28 08:42:01,228 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [876453467] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 08:42:01,228 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [427862455] [2021-10-28 08:42:01,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:42:01,228 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 08:42:01,229 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 [2021-10-28 08:42:01,237 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-28 08:42:01,256 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-10-28 08:42:01,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:01,403 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 5 conjunts are in the unsatisfiable core [2021-10-28 08:42:01,413 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-28 08:42:01,604 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 08:42:01,605 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [427862455] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 08:42:01,605 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-28 08:42:01,605 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6] total 10 [2021-10-28 08:42:01,606 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [78465427] [2021-10-28 08:42:01,606 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-10-28 08:42:01,620 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 08:42:01,620 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-10-28 08:42:01,621 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-10-28 08:42:01,621 INFO L87 Difference]: Start difference. First operand 82 states and 86 transitions. Second operand has 10 states, 8 states have (on average 3.375) internal successors, (27), 8 states have internal predecessors, (27), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-28 08:42:02,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 08:42:02,092 INFO L93 Difference]: Finished difference Result 96 states and 101 transitions. [2021-10-28 08:42:02,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-10-28 08:42:02,093 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 3.375) internal successors, (27), 8 states have internal predecessors, (27), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 22 [2021-10-28 08:42:02,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 08:42:02,094 INFO L225 Difference]: With dead ends: 96 [2021-10-28 08:42:02,094 INFO L226 Difference]: Without dead ends: 93 [2021-10-28 08:42:02,095 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2021-10-28 08:42:02,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-10-28 08:42:02,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 84. [2021-10-28 08:42:02,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 49 states have (on average 1.653061224489796) internal successors, (81), 76 states have internal predecessors, (81), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-28 08:42:02,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 88 transitions. [2021-10-28 08:42:02,105 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 88 transitions. Word has length 22 [2021-10-28 08:42:02,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 08:42:02,119 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 88 transitions. [2021-10-28 08:42:02,120 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 3.375) internal successors, (27), 8 states have internal predecessors, (27), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-28 08:42:02,120 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 88 transitions. [2021-10-28 08:42:02,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-10-28 08:42:02,121 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 08:42:02,122 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 08:42:02,177 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-10-28 08:42:02,341 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 08:42:02,342 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting dll_createErr6REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-28 08:42:02,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 08:42:02,342 INFO L85 PathProgramCache]: Analyzing trace with hash -26193058, now seen corresponding path program 1 times [2021-10-28 08:42:02,342 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 08:42:02,343 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [147049890] [2021-10-28 08:42:02,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:42:02,343 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 08:42:02,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:02,502 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 08:42:02,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:02,516 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 08:42:02,516 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 08:42:02,516 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [147049890] [2021-10-28 08:42:02,517 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [147049890] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 08:42:02,517 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [144471421] [2021-10-28 08:42:02,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:42:02,517 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 08:42:02,517 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 [2021-10-28 08:42:02,521 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-28 08:42:02,560 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-10-28 08:42:02,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:02,732 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 7 conjunts are in the unsatisfiable core [2021-10-28 08:42:02,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-28 08:42:02,843 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-28 08:42:02,905 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-10-28 08:42:02,906 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 2 case distinctions, treesize of input 17 treesize of output 21 [2021-10-28 08:42:03,165 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 08:42:03,166 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [144471421] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 08:42:03,166 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-28 08:42:03,166 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-10-28 08:42:03,167 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [273415339] [2021-10-28 08:42:03,167 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-10-28 08:42:03,167 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 08:42:03,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-10-28 08:42:03,168 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-10-28 08:42:03,169 INFO L87 Difference]: Start difference. First operand 84 states and 88 transitions. Second operand has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 6 states have internal predecessors, (26), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-28 08:42:03,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 08:42:03,436 INFO L93 Difference]: Finished difference Result 83 states and 87 transitions. [2021-10-28 08:42:03,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-10-28 08:42:03,437 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 6 states have internal predecessors, (26), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2021-10-28 08:42:03,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 08:42:03,444 INFO L225 Difference]: With dead ends: 83 [2021-10-28 08:42:03,445 INFO L226 Difference]: Without dead ends: 83 [2021-10-28 08:42:03,445 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2021-10-28 08:42:03,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-10-28 08:42:03,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2021-10-28 08:42:03,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 49 states have (on average 1.6326530612244898) internal successors, (80), 75 states have internal predecessors, (80), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-28 08:42:03,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 87 transitions. [2021-10-28 08:42:03,467 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 87 transitions. Word has length 22 [2021-10-28 08:42:03,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 08:42:03,468 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 87 transitions. [2021-10-28 08:42:03,468 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 6 states have internal predecessors, (26), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-28 08:42:03,468 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 87 transitions. [2021-10-28 08:42:03,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-10-28 08:42:03,469 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 08:42:03,470 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 08:42:03,525 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-10-28 08:42:03,684 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 08:42:03,684 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting dll_createErr7REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-28 08:42:03,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 08:42:03,685 INFO L85 PathProgramCache]: Analyzing trace with hash -26193057, now seen corresponding path program 1 times [2021-10-28 08:42:03,685 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 08:42:03,685 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1707795908] [2021-10-28 08:42:03,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:42:03,686 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 08:42:03,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:03,865 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 08:42:03,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:03,880 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 08:42:03,881 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 08:42:03,881 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1707795908] [2021-10-28 08:42:03,881 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1707795908] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 08:42:03,881 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [567702827] [2021-10-28 08:42:03,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:42:03,882 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 08:42:03,882 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 [2021-10-28 08:42:03,884 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-28 08:42:03,905 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-10-28 08:42:04,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:04,075 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 12 conjunts are in the unsatisfiable core [2021-10-28 08:42:04,080 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-28 08:42:04,152 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-28 08:42:04,375 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-28 08:42:04,376 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 22 treesize of output 24 [2021-10-28 08:42:04,395 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-10-28 08:42:04,395 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 21 treesize of output 21 [2021-10-28 08:42:04,623 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 08:42:04,624 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [567702827] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 08:42:04,624 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-28 08:42:04,624 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 8 [2021-10-28 08:42:04,625 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1675904727] [2021-10-28 08:42:04,626 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-10-28 08:42:04,626 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 08:42:04,627 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-10-28 08:42:04,631 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-10-28 08:42:04,632 INFO L87 Difference]: Start difference. First operand 83 states and 87 transitions. Second operand has 9 states, 8 states have (on average 4.125) internal successors, (33), 8 states have internal predecessors, (33), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-28 08:42:05,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 08:42:05,127 INFO L93 Difference]: Finished difference Result 82 states and 86 transitions. [2021-10-28 08:42:05,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-10-28 08:42:05,128 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 4.125) internal successors, (33), 8 states have internal predecessors, (33), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2021-10-28 08:42:05,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 08:42:05,129 INFO L225 Difference]: With dead ends: 82 [2021-10-28 08:42:05,129 INFO L226 Difference]: Without dead ends: 82 [2021-10-28 08:42:05,130 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2021-10-28 08:42:05,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-10-28 08:42:05,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2021-10-28 08:42:05,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 49 states have (on average 1.6122448979591837) internal successors, (79), 74 states have internal predecessors, (79), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-28 08:42:05,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 86 transitions. [2021-10-28 08:42:05,146 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 86 transitions. Word has length 22 [2021-10-28 08:42:05,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 08:42:05,147 INFO L470 AbstractCegarLoop]: Abstraction has 82 states and 86 transitions. [2021-10-28 08:42:05,149 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 4.125) internal successors, (33), 8 states have internal predecessors, (33), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-28 08:42:05,149 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 86 transitions. [2021-10-28 08:42:05,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-10-28 08:42:05,151 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 08:42:05,151 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 08:42:05,200 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-10-28 08:42:05,372 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-10-28 08:42:05,372 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting mainErr1REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-28 08:42:05,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 08:42:05,373 INFO L85 PathProgramCache]: Analyzing trace with hash 668159269, now seen corresponding path program 2 times [2021-10-28 08:42:05,373 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 08:42:05,373 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [437221700] [2021-10-28 08:42:05,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:42:05,373 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 08:42:05,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:05,431 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 08:42:05,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:05,450 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-28 08:42:05,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:05,499 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 08:42:05,500 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 08:42:05,500 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [437221700] [2021-10-28 08:42:05,500 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [437221700] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 08:42:05,503 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [272939853] [2021-10-28 08:42:05,504 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-28 08:42:05,504 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 08:42:05,504 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 [2021-10-28 08:42:05,512 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-28 08:42:05,536 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-10-28 08:42:05,712 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-10-28 08:42:05,713 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-28 08:42:05,714 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 3 conjunts are in the unsatisfiable core [2021-10-28 08:42:05,718 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-28 08:42:05,870 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-10-28 08:42:05,871 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [272939853] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-28 08:42:05,871 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-10-28 08:42:05,871 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2021-10-28 08:42:05,872 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1535508559] [2021-10-28 08:42:05,872 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-28 08:42:05,873 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 08:42:05,873 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-28 08:42:05,874 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-10-28 08:42:05,874 INFO L87 Difference]: Start difference. First operand 82 states and 86 transitions. Second operand has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-10-28 08:42:05,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 08:42:05,897 INFO L93 Difference]: Finished difference Result 85 states and 90 transitions. [2021-10-28 08:42:05,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-28 08:42:05,898 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 29 [2021-10-28 08:42:05,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 08:42:05,900 INFO L225 Difference]: With dead ends: 85 [2021-10-28 08:42:05,900 INFO L226 Difference]: Without dead ends: 85 [2021-10-28 08:42:05,901 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-10-28 08:42:05,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-10-28 08:42:05,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 83. [2021-10-28 08:42:05,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 50 states have (on average 1.6) internal successors, (80), 75 states have internal predecessors, (80), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-28 08:42:05,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 87 transitions. [2021-10-28 08:42:05,912 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 87 transitions. Word has length 29 [2021-10-28 08:42:05,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 08:42:05,913 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 87 transitions. [2021-10-28 08:42:05,913 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-10-28 08:42:05,913 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 87 transitions. [2021-10-28 08:42:05,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-10-28 08:42:05,915 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 08:42:05,915 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 08:42:05,964 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-10-28 08:42:06,128 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-10-28 08:42:06,128 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting dll_remove_lastErr0REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-28 08:42:06,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 08:42:06,129 INFO L85 PathProgramCache]: Analyzing trace with hash -2143918591, now seen corresponding path program 1 times [2021-10-28 08:42:06,129 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 08:42:06,129 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1134490983] [2021-10-28 08:42:06,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:42:06,129 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 08:42:06,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:06,216 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 08:42:06,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:06,234 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-28 08:42:06,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:06,286 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 08:42:06,287 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 08:42:06,287 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1134490983] [2021-10-28 08:42:06,287 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1134490983] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 08:42:06,288 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [371748764] [2021-10-28 08:42:06,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:42:06,288 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 08:42:06,289 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 [2021-10-28 08:42:06,290 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-28 08:42:06,312 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-10-28 08:42:06,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:06,526 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 5 conjunts are in the unsatisfiable core [2021-10-28 08:42:06,531 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-28 08:42:06,653 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 08:42:06,654 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [371748764] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 08:42:06,654 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-28 08:42:06,654 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 4] total 6 [2021-10-28 08:42:06,660 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1352981283] [2021-10-28 08:42:06,662 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-10-28 08:42:06,663 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 08:42:06,664 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-28 08:42:06,664 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-10-28 08:42:06,664 INFO L87 Difference]: Start difference. First operand 83 states and 87 transitions. Second operand has 6 states, 6 states have (on average 4.5) internal successors, (27), 4 states have internal predecessors, (27), 2 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-28 08:42:06,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 08:42:06,936 INFO L93 Difference]: Finished difference Result 83 states and 86 transitions. [2021-10-28 08:42:06,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-10-28 08:42:06,936 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.5) internal successors, (27), 4 states have internal predecessors, (27), 2 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 31 [2021-10-28 08:42:06,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 08:42:06,938 INFO L225 Difference]: With dead ends: 83 [2021-10-28 08:42:06,938 INFO L226 Difference]: Without dead ends: 83 [2021-10-28 08:42:06,938 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-10-28 08:42:06,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-10-28 08:42:06,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2021-10-28 08:42:06,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 50 states have (on average 1.58) internal successors, (79), 75 states have internal predecessors, (79), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-28 08:42:06,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 86 transitions. [2021-10-28 08:42:06,947 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 86 transitions. Word has length 31 [2021-10-28 08:42:06,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 08:42:06,947 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 86 transitions. [2021-10-28 08:42:06,947 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.5) internal successors, (27), 4 states have internal predecessors, (27), 2 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-28 08:42:06,948 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 86 transitions. [2021-10-28 08:42:06,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-10-28 08:42:06,953 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 08:42:06,954 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 08:42:07,001 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-10-28 08:42:07,167 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 08:42:07,167 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting dll_remove_lastErr0REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-28 08:42:07,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 08:42:07,168 INFO L85 PathProgramCache]: Analyzing trace with hash -1187913315, now seen corresponding path program 1 times [2021-10-28 08:42:07,168 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 08:42:07,169 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1700381644] [2021-10-28 08:42:07,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:42:07,169 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 08:42:07,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:07,273 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 08:42:07,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:07,299 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-28 08:42:07,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:07,687 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 08:42:07,687 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 08:42:07,687 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1700381644] [2021-10-28 08:42:07,688 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1700381644] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 08:42:07,688 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [721813913] [2021-10-28 08:42:07,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:42:07,688 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 08:42:07,688 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 [2021-10-28 08:42:07,690 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-28 08:42:07,714 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-10-28 08:42:07,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:07,940 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 14 conjunts are in the unsatisfiable core [2021-10-28 08:42:07,944 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-28 08:42:07,968 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-28 08:42:08,012 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 9 treesize of output 7 [2021-10-28 08:42:08,552 INFO L354 Elim1Store]: treesize reduction 44, result has 20.0 percent of original size [2021-10-28 08:42:08,553 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 24 [2021-10-28 08:42:08,785 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 08:42:08,785 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [721813913] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 08:42:08,786 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-28 08:42:08,786 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 8] total 18 [2021-10-28 08:42:08,789 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1243313505] [2021-10-28 08:42:08,790 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-10-28 08:42:08,790 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 08:42:08,791 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-10-28 08:42:08,792 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=282, Unknown=0, NotChecked=0, Total=342 [2021-10-28 08:42:08,792 INFO L87 Difference]: Start difference. First operand 83 states and 86 transitions. Second operand has 19 states, 17 states have (on average 3.0) internal successors, (51), 15 states have internal predecessors, (51), 4 states have call successors, (7), 6 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-28 08:42:10,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 08:42:10,487 INFO L93 Difference]: Finished difference Result 132 states and 140 transitions. [2021-10-28 08:42:10,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-10-28 08:42:10,488 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 17 states have (on average 3.0) internal successors, (51), 15 states have internal predecessors, (51), 4 states have call successors, (7), 6 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 32 [2021-10-28 08:42:10,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 08:42:10,490 INFO L225 Difference]: With dead ends: 132 [2021-10-28 08:42:10,490 INFO L226 Difference]: Without dead ends: 132 [2021-10-28 08:42:10,491 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=155, Invalid=657, Unknown=0, NotChecked=0, Total=812 [2021-10-28 08:42:10,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-10-28 08:42:10,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 97. [2021-10-28 08:42:10,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 64 states have (on average 1.453125) internal successors, (93), 87 states have internal predecessors, (93), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-10-28 08:42:10,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 103 transitions. [2021-10-28 08:42:10,499 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 103 transitions. Word has length 32 [2021-10-28 08:42:10,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 08:42:10,500 INFO L470 AbstractCegarLoop]: Abstraction has 97 states and 103 transitions. [2021-10-28 08:42:10,500 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 17 states have (on average 3.0) internal successors, (51), 15 states have internal predecessors, (51), 4 states have call successors, (7), 6 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-28 08:42:10,500 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 103 transitions. [2021-10-28 08:42:10,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-10-28 08:42:10,501 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 08:42:10,501 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 08:42:10,553 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-10-28 08:42:10,702 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 08:42:10,702 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting dll_remove_lastErr1REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-28 08:42:10,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 08:42:10,703 INFO L85 PathProgramCache]: Analyzing trace with hash -1187913314, now seen corresponding path program 1 times [2021-10-28 08:42:10,703 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 08:42:10,703 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2020869571] [2021-10-28 08:42:10,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:42:10,703 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 08:42:10,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:10,892 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 08:42:10,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:10,920 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-28 08:42:10,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:11,237 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 08:42:11,238 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 08:42:11,238 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2020869571] [2021-10-28 08:42:11,238 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2020869571] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 08:42:11,238 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1114908683] [2021-10-28 08:42:11,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:42:11,239 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 08:42:11,239 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 [2021-10-28 08:42:11,240 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-28 08:42:11,260 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-10-28 08:42:11,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:11,523 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 19 conjunts are in the unsatisfiable core [2021-10-28 08:42:11,526 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-28 08:42:11,561 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-28 08:42:11,586 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 11 treesize of output 9 [2021-10-28 08:42:12,263 INFO L354 Elim1Store]: treesize reduction 44, result has 20.0 percent of original size [2021-10-28 08:42:12,264 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 25 treesize of output 29 [2021-10-28 08:42:12,498 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 08:42:12,499 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1114908683] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 08:42:12,499 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-28 08:42:12,499 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 8] total 17 [2021-10-28 08:42:12,499 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1897770499] [2021-10-28 08:42:12,500 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-10-28 08:42:12,500 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 08:42:12,501 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-10-28 08:42:12,501 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2021-10-28 08:42:12,501 INFO L87 Difference]: Start difference. First operand 97 states and 103 transitions. Second operand has 18 states, 16 states have (on average 3.125) internal successors, (50), 14 states have internal predecessors, (50), 4 states have call successors, (7), 6 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-10-28 08:42:13,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 08:42:13,928 INFO L93 Difference]: Finished difference Result 142 states and 150 transitions. [2021-10-28 08:42:13,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-10-28 08:42:13,929 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 16 states have (on average 3.125) internal successors, (50), 14 states have internal predecessors, (50), 4 states have call successors, (7), 6 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 32 [2021-10-28 08:42:13,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 08:42:13,930 INFO L225 Difference]: With dead ends: 142 [2021-10-28 08:42:13,931 INFO L226 Difference]: Without dead ends: 142 [2021-10-28 08:42:13,931 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=124, Invalid=526, Unknown=0, NotChecked=0, Total=650 [2021-10-28 08:42:13,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2021-10-28 08:42:13,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 122. [2021-10-28 08:42:13,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 87 states have (on average 1.5517241379310345) internal successors, (135), 110 states have internal predecessors, (135), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-10-28 08:42:13,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 147 transitions. [2021-10-28 08:42:13,946 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 147 transitions. Word has length 32 [2021-10-28 08:42:13,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 08:42:13,946 INFO L470 AbstractCegarLoop]: Abstraction has 122 states and 147 transitions. [2021-10-28 08:42:13,947 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 16 states have (on average 3.125) internal successors, (50), 14 states have internal predecessors, (50), 4 states have call successors, (7), 6 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-10-28 08:42:13,947 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 147 transitions. [2021-10-28 08:42:13,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-10-28 08:42:13,952 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 08:42:13,952 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 08:42:13,998 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-10-28 08:42:14,168 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 08:42:14,168 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting dll_remove_lastErr2REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-28 08:42:14,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 08:42:14,169 INFO L85 PathProgramCache]: Analyzing trace with hash 1829392906, now seen corresponding path program 1 times [2021-10-28 08:42:14,169 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 08:42:14,169 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2017470615] [2021-10-28 08:42:14,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:42:14,169 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 08:42:14,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:14,266 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 08:42:14,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:14,293 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-28 08:42:14,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:14,364 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-10-28 08:42:14,364 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 08:42:14,364 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2017470615] [2021-10-28 08:42:14,365 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2017470615] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-28 08:42:14,365 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-28 08:42:14,365 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-10-28 08:42:14,365 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1111355096] [2021-10-28 08:42:14,366 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-10-28 08:42:14,366 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 08:42:14,367 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-10-28 08:42:14,367 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2021-10-28 08:42:14,368 INFO L87 Difference]: Start difference. First operand 122 states and 147 transitions. Second operand has 12 states, 11 states have (on average 2.272727272727273) internal successors, (25), 8 states have internal predecessors, (25), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-28 08:42:15,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 08:42:15,099 INFO L93 Difference]: Finished difference Result 165 states and 205 transitions. [2021-10-28 08:42:15,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-10-28 08:42:15,100 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.272727272727273) internal successors, (25), 8 states have internal predecessors, (25), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 33 [2021-10-28 08:42:15,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 08:42:15,102 INFO L225 Difference]: With dead ends: 165 [2021-10-28 08:42:15,102 INFO L226 Difference]: Without dead ends: 165 [2021-10-28 08:42:15,103 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=276, Unknown=0, NotChecked=0, Total=342 [2021-10-28 08:42:15,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2021-10-28 08:42:15,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 127. [2021-10-28 08:42:15,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 91 states have (on average 1.5714285714285714) internal successors, (143), 114 states have internal predecessors, (143), 7 states have call successors, (7), 7 states have call predecessors, (7), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-10-28 08:42:15,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 157 transitions. [2021-10-28 08:42:15,112 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 157 transitions. Word has length 33 [2021-10-28 08:42:15,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 08:42:15,113 INFO L470 AbstractCegarLoop]: Abstraction has 127 states and 157 transitions. [2021-10-28 08:42:15,113 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.272727272727273) internal successors, (25), 8 states have internal predecessors, (25), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-28 08:42:15,113 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 157 transitions. [2021-10-28 08:42:15,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-10-28 08:42:15,114 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 08:42:15,115 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 08:42:15,115 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-10-28 08:42:15,115 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting dll_remove_lastErr3REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-28 08:42:15,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 08:42:15,116 INFO L85 PathProgramCache]: Analyzing trace with hash 1829392907, now seen corresponding path program 1 times [2021-10-28 08:42:15,116 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 08:42:15,116 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [372299216] [2021-10-28 08:42:15,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:42:15,117 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 08:42:15,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:15,265 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 08:42:15,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:15,292 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-28 08:42:15,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:15,407 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-28 08:42:15,407 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 08:42:15,407 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [372299216] [2021-10-28 08:42:15,408 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [372299216] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-28 08:42:15,408 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-28 08:42:15,408 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-10-28 08:42:15,408 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2070188297] [2021-10-28 08:42:15,409 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-10-28 08:42:15,409 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 08:42:15,410 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-10-28 08:42:15,410 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2021-10-28 08:42:15,411 INFO L87 Difference]: Start difference. First operand 127 states and 157 transitions. Second operand has 12 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-28 08:42:16,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 08:42:16,152 INFO L93 Difference]: Finished difference Result 168 states and 208 transitions. [2021-10-28 08:42:16,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-10-28 08:42:16,153 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 33 [2021-10-28 08:42:16,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 08:42:16,155 INFO L225 Difference]: With dead ends: 168 [2021-10-28 08:42:16,155 INFO L226 Difference]: Without dead ends: 168 [2021-10-28 08:42:16,156 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=65, Invalid=277, Unknown=0, NotChecked=0, Total=342 [2021-10-28 08:42:16,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-10-28 08:42:16,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 127. [2021-10-28 08:42:16,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 91 states have (on average 1.5494505494505495) internal successors, (141), 114 states have internal predecessors, (141), 7 states have call successors, (7), 7 states have call predecessors, (7), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-10-28 08:42:16,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 155 transitions. [2021-10-28 08:42:16,166 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 155 transitions. Word has length 33 [2021-10-28 08:42:16,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 08:42:16,166 INFO L470 AbstractCegarLoop]: Abstraction has 127 states and 155 transitions. [2021-10-28 08:42:16,166 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-28 08:42:16,167 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 155 transitions. [2021-10-28 08:42:16,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-10-28 08:42:16,168 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 08:42:16,168 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 08:42:16,168 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-10-28 08:42:16,169 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting dll_remove_lastErr6ASSERT_VIOLATIONMEMORY_FREE === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-28 08:42:16,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 08:42:16,170 INFO L85 PathProgramCache]: Analyzing trace with hash 604055652, now seen corresponding path program 1 times [2021-10-28 08:42:16,170 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 08:42:16,170 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [156620856] [2021-10-28 08:42:16,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:42:16,171 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 08:42:16,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:16,275 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 08:42:16,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:16,305 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-28 08:42:16,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:16,382 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-28 08:42:16,383 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 08:42:16,383 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [156620856] [2021-10-28 08:42:16,383 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [156620856] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-28 08:42:16,384 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-28 08:42:16,384 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-10-28 08:42:16,384 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1150476031] [2021-10-28 08:42:16,385 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-10-28 08:42:16,385 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 08:42:16,385 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-10-28 08:42:16,386 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2021-10-28 08:42:16,386 INFO L87 Difference]: Start difference. First operand 127 states and 155 transitions. Second operand has 12 states, 11 states have (on average 2.727272727272727) internal successors, (30), 8 states have internal predecessors, (30), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-28 08:42:17,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 08:42:17,020 INFO L93 Difference]: Finished difference Result 126 states and 153 transitions. [2021-10-28 08:42:17,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-10-28 08:42:17,021 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.727272727272727) internal successors, (30), 8 states have internal predecessors, (30), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 36 [2021-10-28 08:42:17,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 08:42:17,023 INFO L225 Difference]: With dead ends: 126 [2021-10-28 08:42:17,023 INFO L226 Difference]: Without dead ends: 126 [2021-10-28 08:42:17,024 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2021-10-28 08:42:17,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-10-28 08:42:17,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 126. [2021-10-28 08:42:17,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 91 states have (on average 1.5274725274725274) internal successors, (139), 113 states have internal predecessors, (139), 7 states have call successors, (7), 7 states have call predecessors, (7), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-10-28 08:42:17,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 153 transitions. [2021-10-28 08:42:17,032 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 153 transitions. Word has length 36 [2021-10-28 08:42:17,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 08:42:17,032 INFO L470 AbstractCegarLoop]: Abstraction has 126 states and 153 transitions. [2021-10-28 08:42:17,033 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.727272727272727) internal successors, (30), 8 states have internal predecessors, (30), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-28 08:42:17,033 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 153 transitions. [2021-10-28 08:42:17,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-10-28 08:42:17,034 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 08:42:17,034 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 08:42:17,034 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-10-28 08:42:17,035 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting dll_remove_lastErr13REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-28 08:42:17,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 08:42:17,036 INFO L85 PathProgramCache]: Analyzing trace with hash 1546287056, now seen corresponding path program 1 times [2021-10-28 08:42:17,036 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 08:42:17,036 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2125688599] [2021-10-28 08:42:17,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:42:17,036 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 08:42:17,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:17,126 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 08:42:17,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:17,151 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-28 08:42:17,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:17,165 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-10-28 08:42:17,165 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 08:42:17,166 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2125688599] [2021-10-28 08:42:17,166 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2125688599] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-28 08:42:17,166 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-28 08:42:17,166 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-10-28 08:42:17,167 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1099836548] [2021-10-28 08:42:17,167 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-10-28 08:42:17,167 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 08:42:17,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-10-28 08:42:17,168 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-10-28 08:42:17,169 INFO L87 Difference]: Start difference. First operand 126 states and 153 transitions. Second operand has 8 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 1 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-28 08:42:17,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 08:42:17,626 INFO L93 Difference]: Finished difference Result 127 states and 153 transitions. [2021-10-28 08:42:17,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-10-28 08:42:17,627 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 1 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 37 [2021-10-28 08:42:17,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 08:42:17,629 INFO L225 Difference]: With dead ends: 127 [2021-10-28 08:42:17,629 INFO L226 Difference]: Without dead ends: 127 [2021-10-28 08:42:17,629 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2021-10-28 08:42:17,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-10-28 08:42:17,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 126. [2021-10-28 08:42:17,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 93 states have (on average 1.4946236559139785) internal successors, (139), 113 states have internal predecessors, (139), 7 states have call successors, (7), 7 states have call predecessors, (7), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-10-28 08:42:17,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 153 transitions. [2021-10-28 08:42:17,641 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 153 transitions. Word has length 37 [2021-10-28 08:42:17,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 08:42:17,643 INFO L470 AbstractCegarLoop]: Abstraction has 126 states and 153 transitions. [2021-10-28 08:42:17,643 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 1 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-28 08:42:17,643 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 153 transitions. [2021-10-28 08:42:17,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-10-28 08:42:17,646 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 08:42:17,646 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 08:42:17,646 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-10-28 08:42:17,647 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting dll_remove_lastErr14REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-28 08:42:17,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 08:42:17,647 INFO L85 PathProgramCache]: Analyzing trace with hash 1546287057, now seen corresponding path program 1 times [2021-10-28 08:42:17,647 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 08:42:17,648 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [835641679] [2021-10-28 08:42:17,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:42:17,648 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 08:42:17,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:17,868 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 08:42:17,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:17,892 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-28 08:42:17,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:17,987 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-28 08:42:17,987 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 08:42:17,988 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [835641679] [2021-10-28 08:42:17,988 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [835641679] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-28 08:42:17,988 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-28 08:42:17,988 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-10-28 08:42:17,989 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1630975603] [2021-10-28 08:42:17,989 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-10-28 08:42:17,989 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 08:42:17,990 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-10-28 08:42:17,991 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=156, Unknown=0, NotChecked=0, Total=182 [2021-10-28 08:42:17,991 INFO L87 Difference]: Start difference. First operand 126 states and 153 transitions. Second operand has 14 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 10 states have internal predecessors, (31), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-28 08:42:18,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 08:42:18,949 INFO L93 Difference]: Finished difference Result 188 states and 230 transitions. [2021-10-28 08:42:18,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-10-28 08:42:18,950 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 10 states have internal predecessors, (31), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 37 [2021-10-28 08:42:18,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 08:42:18,952 INFO L225 Difference]: With dead ends: 188 [2021-10-28 08:42:18,953 INFO L226 Difference]: Without dead ends: 188 [2021-10-28 08:42:18,953 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=97, Invalid=455, Unknown=0, NotChecked=0, Total=552 [2021-10-28 08:42:18,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2021-10-28 08:42:18,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 150. [2021-10-28 08:42:18,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 115 states have (on average 1.4956521739130435) internal successors, (172), 137 states have internal predecessors, (172), 7 states have call successors, (7), 7 states have call predecessors, (7), 7 states have return successors, (9), 5 states have call predecessors, (9), 6 states have call successors, (9) [2021-10-28 08:42:18,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 188 transitions. [2021-10-28 08:42:18,964 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 188 transitions. Word has length 37 [2021-10-28 08:42:18,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 08:42:18,964 INFO L470 AbstractCegarLoop]: Abstraction has 150 states and 188 transitions. [2021-10-28 08:42:18,965 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 10 states have internal predecessors, (31), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-28 08:42:18,965 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 188 transitions. [2021-10-28 08:42:18,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-10-28 08:42:18,966 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 08:42:18,966 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 08:42:18,966 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-10-28 08:42:18,967 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting dll_remove_lastErr7ASSERT_VIOLATIONMEMORY_FREE === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-28 08:42:18,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 08:42:18,967 INFO L85 PathProgramCache]: Analyzing trace with hash 1545856107, now seen corresponding path program 1 times [2021-10-28 08:42:18,968 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 08:42:18,968 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2113562826] [2021-10-28 08:42:18,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:42:18,968 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 08:42:18,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:19,069 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 08:42:19,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:19,094 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-28 08:42:19,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:19,161 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-28 08:42:19,162 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 08:42:19,162 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2113562826] [2021-10-28 08:42:19,162 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2113562826] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-28 08:42:19,163 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-28 08:42:19,163 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-10-28 08:42:19,163 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [456880986] [2021-10-28 08:42:19,164 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-10-28 08:42:19,164 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 08:42:19,164 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-10-28 08:42:19,165 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2021-10-28 08:42:19,165 INFO L87 Difference]: Start difference. First operand 150 states and 188 transitions. Second operand has 12 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 8 states have internal predecessors, (31), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-28 08:42:19,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 08:42:19,899 INFO L93 Difference]: Finished difference Result 182 states and 226 transitions. [2021-10-28 08:42:19,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-10-28 08:42:19,901 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 8 states have internal predecessors, (31), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 37 [2021-10-28 08:42:19,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 08:42:19,903 INFO L225 Difference]: With dead ends: 182 [2021-10-28 08:42:19,903 INFO L226 Difference]: Without dead ends: 182 [2021-10-28 08:42:19,904 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=72, Invalid=308, Unknown=0, NotChecked=0, Total=380 [2021-10-28 08:42:19,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2021-10-28 08:42:19,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 156. [2021-10-28 08:42:19,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 121 states have (on average 1.4793388429752066) internal successors, (179), 143 states have internal predecessors, (179), 7 states have call successors, (7), 7 states have call predecessors, (7), 7 states have return successors, (9), 5 states have call predecessors, (9), 6 states have call successors, (9) [2021-10-28 08:42:19,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 195 transitions. [2021-10-28 08:42:19,942 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 195 transitions. Word has length 37 [2021-10-28 08:42:19,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 08:42:19,943 INFO L470 AbstractCegarLoop]: Abstraction has 156 states and 195 transitions. [2021-10-28 08:42:19,943 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 8 states have internal predecessors, (31), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-28 08:42:19,943 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 195 transitions. [2021-10-28 08:42:19,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-10-28 08:42:19,944 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 08:42:19,944 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 08:42:19,945 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-10-28 08:42:19,945 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting dll_remove_lastErr8ASSERT_VIOLATIONMEMORY_FREE === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-28 08:42:19,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 08:42:19,946 INFO L85 PathProgramCache]: Analyzing trace with hash 676899142, now seen corresponding path program 1 times [2021-10-28 08:42:19,946 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 08:42:19,946 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [310481702] [2021-10-28 08:42:19,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:42:19,947 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 08:42:19,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:20,041 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 08:42:20,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:20,061 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-28 08:42:20,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:20,074 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-10-28 08:42:20,075 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 08:42:20,075 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [310481702] [2021-10-28 08:42:20,075 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [310481702] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-28 08:42:20,076 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-28 08:42:20,076 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-10-28 08:42:20,076 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [810720142] [2021-10-28 08:42:20,077 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-10-28 08:42:20,077 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 08:42:20,077 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-10-28 08:42:20,078 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-10-28 08:42:20,078 INFO L87 Difference]: Start difference. First operand 156 states and 195 transitions. Second operand has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 1 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-28 08:42:20,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 08:42:20,424 INFO L93 Difference]: Finished difference Result 155 states and 193 transitions. [2021-10-28 08:42:20,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-10-28 08:42:20,425 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 1 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 38 [2021-10-28 08:42:20,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 08:42:20,427 INFO L225 Difference]: With dead ends: 155 [2021-10-28 08:42:20,427 INFO L226 Difference]: Without dead ends: 155 [2021-10-28 08:42:20,428 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=44, Invalid=88, Unknown=0, NotChecked=0, Total=132 [2021-10-28 08:42:20,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-10-28 08:42:20,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 155. [2021-10-28 08:42:20,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 121 states have (on average 1.462809917355372) internal successors, (177), 142 states have internal predecessors, (177), 7 states have call successors, (7), 7 states have call predecessors, (7), 7 states have return successors, (9), 5 states have call predecessors, (9), 6 states have call successors, (9) [2021-10-28 08:42:20,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 193 transitions. [2021-10-28 08:42:20,445 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 193 transitions. Word has length 38 [2021-10-28 08:42:20,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 08:42:20,446 INFO L470 AbstractCegarLoop]: Abstraction has 155 states and 193 transitions. [2021-10-28 08:42:20,446 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 1 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-28 08:42:20,447 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 193 transitions. [2021-10-28 08:42:20,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-10-28 08:42:20,447 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 08:42:20,448 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 08:42:20,448 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-10-28 08:42:20,448 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting dll_remove_lastErr17REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-28 08:42:20,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 08:42:20,451 INFO L85 PathProgramCache]: Analyzing trace with hash -76822310, now seen corresponding path program 1 times [2021-10-28 08:42:20,452 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 08:42:20,452 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [607376031] [2021-10-28 08:42:20,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:42:20,452 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 08:42:20,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:20,718 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 08:42:20,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:20,755 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-28 08:42:20,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:20,827 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-28 08:42:20,828 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 08:42:20,828 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [607376031] [2021-10-28 08:42:20,828 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [607376031] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-28 08:42:20,828 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-28 08:42:20,829 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-10-28 08:42:20,829 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2099635106] [2021-10-28 08:42:20,829 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-10-28 08:42:20,830 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 08:42:20,830 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-10-28 08:42:20,831 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=238, Unknown=0, NotChecked=0, Total=272 [2021-10-28 08:42:20,831 INFO L87 Difference]: Start difference. First operand 155 states and 193 transitions. Second operand has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 13 states have internal predecessors, (33), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-28 08:42:21,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 08:42:21,912 INFO L93 Difference]: Finished difference Result 151 states and 181 transitions. [2021-10-28 08:42:21,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-10-28 08:42:21,913 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 13 states have internal predecessors, (33), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 39 [2021-10-28 08:42:21,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 08:42:21,914 INFO L225 Difference]: With dead ends: 151 [2021-10-28 08:42:21,914 INFO L226 Difference]: Without dead ends: 151 [2021-10-28 08:42:21,915 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 113 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=162, Invalid=768, Unknown=0, NotChecked=0, Total=930 [2021-10-28 08:42:21,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2021-10-28 08:42:21,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 145. [2021-10-28 08:42:21,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 113 states have (on average 1.424778761061947) internal successors, (161), 132 states have internal predecessors, (161), 7 states have call successors, (7), 7 states have call predecessors, (7), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-10-28 08:42:21,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 175 transitions. [2021-10-28 08:42:21,924 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 175 transitions. Word has length 39 [2021-10-28 08:42:21,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 08:42:21,924 INFO L470 AbstractCegarLoop]: Abstraction has 145 states and 175 transitions. [2021-10-28 08:42:21,924 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 13 states have internal predecessors, (33), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-28 08:42:21,925 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 175 transitions. [2021-10-28 08:42:21,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-10-28 08:42:21,926 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 08:42:21,926 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 08:42:21,926 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-10-28 08:42:21,926 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting dll_remove_lastErr9REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-28 08:42:21,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 08:42:21,927 INFO L85 PathProgramCache]: Analyzing trace with hash -490962994, now seen corresponding path program 1 times [2021-10-28 08:42:21,927 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 08:42:21,928 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [421008247] [2021-10-28 08:42:21,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:42:21,928 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 08:42:21,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:22,113 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 08:42:22,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:22,154 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-28 08:42:22,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:22,242 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-28 08:42:22,243 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 08:42:22,243 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [421008247] [2021-10-28 08:42:22,243 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [421008247] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-28 08:42:22,243 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-28 08:42:22,244 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-10-28 08:42:22,244 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1167185500] [2021-10-28 08:42:22,244 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-10-28 08:42:22,245 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 08:42:22,245 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-10-28 08:42:22,246 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2021-10-28 08:42:22,246 INFO L87 Difference]: Start difference. First operand 145 states and 175 transitions. Second operand has 15 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 11 states have internal predecessors, (33), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-10-28 08:42:23,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 08:42:23,110 INFO L93 Difference]: Finished difference Result 173 states and 208 transitions. [2021-10-28 08:42:23,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-10-28 08:42:23,111 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 11 states have internal predecessors, (33), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 39 [2021-10-28 08:42:23,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 08:42:23,113 INFO L225 Difference]: With dead ends: 173 [2021-10-28 08:42:23,113 INFO L226 Difference]: Without dead ends: 173 [2021-10-28 08:42:23,114 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=113, Invalid=589, Unknown=0, NotChecked=0, Total=702 [2021-10-28 08:42:23,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2021-10-28 08:42:23,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 149. [2021-10-28 08:42:23,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 117 states have (on average 1.4188034188034189) internal successors, (166), 136 states have internal predecessors, (166), 7 states have call successors, (7), 7 states have call predecessors, (7), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-10-28 08:42:23,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 180 transitions. [2021-10-28 08:42:23,122 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 180 transitions. Word has length 39 [2021-10-28 08:42:23,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 08:42:23,123 INFO L470 AbstractCegarLoop]: Abstraction has 149 states and 180 transitions. [2021-10-28 08:42:23,123 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 11 states have internal predecessors, (33), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-10-28 08:42:23,123 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 180 transitions. [2021-10-28 08:42:23,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-10-28 08:42:23,124 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 08:42:23,124 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 08:42:23,125 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-10-28 08:42:23,125 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting dll_remove_lastErr0REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-28 08:42:23,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 08:42:23,126 INFO L85 PathProgramCache]: Analyzing trace with hash -2016451191, now seen corresponding path program 2 times [2021-10-28 08:42:23,126 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 08:42:23,126 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [915405083] [2021-10-28 08:42:23,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:42:23,127 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 08:42:23,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:23,197 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 08:42:23,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:23,215 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-28 08:42:23,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:23,280 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 1 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 08:42:23,281 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 08:42:23,281 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [915405083] [2021-10-28 08:42:23,281 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [915405083] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 08:42:23,281 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [79244737] [2021-10-28 08:42:23,282 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-28 08:42:23,282 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 08:42:23,282 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 [2021-10-28 08:42:23,288 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-28 08:42:23,311 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-10-28 08:42:23,595 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-28 08:42:23,596 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-28 08:42:23,598 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-28 08:42:23,608 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-28 08:42:23,780 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 9 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 08:42:23,780 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [79244737] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 08:42:23,781 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-28 08:42:23,781 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 11 [2021-10-28 08:42:23,781 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1650945516] [2021-10-28 08:42:23,782 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-10-28 08:42:23,782 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 08:42:23,783 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-10-28 08:42:23,783 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2021-10-28 08:42:23,783 INFO L87 Difference]: Start difference. First operand 149 states and 180 transitions. Second operand has 11 states, 9 states have (on average 4.888888888888889) internal successors, (44), 9 states have internal predecessors, (44), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-28 08:42:24,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 08:42:24,126 INFO L93 Difference]: Finished difference Result 100 states and 106 transitions. [2021-10-28 08:42:24,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-10-28 08:42:24,127 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 9 states have (on average 4.888888888888889) internal successors, (44), 9 states have internal predecessors, (44), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 40 [2021-10-28 08:42:24,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 08:42:24,128 INFO L225 Difference]: With dead ends: 100 [2021-10-28 08:42:24,128 INFO L226 Difference]: Without dead ends: 89 [2021-10-28 08:42:24,128 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2021-10-28 08:42:24,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-10-28 08:42:24,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2021-10-28 08:42:24,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 66 states have (on average 1.2878787878787878) internal successors, (85), 80 states have internal predecessors, (85), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-10-28 08:42:24,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 94 transitions. [2021-10-28 08:42:24,131 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 94 transitions. Word has length 40 [2021-10-28 08:42:24,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 08:42:24,131 INFO L470 AbstractCegarLoop]: Abstraction has 89 states and 94 transitions. [2021-10-28 08:42:24,132 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 9 states have (on average 4.888888888888889) internal successors, (44), 9 states have internal predecessors, (44), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-28 08:42:24,132 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 94 transitions. [2021-10-28 08:42:24,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-10-28 08:42:24,132 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 08:42:24,132 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 08:42:24,167 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-10-28 08:42:24,333 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 08:42:24,333 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting dll_remove_lastErr13REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-28 08:42:24,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 08:42:24,334 INFO L85 PathProgramCache]: Analyzing trace with hash -811741562, now seen corresponding path program 1 times [2021-10-28 08:42:24,334 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 08:42:24,334 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1470306433] [2021-10-28 08:42:24,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:42:24,334 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 08:42:24,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:24,580 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 08:42:24,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:24,608 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-28 08:42:24,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:24,872 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 08:42:24,873 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 08:42:24,873 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1470306433] [2021-10-28 08:42:24,873 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1470306433] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 08:42:24,873 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1415659183] [2021-10-28 08:42:24,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:42:24,874 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 08:42:24,874 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 [2021-10-28 08:42:24,880 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-28 08:42:24,882 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-10-28 08:42:25,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:25,263 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 61 conjunts are in the unsatisfiable core [2021-10-28 08:42:25,266 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-28 08:42:25,352 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-28 08:42:25,401 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-10-28 08:42:25,402 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 11 treesize of output 11 [2021-10-28 08:42:25,432 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-10-28 08:42:25,475 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 23 [2021-10-28 08:42:25,478 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-28 08:42:25,492 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-28 08:42:25,494 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 0 case distinctions, treesize of input 18 treesize of output 22 [2021-10-28 08:42:25,579 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-28 08:42:25,600 INFO L354 Elim1Store]: treesize reduction 68, result has 21.8 percent of original size [2021-10-28 08:42:25,601 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 56 treesize of output 43 [2021-10-28 08:42:26,491 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 83 treesize of output 75 [2021-10-28 08:42:26,797 INFO L354 Elim1Store]: treesize reduction 42, result has 2.3 percent of original size [2021-10-28 08:42:26,797 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 6 case distinctions, treesize of input 73 treesize of output 25 [2021-10-28 08:42:26,814 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 08:42:26,815 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1415659183] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 08:42:26,815 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-28 08:42:26,815 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 30 [2021-10-28 08:42:26,816 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [735812119] [2021-10-28 08:42:26,819 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-10-28 08:42:26,820 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 08:42:26,821 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-10-28 08:42:26,821 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=856, Unknown=0, NotChecked=0, Total=930 [2021-10-28 08:42:26,822 INFO L87 Difference]: Start difference. First operand 89 states and 94 transitions. Second operand has 31 states, 29 states have (on average 2.0344827586206895) internal successors, (59), 25 states have internal predecessors, (59), 4 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-10-28 08:42:29,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 08:42:29,141 INFO L93 Difference]: Finished difference Result 102 states and 108 transitions. [2021-10-28 08:42:29,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-10-28 08:42:29,144 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 29 states have (on average 2.0344827586206895) internal successors, (59), 25 states have internal predecessors, (59), 4 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 41 [2021-10-28 08:42:29,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 08:42:29,146 INFO L225 Difference]: With dead ends: 102 [2021-10-28 08:42:29,146 INFO L226 Difference]: Without dead ends: 102 [2021-10-28 08:42:29,147 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 375 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=260, Invalid=2092, Unknown=0, NotChecked=0, Total=2352 [2021-10-28 08:42:29,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2021-10-28 08:42:29,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 91. [2021-10-28 08:42:29,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 68 states have (on average 1.2941176470588236) internal successors, (88), 82 states have internal predecessors, (88), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-10-28 08:42:29,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 97 transitions. [2021-10-28 08:42:29,152 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 97 transitions. Word has length 41 [2021-10-28 08:42:29,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 08:42:29,153 INFO L470 AbstractCegarLoop]: Abstraction has 91 states and 97 transitions. [2021-10-28 08:42:29,153 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 29 states have (on average 2.0344827586206895) internal successors, (59), 25 states have internal predecessors, (59), 4 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-10-28 08:42:29,154 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 97 transitions. [2021-10-28 08:42:29,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-10-28 08:42:29,154 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 08:42:29,155 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 08:42:29,201 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-10-28 08:42:29,376 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-10-28 08:42:29,376 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting dll_remove_lastErr14REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-28 08:42:29,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 08:42:29,377 INFO L85 PathProgramCache]: Analyzing trace with hash -811741561, now seen corresponding path program 1 times [2021-10-28 08:42:29,377 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 08:42:29,377 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2076343349] [2021-10-28 08:42:29,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:42:29,377 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 08:42:29,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:29,697 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 08:42:29,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:29,731 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-28 08:42:29,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:30,135 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 08:42:30,135 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 08:42:30,136 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2076343349] [2021-10-28 08:42:30,136 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2076343349] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 08:42:30,136 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [165077013] [2021-10-28 08:42:30,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:42:30,136 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 08:42:30,136 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 [2021-10-28 08:42:30,144 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-28 08:42:30,157 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-10-28 08:42:30,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:30,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 76 conjunts are in the unsatisfiable core [2021-10-28 08:42:30,543 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-28 08:42:30,638 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-28 08:42:30,784 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-10-28 08:42:30,785 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 11 treesize of output 11 [2021-10-28 08:42:30,869 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-10-28 08:42:30,878 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-10-28 08:42:30,974 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-28 08:42:30,976 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-10-28 08:42:30,996 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-28 08:42:30,998 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-10-28 08:42:31,128 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-28 08:42:31,129 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-28 08:42:31,142 INFO L354 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2021-10-28 08:42:31,142 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 95 treesize of output 70 [2021-10-28 08:42:31,148 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-28 08:42:31,149 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-28 08:42:31,160 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-10-28 08:42:31,161 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 85 treesize of output 81 [2021-10-28 08:42:33,096 INFO L354 Elim1Store]: treesize reduction 65, result has 11.0 percent of original size [2021-10-28 08:42:33,096 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 7 new quantified variables, introduced 10 case distinctions, treesize of input 140 treesize of output 73 [2021-10-28 08:42:33,115 INFO L354 Elim1Store]: treesize reduction 46, result has 6.1 percent of original size [2021-10-28 08:42:33,115 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 6 new quantified variables, introduced 10 case distinctions, treesize of input 55 treesize of output 37 [2021-10-28 08:42:33,274 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 08:42:33,274 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [165077013] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 08:42:33,274 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-28 08:42:33,274 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 41 [2021-10-28 08:42:33,275 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1642896062] [2021-10-28 08:42:33,275 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-10-28 08:42:33,276 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 08:42:33,276 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-10-28 08:42:33,277 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1626, Unknown=0, NotChecked=0, Total=1722 [2021-10-28 08:42:33,277 INFO L87 Difference]: Start difference. First operand 91 states and 97 transitions. Second operand has 42 states, 40 states have (on average 1.725) internal successors, (69), 36 states have internal predecessors, (69), 4 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-10-28 08:42:38,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 08:42:38,764 INFO L93 Difference]: Finished difference Result 113 states and 120 transitions. [2021-10-28 08:42:38,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-10-28 08:42:38,765 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 40 states have (on average 1.725) internal successors, (69), 36 states have internal predecessors, (69), 4 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 41 [2021-10-28 08:42:38,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 08:42:38,766 INFO L225 Difference]: With dead ends: 113 [2021-10-28 08:42:38,766 INFO L226 Difference]: Without dead ends: 113 [2021-10-28 08:42:38,768 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 592 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=346, Invalid=3686, Unknown=0, NotChecked=0, Total=4032 [2021-10-28 08:42:38,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-10-28 08:42:38,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 99. [2021-10-28 08:42:38,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 75 states have (on average 1.3066666666666666) internal successors, (98), 90 states have internal predecessors, (98), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-10-28 08:42:38,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 108 transitions. [2021-10-28 08:42:38,774 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 108 transitions. Word has length 41 [2021-10-28 08:42:38,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 08:42:38,775 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 108 transitions. [2021-10-28 08:42:38,775 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 40 states have (on average 1.725) internal successors, (69), 36 states have internal predecessors, (69), 4 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-10-28 08:42:38,775 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 108 transitions. [2021-10-28 08:42:38,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-10-28 08:42:38,776 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 08:42:38,776 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 08:42:38,808 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-10-28 08:42:38,988 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 08:42:38,988 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting dll_remove_lastErr17REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-28 08:42:38,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 08:42:38,989 INFO L85 PathProgramCache]: Analyzing trace with hash 1600408080, now seen corresponding path program 1 times [2021-10-28 08:42:38,989 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 08:42:38,989 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1558527983] [2021-10-28 08:42:38,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:42:38,989 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 08:42:39,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:39,081 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 08:42:39,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:39,101 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-28 08:42:39,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:39,113 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-10-28 08:42:39,113 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 08:42:39,113 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1558527983] [2021-10-28 08:42:39,114 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1558527983] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 08:42:39,114 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [657284926] [2021-10-28 08:42:39,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:42:39,114 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 08:42:39,115 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 [2021-10-28 08:42:39,116 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-28 08:42:39,143 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-10-28 08:42:39,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:39,577 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 9 conjunts are in the unsatisfiable core [2021-10-28 08:42:39,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-28 08:42:39,707 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 7 treesize of output 3 [2021-10-28 08:42:39,734 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-10-28 08:42:39,734 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [657284926] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 08:42:39,734 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-28 08:42:39,735 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 3] total 8 [2021-10-28 08:42:39,735 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2037302542] [2021-10-28 08:42:39,736 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-10-28 08:42:39,736 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 08:42:39,736 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-10-28 08:42:39,737 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-10-28 08:42:39,737 INFO L87 Difference]: Start difference. First operand 99 states and 108 transitions. Second operand has 9 states, 8 states have (on average 4.875) internal successors, (39), 7 states have internal predecessors, (39), 1 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-28 08:42:40,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 08:42:40,294 INFO L93 Difference]: Finished difference Result 99 states and 106 transitions. [2021-10-28 08:42:40,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-10-28 08:42:40,295 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 4.875) internal successors, (39), 7 states have internal predecessors, (39), 1 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 43 [2021-10-28 08:42:40,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 08:42:40,296 INFO L225 Difference]: With dead ends: 99 [2021-10-28 08:42:40,296 INFO L226 Difference]: Without dead ends: 99 [2021-10-28 08:42:40,296 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=81, Invalid=225, Unknown=0, NotChecked=0, Total=306 [2021-10-28 08:42:40,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-10-28 08:42:40,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 98. [2021-10-28 08:42:40,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 75 states have (on average 1.28) internal successors, (96), 89 states have internal predecessors, (96), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-10-28 08:42:40,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 106 transitions. [2021-10-28 08:42:40,301 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 106 transitions. Word has length 43 [2021-10-28 08:42:40,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 08:42:40,301 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 106 transitions. [2021-10-28 08:42:40,302 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 4.875) internal successors, (39), 7 states have internal predecessors, (39), 1 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-28 08:42:40,302 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 106 transitions. [2021-10-28 08:42:40,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-10-28 08:42:40,303 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 08:42:40,303 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 08:42:40,355 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-10-28 08:42:40,528 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-10-28 08:42:40,528 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting dll_remove_lastErr18REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-28 08:42:40,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 08:42:40,528 INFO L85 PathProgramCache]: Analyzing trace with hash 1600408081, now seen corresponding path program 1 times [2021-10-28 08:42:40,529 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 08:42:40,529 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [877918942] [2021-10-28 08:42:40,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:42:40,529 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 08:42:40,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:40,813 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 08:42:40,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:40,843 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-28 08:42:40,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:40,940 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-28 08:42:40,940 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 08:42:40,940 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [877918942] [2021-10-28 08:42:40,941 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [877918942] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 08:42:40,941 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1292069667] [2021-10-28 08:42:40,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:42:40,941 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 08:42:40,941 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 [2021-10-28 08:42:40,944 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-28 08:42:40,968 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-10-28 08:42:41,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:41,406 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 11 conjunts are in the unsatisfiable core [2021-10-28 08:42:41,408 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-28 08:42:41,521 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 7 treesize of output 3 [2021-10-28 08:42:41,645 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-10-28 08:42:41,645 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1292069667] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 08:42:41,645 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-28 08:42:41,646 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 3] total 17 [2021-10-28 08:42:41,646 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1386014256] [2021-10-28 08:42:41,646 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-10-28 08:42:41,647 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 08:42:41,647 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-10-28 08:42:41,648 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=268, Unknown=0, NotChecked=0, Total=306 [2021-10-28 08:42:41,648 INFO L87 Difference]: Start difference. First operand 98 states and 106 transitions. Second operand has 18 states, 17 states have (on average 3.4705882352941178) internal successors, (59), 14 states have internal predecessors, (59), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-10-28 08:42:43,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 08:42:43,335 INFO L93 Difference]: Finished difference Result 107 states and 114 transitions. [2021-10-28 08:42:43,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-10-28 08:42:43,336 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 3.4705882352941178) internal successors, (59), 14 states have internal predecessors, (59), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 43 [2021-10-28 08:42:43,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 08:42:43,337 INFO L225 Difference]: With dead ends: 107 [2021-10-28 08:42:43,337 INFO L226 Difference]: Without dead ends: 107 [2021-10-28 08:42:43,338 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 212 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=248, Invalid=1234, Unknown=0, NotChecked=0, Total=1482 [2021-10-28 08:42:43,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-10-28 08:42:43,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 95. [2021-10-28 08:42:43,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 74 states have (on average 1.2432432432432432) internal successors, (92), 86 states have internal predecessors, (92), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-10-28 08:42:43,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 102 transitions. [2021-10-28 08:42:43,346 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 102 transitions. Word has length 43 [2021-10-28 08:42:43,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 08:42:43,346 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 102 transitions. [2021-10-28 08:42:43,346 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 3.4705882352941178) internal successors, (59), 14 states have internal predecessors, (59), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-10-28 08:42:43,347 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 102 transitions. [2021-10-28 08:42:43,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-10-28 08:42:43,348 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 08:42:43,348 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 08:42:43,392 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-10-28 08:42:43,548 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-10-28 08:42:43,549 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting mainErr0REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-28 08:42:43,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 08:42:43,549 INFO L85 PathProgramCache]: Analyzing trace with hash -1924081036, now seen corresponding path program 1 times [2021-10-28 08:42:43,549 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 08:42:43,549 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1208168342] [2021-10-28 08:42:43,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:42:43,550 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 08:42:43,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:43,600 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 08:42:43,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:43,616 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-28 08:42:43,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:43,638 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-10-28 08:42:43,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:43,670 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-10-28 08:42:43,671 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 08:42:43,671 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1208168342] [2021-10-28 08:42:43,671 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1208168342] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-28 08:42:43,671 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-28 08:42:43,672 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-10-28 08:42:43,672 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1176210184] [2021-10-28 08:42:43,672 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-10-28 08:42:43,672 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 08:42:43,673 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-10-28 08:42:43,673 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-10-28 08:42:43,674 INFO L87 Difference]: Start difference. First operand 95 states and 102 transitions. Second operand has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 5 states have internal predecessors, (31), 1 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-10-28 08:42:43,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 08:42:43,941 INFO L93 Difference]: Finished difference Result 103 states and 114 transitions. [2021-10-28 08:42:43,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-10-28 08:42:43,942 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 5 states have internal predecessors, (31), 1 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 44 [2021-10-28 08:42:43,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 08:42:43,943 INFO L225 Difference]: With dead ends: 103 [2021-10-28 08:42:43,943 INFO L226 Difference]: Without dead ends: 103 [2021-10-28 08:42:43,944 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2021-10-28 08:42:43,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-10-28 08:42:43,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2021-10-28 08:42:43,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 80 states have (on average 1.2375) internal successors, (99), 92 states have internal predecessors, (99), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (9), 4 states have call predecessors, (9), 5 states have call successors, (9) [2021-10-28 08:42:43,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 114 transitions. [2021-10-28 08:42:43,949 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 114 transitions. Word has length 44 [2021-10-28 08:42:43,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 08:42:43,949 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 114 transitions. [2021-10-28 08:42:43,949 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 5 states have internal predecessors, (31), 1 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-10-28 08:42:43,950 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 114 transitions. [2021-10-28 08:42:43,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-10-28 08:42:43,950 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 08:42:43,951 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 08:42:43,951 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-10-28 08:42:43,951 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting dll_remove_lastErr20ASSERT_VIOLATIONMEMORY_FREE === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-28 08:42:43,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 08:42:43,952 INFO L85 PathProgramCache]: Analyzing trace with hash 393874640, now seen corresponding path program 1 times [2021-10-28 08:42:43,952 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 08:42:43,952 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1219068302] [2021-10-28 08:42:43,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:42:43,952 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 08:42:43,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:44,155 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 08:42:44,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:44,180 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-28 08:42:44,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:44,472 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 08:42:44,472 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 08:42:44,472 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1219068302] [2021-10-28 08:42:44,472 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1219068302] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 08:42:44,472 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [267272663] [2021-10-28 08:42:44,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:42:44,473 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 08:42:44,473 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 [2021-10-28 08:42:44,476 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-28 08:42:44,499 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-10-28 08:42:44,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:44,893 INFO L263 TraceCheckSpWp]: Trace formula consists of 300 conjuncts, 56 conjunts are in the unsatisfiable core [2021-10-28 08:42:44,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-28 08:42:44,936 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-28 08:42:45,014 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-10-28 08:42:45,015 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 11 treesize of output 11 [2021-10-28 08:42:45,052 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-10-28 08:42:45,099 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-28 08:42:45,103 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-10-28 08:42:45,169 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-28 08:42:45,183 INFO L354 Elim1Store]: treesize reduction 68, result has 21.8 percent of original size [2021-10-28 08:42:45,183 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 56 treesize of output 43 [2021-10-28 08:42:45,881 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 83 treesize of output 75 [2021-10-28 08:42:46,169 INFO L354 Elim1Store]: treesize reduction 42, result has 2.3 percent of original size [2021-10-28 08:42:46,175 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 6 case distinctions, treesize of input 73 treesize of output 25 [2021-10-28 08:42:46,199 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 08:42:46,199 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [267272663] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 08:42:46,199 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-28 08:42:46,200 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 18] total 32 [2021-10-28 08:42:46,200 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1602096200] [2021-10-28 08:42:46,201 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-10-28 08:42:46,201 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 08:42:46,202 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-10-28 08:42:46,203 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=972, Unknown=0, NotChecked=0, Total=1056 [2021-10-28 08:42:46,211 INFO L87 Difference]: Start difference. First operand 103 states and 114 transitions. Second operand has 33 states, 31 states have (on average 2.064516129032258) internal successors, (64), 27 states have internal predecessors, (64), 4 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-10-28 08:42:48,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 08:42:48,201 INFO L93 Difference]: Finished difference Result 112 states and 123 transitions. [2021-10-28 08:42:48,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-10-28 08:42:48,203 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 31 states have (on average 2.064516129032258) internal successors, (64), 27 states have internal predecessors, (64), 4 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 45 [2021-10-28 08:42:48,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 08:42:48,204 INFO L225 Difference]: With dead ends: 112 [2021-10-28 08:42:48,204 INFO L226 Difference]: Without dead ends: 112 [2021-10-28 08:42:48,205 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 35 SyntacticMatches, 2 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 398 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=261, Invalid=2189, Unknown=0, NotChecked=0, Total=2450 [2021-10-28 08:42:48,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2021-10-28 08:42:48,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 103. [2021-10-28 08:42:48,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 80 states have (on average 1.225) internal successors, (98), 92 states have internal predecessors, (98), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (9), 4 states have call predecessors, (9), 5 states have call successors, (9) [2021-10-28 08:42:48,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 113 transitions. [2021-10-28 08:42:48,209 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 113 transitions. Word has length 45 [2021-10-28 08:42:48,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 08:42:48,209 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 113 transitions. [2021-10-28 08:42:48,209 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 31 states have (on average 2.064516129032258) internal successors, (64), 27 states have internal predecessors, (64), 4 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-10-28 08:42:48,209 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 113 transitions. [2021-10-28 08:42:48,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-10-28 08:42:48,210 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 08:42:48,210 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 08:42:48,234 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-10-28 08:42:48,416 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-10-28 08:42:48,416 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting dll_remove_lastErr13REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-28 08:42:48,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 08:42:48,416 INFO L85 PathProgramCache]: Analyzing trace with hash 393927228, now seen corresponding path program 2 times [2021-10-28 08:42:48,416 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 08:42:48,416 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1885998377] [2021-10-28 08:42:48,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:42:48,417 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 08:42:48,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:48,726 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 08:42:48,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:48,762 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-28 08:42:48,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:49,342 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 08:42:49,342 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 08:42:49,342 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1885998377] [2021-10-28 08:42:49,342 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1885998377] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 08:42:49,342 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [399638783] [2021-10-28 08:42:49,342 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-28 08:42:49,342 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 08:42:49,342 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 [2021-10-28 08:42:49,343 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-28 08:42:49,345 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-10-28 08:42:49,741 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-28 08:42:49,741 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-28 08:42:49,743 INFO L263 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 87 conjunts are in the unsatisfiable core [2021-10-28 08:42:49,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-28 08:42:49,817 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-28 08:42:49,861 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-10-28 08:42:49,869 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-10-28 08:42:49,934 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 23 [2021-10-28 08:42:49,937 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-28 08:42:49,939 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-28 08:42:49,940 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 0 case distinctions, treesize of input 18 treesize of output 22 [2021-10-28 08:42:49,946 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 23 [2021-10-28 08:42:49,950 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-28 08:42:49,953 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-28 08:42:49,953 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 0 case distinctions, treesize of input 18 treesize of output 22 [2021-10-28 08:42:50,097 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-10-28 08:42:50,097 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 11 treesize of output 11 [2021-10-28 08:42:50,175 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 21 [2021-10-28 08:42:50,184 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 21 [2021-10-28 08:42:50,208 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 30 [2021-10-28 08:42:50,220 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 30 [2021-10-28 08:42:50,317 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-28 08:42:50,319 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 42 [2021-10-28 08:42:50,335 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-28 08:42:50,337 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 42 [2021-10-28 08:42:50,479 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-28 08:42:50,480 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-28 08:42:50,481 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-28 08:42:50,490 INFO L354 Elim1Store]: treesize reduction 35, result has 20.5 percent of original size [2021-10-28 08:42:50,491 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 7 case distinctions, treesize of input 136 treesize of output 92 [2021-10-28 08:42:50,500 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-28 08:42:50,501 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-28 08:42:50,503 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-28 08:42:50,513 INFO L354 Elim1Store]: treesize reduction 59, result has 13.2 percent of original size [2021-10-28 08:42:50,513 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 113 treesize of output 102 [2021-10-28 08:42:52,237 INFO L354 Elim1Store]: treesize reduction 166, result has 6.2 percent of original size [2021-10-28 08:42:52,238 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 3 disjoint index pairs (out of 21 index pairs), introduced 11 new quantified variables, introduced 21 case distinctions, treesize of input 197 treesize of output 105 [2021-10-28 08:42:52,276 INFO L354 Elim1Store]: treesize reduction 126, result has 5.3 percent of original size [2021-10-28 08:42:52,276 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 3 disjoint index pairs (out of 21 index pairs), introduced 9 new quantified variables, introduced 21 case distinctions, treesize of input 66 treesize of output 46 [2021-10-28 08:42:52,342 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 08:42:52,343 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [399638783] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 08:42:52,343 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-28 08:42:52,343 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 46 [2021-10-28 08:42:52,343 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1886425339] [2021-10-28 08:42:52,343 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-10-28 08:42:52,343 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 08:42:52,344 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-10-28 08:42:52,344 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1941, Unknown=0, NotChecked=0, Total=2070 [2021-10-28 08:42:52,345 INFO L87 Difference]: Start difference. First operand 103 states and 113 transitions. Second operand has 46 states, 45 states have (on average 1.6222222222222222) internal successors, (73), 40 states have internal predecessors, (73), 4 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-10-28 08:42:57,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 08:42:57,385 INFO L93 Difference]: Finished difference Result 103 states and 111 transitions. [2021-10-28 08:42:57,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-10-28 08:42:57,386 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 45 states have (on average 1.6222222222222222) internal successors, (73), 40 states have internal predecessors, (73), 4 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 45 [2021-10-28 08:42:57,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 08:42:57,387 INFO L225 Difference]: With dead ends: 103 [2021-10-28 08:42:57,387 INFO L226 Difference]: Without dead ends: 103 [2021-10-28 08:42:57,388 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 28 SyntacticMatches, 3 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 958 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=360, Invalid=4196, Unknown=0, NotChecked=0, Total=4556 [2021-10-28 08:42:57,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-10-28 08:42:57,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2021-10-28 08:42:57,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 80 states have (on average 1.2125) internal successors, (97), 92 states have internal predecessors, (97), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (8), 4 states have call predecessors, (8), 5 states have call successors, (8) [2021-10-28 08:42:57,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 111 transitions. [2021-10-28 08:42:57,392 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 111 transitions. Word has length 45 [2021-10-28 08:42:57,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 08:42:57,392 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 111 transitions. [2021-10-28 08:42:57,392 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 45 states have (on average 1.6222222222222222) internal successors, (73), 40 states have internal predecessors, (73), 4 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-10-28 08:42:57,393 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 111 transitions. [2021-10-28 08:42:57,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-10-28 08:42:57,393 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 08:42:57,393 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 08:42:57,424 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-10-28 08:42:57,608 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 08:42:57,608 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting mainErr2ASSERT_VIOLATIONMEMORY_LEAK === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-28 08:42:57,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 08:42:57,608 INFO L85 PathProgramCache]: Analyzing trace with hash 2089031702, now seen corresponding path program 1 times [2021-10-28 08:42:57,608 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 08:42:57,608 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [361935944] [2021-10-28 08:42:57,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:42:57,609 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 08:42:57,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:57,661 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 08:42:57,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:57,676 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-28 08:42:57,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:57,699 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-10-28 08:42:57,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:57,707 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-10-28 08:42:57,707 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 08:42:57,707 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [361935944] [2021-10-28 08:42:57,707 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [361935944] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 08:42:57,707 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1581645122] [2021-10-28 08:42:57,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:42:57,708 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 08:42:57,708 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 [2021-10-28 08:42:57,709 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-28 08:42:57,727 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-10-28 08:42:58,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:58,349 INFO L263 TraceCheckSpWp]: Trace formula consists of 275 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-28 08:42:58,350 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-28 08:42:58,446 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-10-28 08:42:58,446 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1581645122] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 08:42:58,446 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-28 08:42:58,446 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5] total 9 [2021-10-28 08:42:58,447 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [799065555] [2021-10-28 08:42:58,447 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-10-28 08:42:58,447 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 08:42:58,447 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-10-28 08:42:58,447 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-10-28 08:42:58,447 INFO L87 Difference]: Start difference. First operand 103 states and 111 transitions. Second operand has 9 states, 9 states have (on average 4.222222222222222) internal successors, (38), 6 states have internal predecessors, (38), 4 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-10-28 08:42:58,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 08:42:58,641 INFO L93 Difference]: Finished difference Result 107 states and 115 transitions. [2021-10-28 08:42:58,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-10-28 08:42:58,642 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.222222222222222) internal successors, (38), 6 states have internal predecessors, (38), 4 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 46 [2021-10-28 08:42:58,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 08:42:58,643 INFO L225 Difference]: With dead ends: 107 [2021-10-28 08:42:58,643 INFO L226 Difference]: Without dead ends: 107 [2021-10-28 08:42:58,643 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2021-10-28 08:42:58,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-10-28 08:42:58,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2021-10-28 08:42:58,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 84 states have (on average 1.2023809523809523) internal successors, (101), 94 states have internal predecessors, (101), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (8), 6 states have call predecessors, (8), 5 states have call successors, (8) [2021-10-28 08:42:58,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 115 transitions. [2021-10-28 08:42:58,647 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 115 transitions. Word has length 46 [2021-10-28 08:42:58,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 08:42:58,647 INFO L470 AbstractCegarLoop]: Abstraction has 107 states and 115 transitions. [2021-10-28 08:42:58,647 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 4.222222222222222) internal successors, (38), 6 states have internal predecessors, (38), 4 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-10-28 08:42:58,647 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 115 transitions. [2021-10-28 08:42:58,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-10-28 08:42:58,648 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 08:42:58,648 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 08:42:58,689 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-10-28 08:42:58,862 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-10-28 08:42:58,862 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting dll_remove_lastErr2REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-28 08:42:58,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 08:42:58,862 INFO L85 PathProgramCache]: Analyzing trace with hash 339086038, now seen corresponding path program 1 times [2021-10-28 08:42:58,862 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 08:42:58,862 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1915827141] [2021-10-28 08:42:58,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:42:58,863 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 08:42:58,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:58,920 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 08:42:58,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:58,934 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-28 08:42:58,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:59,130 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-10-28 08:42:59,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:42:59,383 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 9 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 08:42:59,384 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 08:42:59,384 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1915827141] [2021-10-28 08:42:59,384 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1915827141] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 08:42:59,384 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1118398518] [2021-10-28 08:42:59,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:42:59,384 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 08:42:59,385 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 [2021-10-28 08:42:59,385 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-28 08:42:59,403 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-10-28 08:43:00,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:43:00,021 INFO L263 TraceCheckSpWp]: Trace formula consists of 290 conjuncts, 47 conjunts are in the unsatisfiable core [2021-10-28 08:43:00,024 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-28 08:43:00,060 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-28 08:43:00,163 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-10-28 08:43:00,163 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-10-28 08:43:00,212 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-10-28 08:43:00,254 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2021-10-28 08:43:00,316 INFO L354 Elim1Store]: treesize reduction 56, result has 21.1 percent of original size [2021-10-28 08:43:00,316 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 45 treesize of output 38 [2021-10-28 08:43:01,031 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 25 treesize of output 17 [2021-10-28 08:43:01,106 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 7 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 08:43:01,106 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1118398518] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 08:43:01,106 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-28 08:43:01,106 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 20] total 39 [2021-10-28 08:43:01,106 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2055506916] [2021-10-28 08:43:01,107 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-10-28 08:43:01,107 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 08:43:01,107 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-10-28 08:43:01,108 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1377, Unknown=0, NotChecked=0, Total=1482 [2021-10-28 08:43:01,108 INFO L87 Difference]: Start difference. First operand 107 states and 115 transitions. Second operand has 39 states, 38 states have (on average 1.868421052631579) internal successors, (71), 33 states have internal predecessors, (71), 5 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-10-28 08:43:02,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 08:43:02,766 INFO L93 Difference]: Finished difference Result 105 states and 112 transitions. [2021-10-28 08:43:02,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-10-28 08:43:02,766 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 1.868421052631579) internal successors, (71), 33 states have internal predecessors, (71), 5 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) Word has length 47 [2021-10-28 08:43:02,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 08:43:02,767 INFO L225 Difference]: With dead ends: 105 [2021-10-28 08:43:02,767 INFO L226 Difference]: Without dead ends: 100 [2021-10-28 08:43:02,769 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 607 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=331, Invalid=3091, Unknown=0, NotChecked=0, Total=3422 [2021-10-28 08:43:02,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-10-28 08:43:02,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2021-10-28 08:43:02,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 77 states have (on average 1.2077922077922079) internal successors, (93), 88 states have internal predecessors, (93), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-10-28 08:43:02,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 106 transitions. [2021-10-28 08:43:02,774 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 106 transitions. Word has length 47 [2021-10-28 08:43:02,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 08:43:02,774 INFO L470 AbstractCegarLoop]: Abstraction has 100 states and 106 transitions. [2021-10-28 08:43:02,775 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 38 states have (on average 1.868421052631579) internal successors, (71), 33 states have internal predecessors, (71), 5 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-10-28 08:43:02,775 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 106 transitions. [2021-10-28 08:43:02,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-10-28 08:43:02,776 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 08:43:02,776 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 08:43:02,816 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-10-28 08:43:03,004 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 08:43:03,004 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting dll_remove_lastErr0REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-28 08:43:03,004 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 08:43:03,004 INFO L85 PathProgramCache]: Analyzing trace with hash -1172150217, now seen corresponding path program 1 times [2021-10-28 08:43:03,004 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 08:43:03,004 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1944415011] [2021-10-28 08:43:03,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:43:03,005 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 08:43:03,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:43:03,091 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 08:43:03,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:43:03,107 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-28 08:43:03,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:43:03,133 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-10-28 08:43:03,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:43:03,230 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-10-28 08:43:03,230 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 08:43:03,231 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1944415011] [2021-10-28 08:43:03,231 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1944415011] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 08:43:03,231 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [367099533] [2021-10-28 08:43:03,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:43:03,232 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 08:43:03,232 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 [2021-10-28 08:43:03,240 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-28 08:43:03,260 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-10-28 08:43:03,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:43:03,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 324 conjuncts, 21 conjunts are in the unsatisfiable core [2021-10-28 08:43:03,792 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-28 08:43:03,808 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-28 08:43:03,828 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 9 treesize of output 7 [2021-10-28 08:43:04,040 INFO L354 Elim1Store]: treesize reduction 50, result has 9.1 percent of original size [2021-10-28 08:43:04,041 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 19 [2021-10-28 08:43:04,080 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 9 treesize of output 7 [2021-10-28 08:43:04,234 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-28 08:43:04,234 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 19 [2021-10-28 08:43:04,398 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-10-28 08:43:04,398 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [367099533] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 08:43:04,398 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-28 08:43:04,398 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 24 [2021-10-28 08:43:04,398 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1677755089] [2021-10-28 08:43:04,399 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-10-28 08:43:04,399 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 08:43:04,399 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-10-28 08:43:04,400 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=528, Unknown=0, NotChecked=0, Total=600 [2021-10-28 08:43:04,400 INFO L87 Difference]: Start difference. First operand 100 states and 106 transitions. Second operand has 25 states, 24 states have (on average 3.4166666666666665) internal successors, (82), 21 states have internal predecessors, (82), 5 states have call successors, (9), 7 states have call predecessors, (9), 4 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2021-10-28 08:43:05,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 08:43:05,643 INFO L93 Difference]: Finished difference Result 126 states and 135 transitions. [2021-10-28 08:43:05,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-10-28 08:43:05,644 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 3.4166666666666665) internal successors, (82), 21 states have internal predecessors, (82), 5 states have call successors, (9), 7 states have call predecessors, (9), 4 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) Word has length 53 [2021-10-28 08:43:05,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 08:43:05,644 INFO L225 Difference]: With dead ends: 126 [2021-10-28 08:43:05,644 INFO L226 Difference]: Without dead ends: 126 [2021-10-28 08:43:05,645 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 236 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=233, Invalid=1249, Unknown=0, NotChecked=0, Total=1482 [2021-10-28 08:43:05,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-10-28 08:43:05,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 90. [2021-10-28 08:43:05,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 71 states have (on average 1.1830985915492958) internal successors, (84), 80 states have internal predecessors, (84), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-10-28 08:43:05,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 93 transitions. [2021-10-28 08:43:05,649 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 93 transitions. Word has length 53 [2021-10-28 08:43:05,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 08:43:05,649 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 93 transitions. [2021-10-28 08:43:05,650 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 3.4166666666666665) internal successors, (82), 21 states have internal predecessors, (82), 5 states have call successors, (9), 7 states have call predecessors, (9), 4 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2021-10-28 08:43:05,650 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 93 transitions. [2021-10-28 08:43:05,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-10-28 08:43:05,651 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 08:43:05,651 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 08:43:05,700 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-10-28 08:43:05,864 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 08:43:05,865 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting dll_remove_lastErr2REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-28 08:43:05,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 08:43:05,865 INFO L85 PathProgramCache]: Analyzing trace with hash -1976918352, now seen corresponding path program 1 times [2021-10-28 08:43:05,865 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 08:43:05,865 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1343269423] [2021-10-28 08:43:05,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:43:05,865 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 08:43:05,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:43:06,013 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 08:43:06,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:43:06,037 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-28 08:43:06,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:43:06,142 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-10-28 08:43:06,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:43:07,015 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 8 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-28 08:43:07,016 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 08:43:07,016 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1343269423] [2021-10-28 08:43:07,016 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1343269423] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 08:43:07,016 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1141039856] [2021-10-28 08:43:07,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:43:07,016 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 08:43:07,017 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 [2021-10-28 08:43:07,018 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-28 08:43:07,018 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-10-28 08:43:07,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:43:07,616 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 65 conjunts are in the unsatisfiable core [2021-10-28 08:43:07,617 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-28 08:43:07,668 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-28 08:43:07,781 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-10-28 08:43:07,782 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 2 case distinctions, treesize of input 17 treesize of output 21 [2021-10-28 08:43:07,888 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-10-28 08:43:07,972 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2021-10-28 08:43:08,082 INFO L354 Elim1Store]: treesize reduction 56, result has 21.1 percent of original size [2021-10-28 08:43:08,083 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 54 treesize of output 43 [2021-10-28 08:43:13,016 INFO L354 Elim1Store]: treesize reduction 186, result has 19.8 percent of original size [2021-10-28 08:43:13,017 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 7 new quantified variables, introduced 15 case distinctions, treesize of input 126 treesize of output 99 [2021-10-28 08:43:13,071 INFO L354 Elim1Store]: treesize reduction 48, result has 28.4 percent of original size [2021-10-28 08:43:13,071 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 109 treesize of output 118 [2021-10-28 08:43:15,700 INFO L354 Elim1Store]: treesize reduction 106, result has 17.8 percent of original size [2021-10-28 08:43:15,701 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 3 disjoint index pairs (out of 15 index pairs), introduced 7 new quantified variables, introduced 15 case distinctions, treesize of input 111 treesize of output 80 [2021-10-28 08:43:15,967 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 08:43:15,968 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1141039856] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 08:43:15,968 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-28 08:43:15,968 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 52 [2021-10-28 08:43:15,968 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1240080469] [2021-10-28 08:43:15,969 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-10-28 08:43:15,969 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 08:43:15,969 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-10-28 08:43:15,970 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2617, Unknown=1, NotChecked=0, Total=2756 [2021-10-28 08:43:15,971 INFO L87 Difference]: Start difference. First operand 90 states and 93 transitions. Second operand has 53 states, 50 states have (on average 1.82) internal successors, (91), 45 states have internal predecessors, (91), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-28 08:44:36,709 WARN L207 SmtUtils]: Spent 5.86 s on a formula simplification. DAG size of input: 124 DAG size of output: 120 [2021-10-28 08:44:50,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 08:44:50,436 INFO L93 Difference]: Finished difference Result 140 states and 148 transitions. [2021-10-28 08:44:50,436 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-10-28 08:44:50,437 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 50 states have (on average 1.82) internal successors, (91), 45 states have internal predecessors, (91), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 54 [2021-10-28 08:44:50,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 08:44:50,438 INFO L225 Difference]: With dead ends: 140 [2021-10-28 08:44:50,438 INFO L226 Difference]: Without dead ends: 140 [2021-10-28 08:44:50,443 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2529 ImplicationChecksByTransitivity, 64.1s TimeCoverageRelationStatistics Valid=1228, Invalid=10955, Unknown=27, NotChecked=0, Total=12210 [2021-10-28 08:44:50,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-10-28 08:44:50,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 94. [2021-10-28 08:44:50,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 74 states have (on average 1.1891891891891893) internal successors, (88), 83 states have internal predecessors, (88), 6 states have call successors, (6), 6 states have call predecessors, (6), 4 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-28 08:44:50,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 99 transitions. [2021-10-28 08:44:50,448 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 99 transitions. Word has length 54 [2021-10-28 08:44:50,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 08:44:50,448 INFO L470 AbstractCegarLoop]: Abstraction has 94 states and 99 transitions. [2021-10-28 08:44:50,449 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 50 states have (on average 1.82) internal successors, (91), 45 states have internal predecessors, (91), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-28 08:44:50,449 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 99 transitions. [2021-10-28 08:44:50,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-10-28 08:44:50,450 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 08:44:50,450 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 08:44:50,509 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-10-28 08:44:50,672 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-10-28 08:44:50,672 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting dll_remove_lastErr3REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-28 08:44:50,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 08:44:50,672 INFO L85 PathProgramCache]: Analyzing trace with hash -1976918351, now seen corresponding path program 1 times [2021-10-28 08:44:50,672 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 08:44:50,673 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1165484325] [2021-10-28 08:44:50,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:44:50,673 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 08:44:50,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:44:50,856 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 08:44:50,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:44:50,883 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-28 08:44:50,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:44:51,019 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-10-28 08:44:51,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:44:51,237 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 8 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-28 08:44:51,237 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 08:44:51,237 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1165484325] [2021-10-28 08:44:51,237 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1165484325] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 08:44:51,237 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1257390670] [2021-10-28 08:44:51,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:44:51,238 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 08:44:51,238 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 [2021-10-28 08:44:51,244 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-28 08:44:51,252 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-10-28 08:44:51,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:44:51,927 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 53 conjunts are in the unsatisfiable core [2021-10-28 08:44:51,928 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-28 08:44:52,743 INFO L354 Elim1Store]: treesize reduction 23, result has 47.7 percent of original size [2021-10-28 08:44:52,743 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 67 treesize of output 72 [2021-10-28 08:44:53,308 INFO L354 Elim1Store]: treesize reduction 29, result has 19.4 percent of original size [2021-10-28 08:44:53,309 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 59 treesize of output 45 [2021-10-28 08:44:53,725 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-10-28 08:44:53,726 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 74 treesize of output 51 [2021-10-28 08:44:53,730 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-10-28 08:44:53,731 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 42 treesize of output 24 [2021-10-28 08:44:53,772 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-28 08:44:53,773 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1257390670] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 08:44:53,773 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-28 08:44:53,773 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 37 [2021-10-28 08:44:53,773 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [919721246] [2021-10-28 08:44:53,773 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-10-28 08:44:53,773 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 08:44:53,776 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-10-28 08:44:53,776 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1304, Unknown=0, NotChecked=0, Total=1406 [2021-10-28 08:44:53,777 INFO L87 Difference]: Start difference. First operand 94 states and 99 transitions. Second operand has 38 states, 35 states have (on average 2.4) internal successors, (84), 30 states have internal predecessors, (84), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-28 08:45:06,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 08:45:06,002 INFO L93 Difference]: Finished difference Result 154 states and 164 transitions. [2021-10-28 08:45:06,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-10-28 08:45:06,003 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 35 states have (on average 2.4) internal successors, (84), 30 states have internal predecessors, (84), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 54 [2021-10-28 08:45:06,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 08:45:06,005 INFO L225 Difference]: With dead ends: 154 [2021-10-28 08:45:06,005 INFO L226 Difference]: Without dead ends: 154 [2021-10-28 08:45:06,008 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 938 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=718, Invalid=4830, Unknown=2, NotChecked=0, Total=5550 [2021-10-28 08:45:06,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2021-10-28 08:45:06,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 125. [2021-10-28 08:45:06,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 102 states have (on average 1.2647058823529411) internal successors, (129), 112 states have internal predecessors, (129), 7 states have call successors, (7), 7 states have call predecessors, (7), 6 states have return successors, (9), 5 states have call predecessors, (9), 6 states have call successors, (9) [2021-10-28 08:45:06,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 145 transitions. [2021-10-28 08:45:06,013 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 145 transitions. Word has length 54 [2021-10-28 08:45:06,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 08:45:06,014 INFO L470 AbstractCegarLoop]: Abstraction has 125 states and 145 transitions. [2021-10-28 08:45:06,014 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 35 states have (on average 2.4) internal successors, (84), 30 states have internal predecessors, (84), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-28 08:45:06,014 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 145 transitions. [2021-10-28 08:45:06,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-10-28 08:45:06,015 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 08:45:06,015 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 08:45:06,063 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-10-28 08:45:06,215 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-10-28 08:45:06,216 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting dll_remove_lastErr14REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-28 08:45:06,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 08:45:06,216 INFO L85 PathProgramCache]: Analyzing trace with hash 560464247, now seen corresponding path program 1 times [2021-10-28 08:45:06,216 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 08:45:06,216 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [75460043] [2021-10-28 08:45:06,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:45:06,217 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 08:45:06,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:45:06,494 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 08:45:06,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:45:06,523 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-28 08:45:06,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:45:06,660 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-10-28 08:45:06,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:45:06,909 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-28 08:45:06,909 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 08:45:06,909 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [75460043] [2021-10-28 08:45:06,910 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [75460043] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 08:45:06,910 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [882165974] [2021-10-28 08:45:06,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:45:06,910 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 08:45:06,910 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 [2021-10-28 08:45:06,912 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-28 08:45:06,928 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-10-28 08:45:07,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:45:07,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 15 conjunts are in the unsatisfiable core [2021-10-28 08:45:07,974 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-28 08:45:08,176 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 39 treesize of output 31 [2021-10-28 08:45:08,179 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 28 treesize of output 16 [2021-10-28 08:45:08,240 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-10-28 08:45:08,240 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [882165974] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-28 08:45:08,240 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-10-28 08:45:08,240 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [21] total 25 [2021-10-28 08:45:08,240 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2018093025] [2021-10-28 08:45:08,241 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-10-28 08:45:08,241 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 08:45:08,241 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-28 08:45:08,241 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=588, Unknown=0, NotChecked=0, Total=650 [2021-10-28 08:45:08,242 INFO L87 Difference]: Start difference. First operand 125 states and 145 transitions. Second operand has 6 states, 5 states have (on average 8.2) internal successors, (41), 6 states have internal predecessors, (41), 1 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-10-28 08:45:08,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 08:45:08,397 INFO L93 Difference]: Finished difference Result 127 states and 147 transitions. [2021-10-28 08:45:08,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-10-28 08:45:08,398 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 8.2) internal successors, (41), 6 states have internal predecessors, (41), 1 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 58 [2021-10-28 08:45:08,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 08:45:08,399 INFO L225 Difference]: With dead ends: 127 [2021-10-28 08:45:08,399 INFO L226 Difference]: Without dead ends: 127 [2021-10-28 08:45:08,399 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=74, Invalid=738, Unknown=0, NotChecked=0, Total=812 [2021-10-28 08:45:08,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-10-28 08:45:08,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 125. [2021-10-28 08:45:08,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 102 states have (on average 1.2450980392156863) internal successors, (127), 112 states have internal predecessors, (127), 7 states have call successors, (7), 7 states have call predecessors, (7), 6 states have return successors, (9), 5 states have call predecessors, (9), 6 states have call successors, (9) [2021-10-28 08:45:08,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 143 transitions. [2021-10-28 08:45:08,405 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 143 transitions. Word has length 58 [2021-10-28 08:45:08,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 08:45:08,406 INFO L470 AbstractCegarLoop]: Abstraction has 125 states and 143 transitions. [2021-10-28 08:45:08,406 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 8.2) internal successors, (41), 6 states have internal predecessors, (41), 1 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-10-28 08:45:08,406 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 143 transitions. [2021-10-28 08:45:08,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-10-28 08:45:08,407 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 08:45:08,407 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 08:45:08,438 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-10-28 08:45:08,620 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 08:45:08,620 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting dll_remove_lastErr7ASSERT_VIOLATIONMEMORY_FREE === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-28 08:45:08,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 08:45:08,620 INFO L85 PathProgramCache]: Analyzing trace with hash 560033297, now seen corresponding path program 1 times [2021-10-28 08:45:08,620 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 08:45:08,621 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1460077482] [2021-10-28 08:45:08,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:45:08,621 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 08:45:08,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:45:08,747 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 08:45:08,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:45:08,767 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-28 08:45:08,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:45:08,862 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-10-28 08:45:08,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:45:09,082 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 8 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-28 08:45:09,082 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 08:45:09,082 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1460077482] [2021-10-28 08:45:09,083 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1460077482] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 08:45:09,083 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [68591610] [2021-10-28 08:45:09,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:45:09,083 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 08:45:09,083 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 [2021-10-28 08:45:09,088 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-28 08:45:09,107 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-10-28 08:45:10,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:45:10,183 INFO L263 TraceCheckSpWp]: Trace formula consists of 354 conjuncts, 41 conjunts are in the unsatisfiable core [2021-10-28 08:45:10,186 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-28 08:45:10,389 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 13 treesize of output 9 [2021-10-28 08:45:11,655 WARN L860 $PredicateComparison]: unable to prove that (exists ((dll_remove_last_~snd_to_last~0.offset Int)) (= (let ((.cse0 (select (select |c_old(#memory_$Pointer$.base)| |c_dll_remove_last_#in~head.base|) |c_dll_remove_last_#in~head.offset|))) (store |c_old(#memory_$Pointer$.base)| .cse0 (store (select |c_old(#memory_$Pointer$.base)| .cse0) (+ dll_remove_last_~snd_to_last~0.offset 4) 0))) |c_#memory_$Pointer$.base|)) is different from true [2021-10-28 08:45:11,710 INFO L354 Elim1Store]: treesize reduction 29, result has 19.4 percent of original size [2021-10-28 08:45:11,710 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 25 [2021-10-28 08:45:11,967 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-10-28 08:45:11,968 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 18 [2021-10-28 08:45:11,975 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-28 08:45:11,976 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [68591610] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 08:45:11,976 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-28 08:45:11,976 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 17] total 28 [2021-10-28 08:45:11,976 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1349807302] [2021-10-28 08:45:11,977 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-10-28 08:45:11,977 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 08:45:11,978 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-10-28 08:45:11,978 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=671, Unknown=1, NotChecked=52, Total=812 [2021-10-28 08:45:11,978 INFO L87 Difference]: Start difference. First operand 125 states and 143 transitions. Second operand has 29 states, 26 states have (on average 2.8076923076923075) internal successors, (73), 21 states have internal predecessors, (73), 7 states have call successors, (9), 7 states have call predecessors, (9), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-28 08:46:23,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 08:46:23,392 INFO L93 Difference]: Finished difference Result 151 states and 161 transitions. [2021-10-28 08:46:23,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-10-28 08:46:23,393 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 26 states have (on average 2.8076923076923075) internal successors, (73), 21 states have internal predecessors, (73), 7 states have call successors, (9), 7 states have call predecessors, (9), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 58 [2021-10-28 08:46:23,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 08:46:23,394 INFO L225 Difference]: With dead ends: 151 [2021-10-28 08:46:23,394 INFO L226 Difference]: Without dead ends: 151 [2021-10-28 08:46:23,396 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 666 ImplicationChecksByTransitivity, 72.1s TimeCoverageRelationStatistics Valid=503, Invalid=2851, Unknown=72, NotChecked=114, Total=3540 [2021-10-28 08:46:23,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2021-10-28 08:46:23,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 128. [2021-10-28 08:46:23,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 105 states have (on average 1.2380952380952381) internal successors, (130), 115 states have internal predecessors, (130), 7 states have call successors, (7), 7 states have call predecessors, (7), 6 states have return successors, (9), 5 states have call predecessors, (9), 6 states have call successors, (9) [2021-10-28 08:46:23,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 146 transitions. [2021-10-28 08:46:23,402 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 146 transitions. Word has length 58 [2021-10-28 08:46:23,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 08:46:23,403 INFO L470 AbstractCegarLoop]: Abstraction has 128 states and 146 transitions. [2021-10-28 08:46:23,403 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 26 states have (on average 2.8076923076923075) internal successors, (73), 21 states have internal predecessors, (73), 7 states have call successors, (9), 7 states have call predecessors, (9), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-28 08:46:23,403 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 146 transitions. [2021-10-28 08:46:23,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-10-28 08:46:23,404 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 08:46:23,404 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 08:46:23,452 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-10-28 08:46:23,605 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-10-28 08:46:23,605 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting dll_remove_lastErr9REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-28 08:46:23,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 08:46:23,605 INFO L85 PathProgramCache]: Analyzing trace with hash 1321089012, now seen corresponding path program 1 times [2021-10-28 08:46:23,606 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 08:46:23,606 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1254959651] [2021-10-28 08:46:23,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:46:23,606 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 08:46:23,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:46:23,757 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 08:46:23,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:46:23,781 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-28 08:46:23,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:46:23,814 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-10-28 08:46:23,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:46:23,825 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-10-28 08:46:23,825 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 08:46:23,825 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1254959651] [2021-10-28 08:46:23,825 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1254959651] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 08:46:23,826 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2079730505] [2021-10-28 08:46:23,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:46:23,826 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 08:46:23,826 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 [2021-10-28 08:46:23,827 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-28 08:46:23,844 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-10-28 08:46:24,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:46:24,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-28 08:46:24,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-28 08:46:25,089 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-28 08:46:25,089 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 19 [2021-10-28 08:46:25,125 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-10-28 08:46:25,125 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2079730505] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-28 08:46:25,126 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-10-28 08:46:25,126 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [11] total 13 [2021-10-28 08:46:25,126 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1918657289] [2021-10-28 08:46:25,127 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-10-28 08:46:25,127 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 08:46:25,127 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-10-28 08:46:25,127 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-10-28 08:46:25,128 INFO L87 Difference]: Start difference. First operand 128 states and 146 transitions. Second operand has 8 states, 7 states have (on average 6.285714285714286) internal successors, (44), 7 states have internal predecessors, (44), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-10-28 08:46:25,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 08:46:25,336 INFO L93 Difference]: Finished difference Result 129 states and 149 transitions. [2021-10-28 08:46:25,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-10-28 08:46:25,337 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 6.285714285714286) internal successors, (44), 7 states have internal predecessors, (44), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 60 [2021-10-28 08:46:25,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 08:46:25,338 INFO L225 Difference]: With dead ends: 129 [2021-10-28 08:46:25,338 INFO L226 Difference]: Without dead ends: 129 [2021-10-28 08:46:25,339 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=68, Invalid=238, Unknown=0, NotChecked=0, Total=306 [2021-10-28 08:46:25,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2021-10-28 08:46:25,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 127. [2021-10-28 08:46:25,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 105 states have (on average 1.2285714285714286) internal successors, (129), 114 states have internal predecessors, (129), 7 states have call successors, (7), 7 states have call predecessors, (7), 6 states have return successors, (9), 5 states have call predecessors, (9), 6 states have call successors, (9) [2021-10-28 08:46:25,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 145 transitions. [2021-10-28 08:46:25,344 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 145 transitions. Word has length 60 [2021-10-28 08:46:25,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 08:46:25,345 INFO L470 AbstractCegarLoop]: Abstraction has 127 states and 145 transitions. [2021-10-28 08:46:25,345 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 6.285714285714286) internal successors, (44), 7 states have internal predecessors, (44), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-10-28 08:46:25,345 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 145 transitions. [2021-10-28 08:46:25,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-10-28 08:46:25,346 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 08:46:25,346 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 08:46:25,398 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-10-28 08:46:25,560 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 08:46:25,560 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting dll_remove_lastErr13REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-28 08:46:25,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 08:46:25,560 INFO L85 PathProgramCache]: Analyzing trace with hash 1108481324, now seen corresponding path program 1 times [2021-10-28 08:46:25,560 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 08:46:25,561 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [77853210] [2021-10-28 08:46:25,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:46:25,561 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 08:46:25,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:46:25,836 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 08:46:25,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:46:25,869 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-28 08:46:25,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:46:26,006 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-10-28 08:46:26,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:46:26,371 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 13 proven. 14 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-28 08:46:26,371 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 08:46:26,371 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [77853210] [2021-10-28 08:46:26,371 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [77853210] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 08:46:26,371 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [581132629] [2021-10-28 08:46:26,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:46:26,372 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 08:46:26,372 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 [2021-10-28 08:46:26,373 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-28 08:46:26,393 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-10-28 08:46:27,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:46:27,491 INFO L263 TraceCheckSpWp]: Trace formula consists of 382 conjuncts, 74 conjunts are in the unsatisfiable core [2021-10-28 08:46:27,494 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-28 08:46:28,319 INFO L354 Elim1Store]: treesize reduction 21, result has 47.5 percent of original size [2021-10-28 08:46:28,320 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 68 treesize of output 70 [2021-10-28 08:46:28,554 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 117 treesize of output 116 [2021-10-28 08:46:28,754 INFO L354 Elim1Store]: treesize reduction 55, result has 11.3 percent of original size [2021-10-28 08:46:28,755 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 71 treesize of output 47 [2021-10-28 08:46:29,078 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-10-28 08:46:29,078 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 11 treesize of output 11 [2021-10-28 08:46:29,440 INFO L354 Elim1Store]: treesize reduction 17, result has 5.6 percent of original size [2021-10-28 08:46:29,440 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 78 treesize of output 41 [2021-10-28 08:46:29,447 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-10-28 08:46:29,447 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 20 [2021-10-28 08:46:29,521 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 15 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-28 08:46:29,521 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [581132629] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 08:46:29,522 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-28 08:46:29,522 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 24] total 44 [2021-10-28 08:46:29,522 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1047901001] [2021-10-28 08:46:29,523 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-10-28 08:46:29,523 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 08:46:29,523 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-10-28 08:46:29,524 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1784, Unknown=0, NotChecked=0, Total=1892 [2021-10-28 08:46:29,524 INFO L87 Difference]: Start difference. First operand 127 states and 145 transitions. Second operand has 44 states, 42 states have (on average 2.3095238095238093) internal successors, (97), 36 states have internal predecessors, (97), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-28 08:46:34,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 08:46:34,938 INFO L93 Difference]: Finished difference Result 117 states and 121 transitions. [2021-10-28 08:46:34,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-10-28 08:46:34,940 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 42 states have (on average 2.3095238095238093) internal successors, (97), 36 states have internal predecessors, (97), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 62 [2021-10-28 08:46:34,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 08:46:34,942 INFO L225 Difference]: With dead ends: 117 [2021-10-28 08:46:34,942 INFO L226 Difference]: Without dead ends: 113 [2021-10-28 08:46:34,943 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 511 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=361, Invalid=3929, Unknown=0, NotChecked=0, Total=4290 [2021-10-28 08:46:34,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-10-28 08:46:34,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 107. [2021-10-28 08:46:34,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 87 states have (on average 1.1839080459770115) internal successors, (103), 96 states have internal predecessors, (103), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2021-10-28 08:46:34,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 115 transitions. [2021-10-28 08:46:34,948 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 115 transitions. Word has length 62 [2021-10-28 08:46:34,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 08:46:34,949 INFO L470 AbstractCegarLoop]: Abstraction has 107 states and 115 transitions. [2021-10-28 08:46:34,949 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 42 states have (on average 2.3095238095238093) internal successors, (97), 36 states have internal predecessors, (97), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-28 08:46:34,949 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 115 transitions. [2021-10-28 08:46:34,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-10-28 08:46:34,950 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 08:46:34,951 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 08:46:35,003 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-10-28 08:46:35,172 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-10-28 08:46:35,172 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting mainErr2ASSERT_VIOLATIONMEMORY_LEAK === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-28 08:46:35,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 08:46:35,172 INFO L85 PathProgramCache]: Analyzing trace with hash 17828144, now seen corresponding path program 1 times [2021-10-28 08:46:35,172 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 08:46:35,173 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [494133723] [2021-10-28 08:46:35,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:46:35,173 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 08:46:35,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:46:35,275 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 08:46:35,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:46:35,297 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-28 08:46:35,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:46:35,323 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-10-28 08:46:35,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:46:35,332 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 50 [2021-10-28 08:46:35,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:46:35,376 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-10-28 08:46:35,376 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 08:46:35,377 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [494133723] [2021-10-28 08:46:35,377 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [494133723] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-28 08:46:35,377 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-28 08:46:35,377 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-10-28 08:46:35,377 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [883739724] [2021-10-28 08:46:35,379 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-10-28 08:46:35,379 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 08:46:35,380 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-10-28 08:46:35,380 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-10-28 08:46:35,381 INFO L87 Difference]: Start difference. First operand 107 states and 115 transitions. Second operand has 9 states, 9 states have (on average 5.555555555555555) internal successors, (50), 6 states have internal predecessors, (50), 1 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2021-10-28 08:46:35,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 08:46:35,929 INFO L93 Difference]: Finished difference Result 107 states and 115 transitions. [2021-10-28 08:46:35,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-10-28 08:46:35,930 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 5.555555555555555) internal successors, (50), 6 states have internal predecessors, (50), 1 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 67 [2021-10-28 08:46:35,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 08:46:35,931 INFO L225 Difference]: With dead ends: 107 [2021-10-28 08:46:35,931 INFO L226 Difference]: Without dead ends: 107 [2021-10-28 08:46:35,931 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=68, Invalid=204, Unknown=0, NotChecked=0, Total=272 [2021-10-28 08:46:35,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-10-28 08:46:35,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 105. [2021-10-28 08:46:35,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 86 states have (on average 1.1744186046511629) internal successors, (101), 94 states have internal predecessors, (101), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2021-10-28 08:46:35,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 113 transitions. [2021-10-28 08:46:35,936 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 113 transitions. Word has length 67 [2021-10-28 08:46:35,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 08:46:35,936 INFO L470 AbstractCegarLoop]: Abstraction has 105 states and 113 transitions. [2021-10-28 08:46:35,937 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 5.555555555555555) internal successors, (50), 6 states have internal predecessors, (50), 1 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2021-10-28 08:46:35,937 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 113 transitions. [2021-10-28 08:46:35,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-10-28 08:46:35,938 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 08:46:35,938 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 08:46:35,938 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2021-10-28 08:46:35,938 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting mainErr3ENSURES_VIOLATIONMEMORY_LEAK === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-28 08:46:35,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 08:46:35,939 INFO L85 PathProgramCache]: Analyzing trace with hash 17828209, now seen corresponding path program 1 times [2021-10-28 08:46:35,939 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 08:46:35,939 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1842956485] [2021-10-28 08:46:35,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:46:35,939 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 08:46:35,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:46:36,284 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 08:46:36,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:46:36,311 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-28 08:46:36,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:46:36,862 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-10-28 08:46:36,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:46:37,735 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 50 [2021-10-28 08:46:37,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:46:37,974 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-28 08:46:37,974 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 08:46:37,975 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1842956485] [2021-10-28 08:46:37,975 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1842956485] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 08:46:37,975 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [978717738] [2021-10-28 08:46:37,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:46:37,975 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 08:46:37,975 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 [2021-10-28 08:46:37,976 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-28 08:46:37,981 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-10-28 08:46:38,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:46:38,964 INFO L263 TraceCheckSpWp]: Trace formula consists of 384 conjuncts, 105 conjunts are in the unsatisfiable core [2021-10-28 08:46:38,990 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-28 08:46:39,074 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 9 treesize of output 7 [2021-10-28 08:46:39,341 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-10-28 08:46:39,432 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-28 08:46:39,432 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-10-28 08:46:39,580 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-28 08:46:39,599 INFO L354 Elim1Store]: treesize reduction 68, result has 21.8 percent of original size [2021-10-28 08:46:39,599 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 75 treesize of output 56 [2021-10-28 08:46:46,070 INFO L354 Elim1Store]: treesize reduction 254, result has 13.0 percent of original size [2021-10-28 08:46:46,070 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 7 new quantified variables, introduced 15 case distinctions, treesize of input 185 treesize of output 122 [2021-10-28 08:46:46,079 INFO L354 Elim1Store]: treesize reduction 17, result has 5.6 percent of original size [2021-10-28 08:46:46,080 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 146 treesize of output 131 [2021-10-28 08:46:47,287 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 7 treesize of output 3 [2021-10-28 08:46:47,490 INFO L354 Elim1Store]: treesize reduction 85, result has 8.6 percent of original size [2021-10-28 08:46:47,490 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 6 new quantified variables, introduced 10 case distinctions, treesize of input 127 treesize of output 74 [2021-10-28 08:46:48,056 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 08:46:48,056 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [978717738] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 08:46:48,057 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-28 08:46:48,057 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31] total 59 [2021-10-28 08:46:48,057 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [551889162] [2021-10-28 08:46:48,057 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2021-10-28 08:46:48,058 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 08:46:48,058 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-10-28 08:46:48,059 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=3350, Unknown=1, NotChecked=0, Total=3540 [2021-10-28 08:46:48,059 INFO L87 Difference]: Start difference. First operand 105 states and 113 transitions. Second operand has 60 states, 57 states have (on average 1.9649122807017543) internal successors, (112), 53 states have internal predecessors, (112), 7 states have call successors, (9), 7 states have call predecessors, (9), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-10-28 08:47:03,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 08:47:03,599 INFO L93 Difference]: Finished difference Result 119 states and 126 transitions. [2021-10-28 08:47:03,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-10-28 08:47:03,599 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 57 states have (on average 1.9649122807017543) internal successors, (112), 53 states have internal predecessors, (112), 7 states have call successors, (9), 7 states have call predecessors, (9), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Word has length 67 [2021-10-28 08:47:03,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 08:47:03,601 INFO L225 Difference]: With dead ends: 119 [2021-10-28 08:47:03,601 INFO L226 Difference]: Without dead ends: 116 [2021-10-28 08:47:03,602 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1358 ImplicationChecksByTransitivity, 15.8s TimeCoverageRelationStatistics Valid=430, Invalid=6047, Unknown=3, NotChecked=0, Total=6480 [2021-10-28 08:47:03,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-10-28 08:47:03,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 99. [2021-10-28 08:47:03,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 80 states have (on average 1.125) internal successors, (90), 87 states have internal predecessors, (90), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-10-28 08:47:03,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2021-10-28 08:47:03,606 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 67 [2021-10-28 08:47:03,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 08:47:03,606 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2021-10-28 08:47:03,606 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 57 states have (on average 1.9649122807017543) internal successors, (112), 53 states have internal predecessors, (112), 7 states have call successors, (9), 7 states have call predecessors, (9), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-10-28 08:47:03,606 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2021-10-28 08:47:03,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-10-28 08:47:03,607 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 08:47:03,607 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 08:47:03,632 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-10-28 08:47:03,807 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-10-28 08:47:03,808 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting dll_remove_lastErr2REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-28 08:47:03,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 08:47:03,808 INFO L85 PathProgramCache]: Analyzing trace with hash 556285180, now seen corresponding path program 1 times [2021-10-28 08:47:03,808 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 08:47:03,808 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1889222192] [2021-10-28 08:47:03,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 08:47:03,808 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 08:47:03,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:47:03,895 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 08:47:03,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:47:03,918 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-28 08:47:03,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:47:03,943 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-10-28 08:47:03,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:47:03,952 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 50 [2021-10-28 08:47:03,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 08:47:03,959 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-10-28 08:47:03,959 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 08:47:03,959 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1889222192] [2021-10-28 08:47:03,960 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1889222192] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-28 08:47:03,960 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-28 08:47:03,960 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-10-28 08:47:03,960 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [19288886] [2021-10-28 08:47:03,961 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-10-28 08:47:03,961 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 08:47:03,961 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-10-28 08:47:03,961 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-10-28 08:47:03,962 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand has 9 states, 9 states have (on average 5.222222222222222) internal successors, (47), 6 states have internal predecessors, (47), 5 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-10-28 08:47:04,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 08:47:04,100 INFO L93 Difference]: Finished difference Result 64 states and 63 transitions. [2021-10-28 08:47:04,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-10-28 08:47:04,100 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 5.222222222222222) internal successors, (47), 6 states have internal predecessors, (47), 5 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 68 [2021-10-28 08:47:04,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 08:47:04,101 INFO L225 Difference]: With dead ends: 64 [2021-10-28 08:47:04,101 INFO L226 Difference]: Without dead ends: 0 [2021-10-28 08:47:04,101 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=42, Invalid=114, Unknown=0, NotChecked=0, Total=156 [2021-10-28 08:47:04,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-10-28 08:47:04,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-10-28 08:47:04,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-28 08:47:04,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-10-28 08:47:04,102 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 68 [2021-10-28 08:47:04,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 08:47:04,102 INFO L470 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-10-28 08:47:04,102 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 5.222222222222222) internal successors, (47), 6 states have internal predecessors, (47), 5 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-10-28 08:47:04,102 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-10-28 08:47:04,102 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-10-28 08:47:04,104 INFO L764 garLoopResultBuilder]: Registering result SAFE for location node_createErr0REQUIRES_VIOLATION [2021-10-28 08:47:04,105 INFO L764 garLoopResultBuilder]: Registering result SAFE for location node_createErr1REQUIRES_VIOLATION [2021-10-28 08:47:04,105 INFO L764 garLoopResultBuilder]: Registering result SAFE for location node_createErr2REQUIRES_VIOLATION [2021-10-28 08:47:04,105 INFO L764 garLoopResultBuilder]: Registering result SAFE for location node_createErr3REQUIRES_VIOLATION [2021-10-28 08:47:04,105 INFO L764 garLoopResultBuilder]: Registering result SAFE for location node_createErr4REQUIRES_VIOLATION [2021-10-28 08:47:04,105 INFO L764 garLoopResultBuilder]: Registering result SAFE for location node_createErr5REQUIRES_VIOLATION [2021-10-28 08:47:04,106 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr0REQUIRES_VIOLATION [2021-10-28 08:47:04,106 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr1REQUIRES_VIOLATION [2021-10-28 08:47:04,106 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr2REQUIRES_VIOLATION [2021-10-28 08:47:04,106 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr3REQUIRES_VIOLATION [2021-10-28 08:47:04,106 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr4REQUIRES_VIOLATION [2021-10-28 08:47:04,106 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr5REQUIRES_VIOLATION [2021-10-28 08:47:04,107 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr6ASSERT_VIOLATIONMEMORY_FREE [2021-10-28 08:47:04,107 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr7ASSERT_VIOLATIONMEMORY_FREE [2021-10-28 08:47:04,107 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr8ASSERT_VIOLATIONMEMORY_FREE [2021-10-28 08:47:04,107 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr9REQUIRES_VIOLATION [2021-10-28 08:47:04,107 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr10REQUIRES_VIOLATION [2021-10-28 08:47:04,108 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr11REQUIRES_VIOLATION [2021-10-28 08:47:04,108 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr12REQUIRES_VIOLATION [2021-10-28 08:47:04,108 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr13REQUIRES_VIOLATION [2021-10-28 08:47:04,108 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr14REQUIRES_VIOLATION [2021-10-28 08:47:04,108 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr15REQUIRES_VIOLATION [2021-10-28 08:47:04,108 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr16REQUIRES_VIOLATION [2021-10-28 08:47:04,109 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr17REQUIRES_VIOLATION [2021-10-28 08:47:04,109 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr18REQUIRES_VIOLATION [2021-10-28 08:47:04,109 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr19ASSERT_VIOLATIONMEMORY_FREE [2021-10-28 08:47:04,109 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr20ASSERT_VIOLATIONMEMORY_FREE [2021-10-28 08:47:04,109 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr21ASSERT_VIOLATIONMEMORY_FREE [2021-10-28 08:47:04,110 INFO L764 garLoopResultBuilder]: Registering result SAFE for location mainErr0REQUIRES_VIOLATION [2021-10-28 08:47:04,110 INFO L764 garLoopResultBuilder]: Registering result SAFE for location mainErr1REQUIRES_VIOLATION [2021-10-28 08:47:04,110 INFO L764 garLoopResultBuilder]: Registering result SAFE for location mainErr2ASSERT_VIOLATIONMEMORY_LEAK [2021-10-28 08:47:04,110 INFO L764 garLoopResultBuilder]: Registering result SAFE for location mainErr3ENSURES_VIOLATIONMEMORY_LEAK [2021-10-28 08:47:04,110 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_createErr0REQUIRES_VIOLATION [2021-10-28 08:47:04,111 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_createErr1REQUIRES_VIOLATION [2021-10-28 08:47:04,111 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_createErr2REQUIRES_VIOLATION [2021-10-28 08:47:04,111 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_createErr3REQUIRES_VIOLATION [2021-10-28 08:47:04,111 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_createErr4REQUIRES_VIOLATION [2021-10-28 08:47:04,111 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_createErr5REQUIRES_VIOLATION [2021-10-28 08:47:04,111 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_createErr6REQUIRES_VIOLATION [2021-10-28 08:47:04,112 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_createErr7REQUIRES_VIOLATION [2021-10-28 08:47:04,112 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2021-10-28 08:47:04,115 INFO L731 BasicCegarLoop]: Path program 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 08:47:04,118 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-10-28 08:47:04,121 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 28.10 08:47:04 BoogieIcfgContainer [2021-10-28 08:47:04,121 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-10-28 08:47:04,121 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-10-28 08:47:04,122 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-10-28 08:47:04,122 INFO L275 PluginConnector]: Witness Printer initialized [2021-10-28 08:47:04,122 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.10 08:41:58" (3/4) ... [2021-10-28 08:47:04,126 INFO L137 WitnessPrinter]: Generating witness for correct program [2021-10-28 08:47:04,132 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure reach_error [2021-10-28 08:47:04,132 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure dll_remove_last [2021-10-28 08:47:04,132 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2021-10-28 08:47:04,133 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure myexit [2021-10-28 08:47:04,133 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure dll_create [2021-10-28 08:47:04,133 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __bswap_32 [2021-10-28 08:47:04,133 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __bswap_64 [2021-10-28 08:47:04,133 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2021-10-28 08:47:04,133 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure node_create [2021-10-28 08:47:04,139 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 15 nodes and edges [2021-10-28 08:47:04,139 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 7 nodes and edges [2021-10-28 08:47:04,139 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2021-10-28 08:47:04,140 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-10-28 08:47:04,180 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/witness.graphml [2021-10-28 08:47:04,181 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-10-28 08:47:04,182 INFO L168 Benchmark]: Toolchain (without parser) took 307558.82 ms. Allocated memory was 102.8 MB in the beginning and 281.0 MB in the end (delta: 178.3 MB). Free memory was 63.8 MB in the beginning and 67.7 MB in the end (delta: -3.9 MB). Peak memory consumption was 174.0 MB. Max. memory is 16.1 GB. [2021-10-28 08:47:04,182 INFO L168 Benchmark]: CDTParser took 0.36 ms. Allocated memory is still 102.8 MB. Free memory is still 81.6 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-10-28 08:47:04,182 INFO L168 Benchmark]: CACSL2BoogieTranslator took 750.89 ms. Allocated memory is still 102.8 MB. Free memory was 63.6 MB in the beginning and 69.8 MB in the end (delta: -6.2 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2021-10-28 08:47:04,183 INFO L168 Benchmark]: Boogie Preprocessor took 110.85 ms. Allocated memory is still 102.8 MB. Free memory was 69.8 MB in the beginning and 67.0 MB in the end (delta: 2.8 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-28 08:47:04,183 INFO L168 Benchmark]: RCFGBuilder took 904.79 ms. Allocated memory is still 102.8 MB. Free memory was 67.0 MB in the beginning and 42.2 MB in the end (delta: 24.8 MB). Peak memory consumption was 25.2 MB. Max. memory is 16.1 GB. [2021-10-28 08:47:04,184 INFO L168 Benchmark]: TraceAbstraction took 305720.15 ms. Allocated memory was 102.8 MB in the beginning and 281.0 MB in the end (delta: 178.3 MB). Free memory was 41.9 MB in the beginning and 71.9 MB in the end (delta: -30.0 MB). Peak memory consumption was 151.4 MB. Max. memory is 16.1 GB. [2021-10-28 08:47:04,184 INFO L168 Benchmark]: Witness Printer took 59.54 ms. Allocated memory is still 281.0 MB. Free memory was 71.9 MB in the beginning and 67.7 MB in the end (delta: 4.2 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2021-10-28 08:47:04,186 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.36 ms. Allocated memory is still 102.8 MB. Free memory is still 81.6 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 750.89 ms. Allocated memory is still 102.8 MB. Free memory was 63.6 MB in the beginning and 69.8 MB in the end (delta: -6.2 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 110.85 ms. Allocated memory is still 102.8 MB. Free memory was 69.8 MB in the beginning and 67.0 MB in the end (delta: 2.8 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 904.79 ms. Allocated memory is still 102.8 MB. Free memory was 67.0 MB in the beginning and 42.2 MB in the end (delta: 24.8 MB). Peak memory consumption was 25.2 MB. Max. memory is 16.1 GB. * TraceAbstraction took 305720.15 ms. Allocated memory was 102.8 MB in the beginning and 281.0 MB in the end (delta: 178.3 MB). Free memory was 41.9 MB in the beginning and 71.9 MB in the end (delta: -30.0 MB). Peak memory consumption was 151.4 MB. Max. memory is 16.1 GB. * Witness Printer took 59.54 ms. Allocated memory is still 281.0 MB. Free memory was 71.9 MB in the beginning and 67.7 MB in the end (delta: 4.2 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - PositiveResult [Line: 580]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 580]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 581]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 581]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 582]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 582]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 604]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 604]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 604]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 604]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 605]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 605]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 605]: free always succeeds For all program executions holds that free always succeeds at this location - PositiveResult [Line: 605]: free always succeeds For all program executions holds that free always succeeds at this location - PositiveResult [Line: 605]: free always succeeds For all program executions holds that free always succeeds at this location - PositiveResult [Line: 606]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 606]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 609]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 609]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 610]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 610]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 612]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 612]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 614]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 614]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 615]: free always succeeds For all program executions holds that free always succeeds at this location - PositiveResult [Line: 615]: free always succeeds For all program executions holds that free always succeeds at this location - PositiveResult [Line: 615]: free always succeeds For all program executions holds that free always succeeds at this location - PositiveResult [Line: 626]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 626]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 630]: all allocated memory was freed For all program executions holds that all allocated memory was freed at this location - PositiveResult [Line: 618]: all allocated memory was freed For all program executions holds that all allocated memory was freed at this location - PositiveResult [Line: 592]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 592]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 593]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 593]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 594]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 594]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 596]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 596]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 10 procedures, 113 locations, 40 error locations. Started 1 CEGAR loops. OverallTime: 305.6s, OverallIterations: 40, TraceHistogramMax: 3, PathProgramHistogramMax: 2, EmptinessCheckTime: 0.0s, AutomataDifference: 233.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 1623 SDtfs, 6815 SDslu, 7985 SDs, 0 SdLazy, 29179 SolverSat, 1151 SolverUnsat, 61 SolverUnknown, 0 SolverNotchecked, 66.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 2143 GetRequests, 992 SyntacticMatches, 18 SemanticMatches, 1133 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 10122 ImplicationChecksByTransitivity, 191.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=156occurred in iteration=17, InterpolantAutomatonStates: 663, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.3s AutomataMinimizationTime, 40 MinimizatonAttempts, 468 StatesRemovedByMinimization, 29 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.4s SsaConstructionTime, 1.7s SatisfiabilityAnalysisTime, 51.9s InterpolantComputationTime, 2654 NumberOfCodeBlocks, 2640 NumberOfCodeBlocksAsserted, 66 NumberOfCheckSat, 2590 ConstructedInterpolants, 199 QuantifiedInterpolants, 34610 SizeOfPredicates, 242 NumberOfNonLiveVariables, 6685 ConjunctsInSsa, 804 ConjunctsInUnsatCore, 64 InterpolantComputations, 19 PerfectInterpolantSequences, 428/779 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 40 specifications checked. All of them hold RESULT: Ultimate proved your program to be correct! [2021-10-28 08:47:04,410 WARN L435 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forcibly destroying the process [2021-10-28 08:47:04,483 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03aa322f-d22c-4ecb-9cbf-3b90660ba915/bin/uautomizer-UnR33cPsHg/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 137 Received shutdown request...