./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/termination-15/cstrspn_malloc.i --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 2329fc70 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/termination-15/cstrspn_malloc.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/config/svcomp-DerefFreeMemtrack-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 64bit --witnessprinter.graph.data.programhash f55019e0bbd691300fed0d54b866c64772e1d73ec8a359d22e1dcd292c7e1531 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-2329fc7 [2022-12-14 11:26:39,147 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 11:26:39,148 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 11:26:39,166 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 11:26:39,167 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 11:26:39,167 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 11:26:39,169 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 11:26:39,170 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 11:26:39,171 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 11:26:39,172 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 11:26:39,173 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 11:26:39,174 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 11:26:39,174 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 11:26:39,175 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 11:26:39,176 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 11:26:39,177 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 11:26:39,178 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 11:26:39,179 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 11:26:39,180 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 11:26:39,182 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 11:26:39,183 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 11:26:39,185 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 11:26:39,186 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 11:26:39,186 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 11:26:39,189 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 11:26:39,190 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 11:26:39,190 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 11:26:39,191 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 11:26:39,191 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 11:26:39,192 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 11:26:39,192 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 11:26:39,193 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 11:26:39,193 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 11:26:39,194 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 11:26:39,195 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 11:26:39,195 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 11:26:39,195 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 11:26:39,196 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 11:26:39,196 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 11:26:39,196 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 11:26:39,197 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 11:26:39,198 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/config/svcomp-DerefFreeMemtrack-64bit-Taipan_Default.epf [2022-12-14 11:26:39,217 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 11:26:39,217 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 11:26:39,218 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 11:26:39,218 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 11:26:39,219 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 11:26:39,219 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 11:26:39,219 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 11:26:39,219 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 11:26:39,219 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 11:26:39,220 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 11:26:39,220 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 11:26:39,220 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 11:26:39,220 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 11:26:39,220 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 11:26:39,221 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 11:26:39,221 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 11:26:39,221 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 11:26:39,221 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 11:26:39,222 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-12-14 11:26:39,222 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-12-14 11:26:39,222 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 11:26:39,222 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-12-14 11:26:39,223 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 11:26:39,223 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 11:26:39,223 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-12-14 11:26:39,223 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-12-14 11:26:39,223 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2022-12-14 11:26:39,224 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 11:26:39,224 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-12-14 11:26:39,224 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 11:26:39,224 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 11:26:39,224 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 11:26:39,225 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 11:26:39,225 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 11:26:39,225 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 11:26:39,225 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 11:26:39,225 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 11:26:39,225 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 11:26:39,226 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 11:26:39,226 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_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> f55019e0bbd691300fed0d54b866c64772e1d73ec8a359d22e1dcd292c7e1531 [2022-12-14 11:26:39,421 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 11:26:39,442 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 11:26:39,444 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 11:26:39,445 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 11:26:39,445 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 11:26:39,446 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/termination-15/cstrspn_malloc.i [2022-12-14 11:26:42,099 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 11:26:42,270 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 11:26:42,270 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/sv-benchmarks/c/termination-15/cstrspn_malloc.i [2022-12-14 11:26:42,276 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/data/426e01052/b2e420ac45f147cfbf13849039a6104b/FLAGe8d9e0eb2 [2022-12-14 11:26:42,286 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/data/426e01052/b2e420ac45f147cfbf13849039a6104b [2022-12-14 11:26:42,289 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 11:26:42,290 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 11:26:42,291 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 11:26:42,291 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 11:26:42,294 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 11:26:42,294 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 11:26:42" (1/1) ... [2022-12-14 11:26:42,295 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@43ac8931 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:26:42, skipping insertion in model container [2022-12-14 11:26:42,295 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 11:26:42" (1/1) ... [2022-12-14 11:26:42,301 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 11:26:42,319 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 11:26:42,509 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 11:26:42,516 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 11:26:42,542 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 11:26:42,561 INFO L208 MainTranslator]: Completed translation [2022-12-14 11:26:42,561 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:26:42 WrapperNode [2022-12-14 11:26:42,561 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 11:26:42,562 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 11:26:42,562 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 11:26:42,562 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 11:26:42,568 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:26:42" (1/1) ... [2022-12-14 11:26:42,576 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:26:42" (1/1) ... [2022-12-14 11:26:42,593 INFO L138 Inliner]: procedures = 152, calls = 14, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 83 [2022-12-14 11:26:42,593 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 11:26:42,594 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 11:26:42,594 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 11:26:42,594 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 11:26:42,601 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:26:42" (1/1) ... [2022-12-14 11:26:42,601 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:26:42" (1/1) ... [2022-12-14 11:26:42,603 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:26:42" (1/1) ... [2022-12-14 11:26:42,603 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:26:42" (1/1) ... [2022-12-14 11:26:42,607 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:26:42" (1/1) ... [2022-12-14 11:26:42,609 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:26:42" (1/1) ... [2022-12-14 11:26:42,610 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:26:42" (1/1) ... [2022-12-14 11:26:42,611 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:26:42" (1/1) ... [2022-12-14 11:26:42,612 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 11:26:42,613 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 11:26:42,613 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 11:26:42,613 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 11:26:42,614 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:26:42" (1/1) ... [2022-12-14 11:26:42,619 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 11:26:42,629 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 11:26:42,641 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 11:26:42,643 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 11:26:42,677 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-12-14 11:26:42,677 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-12-14 11:26:42,678 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-12-14 11:26:42,678 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-12-14 11:26:42,678 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 11:26:42,678 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 11:26:42,747 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 11:26:42,749 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 11:26:42,927 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 11:26:42,965 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 11:26:42,965 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-12-14 11:26:42,967 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 11:26:42 BoogieIcfgContainer [2022-12-14 11:26:42,967 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 11:26:42,970 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 11:26:42,970 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 11:26:42,973 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 11:26:42,973 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 11:26:42" (1/3) ... [2022-12-14 11:26:42,974 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@39c88eba and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 11:26:42, skipping insertion in model container [2022-12-14 11:26:42,974 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:26:42" (2/3) ... [2022-12-14 11:26:42,975 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@39c88eba and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 11:26:42, skipping insertion in model container [2022-12-14 11:26:42,975 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 11:26:42" (3/3) ... [2022-12-14 11:26:42,976 INFO L112 eAbstractionObserver]: Analyzing ICFG cstrspn_malloc.i [2022-12-14 11:26:42,995 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 11:26:42,996 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 21 error locations. [2022-12-14 11:26:43,030 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 11:26:43,034 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=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, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@7dfbed7a, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 11:26:43,035 INFO L358 AbstractCegarLoop]: Starting to check reachability of 21 error locations. [2022-12-14 11:26:43,038 INFO L276 IsEmpty]: Start isEmpty. Operand has 43 states, 21 states have (on average 2.2857142857142856) internal successors, (48), 42 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:43,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2022-12-14 11:26:43,042 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:26:43,042 INFO L195 NwaCegarLoop]: trace histogram [1, 1] [2022-12-14 11:26:43,042 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-12-14 11:26:43,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:26:43,046 INFO L85 PathProgramCache]: Analyzing trace with hash 4295, now seen corresponding path program 1 times [2022-12-14 11:26:43,053 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:26:43,053 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [958632424] [2022-12-14 11:26:43,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:26:43,054 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:26:43,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:26:43,327 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:26:43,328 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:26:43,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [958632424] [2022-12-14 11:26:43,329 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [958632424] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 11:26:43,329 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 11:26:43,329 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-12-14 11:26:43,331 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1023262876] [2022-12-14 11:26:43,332 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 11:26:43,336 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 11:26:43,336 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:26:43,365 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 11:26:43,365 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 11:26:43,367 INFO L87 Difference]: Start difference. First operand has 43 states, 21 states have (on average 2.2857142857142856) internal successors, (48), 42 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:43,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:26:43,421 INFO L93 Difference]: Finished difference Result 41 states and 44 transitions. [2022-12-14 11:26:43,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 11:26:43,423 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 2 [2022-12-14 11:26:43,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:26:43,431 INFO L225 Difference]: With dead ends: 41 [2022-12-14 11:26:43,431 INFO L226 Difference]: Without dead ends: 40 [2022-12-14 11:26:43,432 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 11:26:43,434 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 34 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 11:26:43,435 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 28 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 11:26:43,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-12-14 11:26:43,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2022-12-14 11:26:43,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 21 states have (on average 2.0476190476190474) internal successors, (43), 39 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:43,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2022-12-14 11:26:43,460 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 2 [2022-12-14 11:26:43,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:26:43,461 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2022-12-14 11:26:43,461 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:43,461 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2022-12-14 11:26:43,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2022-12-14 11:26:43,461 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:26:43,462 INFO L195 NwaCegarLoop]: trace histogram [1, 1] [2022-12-14 11:26:43,462 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-12-14 11:26:43,462 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-12-14 11:26:43,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:26:43,463 INFO L85 PathProgramCache]: Analyzing trace with hash 4296, now seen corresponding path program 1 times [2022-12-14 11:26:43,463 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:26:43,463 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [73085910] [2022-12-14 11:26:43,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:26:43,464 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:26:43,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:26:43,636 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:26:43,636 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:26:43,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [73085910] [2022-12-14 11:26:43,636 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [73085910] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 11:26:43,636 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 11:26:43,636 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-12-14 11:26:43,637 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1932381642] [2022-12-14 11:26:43,637 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 11:26:43,637 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 11:26:43,638 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:26:43,638 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 11:26:43,638 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 11:26:43,638 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:43,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:26:43,671 INFO L93 Difference]: Finished difference Result 38 states and 41 transitions. [2022-12-14 11:26:43,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 11:26:43,672 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 2 [2022-12-14 11:26:43,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:26:43,672 INFO L225 Difference]: With dead ends: 38 [2022-12-14 11:26:43,672 INFO L226 Difference]: Without dead ends: 38 [2022-12-14 11:26:43,673 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 11:26:43,674 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 40 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 11:26:43,674 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 22 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 11:26:43,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-12-14 11:26:43,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2022-12-14 11:26:43,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 21 states have (on average 1.9523809523809523) internal successors, (41), 37 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:43,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 41 transitions. [2022-12-14 11:26:43,677 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 41 transitions. Word has length 2 [2022-12-14 11:26:43,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:26:43,677 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 41 transitions. [2022-12-14 11:26:43,677 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:43,677 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 41 transitions. [2022-12-14 11:26:43,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2022-12-14 11:26:43,678 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:26:43,678 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2022-12-14 11:26:43,678 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-12-14 11:26:43,678 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-12-14 11:26:43,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:26:43,679 INFO L85 PathProgramCache]: Analyzing trace with hash 133134, now seen corresponding path program 1 times [2022-12-14 11:26:43,679 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:26:43,679 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1249344415] [2022-12-14 11:26:43,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:26:43,679 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:26:43,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:26:43,704 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:26:43,704 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:26:43,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1249344415] [2022-12-14 11:26:43,704 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1249344415] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 11:26:43,704 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 11:26:43,705 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-12-14 11:26:43,705 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2042619092] [2022-12-14 11:26:43,705 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 11:26:43,705 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 11:26:43,705 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:26:43,706 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 11:26:43,706 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 11:26:43,706 INFO L87 Difference]: Start difference. First operand 38 states and 41 transitions. Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:43,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:26:43,732 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2022-12-14 11:26:43,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 11:26:43,732 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2022-12-14 11:26:43,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:26:43,733 INFO L225 Difference]: With dead ends: 37 [2022-12-14 11:26:43,733 INFO L226 Difference]: Without dead ends: 37 [2022-12-14 11:26:43,733 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 11:26:43,734 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 30 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 11:26:43,734 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [30 Valid, 26 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 11:26:43,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-12-14 11:26:43,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2022-12-14 11:26:43,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 36 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:43,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2022-12-14 11:26:43,737 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 3 [2022-12-14 11:26:43,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:26:43,738 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2022-12-14 11:26:43,738 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:43,738 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2022-12-14 11:26:43,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2022-12-14 11:26:43,738 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:26:43,738 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2022-12-14 11:26:43,738 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-12-14 11:26:43,739 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-12-14 11:26:43,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:26:43,739 INFO L85 PathProgramCache]: Analyzing trace with hash 133135, now seen corresponding path program 1 times [2022-12-14 11:26:43,739 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:26:43,739 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1596491461] [2022-12-14 11:26:43,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:26:43,740 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:26:43,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:26:43,837 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:26:43,837 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:26:43,837 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1596491461] [2022-12-14 11:26:43,837 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1596491461] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 11:26:43,838 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 11:26:43,838 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-12-14 11:26:43,838 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [639199323] [2022-12-14 11:26:43,838 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 11:26:43,838 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 11:26:43,838 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:26:43,839 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 11:26:43,839 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 11:26:43,839 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:43,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:26:43,877 INFO L93 Difference]: Finished difference Result 35 states and 38 transitions. [2022-12-14 11:26:43,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 11:26:43,878 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2022-12-14 11:26:43,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:26:43,879 INFO L225 Difference]: With dead ends: 35 [2022-12-14 11:26:43,879 INFO L226 Difference]: Without dead ends: 35 [2022-12-14 11:26:43,879 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 11:26:43,880 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 36 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 11:26:43,881 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 19 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 11:26:43,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-12-14 11:26:43,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2022-12-14 11:26:43,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 34 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:43,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 38 transitions. [2022-12-14 11:26:43,884 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 38 transitions. Word has length 3 [2022-12-14 11:26:43,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:26:43,884 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 38 transitions. [2022-12-14 11:26:43,885 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:43,885 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 38 transitions. [2022-12-14 11:26:43,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2022-12-14 11:26:43,885 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:26:43,885 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2022-12-14 11:26:43,885 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-12-14 11:26:43,886 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-12-14 11:26:43,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:26:43,886 INFO L85 PathProgramCache]: Analyzing trace with hash 4129692, now seen corresponding path program 1 times [2022-12-14 11:26:43,886 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:26:43,887 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [648559950] [2022-12-14 11:26:43,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:26:43,887 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:26:43,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:26:43,931 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:26:43,931 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:26:43,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [648559950] [2022-12-14 11:26:43,931 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [648559950] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 11:26:43,932 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 11:26:43,932 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 11:26:43,932 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1965376768] [2022-12-14 11:26:43,932 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 11:26:43,932 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 11:26:43,932 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:26:43,933 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 11:26:43,933 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-12-14 11:26:43,933 INFO L87 Difference]: Start difference. First operand 35 states and 38 transitions. Second operand has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:43,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:26:43,971 INFO L93 Difference]: Finished difference Result 33 states and 36 transitions. [2022-12-14 11:26:43,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 11:26:43,972 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2022-12-14 11:26:43,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:26:43,972 INFO L225 Difference]: With dead ends: 33 [2022-12-14 11:26:43,972 INFO L226 Difference]: Without dead ends: 33 [2022-12-14 11:26:43,972 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-12-14 11:26:43,973 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 52 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 11:26:43,973 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [52 Valid, 25 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 11:26:43,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-12-14 11:26:43,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2022-12-14 11:26:43,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 21 states have (on average 1.7142857142857142) internal successors, (36), 32 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:43,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 36 transitions. [2022-12-14 11:26:43,976 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 36 transitions. Word has length 4 [2022-12-14 11:26:43,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:26:43,976 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 36 transitions. [2022-12-14 11:26:43,976 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:43,977 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 36 transitions. [2022-12-14 11:26:43,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2022-12-14 11:26:43,977 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:26:43,977 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2022-12-14 11:26:43,977 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-12-14 11:26:43,977 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-12-14 11:26:43,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:26:43,978 INFO L85 PathProgramCache]: Analyzing trace with hash 4129693, now seen corresponding path program 1 times [2022-12-14 11:26:43,978 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:26:43,978 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1136157998] [2022-12-14 11:26:43,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:26:43,979 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:26:43,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:26:44,039 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:26:44,040 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:26:44,040 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1136157998] [2022-12-14 11:26:44,040 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1136157998] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 11:26:44,040 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 11:26:44,040 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 11:26:44,040 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1262896659] [2022-12-14 11:26:44,040 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 11:26:44,041 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 11:26:44,041 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:26:44,041 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 11:26:44,042 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-12-14 11:26:44,042 INFO L87 Difference]: Start difference. First operand 33 states and 36 transitions. Second operand has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:44,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:26:44,100 INFO L93 Difference]: Finished difference Result 61 states and 67 transitions. [2022-12-14 11:26:44,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 11:26:44,101 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2022-12-14 11:26:44,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:26:44,102 INFO L225 Difference]: With dead ends: 61 [2022-12-14 11:26:44,102 INFO L226 Difference]: Without dead ends: 61 [2022-12-14 11:26:44,102 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2022-12-14 11:26:44,103 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 160 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 160 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 11:26:44,104 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [160 Valid, 32 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 11:26:44,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2022-12-14 11:26:44,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 36. [2022-12-14 11:26:44,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 24 states have (on average 1.6666666666666667) internal successors, (40), 35 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:44,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 40 transitions. [2022-12-14 11:26:44,107 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 40 transitions. Word has length 4 [2022-12-14 11:26:44,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:26:44,107 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 40 transitions. [2022-12-14 11:26:44,107 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:44,107 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 40 transitions. [2022-12-14 11:26:44,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-12-14 11:26:44,107 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:26:44,107 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-12-14 11:26:44,108 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-12-14 11:26:44,108 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-12-14 11:26:44,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:26:44,108 INFO L85 PathProgramCache]: Analyzing trace with hash -1526392209, now seen corresponding path program 1 times [2022-12-14 11:26:44,108 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:26:44,108 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [894598473] [2022-12-14 11:26:44,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:26:44,109 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:26:44,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:26:44,146 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:26:44,147 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:26:44,147 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [894598473] [2022-12-14 11:26:44,147 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [894598473] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 11:26:44,147 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 11:26:44,147 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 11:26:44,147 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1931177757] [2022-12-14 11:26:44,147 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 11:26:44,147 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 11:26:44,147 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:26:44,148 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 11:26:44,148 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-12-14 11:26:44,148 INFO L87 Difference]: Start difference. First operand 36 states and 40 transitions. Second operand has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:44,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:26:44,187 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2022-12-14 11:26:44,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 11:26:44,187 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-12-14 11:26:44,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:26:44,188 INFO L225 Difference]: With dead ends: 39 [2022-12-14 11:26:44,188 INFO L226 Difference]: Without dead ends: 39 [2022-12-14 11:26:44,188 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-12-14 11:26:44,189 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 42 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 11:26:44,189 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 37 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 11:26:44,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2022-12-14 11:26:44,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 33. [2022-12-14 11:26:44,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 24 states have (on average 1.5416666666666667) internal successors, (37), 32 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:44,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2022-12-14 11:26:44,191 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 7 [2022-12-14 11:26:44,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:26:44,191 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2022-12-14 11:26:44,192 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:44,192 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2022-12-14 11:26:44,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-12-14 11:26:44,192 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:26:44,192 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-12-14 11:26:44,192 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-12-14 11:26:44,192 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-12-14 11:26:44,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:26:44,193 INFO L85 PathProgramCache]: Analyzing trace with hash -1526392208, now seen corresponding path program 1 times [2022-12-14 11:26:44,193 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:26:44,193 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [553336578] [2022-12-14 11:26:44,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:26:44,193 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:26:44,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:26:44,302 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:26:44,302 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:26:44,302 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [553336578] [2022-12-14 11:26:44,302 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [553336578] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 11:26:44,302 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 11:26:44,303 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 11:26:44,303 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2098659060] [2022-12-14 11:26:44,303 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 11:26:44,303 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 11:26:44,303 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:26:44,304 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 11:26:44,304 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-12-14 11:26:44,304 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:44,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:26:44,391 INFO L93 Difference]: Finished difference Result 55 states and 62 transitions. [2022-12-14 11:26:44,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-12-14 11:26:44,392 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-12-14 11:26:44,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:26:44,393 INFO L225 Difference]: With dead ends: 55 [2022-12-14 11:26:44,393 INFO L226 Difference]: Without dead ends: 55 [2022-12-14 11:26:44,393 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2022-12-14 11:26:44,394 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 104 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 104 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 11:26:44,394 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [104 Valid, 32 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 11:26:44,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-12-14 11:26:44,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 38. [2022-12-14 11:26:44,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 29 states have (on average 1.5172413793103448) internal successors, (44), 37 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:44,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 44 transitions. [2022-12-14 11:26:44,397 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 44 transitions. Word has length 7 [2022-12-14 11:26:44,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:26:44,398 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 44 transitions. [2022-12-14 11:26:44,398 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:44,398 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 44 transitions. [2022-12-14 11:26:44,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-12-14 11:26:44,398 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:26:44,398 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 11:26:44,398 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-12-14 11:26:44,398 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr15ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-12-14 11:26:44,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:26:44,399 INFO L85 PathProgramCache]: Analyzing trace with hash 2013466919, now seen corresponding path program 1 times [2022-12-14 11:26:44,399 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:26:44,399 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [659491639] [2022-12-14 11:26:44,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:26:44,399 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:26:44,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:26:44,421 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:26:44,421 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:26:44,421 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [659491639] [2022-12-14 11:26:44,421 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [659491639] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 11:26:44,422 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 11:26:44,422 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-12-14 11:26:44,422 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1359387808] [2022-12-14 11:26:44,422 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 11:26:44,422 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 11:26:44,422 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:26:44,423 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 11:26:44,423 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 11:26:44,423 INFO L87 Difference]: Start difference. First operand 38 states and 44 transitions. Second operand has 3 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:44,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:26:44,438 INFO L93 Difference]: Finished difference Result 37 states and 43 transitions. [2022-12-14 11:26:44,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 11:26:44,439 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-12-14 11:26:44,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:26:44,439 INFO L225 Difference]: With dead ends: 37 [2022-12-14 11:26:44,439 INFO L226 Difference]: Without dead ends: 37 [2022-12-14 11:26:44,440 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 11:26:44,440 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 24 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 11:26:44,440 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 21 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 11:26:44,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-12-14 11:26:44,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2022-12-14 11:26:44,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 29 states have (on average 1.4827586206896552) internal successors, (43), 36 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:44,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 43 transitions. [2022-12-14 11:26:44,442 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 43 transitions. Word has length 9 [2022-12-14 11:26:44,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:26:44,443 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 43 transitions. [2022-12-14 11:26:44,443 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:44,443 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 43 transitions. [2022-12-14 11:26:44,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-12-14 11:26:44,443 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:26:44,443 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 11:26:44,443 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-12-14 11:26:44,443 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-12-14 11:26:44,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:26:44,444 INFO L85 PathProgramCache]: Analyzing trace with hash -1929813473, now seen corresponding path program 1 times [2022-12-14 11:26:44,444 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:26:44,444 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [387449091] [2022-12-14 11:26:44,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:26:44,444 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:26:44,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:26:44,463 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:26:44,463 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:26:44,463 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [387449091] [2022-12-14 11:26:44,463 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [387449091] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 11:26:44,463 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 11:26:44,464 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 11:26:44,464 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1748386385] [2022-12-14 11:26:44,464 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 11:26:44,464 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 11:26:44,464 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:26:44,465 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 11:26:44,465 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 11:26:44,465 INFO L87 Difference]: Start difference. First operand 37 states and 43 transitions. Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:44,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:26:44,481 INFO L93 Difference]: Finished difference Result 39 states and 45 transitions. [2022-12-14 11:26:44,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 11:26:44,482 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-12-14 11:26:44,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:26:44,482 INFO L225 Difference]: With dead ends: 39 [2022-12-14 11:26:44,482 INFO L226 Difference]: Without dead ends: 39 [2022-12-14 11:26:44,483 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 11:26:44,483 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 0 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 11:26:44,484 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 47 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 11:26:44,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2022-12-14 11:26:44,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2022-12-14 11:26:44,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 31 states have (on average 1.4516129032258065) internal successors, (45), 38 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:44,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 45 transitions. [2022-12-14 11:26:44,486 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 45 transitions. Word has length 10 [2022-12-14 11:26:44,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:26:44,486 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 45 transitions. [2022-12-14 11:26:44,486 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:44,486 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 45 transitions. [2022-12-14 11:26:44,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-12-14 11:26:44,486 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:26:44,487 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 11:26:44,487 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2022-12-14 11:26:44,487 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-12-14 11:26:44,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:26:44,487 INFO L85 PathProgramCache]: Analyzing trace with hash 305180871, now seen corresponding path program 1 times [2022-12-14 11:26:44,487 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:26:44,487 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [213804626] [2022-12-14 11:26:44,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:26:44,487 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:26:44,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:26:44,726 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:26:44,727 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:26:44,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [213804626] [2022-12-14 11:26:44,727 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [213804626] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 11:26:44,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1001561466] [2022-12-14 11:26:44,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:26:44,727 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:26:44,727 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 11:26:44,728 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 11:26:44,729 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-12-14 11:26:44,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:26:44,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 26 conjunts are in the unsatisfiable core [2022-12-14 11:26:44,788 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 11:26:44,853 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 11:26:45,015 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 11:26:45,016 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 29 [2022-12-14 11:26:45,114 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:26:45,114 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 11:26:45,284 INFO L350 Elim1Store]: Elim1 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 11 [2022-12-14 11:26:45,290 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 20 [2022-12-14 11:26:45,295 INFO L350 Elim1Store]: Elim1 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 31 treesize of output 23 [2022-12-14 11:26:45,310 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:26:45,310 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1001561466] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 11:26:45,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [480675226] [2022-12-14 11:26:45,328 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 11:26:45,328 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 11:26:45,333 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 11:26:45,338 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 11:26:45,338 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 11:26:45,375 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 11:26:45,376 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-12-14 11:26:45,402 INFO L350 Elim1Store]: Elim1 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 14 treesize of output 10 [2022-12-14 11:26:45,446 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 11:26:45,447 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 24 [2022-12-14 11:26:45,773 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 11:26:46,921 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '951#(and (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (= |#NULL.base| 0))' at error location [2022-12-14 11:26:46,921 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 11:26:46,921 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 11:26:46,921 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 16 [2022-12-14 11:26:46,921 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [402216476] [2022-12-14 11:26:46,921 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 11:26:46,922 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-12-14 11:26:46,922 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:26:46,922 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-12-14 11:26:46,922 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=538, Unknown=0, NotChecked=0, Total=650 [2022-12-14 11:26:46,922 INFO L87 Difference]: Start difference. First operand 39 states and 45 transitions. Second operand has 18 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 17 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:47,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:26:47,388 INFO L93 Difference]: Finished difference Result 104 states and 114 transitions. [2022-12-14 11:26:47,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-12-14 11:26:47,388 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 17 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-12-14 11:26:47,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:26:47,390 INFO L225 Difference]: With dead ends: 104 [2022-12-14 11:26:47,390 INFO L226 Difference]: Without dead ends: 104 [2022-12-14 11:26:47,390 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 11 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 237 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=223, Invalid=899, Unknown=0, NotChecked=0, Total=1122 [2022-12-14 11:26:47,390 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 396 mSDsluCounter, 218 mSDsCounter, 0 mSdLazyCounter, 210 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 396 SdHoareTripleChecker+Valid, 269 SdHoareTripleChecker+Invalid, 218 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 210 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 11:26:47,391 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [396 Valid, 269 Invalid, 218 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 210 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 11:26:47,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2022-12-14 11:26:47,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 36. [2022-12-14 11:26:47,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 30 states have (on average 1.4) internal successors, (42), 35 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:47,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 42 transitions. [2022-12-14 11:26:47,393 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 42 transitions. Word has length 11 [2022-12-14 11:26:47,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:26:47,394 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 42 transitions. [2022-12-14 11:26:47,394 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 17 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:47,394 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 42 transitions. [2022-12-14 11:26:47,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-12-14 11:26:47,394 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:26:47,394 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 11:26:47,400 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-12-14 11:26:47,595 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-12-14 11:26:47,596 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-12-14 11:26:47,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:26:47,598 INFO L85 PathProgramCache]: Analyzing trace with hash 875086992, now seen corresponding path program 1 times [2022-12-14 11:26:47,598 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:26:47,599 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [295618868] [2022-12-14 11:26:47,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:26:47,599 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:26:47,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:26:47,761 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:26:47,762 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:26:47,762 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [295618868] [2022-12-14 11:26:47,762 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [295618868] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 11:26:47,762 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 11:26:47,762 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-12-14 11:26:47,762 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1074594463] [2022-12-14 11:26:47,762 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 11:26:47,762 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-12-14 11:26:47,763 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:26:47,763 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-12-14 11:26:47,763 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2022-12-14 11:26:47,763 INFO L87 Difference]: Start difference. First operand 36 states and 42 transitions. Second operand has 8 states, 8 states have (on average 1.5) internal successors, (12), 8 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:47,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:26:47,848 INFO L93 Difference]: Finished difference Result 72 states and 75 transitions. [2022-12-14 11:26:47,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-12-14 11:26:47,849 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.5) internal successors, (12), 8 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-12-14 11:26:47,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:26:47,849 INFO L225 Difference]: With dead ends: 72 [2022-12-14 11:26:47,849 INFO L226 Difference]: Without dead ends: 72 [2022-12-14 11:26:47,849 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=110, Unknown=0, NotChecked=0, Total=156 [2022-12-14 11:26:47,850 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 108 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 88 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 11:26:47,850 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [108 Valid, 137 Invalid, 88 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 11:26:47,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2022-12-14 11:26:47,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 38. [2022-12-14 11:26:47,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 32 states have (on average 1.375) internal successors, (44), 37 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:47,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 44 transitions. [2022-12-14 11:26:47,852 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 44 transitions. Word has length 12 [2022-12-14 11:26:47,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:26:47,852 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 44 transitions. [2022-12-14 11:26:47,852 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.5) internal successors, (12), 8 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:47,852 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 44 transitions. [2022-12-14 11:26:47,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-12-14 11:26:47,852 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:26:47,852 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 11:26:47,853 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2022-12-14 11:26:47,853 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr18ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-12-14 11:26:47,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:26:47,853 INFO L85 PathProgramCache]: Analyzing trace with hash -320157746, now seen corresponding path program 1 times [2022-12-14 11:26:47,853 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:26:47,853 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1236113657] [2022-12-14 11:26:47,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:26:47,853 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:26:47,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:26:47,872 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:26:47,872 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:26:47,872 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1236113657] [2022-12-14 11:26:47,872 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1236113657] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 11:26:47,873 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 11:26:47,873 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-12-14 11:26:47,873 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [246026546] [2022-12-14 11:26:47,873 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 11:26:47,873 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 11:26:47,873 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:26:47,874 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 11:26:47,874 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 11:26:47,874 INFO L87 Difference]: Start difference. First operand 38 states and 44 transitions. Second operand has 3 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:47,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:26:47,885 INFO L93 Difference]: Finished difference Result 37 states and 43 transitions. [2022-12-14 11:26:47,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 11:26:47,885 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-12-14 11:26:47,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:26:47,885 INFO L225 Difference]: With dead ends: 37 [2022-12-14 11:26:47,886 INFO L226 Difference]: Without dead ends: 37 [2022-12-14 11:26:47,886 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 11:26:47,886 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 18 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 10 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 11:26:47,887 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 19 Invalid, 10 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 11:26:47,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-12-14 11:26:47,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2022-12-14 11:26:47,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 32 states have (on average 1.34375) internal successors, (43), 36 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:47,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 43 transitions. [2022-12-14 11:26:47,890 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 43 transitions. Word has length 12 [2022-12-14 11:26:47,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:26:47,890 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 43 transitions. [2022-12-14 11:26:47,890 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:47,890 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 43 transitions. [2022-12-14 11:26:47,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-12-14 11:26:47,891 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:26:47,891 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 11:26:47,891 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2022-12-14 11:26:47,891 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-12-14 11:26:47,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:26:47,891 INFO L85 PathProgramCache]: Analyzing trace with hash 1221003576, now seen corresponding path program 1 times [2022-12-14 11:26:47,891 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:26:47,891 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2125907685] [2022-12-14 11:26:47,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:26:47,892 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:26:47,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:26:48,087 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:26:48,087 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:26:48,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2125907685] [2022-12-14 11:26:48,087 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2125907685] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 11:26:48,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [294208383] [2022-12-14 11:26:48,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:26:48,087 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:26:48,087 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 11:26:48,088 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 11:26:48,089 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-12-14 11:26:48,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:26:48,142 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 38 conjunts are in the unsatisfiable core [2022-12-14 11:26:48,144 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 11:26:48,150 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-12-14 11:26:48,169 INFO L350 Elim1Store]: Elim1 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 14 treesize of output 10 [2022-12-14 11:26:48,217 INFO L350 Elim1Store]: Elim1 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 17 treesize of output 19 [2022-12-14 11:26:48,263 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 11:26:48,263 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 19 [2022-12-14 11:26:48,342 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:26:48,343 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 11:26:48,511 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 11:26:48,511 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 22 [2022-12-14 11:26:48,520 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 11:26:48,521 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 34 [2022-12-14 11:26:48,529 INFO L350 Elim1Store]: Elim1 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 [2022-12-14 11:26:48,536 INFO L350 Elim1Store]: Elim1 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 16 treesize of output 12 [2022-12-14 11:26:48,578 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:26:48,579 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [294208383] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 11:26:48,579 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [325255066] [2022-12-14 11:26:48,581 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 11:26:48,581 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 11:26:48,581 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 11:26:48,581 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 11:26:48,582 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 11:26:48,606 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 11:26:48,607 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-12-14 11:26:48,638 INFO L350 Elim1Store]: Elim1 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 14 treesize of output 10 [2022-12-14 11:26:48,672 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 11:26:48,673 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 24 [2022-12-14 11:26:49,053 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 11:26:49,700 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1411#(and (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (+ |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 1)) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (= |#NULL.base| 0))' at error location [2022-12-14 11:26:49,700 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 11:26:49,700 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 11:26:49,700 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 17 [2022-12-14 11:26:49,700 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1054725700] [2022-12-14 11:26:49,700 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 11:26:49,701 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-12-14 11:26:49,701 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:26:49,701 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-12-14 11:26:49,701 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=659, Unknown=0, NotChecked=0, Total=756 [2022-12-14 11:26:49,701 INFO L87 Difference]: Start difference. First operand 37 states and 43 transitions. Second operand has 19 states, 18 states have (on average 1.8333333333333333) internal successors, (33), 18 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:50,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:26:50,100 INFO L93 Difference]: Finished difference Result 101 states and 115 transitions. [2022-12-14 11:26:50,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-12-14 11:26:50,100 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 1.8333333333333333) internal successors, (33), 18 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-12-14 11:26:50,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:26:50,101 INFO L225 Difference]: With dead ends: 101 [2022-12-14 11:26:50,101 INFO L226 Difference]: Without dead ends: 101 [2022-12-14 11:26:50,101 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=195, Invalid=995, Unknown=0, NotChecked=0, Total=1190 [2022-12-14 11:26:50,101 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 468 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 250 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 468 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 257 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 250 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 11:26:50,102 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [468 Valid, 100 Invalid, 257 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 250 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 11:26:50,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-12-14 11:26:50,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 48. [2022-12-14 11:26:50,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 44 states have (on average 1.3636363636363635) internal successors, (60), 47 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:50,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 60 transitions. [2022-12-14 11:26:50,104 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 60 transitions. Word has length 13 [2022-12-14 11:26:50,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:26:50,104 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 60 transitions. [2022-12-14 11:26:50,104 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 1.8333333333333333) internal successors, (33), 18 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:50,104 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 60 transitions. [2022-12-14 11:26:50,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-12-14 11:26:50,104 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:26:50,104 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 11:26:50,109 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-12-14 11:26:50,305 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-12-14 11:26:50,306 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr19ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-12-14 11:26:50,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:26:50,307 INFO L85 PathProgramCache]: Analyzing trace with hash -1334955413, now seen corresponding path program 1 times [2022-12-14 11:26:50,308 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:26:50,308 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [251815616] [2022-12-14 11:26:50,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:26:50,309 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:26:50,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:26:50,391 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:26:50,391 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:26:50,391 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [251815616] [2022-12-14 11:26:50,391 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [251815616] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 11:26:50,391 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 11:26:50,391 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-12-14 11:26:50,391 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [473027849] [2022-12-14 11:26:50,392 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 11:26:50,392 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 11:26:50,392 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:26:50,392 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 11:26:50,392 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-12-14 11:26:50,393 INFO L87 Difference]: Start difference. First operand 48 states and 60 transitions. Second operand has 4 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:50,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:26:50,408 INFO L93 Difference]: Finished difference Result 47 states and 59 transitions. [2022-12-14 11:26:50,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 11:26:50,409 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-12-14 11:26:50,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:26:50,409 INFO L225 Difference]: With dead ends: 47 [2022-12-14 11:26:50,410 INFO L226 Difference]: Without dead ends: 47 [2022-12-14 11:26:50,410 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-12-14 11:26:50,410 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 28 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 11:26:50,411 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 14 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 11:26:50,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-12-14 11:26:50,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2022-12-14 11:26:50,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 44 states have (on average 1.3409090909090908) internal successors, (59), 46 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:50,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 59 transitions. [2022-12-14 11:26:50,413 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 59 transitions. Word has length 13 [2022-12-14 11:26:50,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:26:50,413 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 59 transitions. [2022-12-14 11:26:50,413 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:50,413 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 59 transitions. [2022-12-14 11:26:50,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-12-14 11:26:50,414 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:26:50,414 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 11:26:50,414 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2022-12-14 11:26:50,414 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr20ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-12-14 11:26:50,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:26:50,415 INFO L85 PathProgramCache]: Analyzing trace with hash 1566055281, now seen corresponding path program 1 times [2022-12-14 11:26:50,415 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:26:50,415 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1264453602] [2022-12-14 11:26:50,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:26:50,415 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:26:50,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:26:50,540 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:26:50,540 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:26:50,540 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1264453602] [2022-12-14 11:26:50,541 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1264453602] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 11:26:50,541 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 11:26:50,541 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-12-14 11:26:50,541 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [6063403] [2022-12-14 11:26:50,541 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 11:26:50,541 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-12-14 11:26:50,541 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:26:50,542 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-12-14 11:26:50,542 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-12-14 11:26:50,542 INFO L87 Difference]: Start difference. First operand 47 states and 59 transitions. Second operand has 6 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:50,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:26:50,603 INFO L93 Difference]: Finished difference Result 46 states and 58 transitions. [2022-12-14 11:26:50,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-12-14 11:26:50,603 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-12-14 11:26:50,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:26:50,603 INFO L225 Difference]: With dead ends: 46 [2022-12-14 11:26:50,604 INFO L226 Difference]: Without dead ends: 34 [2022-12-14 11:26:50,604 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2022-12-14 11:26:50,604 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 30 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 11:26:50,604 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [30 Valid, 38 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 11:26:50,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-12-14 11:26:50,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2022-12-14 11:26:50,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 32 states have (on average 1.21875) internal successors, (39), 33 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:50,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2022-12-14 11:26:50,607 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 14 [2022-12-14 11:26:50,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:26:50,607 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2022-12-14 11:26:50,607 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:26:50,607 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2022-12-14 11:26:50,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-12-14 11:26:50,607 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:26:50,607 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 11:26:50,608 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2022-12-14 11:26:50,608 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-12-14 11:26:50,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:26:50,608 INFO L85 PathProgramCache]: Analyzing trace with hash 946553758, now seen corresponding path program 2 times [2022-12-14 11:26:50,608 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:26:50,608 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1137553770] [2022-12-14 11:26:50,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:26:50,609 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:26:50,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:26:50,935 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:26:50,935 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:26:50,935 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1137553770] [2022-12-14 11:26:50,935 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1137553770] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 11:26:50,936 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [383542562] [2022-12-14 11:26:50,936 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 11:26:50,936 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:26:50,936 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 11:26:50,937 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 11:26:50,938 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-12-14 11:26:50,993 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-12-14 11:26:50,993 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 11:26:50,994 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 33 conjunts are in the unsatisfiable core [2022-12-14 11:26:50,996 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 11:26:51,014 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 11:26:52,384 INFO L321 Elim1Store]: treesize reduction 4, result has 87.9 percent of original size [2022-12-14 11:26:52,385 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 40 treesize of output 49 [2022-12-14 11:26:52,583 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:26:52,583 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 11:26:52,937 INFO L350 Elim1Store]: Elim1 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 27 treesize of output 23 [2022-12-14 11:26:52,946 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 11:26:52,946 INFO L350 Elim1Store]: Elim1 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 43 treesize of output 47 [2022-12-14 11:26:52,954 INFO L350 Elim1Store]: Elim1 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 83 treesize of output 65 [2022-12-14 11:26:52,977 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:26:52,978 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [383542562] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 11:26:52,978 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1970195078] [2022-12-14 11:26:52,980 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 11:26:52,980 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 11:26:52,980 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 11:26:52,980 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 11:26:52,980 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 11:26:52,995 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 11:26:52,996 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-12-14 11:26:53,018 INFO L350 Elim1Store]: Elim1 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 14 treesize of output 10 [2022-12-14 11:26:53,042 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 11:26:53,043 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 24 [2022-12-14 11:26:53,277 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 11:26:54,519 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1883#(and (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (= |#NULL.base| 0))' at error location [2022-12-14 11:26:54,519 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 11:26:54,519 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 11:26:54,519 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 10, 10] total 26 [2022-12-14 11:26:54,519 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [369063823] [2022-12-14 11:26:54,519 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 11:26:54,519 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-12-14 11:26:54,519 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:26:54,520 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-12-14 11:26:54,520 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=1098, Unknown=0, NotChecked=0, Total=1260 [2022-12-14 11:26:54,520 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand has 28 states, 27 states have (on average 1.5925925925925926) internal successors, (43), 27 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:27:00,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:27:00,264 INFO L93 Difference]: Finished difference Result 88 states and 99 transitions. [2022-12-14 11:27:00,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-12-14 11:27:00,265 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 1.5925925925925926) internal successors, (43), 27 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2022-12-14 11:27:00,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:27:00,265 INFO L225 Difference]: With dead ends: 88 [2022-12-14 11:27:00,265 INFO L226 Difference]: Without dead ends: 88 [2022-12-14 11:27:00,266 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 511 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=394, Invalid=1956, Unknown=2, NotChecked=0, Total=2352 [2022-12-14 11:27:00,267 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 306 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 294 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 306 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 302 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 294 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 11:27:00,267 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [306 Valid, 20 Invalid, 302 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 294 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 11:27:00,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-12-14 11:27:00,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 50. [2022-12-14 11:27:00,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 48 states have (on average 1.2291666666666667) internal successors, (59), 49 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:27:00,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 59 transitions. [2022-12-14 11:27:00,270 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 59 transitions. Word has length 15 [2022-12-14 11:27:00,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:27:00,271 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 59 transitions. [2022-12-14 11:27:00,271 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 1.5925925925925926) internal successors, (43), 27 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:27:00,271 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 59 transitions. [2022-12-14 11:27:00,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-12-14 11:27:00,271 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:27:00,272 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1] [2022-12-14 11:27:00,276 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-12-14 11:27:00,472 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-12-14 11:27:00,473 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-12-14 11:27:00,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:27:00,474 INFO L85 PathProgramCache]: Analyzing trace with hash 1894523389, now seen corresponding path program 2 times [2022-12-14 11:27:00,474 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:27:00,475 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [341924697] [2022-12-14 11:27:00,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:27:00,475 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:27:00,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:27:00,988 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:27:00,988 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:27:00,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [341924697] [2022-12-14 11:27:00,988 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [341924697] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 11:27:00,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [376720175] [2022-12-14 11:27:00,988 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 11:27:00,988 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:27:00,989 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 11:27:00,989 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 11:27:00,990 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-12-14 11:27:01,050 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-12-14 11:27:01,050 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 11:27:01,052 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 70 conjunts are in the unsatisfiable core [2022-12-14 11:27:01,054 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 11:27:01,059 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-12-14 11:27:01,085 INFO L350 Elim1Store]: Elim1 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 14 treesize of output 10 [2022-12-14 11:27:01,122 INFO L350 Elim1Store]: Elim1 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 16 treesize of output 18 [2022-12-14 11:27:01,671 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 11:27:01,680 INFO L321 Elim1Store]: treesize reduction 4, result has 78.9 percent of original size [2022-12-14 11:27:01,680 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 47 treesize of output 31 [2022-12-14 11:27:01,728 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:27:01,728 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 11:27:02,132 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 11:27:02,132 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 72 treesize of output 50 [2022-12-14 11:27:02,143 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 11:27:02,143 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 93 treesize of output 88 [2022-12-14 11:27:02,158 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 11:27:02,158 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 60 treesize of output 62 [2022-12-14 11:27:02,165 INFO L350 Elim1Store]: Elim1 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 16 treesize of output 12 [2022-12-14 11:27:02,239 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:27:02,239 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [376720175] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 11:27:02,239 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1845439566] [2022-12-14 11:27:02,241 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 11:27:02,241 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 11:27:02,241 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 11:27:02,241 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 11:27:02,242 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 11:27:02,260 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 11:27:02,261 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-12-14 11:27:02,280 INFO L350 Elim1Store]: Elim1 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 14 treesize of output 10 [2022-12-14 11:27:02,306 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 11:27:02,306 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 24 [2022-12-14 11:27:02,641 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 11:27:03,346 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2214#(and (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (+ |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 1)) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (= |#NULL.base| 0))' at error location [2022-12-14 11:27:03,346 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 11:27:03,346 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 11:27:03,346 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 12, 12] total 31 [2022-12-14 11:27:03,346 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [666266105] [2022-12-14 11:27:03,346 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 11:27:03,347 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-12-14 11:27:03,347 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:27:03,348 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-12-14 11:27:03,348 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=1547, Unknown=1, NotChecked=0, Total=1722 [2022-12-14 11:27:03,349 INFO L87 Difference]: Start difference. First operand 50 states and 59 transitions. Second operand has 33 states, 32 states have (on average 2.0625) internal successors, (66), 32 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:27:07,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:27:07,804 INFO L93 Difference]: Finished difference Result 199 states and 231 transitions. [2022-12-14 11:27:07,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-12-14 11:27:07,805 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 2.0625) internal successors, (66), 32 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2022-12-14 11:27:07,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:27:07,806 INFO L225 Difference]: With dead ends: 199 [2022-12-14 11:27:07,806 INFO L226 Difference]: Without dead ends: 199 [2022-12-14 11:27:07,807 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1339 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=926, Invalid=4623, Unknown=1, NotChecked=0, Total=5550 [2022-12-14 11:27:07,808 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 519 mSDsluCounter, 116 mSDsCounter, 0 mSdLazyCounter, 544 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 519 SdHoareTripleChecker+Valid, 122 SdHoareTripleChecker+Invalid, 563 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 544 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-12-14 11:27:07,808 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [519 Valid, 122 Invalid, 563 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 544 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-12-14 11:27:07,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2022-12-14 11:27:07,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 99. [2022-12-14 11:27:07,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 97 states have (on average 1.1958762886597938) internal successors, (116), 98 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:27:07,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 116 transitions. [2022-12-14 11:27:07,813 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 116 transitions. Word has length 22 [2022-12-14 11:27:07,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:27:07,813 INFO L495 AbstractCegarLoop]: Abstraction has 99 states and 116 transitions. [2022-12-14 11:27:07,813 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 32 states have (on average 2.0625) internal successors, (66), 32 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:27:07,813 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 116 transitions. [2022-12-14 11:27:07,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-12-14 11:27:07,814 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:27:07,814 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 11:27:07,818 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-12-14 11:27:08,015 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-12-14 11:27:08,016 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-12-14 11:27:08,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:27:08,017 INFO L85 PathProgramCache]: Analyzing trace with hash -1612423476, now seen corresponding path program 3 times [2022-12-14 11:27:08,018 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:27:08,018 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2081399066] [2022-12-14 11:27:08,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:27:08,019 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:27:08,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:27:08,423 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:27:08,423 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:27:08,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2081399066] [2022-12-14 11:27:08,424 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2081399066] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 11:27:08,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [567908969] [2022-12-14 11:27:08,424 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 11:27:08,424 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:27:08,424 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 11:27:08,425 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 11:27:08,426 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-12-14 11:27:08,488 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 11:27:08,488 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 11:27:08,490 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 51 conjunts are in the unsatisfiable core [2022-12-14 11:27:08,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 11:27:08,503 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-12-14 11:27:08,503 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2022-12-14 11:27:08,522 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 11:27:09,233 INFO L321 Elim1Store]: treesize reduction 12, result has 73.3 percent of original size [2022-12-14 11:27:09,233 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 6 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 62 treesize of output 61 [2022-12-14 11:27:09,351 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:27:09,351 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 11:27:10,026 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 59 treesize of output 51 [2022-12-14 11:27:10,034 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 77 [2022-12-14 11:27:10,093 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:27:10,093 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [567908969] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 11:27:10,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1567396270] [2022-12-14 11:27:10,094 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 11:27:10,095 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 11:27:10,095 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 11:27:10,095 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 11:27:10,095 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 11:27:10,109 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 11:27:10,109 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-12-14 11:27:10,125 INFO L350 Elim1Store]: Elim1 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 14 treesize of output 10 [2022-12-14 11:27:10,152 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 11:27:10,153 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 24 [2022-12-14 11:27:10,316 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 11:27:11,816 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2760#(and (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (= |#NULL.base| 0))' at error location [2022-12-14 11:27:11,816 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 11:27:11,816 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 11:27:11,816 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 15, 15] total 39 [2022-12-14 11:27:11,816 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1388926108] [2022-12-14 11:27:11,816 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 11:27:11,817 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-12-14 11:27:11,817 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:27:11,817 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-12-14 11:27:11,818 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=267, Invalid=2085, Unknown=0, NotChecked=0, Total=2352 [2022-12-14 11:27:11,818 INFO L87 Difference]: Start difference. First operand 99 states and 116 transitions. Second operand has 41 states, 40 states have (on average 1.725) internal successors, (69), 40 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:27:25,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:27:25,749 INFO L93 Difference]: Finished difference Result 248 states and 280 transitions. [2022-12-14 11:27:25,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-12-14 11:27:25,750 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 40 states have (on average 1.725) internal successors, (69), 40 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2022-12-14 11:27:25,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:27:25,750 INFO L225 Difference]: With dead ends: 248 [2022-12-14 11:27:25,750 INFO L226 Difference]: Without dead ends: 248 [2022-12-14 11:27:25,751 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1314 ImplicationChecksByTransitivity, 15.7s TimeCoverageRelationStatistics Valid=866, Invalid=4834, Unknown=0, NotChecked=0, Total=5700 [2022-12-14 11:27:25,752 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 608 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 946 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 608 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 954 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 946 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-12-14 11:27:25,752 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [608 Valid, 68 Invalid, 954 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 946 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-12-14 11:27:25,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2022-12-14 11:27:25,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 147. [2022-12-14 11:27:25,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 145 states have (on average 1.2137931034482758) internal successors, (176), 146 states have internal predecessors, (176), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:27:25,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 176 transitions. [2022-12-14 11:27:25,755 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 176 transitions. Word has length 23 [2022-12-14 11:27:25,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:27:25,755 INFO L495 AbstractCegarLoop]: Abstraction has 147 states and 176 transitions. [2022-12-14 11:27:25,756 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 40 states have (on average 1.725) internal successors, (69), 40 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:27:25,756 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 176 transitions. [2022-12-14 11:27:25,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-12-14 11:27:25,756 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:27:25,756 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1] [2022-12-14 11:27:25,762 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-12-14 11:27:25,957 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:27:25,958 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-12-14 11:27:25,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:27:25,960 INFO L85 PathProgramCache]: Analyzing trace with hash 1602372129, now seen corresponding path program 1 times [2022-12-14 11:27:25,960 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:27:25,961 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [856223072] [2022-12-14 11:27:25,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:27:25,962 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:27:26,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:27:26,726 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 11:27:26,726 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:27:26,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [856223072] [2022-12-14 11:27:26,726 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [856223072] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 11:27:26,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1813658861] [2022-12-14 11:27:26,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:27:26,726 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:27:26,727 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 11:27:26,727 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 11:27:26,728 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-12-14 11:27:26,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:27:26,805 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 73 conjunts are in the unsatisfiable core [2022-12-14 11:27:26,807 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 11:27:26,811 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-12-14 11:27:26,844 INFO L350 Elim1Store]: Elim1 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 14 treesize of output 10 [2022-12-14 11:27:26,909 INFO L350 Elim1Store]: Elim1 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 17 treesize of output 19 [2022-12-14 11:27:28,228 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 11:27:28,230 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 11:27:28,231 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 11:27:28,245 INFO L321 Elim1Store]: treesize reduction 30, result has 46.4 percent of original size [2022-12-14 11:27:28,245 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 4 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 7 case distinctions, treesize of input 56 treesize of output 46 [2022-12-14 11:27:28,333 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 11:27:28,333 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 11:27:29,288 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 11:27:29,288 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 129 treesize of output 74 [2022-12-14 11:27:29,321 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 11:27:29,322 INFO L350 Elim1Store]: Elim1 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 5 new quantified variables, introduced 7 case distinctions, treesize of input 210 treesize of output 243 [2022-12-14 11:27:29,350 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 11:27:29,350 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 135 treesize of output 135 [2022-12-14 11:27:29,362 INFO L350 Elim1Store]: Elim1 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 16 treesize of output 12 [2022-12-14 11:27:29,993 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 11:27:29,993 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1813658861] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 11:27:29,994 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [200954486] [2022-12-14 11:27:29,995 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 11:27:29,995 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 11:27:29,996 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 11:27:29,996 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 11:27:29,996 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 11:27:30,015 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 11:27:30,017 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-12-14 11:27:30,029 INFO L350 Elim1Store]: Elim1 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 14 treesize of output 10 [2022-12-14 11:27:30,058 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 11:27:30,059 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 24 [2022-12-14 11:27:31,020 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 11:27:32,539 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3469#(and (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (+ |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 1)) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (= |#NULL.base| 0))' at error location [2022-12-14 11:27:32,539 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 11:27:32,539 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 11:27:32,539 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 16, 16] total 46 [2022-12-14 11:27:32,539 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1623788082] [2022-12-14 11:27:32,539 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 11:27:32,539 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-12-14 11:27:32,539 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:27:32,540 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-12-14 11:27:32,540 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=2857, Unknown=9, NotChecked=0, Total=3080 [2022-12-14 11:27:32,540 INFO L87 Difference]: Start difference. First operand 147 states and 176 transitions. Second operand has 48 states, 47 states have (on average 2.0425531914893615) internal successors, (96), 47 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:27:43,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:27:43,243 INFO L93 Difference]: Finished difference Result 471 states and 562 transitions. [2022-12-14 11:27:43,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2022-12-14 11:27:43,244 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 47 states have (on average 2.0425531914893615) internal successors, (96), 47 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2022-12-14 11:27:43,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:27:43,245 INFO L225 Difference]: With dead ends: 471 [2022-12-14 11:27:43,246 INFO L226 Difference]: Without dead ends: 471 [2022-12-14 11:27:43,248 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 59 SyntacticMatches, 4 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2745 ImplicationChecksByTransitivity, 12.7s TimeCoverageRelationStatistics Valid=1565, Invalid=9346, Unknown=9, NotChecked=0, Total=10920 [2022-12-14 11:27:43,248 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 678 mSDsluCounter, 221 mSDsCounter, 0 mSdLazyCounter, 1146 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 678 SdHoareTripleChecker+Valid, 229 SdHoareTripleChecker+Invalid, 1172 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 1146 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-12-14 11:27:43,249 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [678 Valid, 229 Invalid, 1172 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 1146 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-12-14 11:27:43,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 471 states. [2022-12-14 11:27:43,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 471 to 262. [2022-12-14 11:27:43,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 260 states have (on average 1.2307692307692308) internal successors, (320), 261 states have internal predecessors, (320), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:27:43,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 320 transitions. [2022-12-14 11:27:43,258 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 320 transitions. Word has length 35 [2022-12-14 11:27:43,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:27:43,258 INFO L495 AbstractCegarLoop]: Abstraction has 262 states and 320 transitions. [2022-12-14 11:27:43,259 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 47 states have (on average 2.0425531914893615) internal successors, (96), 47 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:27:43,259 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 320 transitions. [2022-12-14 11:27:43,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-12-14 11:27:43,260 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:27:43,260 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1] [2022-12-14 11:27:43,264 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-12-14 11:27:43,460 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:27:43,462 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-12-14 11:27:43,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:27:43,463 INFO L85 PathProgramCache]: Analyzing trace with hash 389666863, now seen corresponding path program 2 times [2022-12-14 11:27:43,463 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:27:43,464 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1752286685] [2022-12-14 11:27:43,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:27:43,465 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:27:43,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:27:44,086 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 11:27:44,087 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:27:44,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1752286685] [2022-12-14 11:27:44,087 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1752286685] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 11:27:44,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [637445046] [2022-12-14 11:27:44,087 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 11:27:44,087 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:27:44,088 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 11:27:44,088 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 11:27:44,089 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-12-14 11:27:44,161 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-12-14 11:27:44,161 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 11:27:44,163 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 72 conjunts are in the unsatisfiable core [2022-12-14 11:27:44,166 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 11:27:44,172 INFO L350 Elim1Store]: Elim1 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 18 treesize of output 16 [2022-12-14 11:27:44,202 INFO L350 Elim1Store]: Elim1 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 14 treesize of output 10 [2022-12-14 11:27:44,254 INFO L350 Elim1Store]: Elim1 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 17 treesize of output 19 [2022-12-14 11:27:49,728 INFO L321 Elim1Store]: treesize reduction 8, result has 86.9 percent of original size [2022-12-14 11:27:49,729 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 1 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 52 treesize of output 73 [2022-12-14 11:27:49,967 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 11:27:49,967 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 11:27:53,413 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 11:27:53,414 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 70 treesize of output 48 [2022-12-14 11:27:53,445 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 11:27:53,445 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 89 treesize of output 130 [2022-12-14 11:27:53,480 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 11:27:53,480 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 63 treesize of output 95 [2022-12-14 11:27:53,490 INFO L350 Elim1Store]: Elim1 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 16 treesize of output 12 [2022-12-14 11:27:54,062 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 11:27:54,063 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [637445046] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 11:27:54,063 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [14852086] [2022-12-14 11:27:54,064 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 11:27:54,064 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 11:27:54,064 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 11:27:54,064 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 11:27:54,064 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 11:27:54,078 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 11:27:54,079 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-12-14 11:27:54,096 INFO L350 Elim1Store]: Elim1 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 14 treesize of output 10 [2022-12-14 11:27:54,116 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 11:27:54,117 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 24 [2022-12-14 11:27:55,047 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 11:27:56,373 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4560#(and (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (+ |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 1)) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (= |#NULL.base| 0))' at error location [2022-12-14 11:27:56,373 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 11:27:56,374 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 11:27:56,374 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 16, 16] total 46 [2022-12-14 11:27:56,374 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1233856872] [2022-12-14 11:27:56,374 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 11:27:56,374 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-12-14 11:27:56,374 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:27:56,374 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-12-14 11:27:56,375 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=227, Invalid=2838, Unknown=15, NotChecked=0, Total=3080 [2022-12-14 11:27:56,375 INFO L87 Difference]: Start difference. First operand 262 states and 320 transitions. Second operand has 48 states, 47 states have (on average 2.0425531914893615) internal successors, (96), 47 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:28:32,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:28:32,530 INFO L93 Difference]: Finished difference Result 896 states and 1074 transitions. [2022-12-14 11:28:32,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2022-12-14 11:28:32,530 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 47 states have (on average 2.0425531914893615) internal successors, (96), 47 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2022-12-14 11:28:32,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:28:32,533 INFO L225 Difference]: With dead ends: 896 [2022-12-14 11:28:32,533 INFO L226 Difference]: Without dead ends: 896 [2022-12-14 11:28:32,535 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 59 SyntacticMatches, 4 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5985 ImplicationChecksByTransitivity, 43.4s TimeCoverageRelationStatistics Valid=3486, Invalid=16800, Unknown=20, NotChecked=0, Total=20306 [2022-12-14 11:28:32,536 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 1232 mSDsluCounter, 161 mSDsCounter, 0 mSdLazyCounter, 1146 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1232 SdHoareTripleChecker+Valid, 167 SdHoareTripleChecker+Invalid, 1197 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 1146 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2022-12-14 11:28:32,536 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1232 Valid, 167 Invalid, 1197 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 1146 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2022-12-14 11:28:32,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 896 states. [2022-12-14 11:28:32,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 896 to 313. [2022-12-14 11:28:32,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 313 states, 311 states have (on average 1.2186495176848875) internal successors, (379), 312 states have internal predecessors, (379), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:28:32,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 313 states to 313 states and 379 transitions. [2022-12-14 11:28:32,547 INFO L78 Accepts]: Start accepts. Automaton has 313 states and 379 transitions. Word has length 35 [2022-12-14 11:28:32,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:28:32,548 INFO L495 AbstractCegarLoop]: Abstraction has 313 states and 379 transitions. [2022-12-14 11:28:32,548 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 47 states have (on average 2.0425531914893615) internal successors, (96), 47 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:28:32,548 INFO L276 IsEmpty]: Start isEmpty. Operand 313 states and 379 transitions. [2022-12-14 11:28:32,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-12-14 11:28:32,549 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:28:32,549 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1] [2022-12-14 11:28:32,553 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-12-14 11:28:32,750 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:28:32,751 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-12-14 11:28:32,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:28:32,752 INFO L85 PathProgramCache]: Analyzing trace with hash 769318584, now seen corresponding path program 3 times [2022-12-14 11:28:32,752 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:28:32,753 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1092563329] [2022-12-14 11:28:32,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:28:32,753 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:28:32,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:28:33,249 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-12-14 11:28:33,249 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:28:33,250 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1092563329] [2022-12-14 11:28:33,250 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1092563329] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 11:28:33,250 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1392896222] [2022-12-14 11:28:33,250 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 11:28:33,250 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:28:33,250 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 11:28:33,251 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 11:28:33,252 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-12-14 11:28:33,326 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 11:28:33,326 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 11:28:33,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 86 conjunts are in the unsatisfiable core [2022-12-14 11:28:33,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 11:28:33,334 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-12-14 11:28:33,353 INFO L350 Elim1Store]: Elim1 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 14 treesize of output 10 [2022-12-14 11:28:33,395 INFO L350 Elim1Store]: Elim1 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 17 treesize of output 19 [2022-12-14 11:28:34,684 INFO L321 Elim1Store]: treesize reduction 8, result has 68.0 percent of original size [2022-12-14 11:28:34,684 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 4 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 3 case distinctions, treesize of input 56 treesize of output 37 [2022-12-14 11:28:34,765 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 0 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:28:34,765 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 11:28:35,842 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 11:28:35,842 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 101 treesize of output 68 [2022-12-14 11:28:35,855 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 11:28:35,855 INFO L350 Elim1Store]: Elim1 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 4 new quantified variables, introduced 3 case distinctions, treesize of input 130 treesize of output 125 [2022-12-14 11:28:35,872 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 11:28:35,872 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 81 treesize of output 79 [2022-12-14 11:28:35,881 INFO L350 Elim1Store]: Elim1 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 16 treesize of output 12 [2022-12-14 11:28:35,964 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 0 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:28:35,965 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1392896222] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 11:28:35,965 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [809374180] [2022-12-14 11:28:35,966 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 11:28:35,966 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 11:28:35,967 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 11:28:35,967 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 11:28:35,967 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 11:28:35,983 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 11:28:35,983 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-12-14 11:28:35,998 INFO L350 Elim1Store]: Elim1 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 14 treesize of output 10 [2022-12-14 11:28:36,022 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 11:28:36,023 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 24 [2022-12-14 11:28:36,973 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 11:28:38,570 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6227#(and (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (+ |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 1)) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (= |#NULL.base| 0))' at error location [2022-12-14 11:28:38,570 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 11:28:38,570 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 11:28:38,570 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 19, 19] total 46 [2022-12-14 11:28:38,570 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [257619095] [2022-12-14 11:28:38,571 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 11:28:38,571 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-12-14 11:28:38,571 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:28:38,572 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-12-14 11:28:38,572 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=2773, Unknown=1, NotChecked=0, Total=3080 [2022-12-14 11:28:38,573 INFO L87 Difference]: Start difference. First operand 313 states and 379 transitions. Second operand has 48 states, 47 states have (on average 2.3617021276595747) internal successors, (111), 47 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:29:08,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:29:08,471 INFO L93 Difference]: Finished difference Result 1220 states and 1456 transitions. [2022-12-14 11:29:08,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 117 states. [2022-12-14 11:29:08,471 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 47 states have (on average 2.3617021276595747) internal successors, (111), 47 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2022-12-14 11:29:08,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:29:08,474 INFO L225 Difference]: With dead ends: 1220 [2022-12-14 11:29:08,474 INFO L226 Difference]: Without dead ends: 1220 [2022-12-14 11:29:08,477 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 64 SyntacticMatches, 5 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9584 ImplicationChecksByTransitivity, 30.4s TimeCoverageRelationStatistics Valid=4200, Invalid=24529, Unknown=1, NotChecked=0, Total=28730 [2022-12-14 11:29:08,477 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 1130 mSDsluCounter, 385 mSDsCounter, 0 mSdLazyCounter, 2307 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1130 SdHoareTripleChecker+Valid, 410 SdHoareTripleChecker+Invalid, 2347 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 2307 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2022-12-14 11:29:08,477 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1130 Valid, 410 Invalid, 2347 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 2307 Invalid, 0 Unknown, 0 Unchecked, 2.6s Time] [2022-12-14 11:29:08,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1220 states. [2022-12-14 11:29:08,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1220 to 646. [2022-12-14 11:29:08,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 646 states, 644 states have (on average 1.2096273291925466) internal successors, (779), 645 states have internal predecessors, (779), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:29:08,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 646 states to 646 states and 779 transitions. [2022-12-14 11:29:08,491 INFO L78 Accepts]: Start accepts. Automaton has 646 states and 779 transitions. Word has length 39 [2022-12-14 11:29:08,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:29:08,491 INFO L495 AbstractCegarLoop]: Abstraction has 646 states and 779 transitions. [2022-12-14 11:29:08,491 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 47 states have (on average 2.3617021276595747) internal successors, (111), 47 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:29:08,492 INFO L276 IsEmpty]: Start isEmpty. Operand 646 states and 779 transitions. [2022-12-14 11:29:08,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-12-14 11:29:08,492 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:29:08,492 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 11:29:08,496 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-12-14 11:29:08,693 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-12-14 11:29:08,694 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-12-14 11:29:08,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:29:08,696 INFO L85 PathProgramCache]: Analyzing trace with hash 415722280, now seen corresponding path program 4 times [2022-12-14 11:29:08,696 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:29:08,697 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1580593411] [2022-12-14 11:29:08,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:29:08,698 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:29:08,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:29:09,332 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:29:09,332 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:29:09,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1580593411] [2022-12-14 11:29:09,333 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1580593411] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 11:29:09,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [518208884] [2022-12-14 11:29:09,333 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 11:29:09,333 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:29:09,333 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 11:29:09,334 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 11:29:09,335 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-12-14 11:29:09,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:29:09,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 82 conjunts are in the unsatisfiable core [2022-12-14 11:29:09,415 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 11:29:09,445 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 11:29:11,661 INFO L321 Elim1Store]: treesize reduction 28, result has 68.5 percent of original size [2022-12-14 11:29:11,662 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 28 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 8 case distinctions, treesize of input 102 treesize of output 105 [2022-12-14 11:29:11,678 WARN L718 sPolynomialRelations]: Constructing 256(two to the power of 8 dual juncts. [2022-12-14 11:29:11,694 WARN L718 sPolynomialRelations]: Constructing 128(two to the power of 7 dual juncts. [2022-12-14 11:29:11,881 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:29:11,881 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 11:29:14,575 INFO L350 Elim1Store]: Elim1 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 119 treesize of output 103 [2022-12-14 11:29:14,584 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 8 select indices, 8 select index equivalence classes, 28 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 183 treesize of output 153 [2022-12-14 11:29:14,588 WARN L718 sPolynomialRelations]: Constructing 256(two to the power of 8 dual juncts. [2022-12-14 11:29:14,599 INFO L350 Elim1Store]: Elim1 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 31 treesize of output 23 [2022-12-14 11:29:14,619 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:29:14,619 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [518208884] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 11:29:14,619 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [587274785] [2022-12-14 11:29:14,620 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 11:29:14,620 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 11:29:14,621 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 11:29:14,621 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 11:29:14,621 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 11:29:14,632 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 11:29:14,632 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-12-14 11:29:14,650 INFO L350 Elim1Store]: Elim1 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 14 treesize of output 10 [2022-12-14 11:29:14,674 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 11:29:14,674 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 24 [2022-12-14 11:29:14,819 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 11:29:16,652 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8625#(and (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (= |#NULL.base| 0))' at error location [2022-12-14 11:29:16,652 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 11:29:16,652 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 11:29:16,653 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 27, 27] total 66 [2022-12-14 11:29:16,653 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [507731861] [2022-12-14 11:29:16,653 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 11:29:16,653 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2022-12-14 11:29:16,653 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:29:16,653 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2022-12-14 11:29:16,654 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=607, Invalid=5093, Unknown=0, NotChecked=0, Total=5700 [2022-12-14 11:29:16,654 INFO L87 Difference]: Start difference. First operand 646 states and 779 transitions. Second operand has 68 states, 67 states have (on average 1.7164179104477613) internal successors, (115), 67 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:29:30,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:29:30,428 INFO L93 Difference]: Finished difference Result 1681 states and 1942 transitions. [2022-12-14 11:29:30,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2022-12-14 11:29:30,429 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 67 states have (on average 1.7164179104477613) internal successors, (115), 67 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2022-12-14 11:29:30,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:29:30,431 INFO L225 Difference]: With dead ends: 1681 [2022-12-14 11:29:30,431 INFO L226 Difference]: Without dead ends: 1681 [2022-12-14 11:29:30,432 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4190 ImplicationChecksByTransitivity, 17.0s TimeCoverageRelationStatistics Valid=2247, Invalid=14783, Unknown=0, NotChecked=0, Total=17030 [2022-12-14 11:29:30,433 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 1643 mSDsluCounter, 171 mSDsCounter, 0 mSdLazyCounter, 2442 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1643 SdHoareTripleChecker+Valid, 180 SdHoareTripleChecker+Invalid, 2458 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 2442 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2022-12-14 11:29:30,433 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1643 Valid, 180 Invalid, 2458 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 2442 Invalid, 0 Unknown, 0 Unchecked, 2.7s Time] [2022-12-14 11:29:30,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1681 states. [2022-12-14 11:29:30,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1681 to 998. [2022-12-14 11:29:30,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 998 states, 996 states have (on average 1.2238955823293172) internal successors, (1219), 997 states have internal predecessors, (1219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:29:30,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 998 states to 998 states and 1219 transitions. [2022-12-14 11:29:30,457 INFO L78 Accepts]: Start accepts. Automaton has 998 states and 1219 transitions. Word has length 39 [2022-12-14 11:29:30,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:29:30,457 INFO L495 AbstractCegarLoop]: Abstraction has 998 states and 1219 transitions. [2022-12-14 11:29:30,457 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 67 states have (on average 1.7164179104477613) internal successors, (115), 67 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:29:30,457 INFO L276 IsEmpty]: Start isEmpty. Operand 998 states and 1219 transitions. [2022-12-14 11:29:30,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-12-14 11:29:30,458 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:29:30,458 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1] [2022-12-14 11:29:30,463 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2022-12-14 11:29:30,659 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2022-12-14 11:29:30,660 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-12-14 11:29:30,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:29:30,661 INFO L85 PathProgramCache]: Analyzing trace with hash 1490388724, now seen corresponding path program 4 times [2022-12-14 11:29:30,661 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:29:30,662 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [132705961] [2022-12-14 11:29:30,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:29:30,662 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:29:30,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:29:31,237 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 11:29:31,237 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:29:31,237 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [132705961] [2022-12-14 11:29:31,238 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [132705961] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 11:29:31,238 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [466022688] [2022-12-14 11:29:31,238 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 11:29:31,238 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:29:31,238 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 11:29:31,239 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 11:29:31,245 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-12-14 11:29:31,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:29:31,315 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 88 conjunts are in the unsatisfiable core [2022-12-14 11:29:31,317 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 11:29:31,320 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-12-14 11:29:31,340 INFO L350 Elim1Store]: Elim1 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 14 treesize of output 10 [2022-12-14 11:29:31,380 INFO L350 Elim1Store]: Elim1 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 16 treesize of output 18 [2022-12-14 11:29:32,224 INFO L321 Elim1Store]: treesize reduction 12, result has 65.7 percent of original size [2022-12-14 11:29:32,225 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 7 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 4 case distinctions, treesize of input 55 treesize of output 43 [2022-12-14 11:29:32,344 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 11:29:32,344 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 11:29:33,355 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 11:29:33,356 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 120 treesize of output 76 [2022-12-14 11:29:33,374 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 11:29:33,374 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 6 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 147 treesize of output 144 [2022-12-14 11:29:33,395 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 11:29:33,395 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 6 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 84 treesize of output 96 [2022-12-14 11:29:33,409 INFO L350 Elim1Store]: Elim1 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 16 treesize of output 12 [2022-12-14 11:29:33,581 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 11:29:33,581 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [466022688] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 11:29:33,581 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2143254119] [2022-12-14 11:29:33,583 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 11:29:33,583 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 11:29:33,583 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 11:29:33,583 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 11:29:33,583 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 11:29:33,605 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 11:29:33,607 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-12-14 11:29:33,620 INFO L350 Elim1Store]: Elim1 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 14 treesize of output 10 [2022-12-14 11:29:33,648 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 11:29:33,649 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 24 [2022-12-14 11:29:34,657 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 11:29:36,555 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11727#(and (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (+ |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 1)) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (= |#NULL.base| 0))' at error location [2022-12-14 11:29:36,555 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 11:29:36,555 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 11:29:36,555 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 18, 18] total 45 [2022-12-14 11:29:36,555 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2041838911] [2022-12-14 11:29:36,555 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 11:29:36,556 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-12-14 11:29:36,556 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:29:36,556 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-12-14 11:29:36,557 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=269, Invalid=2701, Unknown=0, NotChecked=0, Total=2970 [2022-12-14 11:29:36,557 INFO L87 Difference]: Start difference. First operand 998 states and 1219 transitions. Second operand has 47 states, 46 states have (on average 2.6739130434782608) internal successors, (123), 46 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:29:57,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:29:57,866 INFO L93 Difference]: Finished difference Result 2390 states and 2893 transitions. [2022-12-14 11:29:57,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2022-12-14 11:29:57,866 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 46 states have (on average 2.6739130434782608) internal successors, (123), 46 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2022-12-14 11:29:57,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:29:57,870 INFO L225 Difference]: With dead ends: 2390 [2022-12-14 11:29:57,870 INFO L226 Difference]: Without dead ends: 2390 [2022-12-14 11:29:57,872 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 81 SyntacticMatches, 5 SemanticMatches, 154 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7703 ImplicationChecksByTransitivity, 23.3s TimeCoverageRelationStatistics Valid=3502, Invalid=20678, Unknown=0, NotChecked=0, Total=24180 [2022-12-14 11:29:57,872 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 1754 mSDsluCounter, 231 mSDsCounter, 0 mSdLazyCounter, 1202 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1754 SdHoareTripleChecker+Valid, 241 SdHoareTripleChecker+Invalid, 1252 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 1202 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-12-14 11:29:57,872 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1754 Valid, 241 Invalid, 1252 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 1202 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-12-14 11:29:57,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2390 states. [2022-12-14 11:29:57,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2390 to 1295. [2022-12-14 11:29:57,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1295 states, 1293 states have (on average 1.217324052590874) internal successors, (1574), 1294 states have internal predecessors, (1574), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:29:57,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1295 states to 1295 states and 1574 transitions. [2022-12-14 11:29:57,888 INFO L78 Accepts]: Start accepts. Automaton has 1295 states and 1574 transitions. Word has length 44 [2022-12-14 11:29:57,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:29:57,888 INFO L495 AbstractCegarLoop]: Abstraction has 1295 states and 1574 transitions. [2022-12-14 11:29:57,888 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 46 states have (on average 2.6739130434782608) internal successors, (123), 46 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:29:57,888 INFO L276 IsEmpty]: Start isEmpty. Operand 1295 states and 1574 transitions. [2022-12-14 11:29:57,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-12-14 11:29:57,889 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:29:57,889 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 8, 5, 5, 5, 5, 5, 5, 3, 1, 1, 1, 1] [2022-12-14 11:29:57,894 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2022-12-14 11:29:58,090 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-12-14 11:29:58,090 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-12-14 11:29:58,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:29:58,090 INFO L85 PathProgramCache]: Analyzing trace with hash 855428463, now seen corresponding path program 5 times [2022-12-14 11:29:58,090 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:29:58,090 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [460453480] [2022-12-14 11:29:58,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:29:58,091 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:29:58,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:29:58,675 INFO L134 CoverageAnalysis]: Checked inductivity of 167 backedges. 0 proven. 151 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-12-14 11:29:58,675 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:29:58,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [460453480] [2022-12-14 11:29:58,675 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [460453480] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 11:29:58,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1373984970] [2022-12-14 11:29:58,676 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 11:29:58,676 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:29:58,676 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 11:29:58,676 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 11:29:58,677 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82fda3df-4575-4fe0-9232-657522a7660c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-12-14 11:29:58,859 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-12-14 11:29:58,859 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 11:29:58,862 INFO L263 TraceCheckSpWp]: Trace formula consists of 362 conjuncts, 118 conjunts are in the unsatisfiable core [2022-12-14 11:29:58,864 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 11:29:58,869 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-12-14 11:29:58,890 INFO L350 Elim1Store]: Elim1 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 14 treesize of output 10 [2022-12-14 11:29:58,932 INFO L350 Elim1Store]: Elim1 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 16 treesize of output 18 [2022-12-14 11:30:02,163 INFO L321 Elim1Store]: treesize reduction 43, result has 81.7 percent of original size [2022-12-14 11:30:02,164 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 1 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 24 case distinctions, treesize of input 92 treesize of output 225 [2022-12-14 11:30:03,344 INFO L134 CoverageAnalysis]: Checked inductivity of 167 backedges. 9 proven. 151 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-12-14 11:30:03,344 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 11:30:10,354 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 11:30:10,354 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 179 treesize of output 102 [2022-12-14 11:30:10,486 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 11:30:10,486 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 21 case distinctions, treesize of input 236 treesize of output 395 [2022-12-14 11:30:10,680 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 11:30:10,681 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 174 treesize of output 360 [2022-12-14 11:30:10,724 INFO L350 Elim1Store]: Elim1 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 16 treesize of output 12 [2022-12-14 11:32:04,105 INFO L134 CoverageAnalysis]: Checked inductivity of 167 backedges. 0 proven. 160 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-12-14 11:32:04,105 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1373984970] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 11:32:04,105 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1335853841] [2022-12-14 11:32:04,107 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 11:32:04,107 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 11:32:04,107 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 11:32:04,107 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 11:32:04,107 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 11:32:04,126 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 11:32:04,128 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-12-14 11:32:04,146 INFO L350 Elim1Store]: Elim1 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 14 treesize of output 10 [2022-12-14 11:32:04,170 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 11:32:04,171 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 24 [2022-12-14 11:32:05,122 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 11:32:07,322 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16049#(and (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (+ |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 1)) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (= |#NULL.base| 0))' at error location [2022-12-14 11:32:07,322 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 11:32:07,322 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 11:32:07,323 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 28, 27] total 65 [2022-12-14 11:32:07,323 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2119902768] [2022-12-14 11:32:07,323 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 11:32:07,323 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2022-12-14 11:32:07,323 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:32:07,324 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2022-12-14 11:32:07,324 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=538, Invalid=4994, Unknown=18, NotChecked=0, Total=5550 [2022-12-14 11:32:07,325 INFO L87 Difference]: Start difference. First operand 1295 states and 1574 transitions. Second operand has 67 states, 66 states have (on average 2.5) internal successors, (165), 66 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:32:36,559 WARN L233 SmtUtils]: Spent 5.47s on a formula simplification. DAG size of input: 166 DAG size of output: 139 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 11:32:42,803 WARN L233 SmtUtils]: Spent 5.44s on a formula simplification. DAG size of input: 170 DAG size of output: 142 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 11:32:49,359 WARN L233 SmtUtils]: Spent 5.78s on a formula simplification. DAG size of input: 168 DAG size of output: 140 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 11:33:00,334 WARN L233 SmtUtils]: Spent 8.16s on a formula simplification. DAG size of input: 184 DAG size of output: 146 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 11:33:10,634 WARN L233 SmtUtils]: Spent 7.17s on a formula simplification. DAG size of input: 159 DAG size of output: 133 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 11:33:12,576 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.85s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0, 1] [2022-12-14 11:35:27,592 WARN L233 SmtUtils]: Spent 1.95m on a formula simplification. DAG size of input: 179 DAG size of output: 135 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 11:35:33,276 WARN L233 SmtUtils]: Spent 5.11s on a formula simplification. DAG size of input: 166 DAG size of output: 138 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 11:36:36,000 WARN L233 SmtUtils]: Spent 51.82s on a formula simplification. DAG size of input: 188 DAG size of output: 142 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 11:36:41,751 WARN L233 SmtUtils]: Spent 5.19s on a formula simplification. DAG size of input: 170 DAG size of output: 141 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 11:37:37,896 WARN L233 SmtUtils]: Spent 37.55s on a formula simplification. DAG size of input: 182 DAG size of output: 155 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 11:37:47,513 WARN L233 SmtUtils]: Spent 6.81s on a formula simplification. DAG size of input: 168 DAG size of output: 139 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 11:38:40,850 WARN L233 SmtUtils]: Spent 35.71s on a formula simplification. DAG size of input: 177 DAG size of output: 106 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 11:40:47,969 WARN L233 SmtUtils]: Spent 1.93m on a formula simplification. DAG size of input: 178 DAG size of output: 169 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)