./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/cstrspn-alloca-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/cstrspn-alloca-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 45a8f33f173b19ce98ca13bb7c3a70605cebce85501309e729b51c966620adf7 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 16:27:36,752 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 16:27:36,825 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-12-02 16:27:36,830 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 16:27:36,831 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 16:27:36,859 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 16:27:36,860 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 16:27:36,860 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 16:27:36,861 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 16:27:36,861 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 16:27:36,862 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 16:27:36,863 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 16:27:36,863 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 16:27:36,864 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 16:27:36,865 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 16:27:36,865 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 16:27:36,866 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 16:27:36,866 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 16:27:36,867 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 16:27:36,868 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 16:27:36,868 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 16:27:36,869 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 16:27:36,870 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-12-02 16:27:36,870 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-12-02 16:27:36,871 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 16:27:36,872 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 16:27:36,872 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 16:27:36,873 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 16:27:36,873 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 16:27:36,873 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-12-02 16:27:36,874 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-12-02 16:27:36,874 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-12-02 16:27:36,875 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 16:27:36,875 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-12-02 16:27:36,875 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-12-02 16:27:36,875 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 16:27:36,876 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 16:27:36,876 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 16:27:36,876 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 16:27:36,876 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 16:27:36,876 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 16:27:36,877 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 16:27:36,877 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 16:27:36,877 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 16:27:36,878 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 16:27:36,878 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 16:27:36,878 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 16:27:36,878 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 16:27:36,879 INFO L153 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 45a8f33f173b19ce98ca13bb7c3a70605cebce85501309e729b51c966620adf7 [2023-12-02 16:27:37,100 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 16:27:37,121 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 16:27:37,124 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 16:27:37,126 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 16:27:37,126 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 16:27:37,127 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/array-memsafety/cstrspn-alloca-1.i [2023-12-02 16:27:39,941 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 16:27:40,156 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 16:27:40,157 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/sv-benchmarks/c/array-memsafety/cstrspn-alloca-1.i [2023-12-02 16:27:40,171 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/data/94c9caac3/25be73fa5f1141ff920a77b9c80a3be8/FLAGd0a228988 [2023-12-02 16:27:40,183 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/data/94c9caac3/25be73fa5f1141ff920a77b9c80a3be8 [2023-12-02 16:27:40,185 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 16:27:40,187 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 16:27:40,188 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 16:27:40,188 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 16:27:40,194 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 16:27:40,195 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 04:27:40" (1/1) ... [2023-12-02 16:27:40,196 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2c84478c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:27:40, skipping insertion in model container [2023-12-02 16:27:40,196 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 04:27:40" (1/1) ... [2023-12-02 16:27:40,244 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 16:27:40,519 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 16:27:40,532 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 16:27:40,569 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 16:27:40,600 INFO L206 MainTranslator]: Completed translation [2023-12-02 16:27:40,600 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:27:40 WrapperNode [2023-12-02 16:27:40,600 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 16:27:40,602 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 16:27:40,602 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 16:27:40,602 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 16:27:40,610 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:27:40" (1/1) ... [2023-12-02 16:27:40,624 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:27:40" (1/1) ... [2023-12-02 16:27:40,645 INFO L138 Inliner]: procedures = 117, calls = 18, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 107 [2023-12-02 16:27:40,646 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 16:27:40,647 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 16:27:40,647 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 16:27:40,647 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 16:27:40,654 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:27:40" (1/1) ... [2023-12-02 16:27:40,654 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:27:40" (1/1) ... [2023-12-02 16:27:40,658 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:27:40" (1/1) ... [2023-12-02 16:27:40,658 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:27:40" (1/1) ... [2023-12-02 16:27:40,666 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:27:40" (1/1) ... [2023-12-02 16:27:40,669 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:27:40" (1/1) ... [2023-12-02 16:27:40,671 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:27:40" (1/1) ... [2023-12-02 16:27:40,673 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:27:40" (1/1) ... [2023-12-02 16:27:40,676 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 16:27:40,677 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 16:27:40,677 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 16:27:40,677 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 16:27:40,678 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:27:40" (1/1) ... [2023-12-02 16:27:40,684 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 16:27:40,694 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:27:40,706 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 16:27:40,710 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 16:27:40,738 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-12-02 16:27:40,738 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-12-02 16:27:40,738 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-12-02 16:27:40,738 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-12-02 16:27:40,738 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 16:27:40,738 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 16:27:40,844 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 16:27:40,846 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 16:27:41,083 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 16:27:41,155 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 16:27:41,155 INFO L309 CfgBuilder]: Removed 4 assume(true) statements. [2023-12-02 16:27:41,157 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 04:27:41 BoogieIcfgContainer [2023-12-02 16:27:41,157 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 16:27:41,160 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 16:27:41,160 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 16:27:41,164 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 16:27:41,164 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 04:27:40" (1/3) ... [2023-12-02 16:27:41,165 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@74898675 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 04:27:41, skipping insertion in model container [2023-12-02 16:27:41,165 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:27:40" (2/3) ... [2023-12-02 16:27:41,165 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@74898675 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 04:27:41, skipping insertion in model container [2023-12-02 16:27:41,166 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 04:27:41" (3/3) ... [2023-12-02 16:27:41,167 INFO L112 eAbstractionObserver]: Analyzing ICFG cstrspn-alloca-1.i [2023-12-02 16:27:41,189 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 16:27:41,189 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 19 error locations. [2023-12-02 16:27:41,238 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 16:27:41,245 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;@601587a5, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 16:27:41,246 INFO L358 AbstractCegarLoop]: Starting to check reachability of 19 error locations. [2023-12-02 16:27:41,249 INFO L276 IsEmpty]: Start isEmpty. Operand has 39 states, 19 states have (on average 2.4210526315789473) internal successors, (46), 38 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:27:41,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-12-02 16:27:41,255 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:27:41,255 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-12-02 16:27:41,256 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:27:41,260 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:27:41,260 INFO L85 PathProgramCache]: Analyzing trace with hash 164108, now seen corresponding path program 1 times [2023-12-02 16:27:41,268 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:27:41,269 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1930676655] [2023-12-02 16:27:41,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:27:41,270 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:27:41,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:27:41,566 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:27:41,566 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:27:41,567 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1930676655] [2023-12-02 16:27:41,567 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1930676655] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:27:41,567 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:27:41,568 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-12-02 16:27:41,569 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1938252032] [2023-12-02 16:27:41,570 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:27:41,574 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:27:41,575 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:27:41,598 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:27:41,599 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:27:41,601 INFO L87 Difference]: Start difference. First operand has 39 states, 19 states have (on average 2.4210526315789473) internal successors, (46), 38 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) 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) [2023-12-02 16:27:41,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:27:41,660 INFO L93 Difference]: Finished difference Result 37 states and 42 transitions. [2023-12-02 16:27:41,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:27:41,662 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 [2023-12-02 16:27:41,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:27:41,670 INFO L225 Difference]: With dead ends: 37 [2023-12-02 16:27:41,670 INFO L226 Difference]: Without dead ends: 36 [2023-12-02 16:27:41,672 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 [2023-12-02 16:27:41,676 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 37 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 16:27:41,677 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 18 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 16:27:41,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2023-12-02 16:27:41,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2023-12-02 16:27:41,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 35 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) [2023-12-02 16:27:41,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2023-12-02 16:27:41,706 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 3 [2023-12-02 16:27:41,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:27:41,706 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2023-12-02 16:27:41,707 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) [2023-12-02 16:27:41,707 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2023-12-02 16:27:41,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-12-02 16:27:41,707 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:27:41,707 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-12-02 16:27:41,708 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 16:27:41,708 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:27:41,709 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:27:41,709 INFO L85 PathProgramCache]: Analyzing trace with hash 164109, now seen corresponding path program 1 times [2023-12-02 16:27:41,709 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:27:41,709 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [746959952] [2023-12-02 16:27:41,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:27:41,710 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:27:41,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:27:41,993 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:27:41,993 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:27:41,993 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [746959952] [2023-12-02 16:27:41,994 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [746959952] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:27:41,994 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:27:41,994 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 16:27:41,994 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1815291890] [2023-12-02 16:27:41,994 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:27:41,995 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 16:27:41,996 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:27:41,996 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 16:27:41,997 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 16:27:41,997 INFO L87 Difference]: Start difference. First operand 36 states and 41 transitions. Second operand has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:27:42,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:27:42,107 INFO L93 Difference]: Finished difference Result 38 states and 44 transitions. [2023-12-02 16:27:42,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 16:27:42,107 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2023-12-02 16:27:42,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:27:42,108 INFO L225 Difference]: With dead ends: 38 [2023-12-02 16:27:42,109 INFO L226 Difference]: Without dead ends: 38 [2023-12-02 16:27:42,109 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-12-02 16:27:42,111 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 1 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:27:42,111 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 66 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:27:42,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2023-12-02 16:27:42,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2023-12-02 16:27:42,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 21 states have (on average 2.0952380952380953) 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) [2023-12-02 16:27:42,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 44 transitions. [2023-12-02 16:27:42,118 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 44 transitions. Word has length 3 [2023-12-02 16:27:42,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:27:42,118 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 44 transitions. [2023-12-02 16:27:42,118 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:27:42,118 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 44 transitions. [2023-12-02 16:27:42,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-12-02 16:27:42,119 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:27:42,119 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-12-02 16:27:42,119 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-12-02 16:27:42,120 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:27:42,120 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:27:42,120 INFO L85 PathProgramCache]: Analyzing trace with hash 5197514, now seen corresponding path program 1 times [2023-12-02 16:27:42,121 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:27:42,121 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1252754817] [2023-12-02 16:27:42,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:27:42,121 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:27:42,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:27:42,361 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:27:42,362 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:27:42,362 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1252754817] [2023-12-02 16:27:42,362 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1252754817] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:27:42,362 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:27:42,362 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 16:27:42,363 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1001116709] [2023-12-02 16:27:42,363 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:27:42,363 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 16:27:42,363 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:27:42,364 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 16:27:42,364 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-12-02 16:27:42,365 INFO L87 Difference]: Start difference. First operand 38 states and 44 transitions. Second operand has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:27:42,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:27:42,417 INFO L93 Difference]: Finished difference Result 37 states and 43 transitions. [2023-12-02 16:27:42,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:27:42,418 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2023-12-02 16:27:42,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:27:42,419 INFO L225 Difference]: With dead ends: 37 [2023-12-02 16:27:42,419 INFO L226 Difference]: Without dead ends: 37 [2023-12-02 16:27:42,419 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-12-02 16:27:42,421 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 74 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 16:27:42,422 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [74 Valid, 18 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 16:27:42,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2023-12-02 16:27:42,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2023-12-02 16:27:42,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 21 states have (on average 2.0476190476190474) 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) [2023-12-02 16:27:42,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 43 transitions. [2023-12-02 16:27:42,428 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 43 transitions. Word has length 4 [2023-12-02 16:27:42,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:27:42,428 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 43 transitions. [2023-12-02 16:27:42,429 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:27:42,429 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 43 transitions. [2023-12-02 16:27:42,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-12-02 16:27:42,429 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:27:42,430 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-12-02 16:27:42,430 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-12-02 16:27:42,430 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:27:42,431 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:27:42,431 INFO L85 PathProgramCache]: Analyzing trace with hash 5194558, now seen corresponding path program 1 times [2023-12-02 16:27:42,431 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:27:42,431 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [761338117] [2023-12-02 16:27:42,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:27:42,432 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:27:42,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:27:42,492 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:27:42,492 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:27:42,492 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [761338117] [2023-12-02 16:27:42,493 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [761338117] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:27:42,493 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:27:42,493 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-12-02 16:27:42,493 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1388127639] [2023-12-02 16:27:42,493 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:27:42,494 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:27:42,494 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:27:42,495 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:27:42,495 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:27:42,495 INFO L87 Difference]: Start difference. First operand 37 states and 43 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:27:42,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:27:42,536 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2023-12-02 16:27:42,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:27:42,536 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2023-12-02 16:27:42,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:27:42,537 INFO L225 Difference]: With dead ends: 35 [2023-12-02 16:27:42,537 INFO L226 Difference]: Without dead ends: 35 [2023-12-02 16:27:42,538 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 [2023-12-02 16:27:42,539 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 33 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 16:27:42,540 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 17 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 16:27:42,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2023-12-02 16:27:42,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2023-12-02 16:27:42,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 21 states have (on average 1.9523809523809523) internal successors, (41), 34 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) [2023-12-02 16:27:42,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 41 transitions. [2023-12-02 16:27:42,546 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 41 transitions. Word has length 4 [2023-12-02 16:27:42,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:27:42,546 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 41 transitions. [2023-12-02 16:27:42,546 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:27:42,546 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 41 transitions. [2023-12-02 16:27:42,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-12-02 16:27:42,547 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:27:42,547 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-12-02 16:27:42,547 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-12-02 16:27:42,547 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:27:42,548 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:27:42,548 INFO L85 PathProgramCache]: Analyzing trace with hash 5194559, now seen corresponding path program 1 times [2023-12-02 16:27:42,548 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:27:42,548 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1781189789] [2023-12-02 16:27:42,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:27:42,548 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:27:42,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:27:42,718 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:27:42,718 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:27:42,718 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1781189789] [2023-12-02 16:27:42,719 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1781189789] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:27:42,719 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:27:42,719 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 16:27:42,719 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [675350580] [2023-12-02 16:27:42,719 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:27:42,720 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 16:27:42,720 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:27:42,720 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 16:27:42,721 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-12-02 16:27:42,721 INFO L87 Difference]: Start difference. First operand 35 states and 41 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) [2023-12-02 16:27:42,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:27:42,824 INFO L93 Difference]: Finished difference Result 37 states and 44 transitions. [2023-12-02 16:27:42,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 16:27:42,825 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 [2023-12-02 16:27:42,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:27:42,826 INFO L225 Difference]: With dead ends: 37 [2023-12-02 16:27:42,826 INFO L226 Difference]: Without dead ends: 37 [2023-12-02 16:27:42,826 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:27:42,828 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 40 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:27:42,828 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 48 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:27:42,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2023-12-02 16:27:42,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2023-12-02 16:27:42,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 36 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) [2023-12-02 16:27:42,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 44 transitions. [2023-12-02 16:27:42,833 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 44 transitions. Word has length 4 [2023-12-02 16:27:42,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:27:42,833 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 44 transitions. [2023-12-02 16:27:42,834 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) [2023-12-02 16:27:42,834 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 44 transitions. [2023-12-02 16:27:42,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-12-02 16:27:42,834 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:27:42,834 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-12-02 16:27:42,835 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-12-02 16:27:42,835 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:27:42,835 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:27:42,836 INFO L85 PathProgramCache]: Analyzing trace with hash 161122929, now seen corresponding path program 1 times [2023-12-02 16:27:42,836 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:27:42,836 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2025540999] [2023-12-02 16:27:42,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:27:42,836 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:27:42,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:27:43,046 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:27:43,046 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:27:43,046 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2025540999] [2023-12-02 16:27:43,046 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2025540999] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:27:43,047 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:27:43,047 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 16:27:43,047 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1154614291] [2023-12-02 16:27:43,047 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:27:43,047 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 16:27:43,048 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:27:43,048 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 16:27:43,048 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2023-12-02 16:27:43,049 INFO L87 Difference]: Start difference. First operand 37 states and 44 transitions. Second operand has 5 states, 4 states have (on average 1.25) internal successors, (5), 4 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:27:43,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:27:43,106 INFO L93 Difference]: Finished difference Result 36 states and 43 transitions. [2023-12-02 16:27:43,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:27:43,111 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.25) internal successors, (5), 4 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2023-12-02 16:27:43,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:27:43,112 INFO L225 Difference]: With dead ends: 36 [2023-12-02 16:27:43,112 INFO L226 Difference]: Without dead ends: 36 [2023-12-02 16:27:43,113 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2023-12-02 16:27:43,114 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 67 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:27:43,114 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [67 Valid, 16 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:27:43,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2023-12-02 16:27:43,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2023-12-02 16:27:43,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 35 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:27:43,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 43 transitions. [2023-12-02 16:27:43,120 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 43 transitions. Word has length 5 [2023-12-02 16:27:43,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:27:43,120 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 43 transitions. [2023-12-02 16:27:43,120 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.25) internal successors, (5), 4 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:27:43,120 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 43 transitions. [2023-12-02 16:27:43,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-12-02 16:27:43,121 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:27:43,121 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1] [2023-12-02 16:27:43,121 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-12-02 16:27:43,122 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:27:43,122 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:27:43,122 INFO L85 PathProgramCache]: Analyzing trace with hash 157802705, now seen corresponding path program 1 times [2023-12-02 16:27:43,122 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:27:43,123 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [687305848] [2023-12-02 16:27:43,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:27:43,123 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:27:43,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:27:43,375 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:27:43,375 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:27:43,376 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [687305848] [2023-12-02 16:27:43,376 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [687305848] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:27:43,376 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [458208046] [2023-12-02 16:27:43,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:27:43,376 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:27:43,376 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:27:43,380 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:27:43,381 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 16:27:43,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:27:43,460 INFO L262 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 16 conjunts are in the unsatisfiable core [2023-12-02 16:27:43,466 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:27:43,604 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-12-02 16:27:43,610 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 16:27:43,614 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 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 5 treesize of output 3 [2023-12-02 16:27:43,773 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:27:43,773 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:27:43,890 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:27:43,891 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [458208046] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:27:43,891 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [473657637] [2023-12-02 16:27:43,908 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2023-12-02 16:27:43,908 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:27:43,911 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:27:43,916 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:27:43,916 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:27:44,708 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:27:44,988 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '544#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_#t~nondet15#1| 127) (<= (select |#length| |ULTIMATE.start_main_~nondetString1~0#1.base|) |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 (+ 128 |ULTIMATE.start_main_#t~nondet15#1|)) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 2 |ULTIMATE.start_main_~length1~0#1|))' at error location [2023-12-02 16:27:44,988 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:27:44,988 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:27:44,989 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 9 [2023-12-02 16:27:44,989 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1231617413] [2023-12-02 16:27:44,989 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:27:44,989 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-12-02 16:27:44,989 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:27:44,990 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-12-02 16:27:44,990 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2023-12-02 16:27:44,991 INFO L87 Difference]: Start difference. First operand 36 states and 43 transitions. Second operand has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:27:45,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:27:45,193 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2023-12-02 16:27:45,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 16:27:45,195 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2023-12-02 16:27:45,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:27:45,195 INFO L225 Difference]: With dead ends: 36 [2023-12-02 16:27:45,195 INFO L226 Difference]: Without dead ends: 36 [2023-12-02 16:27:45,196 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=68, Invalid=204, Unknown=0, NotChecked=0, Total=272 [2023-12-02 16:27:45,197 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 2 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:27:45,197 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 73 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 84 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:27:45,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2023-12-02 16:27:45,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 33. [2023-12-02 16:27:45,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 32 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) [2023-12-02 16:27:45,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 39 transitions. [2023-12-02 16:27:45,201 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 39 transitions. Word has length 5 [2023-12-02 16:27:45,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:27:45,201 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 39 transitions. [2023-12-02 16:27:45,202 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:27:45,202 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 39 transitions. [2023-12-02 16:27:45,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-12-02 16:27:45,202 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:27:45,202 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-12-02 16:27:45,212 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 16:27:45,407 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:27:45,407 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:27:45,407 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:27:45,408 INFO L85 PathProgramCache]: Analyzing trace with hash 699845644, now seen corresponding path program 1 times [2023-12-02 16:27:45,408 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:27:45,408 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1314008684] [2023-12-02 16:27:45,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:27:45,408 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:27:45,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:27:45,500 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:27:45,500 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:27:45,501 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1314008684] [2023-12-02 16:27:45,501 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1314008684] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:27:45,501 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:27:45,501 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 16:27:45,501 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [494160099] [2023-12-02 16:27:45,501 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:27:45,502 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 16:27:45,502 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:27:45,502 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 16:27:45,502 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-12-02 16:27:45,503 INFO L87 Difference]: Start difference. First operand 33 states and 39 transitions. Second operand has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:27:45,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:27:45,587 INFO L93 Difference]: Finished difference Result 52 states and 62 transitions. [2023-12-02 16:27:45,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 16:27:45,588 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-12-02 16:27:45,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:27:45,588 INFO L225 Difference]: With dead ends: 52 [2023-12-02 16:27:45,588 INFO L226 Difference]: Without dead ends: 52 [2023-12-02 16:27:45,589 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 [2023-12-02 16:27:45,589 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 78 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 78 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:27:45,590 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [78 Valid, 25 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:27:45,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2023-12-02 16:27:45,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 36. [2023-12-02 16:27:45,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 24 states have (on average 1.875) internal successors, (45), 35 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) [2023-12-02 16:27:45,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 45 transitions. [2023-12-02 16:27:45,595 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 45 transitions. Word has length 6 [2023-12-02 16:27:45,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:27:45,595 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 45 transitions. [2023-12-02 16:27:45,595 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:27:45,595 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 45 transitions. [2023-12-02 16:27:45,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-12-02 16:27:45,596 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:27:45,596 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-12-02 16:27:45,596 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-12-02 16:27:45,596 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:27:45,597 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:27:45,597 INFO L85 PathProgramCache]: Analyzing trace with hash 699845643, now seen corresponding path program 1 times [2023-12-02 16:27:45,597 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:27:45,597 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1955766394] [2023-12-02 16:27:45,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:27:45,598 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:27:45,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:27:45,640 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:27:45,640 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:27:45,640 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1955766394] [2023-12-02 16:27:45,640 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1955766394] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:27:45,640 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:27:45,640 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 16:27:45,641 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1146704537] [2023-12-02 16:27:45,641 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:27:45,641 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 16:27:45,641 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:27:45,642 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 16:27:45,642 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 16:27:45,642 INFO L87 Difference]: Start difference. First operand 36 states and 45 transitions. Second operand has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:27:45,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:27:45,691 INFO L93 Difference]: Finished difference Result 34 states and 41 transitions. [2023-12-02 16:27:45,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 16:27:45,692 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-12-02 16:27:45,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:27:45,692 INFO L225 Difference]: With dead ends: 34 [2023-12-02 16:27:45,692 INFO L226 Difference]: Without dead ends: 34 [2023-12-02 16:27:45,693 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 [2023-12-02 16:27:45,694 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 51 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 16:27:45,694 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [51 Valid, 18 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 16:27:45,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2023-12-02 16:27:45,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2023-12-02 16:27:45,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 24 states have (on average 1.7083333333333333) internal successors, (41), 33 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) [2023-12-02 16:27:45,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 41 transitions. [2023-12-02 16:27:45,698 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 41 transitions. Word has length 6 [2023-12-02 16:27:45,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:27:45,698 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 41 transitions. [2023-12-02 16:27:45,698 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:27:45,698 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 41 transitions. [2023-12-02 16:27:45,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-12-02 16:27:45,699 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:27:45,699 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2023-12-02 16:27:45,699 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-12-02 16:27:45,699 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:27:45,700 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:27:45,700 INFO L85 PathProgramCache]: Analyzing trace with hash 697085942, now seen corresponding path program 1 times [2023-12-02 16:27:45,700 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:27:45,700 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [480816092] [2023-12-02 16:27:45,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:27:45,701 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:27:45,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:27:45,927 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:27:45,927 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:27:45,927 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [480816092] [2023-12-02 16:27:45,928 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [480816092] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:27:45,928 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1002880267] [2023-12-02 16:27:45,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:27:45,928 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:27:45,928 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:27:45,929 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:27:45,931 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 16:27:45,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:27:45,995 INFO L262 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 16 conjunts are in the unsatisfiable core [2023-12-02 16:27:45,997 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:27:46,016 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 7 [2023-12-02 16:27:46,023 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-12-02 16:27:46,224 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:27:46,224 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:27:46,416 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:27:46,416 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1002880267] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:27:46,416 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [819967733] [2023-12-02 16:27:46,419 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2023-12-02 16:27:46,419 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:27:46,419 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:27:46,419 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:27:46,420 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:27:46,840 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:27:47,322 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '835#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 0 (+ 128 |ULTIMATE.start_main_#t~nondet17#1|)) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~length1~0#1| 1) (<= |ULTIMATE.start_main_#t~nondet17#1| 127) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= (+ 2 |ULTIMATE.start_main_~i~1#1|) |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= (select |#length| |ULTIMATE.start_main_~nondetString2~0#1.base|) |ULTIMATE.start_main_~i~1#1|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|))' at error location [2023-12-02 16:27:47,322 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:27:47,322 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:27:47,323 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 12 [2023-12-02 16:27:47,323 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1847315852] [2023-12-02 16:27:47,323 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:27:47,323 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-12-02 16:27:47,323 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:27:47,324 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-12-02 16:27:47,324 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2023-12-02 16:27:47,324 INFO L87 Difference]: Start difference. First operand 34 states and 41 transitions. Second operand has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 13 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:27:47,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:27:47,562 INFO L93 Difference]: Finished difference Result 34 states and 42 transitions. [2023-12-02 16:27:47,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 16:27:47,563 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 13 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-12-02 16:27:47,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:27:47,564 INFO L225 Difference]: With dead ends: 34 [2023-12-02 16:27:47,564 INFO L226 Difference]: Without dead ends: 34 [2023-12-02 16:27:47,564 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=101, Invalid=319, Unknown=0, NotChecked=0, Total=420 [2023-12-02 16:27:47,565 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 61 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 96 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:27:47,565 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [61 Valid, 56 Invalid, 96 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:27:47,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2023-12-02 16:27:47,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 31. [2023-12-02 16:27:47,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 30 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) [2023-12-02 16:27:47,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 37 transitions. [2023-12-02 16:27:47,568 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 37 transitions. Word has length 6 [2023-12-02 16:27:47,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:27:47,568 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 37 transitions. [2023-12-02 16:27:47,569 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 13 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:27:47,569 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 37 transitions. [2023-12-02 16:27:47,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-12-02 16:27:47,569 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:27:47,569 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:27:47,574 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 16:27:47,774 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-12-02 16:27:47,774 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:27:47,775 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:27:47,775 INFO L85 PathProgramCache]: Analyzing trace with hash 1330336364, now seen corresponding path program 1 times [2023-12-02 16:27:47,775 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:27:47,775 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1360325670] [2023-12-02 16:27:47,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:27:47,775 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:27:47,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:27:47,929 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:27:47,929 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:27:47,929 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1360325670] [2023-12-02 16:27:47,929 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1360325670] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:27:47,929 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:27:47,930 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 16:27:47,930 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [74772163] [2023-12-02 16:27:47,930 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:27:47,930 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 16:27:47,930 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:27:47,931 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 16:27:47,931 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 16:27:47,931 INFO L87 Difference]: Start difference. First operand 31 states and 37 transitions. Second operand has 5 states, 4 states have (on average 2.25) internal successors, (9), 4 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) [2023-12-02 16:27:48,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:27:48,044 INFO L93 Difference]: Finished difference Result 45 states and 55 transitions. [2023-12-02 16:27:48,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 16:27:48,045 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.25) internal successors, (9), 4 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 [2023-12-02 16:27:48,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:27:48,046 INFO L225 Difference]: With dead ends: 45 [2023-12-02 16:27:48,046 INFO L226 Difference]: Without dead ends: 45 [2023-12-02 16:27:48,046 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 [2023-12-02 16:27:48,047 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 92 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:27:48,048 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [92 Valid, 26 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:27:48,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2023-12-02 16:27:48,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 36. [2023-12-02 16:27:48,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 27 states have (on average 1.7407407407407407) internal successors, (47), 35 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:27:48,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 47 transitions. [2023-12-02 16:27:48,051 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 47 transitions. Word has length 9 [2023-12-02 16:27:48,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:27:48,052 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 47 transitions. [2023-12-02 16:27:48,052 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.25) internal successors, (9), 4 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) [2023-12-02 16:27:48,052 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 47 transitions. [2023-12-02 16:27:48,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-12-02 16:27:48,052 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:27:48,052 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:27:48,053 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-12-02 16:27:48,053 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr12REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:27:48,053 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:27:48,053 INFO L85 PathProgramCache]: Analyzing trace with hash 1330336363, now seen corresponding path program 1 times [2023-12-02 16:27:48,054 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:27:48,054 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1224075144] [2023-12-02 16:27:48,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:27:48,054 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:27:48,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:27:48,111 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:27:48,111 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:27:48,112 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1224075144] [2023-12-02 16:27:48,112 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1224075144] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:27:48,112 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:27:48,112 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 16:27:48,112 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [965342306] [2023-12-02 16:27:48,112 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:27:48,113 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 16:27:48,113 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:27:48,113 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 16:27:48,113 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 16:27:48,113 INFO L87 Difference]: Start difference. First operand 36 states and 47 transitions. Second operand has 4 states, 3 states have (on average 3.0) internal successors, (9), 4 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) [2023-12-02 16:27:48,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:27:48,168 INFO L93 Difference]: Finished difference Result 35 states and 43 transitions. [2023-12-02 16:27:48,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 16:27:48,168 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.0) internal successors, (9), 4 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 [2023-12-02 16:27:48,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:27:48,169 INFO L225 Difference]: With dead ends: 35 [2023-12-02 16:27:48,169 INFO L226 Difference]: Without dead ends: 35 [2023-12-02 16:27:48,169 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 [2023-12-02 16:27:48,170 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 34 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 16:27:48,170 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 20 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 16:27:48,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2023-12-02 16:27:48,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 33. [2023-12-02 16:27:48,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 27 states have (on average 1.5185185185185186) internal successors, (41), 32 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) [2023-12-02 16:27:48,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 41 transitions. [2023-12-02 16:27:48,173 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 41 transitions. Word has length 9 [2023-12-02 16:27:48,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:27:48,174 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 41 transitions. [2023-12-02 16:27:48,174 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.0) internal successors, (9), 4 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) [2023-12-02 16:27:48,174 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 41 transitions. [2023-12-02 16:27:48,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-12-02 16:27:48,174 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:27:48,174 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:27:48,175 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-12-02 16:27:48,175 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr18ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:27:48,175 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:27:48,175 INFO L85 PathProgramCache]: Analyzing trace with hash -1709317510, now seen corresponding path program 1 times [2023-12-02 16:27:48,175 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:27:48,176 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [566620095] [2023-12-02 16:27:48,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:27:48,176 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:27:48,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:27:48,305 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:27:48,305 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:27:48,305 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [566620095] [2023-12-02 16:27:48,305 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [566620095] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:27:48,306 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:27:48,306 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 16:27:48,306 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [87331947] [2023-12-02 16:27:48,306 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:27:48,306 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 16:27:48,306 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:27:48,307 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 16:27:48,307 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 16:27:48,307 INFO L87 Difference]: Start difference. First operand 33 states and 41 transitions. Second operand has 4 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) [2023-12-02 16:27:48,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:27:48,342 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2023-12-02 16:27:48,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 16:27:48,343 INFO L78 Accepts]: Start accepts. Automaton has has 4 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 [2023-12-02 16:27:48,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:27:48,344 INFO L225 Difference]: With dead ends: 32 [2023-12-02 16:27:48,344 INFO L226 Difference]: Without dead ends: 29 [2023-12-02 16:27:48,344 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 16:27:48,345 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 20 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 16:27:48,345 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 30 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 16:27:48,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2023-12-02 16:27:48,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2023-12-02 16:27:48,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 24 states have (on average 1.4583333333333333) internal successors, (35), 28 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:27:48,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2023-12-02 16:27:48,347 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 10 [2023-12-02 16:27:48,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:27:48,348 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2023-12-02 16:27:48,348 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 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) [2023-12-02 16:27:48,348 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2023-12-02 16:27:48,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-12-02 16:27:48,348 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:27:48,349 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:27:48,349 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2023-12-02 16:27:48,349 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:27:48,349 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:27:48,349 INFO L85 PathProgramCache]: Analyzing trace with hash -1906038259, now seen corresponding path program 1 times [2023-12-02 16:27:48,350 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:27:48,350 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1057770139] [2023-12-02 16:27:48,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:27:48,350 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:27:48,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:27:48,378 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:27:48,379 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:27:48,379 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1057770139] [2023-12-02 16:27:48,379 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1057770139] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:27:48,379 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:27:48,379 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 16:27:48,379 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [983672567] [2023-12-02 16:27:48,379 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:27:48,380 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:27:48,380 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:27:48,380 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:27:48,380 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:27:48,381 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 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) [2023-12-02 16:27:48,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:27:48,405 INFO L93 Difference]: Finished difference Result 31 states and 37 transitions. [2023-12-02 16:27:48,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:27:48,406 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 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 [2023-12-02 16:27:48,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:27:48,407 INFO L225 Difference]: With dead ends: 31 [2023-12-02 16:27:48,407 INFO L226 Difference]: Without dead ends: 31 [2023-12-02 16:27:48,407 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 [2023-12-02 16:27:48,408 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 16:27:48,408 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 25 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 16:27:48,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2023-12-02 16:27:48,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2023-12-02 16:27:48,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.4230769230769231) internal successors, (37), 30 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) [2023-12-02 16:27:48,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 37 transitions. [2023-12-02 16:27:48,411 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 37 transitions. Word has length 12 [2023-12-02 16:27:48,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:27:48,411 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 37 transitions. [2023-12-02 16:27:48,411 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 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) [2023-12-02 16:27:48,411 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 37 transitions. [2023-12-02 16:27:48,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-12-02 16:27:48,412 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:27:48,412 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:27:48,412 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2023-12-02 16:27:48,413 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:27:48,413 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:27:48,413 INFO L85 PathProgramCache]: Analyzing trace with hash 1042210619, now seen corresponding path program 1 times [2023-12-02 16:27:48,413 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:27:48,414 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1794569913] [2023-12-02 16:27:48,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:27:48,414 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:27:48,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:27:48,723 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:27:48,723 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:27:48,723 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1794569913] [2023-12-02 16:27:48,724 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1794569913] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:27:48,724 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:27:48,724 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-12-02 16:27:48,724 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1621734678] [2023-12-02 16:27:48,724 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:27:48,725 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 16:27:48,725 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:27:48,725 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 16:27:48,726 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:27:48,726 INFO L87 Difference]: Start difference. First operand 31 states and 37 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 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) [2023-12-02 16:27:48,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:27:48,864 INFO L93 Difference]: Finished difference Result 39 states and 46 transitions. [2023-12-02 16:27:48,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 16:27:48,865 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 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 [2023-12-02 16:27:48,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:27:48,865 INFO L225 Difference]: With dead ends: 39 [2023-12-02 16:27:48,865 INFO L226 Difference]: Without dead ends: 33 [2023-12-02 16:27:48,865 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2023-12-02 16:27:48,866 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 8 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 81 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:27:48,867 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 69 Invalid, 81 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 80 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:27:48,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2023-12-02 16:27:48,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2023-12-02 16:27:48,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.4074074074074074) internal successors, (38), 31 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) [2023-12-02 16:27:48,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 38 transitions. [2023-12-02 16:27:48,870 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 38 transitions. Word has length 13 [2023-12-02 16:27:48,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:27:48,870 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 38 transitions. [2023-12-02 16:27:48,871 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 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) [2023-12-02 16:27:48,871 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 38 transitions. [2023-12-02 16:27:48,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-12-02 16:27:48,872 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:27:48,872 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:27:48,872 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2023-12-02 16:27:48,872 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:27:48,873 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:27:48,873 INFO L85 PathProgramCache]: Analyzing trace with hash 1790073343, now seen corresponding path program 1 times [2023-12-02 16:27:48,873 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:27:48,874 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [992724147] [2023-12-02 16:27:48,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:27:48,874 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:27:48,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:27:49,197 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:27:49,198 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:27:49,198 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [992724147] [2023-12-02 16:27:49,198 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [992724147] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:27:49,198 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:27:49,198 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2023-12-02 16:27:49,198 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1029775019] [2023-12-02 16:27:49,198 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:27:49,199 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 16:27:49,199 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:27:49,199 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 16:27:49,199 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2023-12-02 16:27:49,199 INFO L87 Difference]: Start difference. First operand 32 states and 38 transitions. Second operand has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:27:49,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:27:49,354 INFO L93 Difference]: Finished difference Result 49 states and 56 transitions. [2023-12-02 16:27:49,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-12-02 16:27:49,354 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2023-12-02 16:27:49,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:27:49,355 INFO L225 Difference]: With dead ends: 49 [2023-12-02 16:27:49,355 INFO L226 Difference]: Without dead ends: 49 [2023-12-02 16:27:49,355 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=87, Unknown=0, NotChecked=0, Total=132 [2023-12-02 16:27:49,356 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 64 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 87 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:27:49,356 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [64 Valid, 43 Invalid, 87 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:27:49,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2023-12-02 16:27:49,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2023-12-02 16:27:49,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.3414634146341464) internal successors, (55), 45 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:27:49,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 55 transitions. [2023-12-02 16:27:49,359 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 55 transitions. Word has length 15 [2023-12-02 16:27:49,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:27:49,359 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 55 transitions. [2023-12-02 16:27:49,360 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:27:49,360 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 55 transitions. [2023-12-02 16:27:49,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-12-02 16:27:49,361 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:27:49,361 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:27:49,361 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2023-12-02 16:27:49,361 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:27:49,361 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:27:49,362 INFO L85 PathProgramCache]: Analyzing trace with hash -337827262, now seen corresponding path program 1 times [2023-12-02 16:27:49,362 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:27:49,362 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1829472619] [2023-12-02 16:27:49,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:27:49,362 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:27:49,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:27:49,479 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:27:49,479 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:27:49,479 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1829472619] [2023-12-02 16:27:49,479 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1829472619] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:27:49,479 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:27:49,479 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-12-02 16:27:49,479 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1681551337] [2023-12-02 16:27:49,480 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:27:49,480 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 16:27:49,480 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:27:49,481 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 16:27:49,481 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2023-12-02 16:27:49,481 INFO L87 Difference]: Start difference. First operand 46 states and 55 transitions. Second operand has 8 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:27:49,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:27:49,608 INFO L93 Difference]: Finished difference Result 47 states and 52 transitions. [2023-12-02 16:27:49,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-12-02 16:27:49,608 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2023-12-02 16:27:49,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:27:49,609 INFO L225 Difference]: With dead ends: 47 [2023-12-02 16:27:49,609 INFO L226 Difference]: Without dead ends: 34 [2023-12-02 16:27:49,609 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 [2023-12-02 16:27:49,610 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 39 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 101 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:27:49,610 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 32 Invalid, 101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 101 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:27:49,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2023-12-02 16:27:49,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2023-12-02 16:27:49,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.3571428571428572) internal successors, (38), 32 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) [2023-12-02 16:27:49,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 38 transitions. [2023-12-02 16:27:49,612 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 38 transitions. Word has length 16 [2023-12-02 16:27:49,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:27:49,613 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 38 transitions. [2023-12-02 16:27:49,613 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:27:49,613 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 38 transitions. [2023-12-02 16:27:49,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-12-02 16:27:49,613 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:27:49,614 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:27:49,614 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2023-12-02 16:27:49,614 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:27:49,614 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:27:49,615 INFO L85 PathProgramCache]: Analyzing trace with hash 458926632, now seen corresponding path program 1 times [2023-12-02 16:27:49,615 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:27:49,615 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [179711752] [2023-12-02 16:27:49,615 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:27:49,615 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:27:49,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:27:49,913 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:27:49,913 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:27:49,914 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [179711752] [2023-12-02 16:27:49,914 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [179711752] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:27:49,914 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [187282113] [2023-12-02 16:27:49,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:27:49,914 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:27:49,914 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:27:49,915 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:27:49,918 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 16:27:50,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:27:50,014 INFO L262 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 20 conjunts are in the unsatisfiable core [2023-12-02 16:27:50,016 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:27:50,114 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:27:50,115 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:27:50,235 INFO L378 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 5 treesize of output 3 [2023-12-02 16:27:50,263 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:27:50,263 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [187282113] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:27:50,264 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [874545167] [2023-12-02 16:27:50,266 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-12-02 16:27:50,267 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:27:50,267 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:27:50,267 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:27:50,267 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:27:51,468 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:27:53,199 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1611#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0))' at error location [2023-12-02 16:27:53,199 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:27:53,199 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:27:53,199 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 17 [2023-12-02 16:27:53,200 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2091974132] [2023-12-02 16:27:53,200 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:27:53,200 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-12-02 16:27:53,200 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:27:53,201 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-12-02 16:27:53,201 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=858, Unknown=1, NotChecked=0, Total=992 [2023-12-02 16:27:53,202 INFO L87 Difference]: Start difference. First operand 33 states and 38 transitions. Second operand has 18 states, 17 states have (on average 2.4705882352941178) internal successors, (42), 18 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) [2023-12-02 16:27:53,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:27:53,388 INFO L93 Difference]: Finished difference Result 47 states and 52 transitions. [2023-12-02 16:27:53,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-12-02 16:27:53,388 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.4705882352941178) internal successors, (42), 18 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) Word has length 17 [2023-12-02 16:27:53,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:27:53,389 INFO L225 Difference]: With dead ends: 47 [2023-12-02 16:27:53,389 INFO L226 Difference]: Without dead ends: 43 [2023-12-02 16:27:53,390 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 413 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=187, Invalid=1144, Unknown=1, NotChecked=0, Total=1332 [2023-12-02 16:27:53,390 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 103 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 149 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 156 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 149 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:27:53,391 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [103 Valid, 31 Invalid, 156 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 149 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:27:53,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2023-12-02 16:27:53,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 29. [2023-12-02 16:27:53,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 28 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) [2023-12-02 16:27:53,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2023-12-02 16:27:53,393 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 17 [2023-12-02 16:27:53,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:27:53,394 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2023-12-02 16:27:53,394 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 2.4705882352941178) internal successors, (42), 18 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) [2023-12-02 16:27:53,394 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2023-12-02 16:27:53,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-12-02 16:27:53,394 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:27:53,395 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:27:53,400 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 16:27:53,600 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-12-02 16:27:53,600 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:27:53,600 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:27:53,600 INFO L85 PathProgramCache]: Analyzing trace with hash -1353174559, now seen corresponding path program 1 times [2023-12-02 16:27:53,601 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:27:53,601 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1095560892] [2023-12-02 16:27:53,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:27:53,601 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:27:53,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:27:53,806 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:27:53,806 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:27:53,806 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1095560892] [2023-12-02 16:27:53,806 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1095560892] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:27:53,806 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [920346463] [2023-12-02 16:27:53,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:27:53,807 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:27:53,807 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:27:53,808 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:27:53,812 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 16:27:53,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:27:53,896 INFO L262 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 20 conjunts are in the unsatisfiable core [2023-12-02 16:27:53,898 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:27:53,990 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:27:53,990 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:27:54,077 INFO L378 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 5 treesize of output 3 [2023-12-02 16:27:54,097 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:27:54,098 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [920346463] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:27:54,098 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [970194934] [2023-12-02 16:27:54,100 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-12-02 16:27:54,101 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:27:54,101 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:27:54,101 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:27:54,101 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:27:55,322 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:27:56,804 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1836#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= (select |#length| |ULTIMATE.start_cstrspn_~sc1~0#1.base|) |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |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_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0))' at error location [2023-12-02 16:27:56,804 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:27:56,804 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:27:56,804 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 15 [2023-12-02 16:27:56,805 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1290292562] [2023-12-02 16:27:56,805 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:27:56,805 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-12-02 16:27:56,805 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:27:56,806 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-12-02 16:27:56,806 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=862, Unknown=0, NotChecked=0, Total=992 [2023-12-02 16:27:56,806 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand has 17 states, 16 states have (on average 3.0625) internal successors, (49), 16 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:27:56,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:27:56,946 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2023-12-02 16:27:56,946 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-12-02 16:27:56,946 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 3.0625) internal successors, (49), 16 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2023-12-02 16:27:56,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:27:56,947 INFO L225 Difference]: With dead ends: 56 [2023-12-02 16:27:56,947 INFO L226 Difference]: Without dead ends: 56 [2023-12-02 16:27:56,948 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 29 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 407 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=179, Invalid=1153, Unknown=0, NotChecked=0, Total=1332 [2023-12-02 16:27:56,948 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 136 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 99 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 136 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 99 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:27:56,948 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [136 Valid, 30 Invalid, 104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 99 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:27:56,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2023-12-02 16:27:56,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 40. [2023-12-02 16:27:56,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 38 states have (on average 1.236842105263158) internal successors, (47), 39 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:27:56,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 47 transitions. [2023-12-02 16:27:56,951 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 47 transitions. Word has length 19 [2023-12-02 16:27:56,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:27:56,951 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 47 transitions. [2023-12-02 16:27:56,951 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 3.0625) internal successors, (49), 16 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:27:56,952 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 47 transitions. [2023-12-02 16:27:56,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-12-02 16:27:56,952 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:27:56,952 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:27:56,956 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 16:27:57,153 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:27:57,153 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:27:57,153 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:27:57,153 INFO L85 PathProgramCache]: Analyzing trace with hash 1057224951, now seen corresponding path program 2 times [2023-12-02 16:27:57,154 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:27:57,154 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1447531739] [2023-12-02 16:27:57,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:27:57,154 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:27:57,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:27:57,462 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:27:57,462 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:27:57,462 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1447531739] [2023-12-02 16:27:57,462 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1447531739] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:27:57,463 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [869738701] [2023-12-02 16:27:57,463 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 16:27:57,463 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:27:57,463 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:27:57,464 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:27:57,466 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 16:27:57,618 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-12-02 16:27:57,618 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:27:57,620 INFO L262 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 33 conjunts are in the unsatisfiable core [2023-12-02 16:27:57,621 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:27:57,667 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-12-02 16:27:57,710 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:27:57,710 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:27:57,726 INFO L378 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 15 treesize of output 13 [2023-12-02 16:27:57,727 INFO L378 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 [2023-12-02 16:27:57,765 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:27:57,766 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [869738701] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:27:57,766 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2064277664] [2023-12-02 16:27:57,768 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-12-02 16:27:57,768 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:27:57,768 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:27:57,768 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:27:57,769 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:27:58,687 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:28:00,041 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2097#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0))' at error location [2023-12-02 16:28:00,041 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:28:00,041 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:28:00,041 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 20 [2023-12-02 16:28:00,041 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1115253255] [2023-12-02 16:28:00,041 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:28:00,042 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-12-02 16:28:00,042 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:28:00,042 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-12-02 16:28:00,043 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=990, Unknown=0, NotChecked=0, Total=1122 [2023-12-02 16:28:00,043 INFO L87 Difference]: Start difference. First operand 40 states and 47 transitions. Second operand has 20 states, 20 states have (on average 2.1) internal successors, (42), 20 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) [2023-12-02 16:28:00,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:28:00,251 INFO L93 Difference]: Finished difference Result 69 states and 77 transitions. [2023-12-02 16:28:00,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-12-02 16:28:00,251 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.1) internal successors, (42), 20 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) Word has length 21 [2023-12-02 16:28:00,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:28:00,252 INFO L225 Difference]: With dead ends: 69 [2023-12-02 16:28:00,252 INFO L226 Difference]: Without dead ends: 65 [2023-12-02 16:28:00,252 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 407 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=214, Invalid=1426, Unknown=0, NotChecked=0, Total=1640 [2023-12-02 16:28:00,253 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 106 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 195 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 106 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 197 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 195 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:28:00,253 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [106 Valid, 78 Invalid, 197 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 195 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:28:00,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2023-12-02 16:28:00,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 63. [2023-12-02 16:28:00,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 61 states have (on average 1.180327868852459) internal successors, (72), 62 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:28:00,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 72 transitions. [2023-12-02 16:28:00,256 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 72 transitions. Word has length 21 [2023-12-02 16:28:00,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:28:00,256 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 72 transitions. [2023-12-02 16:28:00,256 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.1) internal successors, (42), 20 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) [2023-12-02 16:28:00,256 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 72 transitions. [2023-12-02 16:28:00,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-12-02 16:28:00,257 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:28:00,257 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:28:00,262 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-12-02 16:28:00,457 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:28:00,458 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:28:00,458 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:28:00,458 INFO L85 PathProgramCache]: Analyzing trace with hash 1024444000, now seen corresponding path program 3 times [2023-12-02 16:28:00,458 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:28:00,458 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [456635391] [2023-12-02 16:28:00,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:28:00,459 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:28:00,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:28:00,794 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:28:00,794 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:28:00,794 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [456635391] [2023-12-02 16:28:00,794 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [456635391] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:28:00,794 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1746444586] [2023-12-02 16:28:00,794 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 16:28:00,794 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:28:00,794 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:28:00,795 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:28:00,796 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 16:28:00,880 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 16:28:00,881 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:28:00,882 INFO L262 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 26 conjunts are in the unsatisfiable core [2023-12-02 16:28:00,884 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:28:00,889 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-12-02 16:28:00,993 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:28:00,994 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:28:01,165 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:28:01,165 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1746444586] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:28:01,165 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [614808600] [2023-12-02 16:28:01,167 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-12-02 16:28:01,168 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:28:01,168 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:28:01,168 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:28:01,168 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:28:01,787 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:28:03,253 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2413#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0))' at error location [2023-12-02 16:28:03,253 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:28:03,253 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:28:03,253 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 9] total 23 [2023-12-02 16:28:03,254 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [103006151] [2023-12-02 16:28:03,254 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:28:03,254 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2023-12-02 16:28:03,254 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:28:03,255 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2023-12-02 16:28:03,255 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=1262, Unknown=1, NotChecked=0, Total=1406 [2023-12-02 16:28:03,255 INFO L87 Difference]: Start difference. First operand 63 states and 72 transitions. Second operand has 24 states, 23 states have (on average 2.652173913043478) internal successors, (61), 24 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:28:03,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:28:03,665 INFO L93 Difference]: Finished difference Result 102 states and 114 transitions. [2023-12-02 16:28:03,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-12-02 16:28:03,665 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 2.652173913043478) internal successors, (61), 24 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2023-12-02 16:28:03,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:28:03,667 INFO L225 Difference]: With dead ends: 102 [2023-12-02 16:28:03,667 INFO L226 Difference]: Without dead ends: 102 [2023-12-02 16:28:03,668 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 594 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=227, Invalid=1752, Unknown=1, NotChecked=0, Total=1980 [2023-12-02 16:28:03,669 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 118 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 428 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 118 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 430 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 428 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:28:03,669 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [118 Valid, 75 Invalid, 430 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 428 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 16:28:03,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2023-12-02 16:28:03,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 71. [2023-12-02 16:28:03,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 69 states have (on average 1.1884057971014492) internal successors, (82), 70 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:28:03,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 82 transitions. [2023-12-02 16:28:03,674 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 82 transitions. Word has length 23 [2023-12-02 16:28:03,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:28:03,674 INFO L495 AbstractCegarLoop]: Abstraction has 71 states and 82 transitions. [2023-12-02 16:28:03,674 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 2.652173913043478) internal successors, (61), 24 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:28:03,675 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 82 transitions. [2023-12-02 16:28:03,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-12-02 16:28:03,676 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:28:03,676 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:28:03,684 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 16:28:03,884 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:28:03,885 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:28:03,885 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:28:03,885 INFO L85 PathProgramCache]: Analyzing trace with hash 199244079, now seen corresponding path program 4 times [2023-12-02 16:28:03,885 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:28:03,885 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1500563210] [2023-12-02 16:28:03,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:28:03,886 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:28:03,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:28:04,813 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 7 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:28:04,813 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:28:04,813 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1500563210] [2023-12-02 16:28:04,813 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1500563210] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:28:04,814 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1362681897] [2023-12-02 16:28:04,814 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 16:28:04,814 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:28:04,814 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:28:04,815 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:28:04,824 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 16:28:04,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:28:04,904 INFO L262 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 37 conjunts are in the unsatisfiable core [2023-12-02 16:28:04,906 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:28:05,000 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-12-02 16:28:05,052 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 7 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:28:05,052 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:28:05,074 INFO L378 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 15 treesize of output 13 [2023-12-02 16:28:05,076 INFO L378 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 [2023-12-02 16:28:05,131 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 7 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:28:05,131 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1362681897] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:28:05,131 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [103936276] [2023-12-02 16:28:05,133 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-12-02 16:28:05,133 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:28:05,133 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:28:05,133 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:28:05,133 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:28:05,770 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:28:07,451 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2795#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0))' at error location [2023-12-02 16:28:07,451 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:28:07,451 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:28:07,451 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 12, 12] total 25 [2023-12-02 16:28:07,452 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [807705157] [2023-12-02 16:28:07,452 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:28:07,452 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-12-02 16:28:07,452 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:28:07,452 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-12-02 16:28:07,453 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1364, Unknown=1, NotChecked=0, Total=1482 [2023-12-02 16:28:07,453 INFO L87 Difference]: Start difference. First operand 71 states and 82 transitions. Second operand has 25 states, 25 states have (on average 1.92) internal successors, (48), 25 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) [2023-12-02 16:28:08,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:28:08,639 INFO L93 Difference]: Finished difference Result 210 states and 237 transitions. [2023-12-02 16:28:08,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2023-12-02 16:28:08,640 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.92) internal successors, (48), 25 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2023-12-02 16:28:08,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:28:08,641 INFO L225 Difference]: With dead ends: 210 [2023-12-02 16:28:08,641 INFO L226 Difference]: Without dead ends: 202 [2023-12-02 16:28:08,643 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 672 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=296, Invalid=3009, Unknown=1, NotChecked=0, Total=3306 [2023-12-02 16:28:08,643 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 208 mSDsluCounter, 168 mSDsCounter, 0 mSdLazyCounter, 808 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 208 SdHoareTripleChecker+Valid, 179 SdHoareTripleChecker+Invalid, 815 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 808 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 16:28:08,644 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [208 Valid, 179 Invalid, 815 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 808 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 16:28:08,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2023-12-02 16:28:08,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 102. [2023-12-02 16:28:08,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 100 states have (on average 1.17) internal successors, (117), 101 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:28:08,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 117 transitions. [2023-12-02 16:28:08,647 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 117 transitions. Word has length 27 [2023-12-02 16:28:08,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:28:08,647 INFO L495 AbstractCegarLoop]: Abstraction has 102 states and 117 transitions. [2023-12-02 16:28:08,647 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.92) internal successors, (48), 25 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) [2023-12-02 16:28:08,648 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 117 transitions. [2023-12-02 16:28:08,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-12-02 16:28:08,648 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:28:08,648 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:28:08,653 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-12-02 16:28:08,849 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:28:08,849 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:28:08,849 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:28:08,849 INFO L85 PathProgramCache]: Analyzing trace with hash -1407268865, now seen corresponding path program 2 times [2023-12-02 16:28:08,850 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:28:08,850 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [409641192] [2023-12-02 16:28:08,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:28:08,850 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:28:08,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:28:09,266 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:28:09,266 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:28:09,267 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [409641192] [2023-12-02 16:28:09,267 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [409641192] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:28:09,267 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1079243567] [2023-12-02 16:28:09,267 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 16:28:09,267 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:28:09,267 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:28:09,268 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:28:09,270 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 16:28:09,378 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-12-02 16:28:09,378 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:28:09,380 INFO L262 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 40 conjunts are in the unsatisfiable core [2023-12-02 16:28:09,383 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:28:09,389 INFO L378 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 [2023-12-02 16:28:09,469 INFO L378 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 13 treesize of output 9 [2023-12-02 16:28:09,493 INFO L378 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 18 treesize of output 13 [2023-12-02 16:28:09,629 INFO L349 Elim1Store]: treesize reduction 3, result has 75.0 percent of original size [2023-12-02 16:28:09,629 INFO L378 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 23 treesize of output 20 [2023-12-02 16:28:09,645 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:28:09,645 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:28:09,797 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:28:09,797 INFO L378 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 23 treesize of output 24 [2023-12-02 16:28:09,802 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:28:09,803 INFO L378 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 37 treesize of output 32 [2023-12-02 16:28:09,871 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:28:09,871 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1079243567] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:28:09,871 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [494303815] [2023-12-02 16:28:09,873 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-12-02 16:28:09,873 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:28:09,873 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:28:09,873 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:28:09,873 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:28:10,743 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:28:12,439 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3348#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= (select |#length| |ULTIMATE.start_cstrspn_~sc1~0#1.base|) |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |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_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0))' at error location [2023-12-02 16:28:12,439 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:28:12,439 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:28:12,439 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12, 12] total 26 [2023-12-02 16:28:12,440 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1915109718] [2023-12-02 16:28:12,440 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:28:12,440 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2023-12-02 16:28:12,440 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:28:12,440 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2023-12-02 16:28:12,441 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=1564, Unknown=6, NotChecked=0, Total=1722 [2023-12-02 16:28:12,441 INFO L87 Difference]: Start difference. First operand 102 states and 117 transitions. Second operand has 27 states, 27 states have (on average 2.4814814814814814) internal successors, (67), 26 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:28:12,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:28:12,704 INFO L93 Difference]: Finished difference Result 165 states and 185 transitions. [2023-12-02 16:28:12,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-12-02 16:28:12,704 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.4814814814814814) internal successors, (67), 26 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2023-12-02 16:28:12,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:28:12,705 INFO L225 Difference]: With dead ends: 165 [2023-12-02 16:28:12,705 INFO L226 Difference]: Without dead ends: 131 [2023-12-02 16:28:12,706 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 597 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=230, Invalid=2116, Unknown=6, NotChecked=0, Total=2352 [2023-12-02 16:28:12,706 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 86 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 247 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 250 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 247 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:28:12,706 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [86 Valid, 109 Invalid, 250 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 247 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:28:12,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2023-12-02 16:28:12,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 129. [2023-12-02 16:28:12,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 127 states have (on average 1.1574803149606299) internal successors, (147), 128 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:28:12,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 147 transitions. [2023-12-02 16:28:12,710 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 147 transitions. Word has length 28 [2023-12-02 16:28:12,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:28:12,710 INFO L495 AbstractCegarLoop]: Abstraction has 129 states and 147 transitions. [2023-12-02 16:28:12,710 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 2.4814814814814814) internal successors, (67), 26 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:28:12,710 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 147 transitions. [2023-12-02 16:28:12,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-12-02 16:28:12,711 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:28:12,711 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:28:12,716 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-12-02 16:28:12,911 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:28:12,912 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:28:12,912 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:28:12,912 INFO L85 PathProgramCache]: Analyzing trace with hash 629969880, now seen corresponding path program 5 times [2023-12-02 16:28:12,912 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:28:12,913 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1927968544] [2023-12-02 16:28:12,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:28:12,913 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:28:12,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:28:13,243 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 1 proven. 23 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:28:13,243 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:28:13,243 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1927968544] [2023-12-02 16:28:13,243 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1927968544] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:28:13,243 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1452491335] [2023-12-02 16:28:13,243 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 16:28:13,244 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:28:13,244 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:28:13,245 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:28:13,247 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 16:28:13,363 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-12-02 16:28:13,363 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:28:13,364 INFO L262 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 29 conjunts are in the unsatisfiable core [2023-12-02 16:28:13,367 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:28:13,371 INFO L378 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 0 case distinctions, treesize of input 8 treesize of output 1 [2023-12-02 16:28:13,565 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 20 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:28:13,565 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:28:13,924 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 20 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:28:13,924 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1452491335] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:28:13,924 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1546101632] [2023-12-02 16:28:13,926 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-12-02 16:28:13,927 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:28:13,927 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:28:13,927 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:28:13,927 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:28:14,580 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:28:16,220 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3871#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0))' at error location [2023-12-02 16:28:16,220 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:28:16,220 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:28:16,220 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 11] total 31 [2023-12-02 16:28:16,220 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [128010656] [2023-12-02 16:28:16,220 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:28:16,221 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2023-12-02 16:28:16,221 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:28:16,221 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2023-12-02 16:28:16,222 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=201, Invalid=1868, Unknown=1, NotChecked=0, Total=2070 [2023-12-02 16:28:16,222 INFO L87 Difference]: Start difference. First operand 129 states and 147 transitions. Second operand has 32 states, 31 states have (on average 2.7096774193548385) internal successors, (84), 32 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:28:16,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:28:16,708 INFO L93 Difference]: Finished difference Result 183 states and 204 transitions. [2023-12-02 16:28:16,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-12-02 16:28:16,708 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 2.7096774193548385) internal successors, (84), 32 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2023-12-02 16:28:16,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:28:16,710 INFO L225 Difference]: With dead ends: 183 [2023-12-02 16:28:16,710 INFO L226 Difference]: Without dead ends: 183 [2023-12-02 16:28:16,711 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 953 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=317, Invalid=2544, Unknown=1, NotChecked=0, Total=2862 [2023-12-02 16:28:16,712 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 277 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 501 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 277 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 502 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 501 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 16:28:16,712 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [277 Valid, 95 Invalid, 502 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 501 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 16:28:16,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2023-12-02 16:28:16,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 141. [2023-12-02 16:28:16,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 139 states have (on average 1.158273381294964) internal successors, (161), 140 states have internal predecessors, (161), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:28:16,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 161 transitions. [2023-12-02 16:28:16,717 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 161 transitions. Word has length 29 [2023-12-02 16:28:16,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:28:16,717 INFO L495 AbstractCegarLoop]: Abstraction has 141 states and 161 transitions. [2023-12-02 16:28:16,718 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 31 states have (on average 2.7096774193548385) internal successors, (84), 32 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:28:16,718 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 161 transitions. [2023-12-02 16:28:16,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-12-02 16:28:16,718 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:28:16,719 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:28:16,723 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-12-02 16:28:16,919 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2023-12-02 16:28:16,919 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:28:16,919 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:28:16,919 INFO L85 PathProgramCache]: Analyzing trace with hash -1634341701, now seen corresponding path program 3 times [2023-12-02 16:28:16,920 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:28:16,920 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1259295122] [2023-12-02 16:28:16,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:28:16,920 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:28:16,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:28:17,181 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:28:17,181 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:28:17,181 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1259295122] [2023-12-02 16:28:17,182 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1259295122] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:28:17,182 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1962230964] [2023-12-02 16:28:17,182 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 16:28:17,182 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:28:17,182 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:28:17,183 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:28:17,187 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-12-02 16:28:17,303 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 16:28:17,303 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:28:17,305 INFO L262 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 25 conjunts are in the unsatisfiable core [2023-12-02 16:28:17,307 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:28:17,462 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 14 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:28:17,462 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:28:17,646 INFO L378 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 5 treesize of output 3 [2023-12-02 16:28:17,687 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 14 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:28:17,688 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1962230964] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:28:17,688 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [139704693] [2023-12-02 16:28:17,690 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-12-02 16:28:17,690 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:28:17,690 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:28:17,691 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:28:17,691 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:28:18,647 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:28:20,201 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4419#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= (select |#length| |ULTIMATE.start_cstrspn_~sc1~0#1.base|) |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |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_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0))' at error location [2023-12-02 16:28:20,201 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:28:20,201 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:28:20,201 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 8] total 18 [2023-12-02 16:28:20,201 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [462087538] [2023-12-02 16:28:20,201 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:28:20,202 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-12-02 16:28:20,202 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:28:20,202 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-12-02 16:28:20,202 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=1053, Unknown=0, NotChecked=0, Total=1190 [2023-12-02 16:28:20,203 INFO L87 Difference]: Start difference. First operand 141 states and 161 transitions. Second operand has 20 states, 19 states have (on average 3.736842105263158) internal successors, (71), 19 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:28:20,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:28:20,465 INFO L93 Difference]: Finished difference Result 230 states and 258 transitions. [2023-12-02 16:28:20,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-12-02 16:28:20,466 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 3.736842105263158) internal successors, (71), 19 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2023-12-02 16:28:20,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:28:20,467 INFO L225 Difference]: With dead ends: 230 [2023-12-02 16:28:20,467 INFO L226 Difference]: Without dead ends: 230 [2023-12-02 16:28:20,468 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 59 SyntacticMatches, 3 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 452 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=199, Invalid=1441, Unknown=0, NotChecked=0, Total=1640 [2023-12-02 16:28:20,469 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 211 mSDsluCounter, 136 mSDsCounter, 0 mSdLazyCounter, 389 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 211 SdHoareTripleChecker+Valid, 151 SdHoareTripleChecker+Invalid, 391 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 389 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:28:20,469 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [211 Valid, 151 Invalid, 391 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 389 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 16:28:20,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2023-12-02 16:28:20,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 185. [2023-12-02 16:28:20,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 185 states, 183 states have (on average 1.1530054644808743) internal successors, (211), 184 states have internal predecessors, (211), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:28:20,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 211 transitions. [2023-12-02 16:28:20,473 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 211 transitions. Word has length 30 [2023-12-02 16:28:20,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:28:20,473 INFO L495 AbstractCegarLoop]: Abstraction has 185 states and 211 transitions. [2023-12-02 16:28:20,473 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 3.736842105263158) internal successors, (71), 19 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:28:20,474 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 211 transitions. [2023-12-02 16:28:20,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-12-02 16:28:20,474 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:28:20,474 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:28:20,479 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2023-12-02 16:28:20,674 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2023-12-02 16:28:20,675 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:28:20,675 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:28:20,675 INFO L85 PathProgramCache]: Analyzing trace with hash -1513518425, now seen corresponding path program 6 times [2023-12-02 16:28:20,675 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:28:20,675 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1245459987] [2023-12-02 16:28:20,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:28:20,675 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:28:20,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:28:21,162 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 27 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:28:21,162 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:28:21,162 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1245459987] [2023-12-02 16:28:21,162 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1245459987] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:28:21,162 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1011276893] [2023-12-02 16:28:21,163 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 16:28:21,163 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:28:21,163 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:28:21,164 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:28:21,167 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-12-02 16:28:21,295 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 16:28:21,296 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:28:21,298 INFO L262 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 41 conjunts are in the unsatisfiable core [2023-12-02 16:28:21,300 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:28:21,394 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-12-02 16:28:21,466 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 27 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:28:21,466 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:28:21,508 INFO L378 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 15 treesize of output 13 [2023-12-02 16:28:21,511 INFO L378 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 [2023-12-02 16:28:21,583 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 27 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:28:21,583 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1011276893] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:28:21,584 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1474332915] [2023-12-02 16:28:21,585 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-12-02 16:28:21,586 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:28:21,586 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:28:21,586 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:28:21,586 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:28:22,296 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:28:23,839 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5078#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0))' at error location [2023-12-02 16:28:23,839 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:28:23,839 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:28:23,839 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 25 [2023-12-02 16:28:23,839 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [111270502] [2023-12-02 16:28:23,839 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:28:23,840 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-12-02 16:28:23,840 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:28:23,840 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-12-02 16:28:23,840 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=1339, Unknown=1, NotChecked=0, Total=1482 [2023-12-02 16:28:23,841 INFO L87 Difference]: Start difference. First operand 185 states and 211 transitions. Second operand has 25 states, 25 states have (on average 2.24) internal successors, (56), 25 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:28:24,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:28:24,285 INFO L93 Difference]: Finished difference Result 295 states and 328 transitions. [2023-12-02 16:28:24,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2023-12-02 16:28:24,285 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.24) internal successors, (56), 25 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2023-12-02 16:28:24,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:28:24,287 INFO L225 Difference]: With dead ends: 295 [2023-12-02 16:28:24,287 INFO L226 Difference]: Without dead ends: 270 [2023-12-02 16:28:24,288 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 507 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=248, Invalid=2103, Unknown=1, NotChecked=0, Total=2352 [2023-12-02 16:28:24,288 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 152 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 594 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 152 SdHoareTripleChecker+Valid, 214 SdHoareTripleChecker+Invalid, 597 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 594 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 16:28:24,288 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [152 Valid, 214 Invalid, 597 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 594 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 16:28:24,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 270 states. [2023-12-02 16:28:24,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 270 to 243. [2023-12-02 16:28:24,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 243 states, 241 states have (on average 1.1493775933609958) internal successors, (277), 242 states have internal predecessors, (277), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:28:24,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 243 states to 243 states and 277 transitions. [2023-12-02 16:28:24,295 INFO L78 Accepts]: Start accepts. Automaton has 243 states and 277 transitions. Word has length 33 [2023-12-02 16:28:24,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:28:24,295 INFO L495 AbstractCegarLoop]: Abstraction has 243 states and 277 transitions. [2023-12-02 16:28:24,296 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.24) internal successors, (56), 25 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:28:24,296 INFO L276 IsEmpty]: Start isEmpty. Operand 243 states and 277 transitions. [2023-12-02 16:28:24,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2023-12-02 16:28:24,297 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:28:24,297 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:28:24,302 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2023-12-02 16:28:24,497 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2023-12-02 16:28:24,497 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:28:24,498 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:28:24,498 INFO L85 PathProgramCache]: Analyzing trace with hash -1421376880, now seen corresponding path program 7 times [2023-12-02 16:28:24,498 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:28:24,498 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1636305533] [2023-12-02 16:28:24,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:28:24,498 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:28:24,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:28:24,984 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 4 proven. 40 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:28:24,985 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:28:24,985 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1636305533] [2023-12-02 16:28:24,985 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1636305533] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:28:24,985 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [940302255] [2023-12-02 16:28:24,985 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 16:28:24,985 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:28:24,985 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:28:24,986 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:28:24,987 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-12-02 16:28:25,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:28:25,088 INFO L262 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 35 conjunts are in the unsatisfiable core [2023-12-02 16:28:25,090 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:28:25,280 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 9 proven. 35 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:28:25,280 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:28:25,482 INFO L378 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 5 treesize of output 3 [2023-12-02 16:28:25,538 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 9 proven. 35 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:28:25,538 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [940302255] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:28:25,538 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1409773159] [2023-12-02 16:28:25,540 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-12-02 16:28:25,540 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:28:25,540 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:28:25,540 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:28:25,540 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:28:26,126 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:28:27,595 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5883#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0))' at error location [2023-12-02 16:28:27,595 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:28:27,595 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:28:27,595 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 13] total 28 [2023-12-02 16:28:27,595 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1459963160] [2023-12-02 16:28:27,595 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:28:27,596 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2023-12-02 16:28:27,596 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:28:27,596 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2023-12-02 16:28:27,597 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=1635, Unknown=1, NotChecked=0, Total=1806 [2023-12-02 16:28:27,597 INFO L87 Difference]: Start difference. First operand 243 states and 277 transitions. Second operand has 29 states, 28 states have (on average 2.7857142857142856) internal successors, (78), 29 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:28:28,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:28:28,249 INFO L93 Difference]: Finished difference Result 332 states and 371 transitions. [2023-12-02 16:28:28,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-12-02 16:28:28,250 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 2.7857142857142856) internal successors, (78), 29 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2023-12-02 16:28:28,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:28:28,252 INFO L225 Difference]: With dead ends: 332 [2023-12-02 16:28:28,252 INFO L226 Difference]: Without dead ends: 332 [2023-12-02 16:28:28,253 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 69 SyntacticMatches, 5 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 925 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=283, Invalid=2368, Unknown=1, NotChecked=0, Total=2652 [2023-12-02 16:28:28,253 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 231 mSDsluCounter, 143 mSDsCounter, 0 mSdLazyCounter, 861 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 231 SdHoareTripleChecker+Valid, 158 SdHoareTripleChecker+Invalid, 862 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 861 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 16:28:28,253 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [231 Valid, 158 Invalid, 862 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 861 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 16:28:28,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 332 states. [2023-12-02 16:28:28,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 332 to 259. [2023-12-02 16:28:28,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 259 states, 257 states have (on average 1.1517509727626458) internal successors, (296), 258 states have internal predecessors, (296), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:28:28,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 296 transitions. [2023-12-02 16:28:28,259 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 296 transitions. Word has length 35 [2023-12-02 16:28:28,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:28:28,259 INFO L495 AbstractCegarLoop]: Abstraction has 259 states and 296 transitions. [2023-12-02 16:28:28,260 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 2.7857142857142856) internal successors, (78), 29 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:28:28,260 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 296 transitions. [2023-12-02 16:28:28,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-12-02 16:28:28,260 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:28:28,260 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:28:28,265 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-12-02 16:28:28,461 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2023-12-02 16:28:28,461 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:28:28,461 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:28:28,461 INFO L85 PathProgramCache]: Analyzing trace with hash -495035041, now seen corresponding path program 8 times [2023-12-02 16:28:28,461 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:28:28,461 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1998403197] [2023-12-02 16:28:28,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:28:28,462 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:28:28,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:28:28,965 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 13 proven. 48 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:28:28,965 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:28:28,965 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1998403197] [2023-12-02 16:28:28,965 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1998403197] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:28:28,965 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1138303321] [2023-12-02 16:28:28,966 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 16:28:28,966 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:28:28,966 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:28:28,967 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:28:28,969 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-12-02 16:28:29,403 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2023-12-02 16:28:29,403 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:28:29,406 INFO L262 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 44 conjunts are in the unsatisfiable core [2023-12-02 16:28:29,408 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:28:29,411 INFO L378 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 0 case distinctions, treesize of input 8 treesize of output 1 [2023-12-02 16:28:29,480 INFO L378 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 [2023-12-02 16:28:35,927 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:28:35,927 INFO L378 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 [2023-12-02 16:28:36,076 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 9 proven. 52 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:28:36,076 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:28:36,793 INFO L378 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 [2023-12-02 16:28:36,798 INFO L378 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 [2023-12-02 16:28:36,978 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 9 proven. 52 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:28:36,979 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1138303321] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:28:36,979 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1252650834] [2023-12-02 16:28:36,980 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-12-02 16:28:36,980 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:28:36,980 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:28:36,981 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:28:36,981 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:28:37,625 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:28:39,703 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6781#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0))' at error location [2023-12-02 16:28:39,703 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:28:39,703 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:28:39,703 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 47 [2023-12-02 16:28:39,703 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1737385610] [2023-12-02 16:28:39,703 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:28:39,704 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2023-12-02 16:28:39,704 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:28:39,704 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2023-12-02 16:28:39,705 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=296, Invalid=3360, Unknown=4, NotChecked=0, Total=3660 [2023-12-02 16:28:39,705 INFO L87 Difference]: Start difference. First operand 259 states and 296 transitions. Second operand has 47 states, 47 states have (on average 2.425531914893617) internal successors, (114), 47 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:28:58,578 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.17s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:29:07,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:29:07,032 INFO L93 Difference]: Finished difference Result 498 states and 550 transitions. [2023-12-02 16:29:07,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2023-12-02 16:29:07,032 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 2.425531914893617) internal successors, (114), 47 states have internal predecessors, (114), 0 states have call successors, (0), 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 [2023-12-02 16:29:07,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:29:07,035 INFO L225 Difference]: With dead ends: 498 [2023-12-02 16:29:07,035 INFO L226 Difference]: Without dead ends: 469 [2023-12-02 16:29:07,037 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1933 ImplicationChecksByTransitivity, 34.6s TimeCoverageRelationStatistics Valid=786, Invalid=6177, Unknown=9, NotChecked=0, Total=6972 [2023-12-02 16:29:07,038 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 569 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 1256 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 569 SdHoareTripleChecker+Valid, 211 SdHoareTripleChecker+Invalid, 1266 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1256 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2023-12-02 16:29:07,038 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [569 Valid, 211 Invalid, 1266 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1256 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2023-12-02 16:29:07,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 469 states. [2023-12-02 16:29:07,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 469 to 345. [2023-12-02 16:29:07,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 345 states, 343 states have (on average 1.154518950437318) internal successors, (396), 344 states have internal predecessors, (396), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:29:07,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 345 states to 345 states and 396 transitions. [2023-12-02 16:29:07,049 INFO L78 Accepts]: Start accepts. Automaton has 345 states and 396 transitions. Word has length 39 [2023-12-02 16:29:07,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:29:07,050 INFO L495 AbstractCegarLoop]: Abstraction has 345 states and 396 transitions. [2023-12-02 16:29:07,050 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 2.425531914893617) internal successors, (114), 47 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:29:07,050 INFO L276 IsEmpty]: Start isEmpty. Operand 345 states and 396 transitions. [2023-12-02 16:29:07,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-12-02 16:29:07,051 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:29:07,051 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:29:07,057 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2023-12-02 16:29:07,251 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2023-12-02 16:29:07,251 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:29:07,252 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:29:07,252 INFO L85 PathProgramCache]: Analyzing trace with hash -197352859, now seen corresponding path program 4 times [2023-12-02 16:29:07,252 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:29:07,252 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1072343742] [2023-12-02 16:29:07,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:29:07,252 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:29:07,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:29:08,799 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 3 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:29:08,799 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:29:08,799 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1072343742] [2023-12-02 16:29:08,799 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1072343742] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:29:08,800 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2124255092] [2023-12-02 16:29:08,800 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 16:29:08,800 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:29:08,800 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:29:08,801 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:29:08,801 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-12-02 16:29:08,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:29:08,887 INFO L262 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 43 conjunts are in the unsatisfiable core [2023-12-02 16:29:08,889 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:29:09,018 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-12-02 16:29:09,069 INFO L349 Elim1Store]: treesize reduction 35, result has 20.5 percent of original size [2023-12-02 16:29:09,069 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 23 [2023-12-02 16:29:15,584 INFO L349 Elim1Store]: treesize reduction 22, result has 51.1 percent of original size [2023-12-02 16:29:15,584 INFO L378 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 33 treesize of output 36 [2023-12-02 16:29:15,632 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 3 proven. 31 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:29:15,632 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:29:20,021 INFO L378 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 15 treesize of output 13 [2023-12-02 16:29:20,023 INFO L378 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 [2023-12-02 16:29:20,134 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 3 proven. 31 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:29:20,134 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2124255092] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:29:20,134 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [911439372] [2023-12-02 16:29:20,135 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-12-02 16:29:20,135 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:29:20,136 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:29:20,136 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:29:20,136 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:29:21,091 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:29:23,510 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7952#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= (select |#length| |ULTIMATE.start_cstrspn_~sc1~0#1.base|) |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |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_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0))' at error location [2023-12-02 16:29:23,510 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:29:23,510 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:29:23,510 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 14, 14] total 39 [2023-12-02 16:29:23,510 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [233074806] [2023-12-02 16:29:23,510 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:29:23,511 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2023-12-02 16:29:23,511 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:29:23,511 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2023-12-02 16:29:23,512 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=2793, Unknown=5, NotChecked=0, Total=2970 [2023-12-02 16:29:23,512 INFO L87 Difference]: Start difference. First operand 345 states and 396 transitions. Second operand has 40 states, 40 states have (on average 2.6) internal successors, (104), 39 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:29:26,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:29:26,819 INFO L93 Difference]: Finished difference Result 714 states and 788 transitions. [2023-12-02 16:29:26,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2023-12-02 16:29:26,820 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.6) internal successors, (104), 39 states have internal predecessors, (104), 0 states have call successors, (0), 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 [2023-12-02 16:29:26,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:29:26,823 INFO L225 Difference]: With dead ends: 714 [2023-12-02 16:29:26,823 INFO L226 Difference]: Without dead ends: 483 [2023-12-02 16:29:26,826 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 80 SyntacticMatches, 2 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1605 ImplicationChecksByTransitivity, 16.3s TimeCoverageRelationStatistics Valid=657, Invalid=7170, Unknown=5, NotChecked=0, Total=7832 [2023-12-02 16:29:26,827 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 366 mSDsluCounter, 265 mSDsCounter, 0 mSdLazyCounter, 1139 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 366 SdHoareTripleChecker+Valid, 277 SdHoareTripleChecker+Invalid, 1155 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 1139 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-12-02 16:29:26,827 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [366 Valid, 277 Invalid, 1155 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 1139 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-12-02 16:29:26,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 483 states. [2023-12-02 16:29:26,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 483 to 420. [2023-12-02 16:29:26,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 420 states, 418 states have (on average 1.1650717703349283) internal successors, (487), 419 states have internal predecessors, (487), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:29:26,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 420 states to 420 states and 487 transitions. [2023-12-02 16:29:26,841 INFO L78 Accepts]: Start accepts. Automaton has 420 states and 487 transitions. Word has length 39 [2023-12-02 16:29:26,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:29:26,841 INFO L495 AbstractCegarLoop]: Abstraction has 420 states and 487 transitions. [2023-12-02 16:29:26,841 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 2.6) internal successors, (104), 39 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:29:26,841 INFO L276 IsEmpty]: Start isEmpty. Operand 420 states and 487 transitions. [2023-12-02 16:29:26,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2023-12-02 16:29:26,842 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:29:26,842 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:29:26,847 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2023-12-02 16:29:27,043 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2023-12-02 16:29:27,043 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:29:27,043 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:29:27,043 INFO L85 PathProgramCache]: Analyzing trace with hash 1125937193, now seen corresponding path program 5 times [2023-12-02 16:29:27,043 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:29:27,044 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1859779562] [2023-12-02 16:29:27,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:29:27,044 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:29:27,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:29:27,345 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 1 proven. 38 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:29:27,346 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:29:27,346 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1859779562] [2023-12-02 16:29:27,346 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1859779562] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:29:27,346 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [33952975] [2023-12-02 16:29:27,346 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 16:29:27,346 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:29:27,346 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:29:27,347 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:29:27,348 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-12-02 16:29:27,646 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-12-02 16:29:27,646 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:29:27,647 INFO L262 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 28 conjunts are in the unsatisfiable core [2023-12-02 16:29:27,649 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:29:27,818 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 4 proven. 35 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:29:27,818 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:29:28,006 INFO L378 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 7 treesize of output 5 [2023-12-02 16:29:28,049 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 4 proven. 35 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:29:28,049 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [33952975] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:29:28,049 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [840886175] [2023-12-02 16:29:28,050 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-12-02 16:29:28,050 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:29:28,050 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:29:28,051 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:29:28,051 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:29:28,817 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:29:30,430 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9436#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= (select |#length| |ULTIMATE.start_cstrspn_~sc1~0#1.base|) |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |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_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0))' at error location [2023-12-02 16:29:30,430 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:29:30,430 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:29:30,431 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10, 10] total 25 [2023-12-02 16:29:30,431 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [519012407] [2023-12-02 16:29:30,431 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:29:30,431 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2023-12-02 16:29:30,431 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:29:30,432 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2023-12-02 16:29:30,432 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1538, Unknown=0, NotChecked=0, Total=1722 [2023-12-02 16:29:30,432 INFO L87 Difference]: Start difference. First operand 420 states and 487 transitions. Second operand has 27 states, 26 states have (on average 4.3076923076923075) internal successors, (112), 26 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:29:30,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:29:30,792 INFO L93 Difference]: Finished difference Result 600 states and 688 transitions. [2023-12-02 16:29:30,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-12-02 16:29:30,792 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 4.3076923076923075) internal successors, (112), 26 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2023-12-02 16:29:30,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:29:30,795 INFO L225 Difference]: With dead ends: 600 [2023-12-02 16:29:30,796 INFO L226 Difference]: Without dead ends: 600 [2023-12-02 16:29:30,796 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 86 SyntacticMatches, 4 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 766 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=274, Invalid=2078, Unknown=0, NotChecked=0, Total=2352 [2023-12-02 16:29:30,797 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 227 mSDsluCounter, 158 mSDsCounter, 0 mSdLazyCounter, 478 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 227 SdHoareTripleChecker+Valid, 176 SdHoareTripleChecker+Invalid, 479 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 478 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:29:30,797 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [227 Valid, 176 Invalid, 479 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 478 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 16:29:30,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 600 states. [2023-12-02 16:29:30,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 600 to 510. [2023-12-02 16:29:30,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 510 states, 508 states have (on average 1.1614173228346456) internal successors, (590), 509 states have internal predecessors, (590), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:29:30,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 510 states to 510 states and 590 transitions. [2023-12-02 16:29:30,808 INFO L78 Accepts]: Start accepts. Automaton has 510 states and 590 transitions. Word has length 41 [2023-12-02 16:29:30,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:29:30,808 INFO L495 AbstractCegarLoop]: Abstraction has 510 states and 590 transitions. [2023-12-02 16:29:30,808 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 4.3076923076923075) internal successors, (112), 26 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:29:30,808 INFO L276 IsEmpty]: Start isEmpty. Operand 510 states and 590 transitions. [2023-12-02 16:29:30,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2023-12-02 16:29:30,809 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:29:30,809 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:29:30,815 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2023-12-02 16:29:31,010 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:29:31,010 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:29:31,010 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:29:31,010 INFO L85 PathProgramCache]: Analyzing trace with hash -738647721, now seen corresponding path program 9 times [2023-12-02 16:29:31,010 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:29:31,010 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [212050678] [2023-12-02 16:29:31,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:29:31,011 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:29:31,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:29:31,515 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 16 proven. 75 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:29:31,515 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:29:31,515 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [212050678] [2023-12-02 16:29:31,515 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [212050678] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:29:31,515 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1293529985] [2023-12-02 16:29:31,515 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 16:29:31,515 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:29:31,515 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:29:31,516 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:29:31,517 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2023-12-02 16:29:31,635 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 16:29:31,636 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:29:31,638 INFO L262 TraceCheckSpWp]: Trace formula consists of 300 conjuncts, 53 conjunts are in the unsatisfiable core [2023-12-02 16:29:31,640 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:29:31,770 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-12-02 16:29:31,831 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 16 proven. 75 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:29:31,831 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:29:31,864 INFO L378 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 15 treesize of output 13 [2023-12-02 16:29:31,865 INFO L378 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 [2023-12-02 16:29:31,917 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 16 proven. 75 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:29:31,918 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1293529985] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:29:31,918 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [184370843] [2023-12-02 16:29:31,919 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-12-02 16:29:31,919 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:29:31,919 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:29:31,919 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:29:31,919 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:29:32,671 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:29:34,610 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10870#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0))' at error location [2023-12-02 16:29:34,610 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:29:34,611 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:29:34,611 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 31 [2023-12-02 16:29:34,611 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1995595662] [2023-12-02 16:29:34,611 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:29:34,611 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2023-12-02 16:29:34,611 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:29:34,611 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2023-12-02 16:29:34,612 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=1821, Unknown=1, NotChecked=0, Total=1980 [2023-12-02 16:29:34,612 INFO L87 Difference]: Start difference. First operand 510 states and 590 transitions. Second operand has 31 states, 31 states have (on average 2.3225806451612905) internal successors, (72), 31 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:29:35,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:29:35,406 INFO L93 Difference]: Finished difference Result 812 states and 918 transitions. [2023-12-02 16:29:35,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-12-02 16:29:35,407 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.3225806451612905) internal successors, (72), 31 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 45 [2023-12-02 16:29:35,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:29:35,410 INFO L225 Difference]: With dead ends: 812 [2023-12-02 16:29:35,410 INFO L226 Difference]: Without dead ends: 687 [2023-12-02 16:29:35,410 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 710 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=302, Invalid=3119, Unknown=1, NotChecked=0, Total=3422 [2023-12-02 16:29:35,411 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 231 mSDsluCounter, 378 mSDsCounter, 0 mSdLazyCounter, 1180 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 231 SdHoareTripleChecker+Valid, 404 SdHoareTripleChecker+Invalid, 1185 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 1180 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 16:29:35,411 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [231 Valid, 404 Invalid, 1185 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 1180 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 16:29:35,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 687 states. [2023-12-02 16:29:35,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 687 to 619. [2023-12-02 16:29:35,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 619 states, 617 states have (on average 1.1620745542949757) internal successors, (717), 618 states have internal predecessors, (717), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:29:35,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 619 states to 619 states and 717 transitions. [2023-12-02 16:29:35,423 INFO L78 Accepts]: Start accepts. Automaton has 619 states and 717 transitions. Word has length 45 [2023-12-02 16:29:35,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:29:35,423 INFO L495 AbstractCegarLoop]: Abstraction has 619 states and 717 transitions. [2023-12-02 16:29:35,423 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 2.3225806451612905) internal successors, (72), 31 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:29:35,423 INFO L276 IsEmpty]: Start isEmpty. Operand 619 states and 717 transitions. [2023-12-02 16:29:35,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2023-12-02 16:29:35,424 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:29:35,424 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:29:35,431 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2023-12-02 16:29:35,628 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:29:35,628 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:29:35,628 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:29:35,629 INFO L85 PathProgramCache]: Analyzing trace with hash 108889024, now seen corresponding path program 10 times [2023-12-02 16:29:35,629 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:29:35,629 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1705021200] [2023-12-02 16:29:35,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:29:35,629 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:29:35,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:29:36,004 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 16 proven. 86 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:29:36,005 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:29:36,005 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1705021200] [2023-12-02 16:29:36,005 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1705021200] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:29:36,005 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1796313372] [2023-12-02 16:29:36,005 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 16:29:36,005 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:29:36,005 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:29:36,006 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:29:36,006 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2023-12-02 16:29:36,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:29:36,107 INFO L262 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 45 conjunts are in the unsatisfiable core [2023-12-02 16:29:36,108 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:29:36,322 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 25 proven. 77 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:29:36,322 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:29:36,601 INFO L378 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 5 treesize of output 3 [2023-12-02 16:29:36,708 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 25 proven. 77 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:29:36,709 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1796313372] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:29:36,709 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [748563464] [2023-12-02 16:29:36,710 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-12-02 16:29:36,710 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:29:36,710 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:29:36,710 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:29:36,711 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:29:37,295 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:29:39,062 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12656#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0))' at error location [2023-12-02 16:29:39,062 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:29:39,062 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:29:39,062 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 17, 17] total 36 [2023-12-02 16:29:39,062 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [232374173] [2023-12-02 16:29:39,062 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:29:39,062 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2023-12-02 16:29:39,063 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:29:39,063 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2023-12-02 16:29:39,064 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=244, Invalid=2305, Unknown=1, NotChecked=0, Total=2550 [2023-12-02 16:29:39,064 INFO L87 Difference]: Start difference. First operand 619 states and 717 transitions. Second operand has 37 states, 36 states have (on average 2.8333333333333335) internal successors, (102), 37 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:29:40,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:29:40,027 INFO L93 Difference]: Finished difference Result 839 states and 948 transitions. [2023-12-02 16:29:40,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2023-12-02 16:29:40,028 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 36 states have (on average 2.8333333333333335) internal successors, (102), 37 states have internal predecessors, (102), 0 states have call successors, (0), 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 47 [2023-12-02 16:29:40,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:29:40,031 INFO L225 Difference]: With dead ends: 839 [2023-12-02 16:29:40,031 INFO L226 Difference]: Without dead ends: 839 [2023-12-02 16:29:40,032 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 99 SyntacticMatches, 7 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1369 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=402, Invalid=3379, Unknown=1, NotChecked=0, Total=3782 [2023-12-02 16:29:40,032 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 251 mSDsluCounter, 275 mSDsCounter, 0 mSdLazyCounter, 1493 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 251 SdHoareTripleChecker+Valid, 297 SdHoareTripleChecker+Invalid, 1494 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1493 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 16:29:40,032 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [251 Valid, 297 Invalid, 1494 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1493 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-12-02 16:29:40,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 839 states. [2023-12-02 16:29:40,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 839 to 647. [2023-12-02 16:29:40,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 647 states, 645 states have (on average 1.1643410852713179) internal successors, (751), 646 states have internal predecessors, (751), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:29:40,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 647 states to 647 states and 751 transitions. [2023-12-02 16:29:40,048 INFO L78 Accepts]: Start accepts. Automaton has 647 states and 751 transitions. Word has length 47 [2023-12-02 16:29:40,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:29:40,048 INFO L495 AbstractCegarLoop]: Abstraction has 647 states and 751 transitions. [2023-12-02 16:29:40,048 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 36 states have (on average 2.8333333333333335) internal successors, (102), 37 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:29:40,048 INFO L276 IsEmpty]: Start isEmpty. Operand 647 states and 751 transitions. [2023-12-02 16:29:40,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2023-12-02 16:29:40,050 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:29:40,050 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:29:40,056 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2023-12-02 16:29:40,256 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2023-12-02 16:29:40,256 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:29:40,257 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:29:40,257 INFO L85 PathProgramCache]: Analyzing trace with hash -1830282569, now seen corresponding path program 6 times [2023-12-02 16:29:40,257 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:29:40,257 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [684883706] [2023-12-02 16:29:40,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:29:40,257 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:29:40,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:29:40,933 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 4 proven. 63 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:29:40,933 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:29:40,934 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [684883706] [2023-12-02 16:29:40,934 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [684883706] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:29:40,934 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1832848979] [2023-12-02 16:29:40,934 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 16:29:40,934 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:29:40,934 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:29:40,935 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:29:40,936 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2023-12-02 16:29:41,083 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 16:29:41,083 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:29:41,086 INFO L262 TraceCheckSpWp]: Trace formula consists of 317 conjuncts, 81 conjunts are in the unsatisfiable core [2023-12-02 16:29:41,088 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:29:41,095 INFO L378 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 [2023-12-02 16:29:41,273 INFO L378 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 13 treesize of output 9 [2023-12-02 16:29:41,350 INFO L378 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 29 treesize of output 13 [2023-12-02 16:29:42,453 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:29:42,453 INFO L378 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 1 case distinctions, treesize of input 32 treesize of output 22 [2023-12-02 16:29:42,571 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 4 proven. 63 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:29:42,572 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:29:43,588 INFO L349 Elim1Store]: treesize reduction 14, result has 65.9 percent of original size [2023-12-02 16:29:43,589 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 355 treesize of output 270 [2023-12-02 16:29:43,599 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:29:43,599 INFO L378 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 185 treesize of output 177 [2023-12-02 16:29:43,689 INFO L349 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2023-12-02 16:29:43,689 INFO L378 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 26 treesize of output 20 [2023-12-02 16:29:43,712 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:29:43,713 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 105 treesize of output 116 [2023-12-02 16:29:43,961 INFO L378 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 15 treesize of output 11 [2023-12-02 16:29:44,286 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 4 proven. 63 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:29:44,287 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1832848979] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:29:44,287 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2111891267] [2023-12-02 16:29:44,288 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-12-02 16:29:44,289 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:29:44,289 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:29:44,289 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:29:44,289 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:29:45,039 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:29:47,774 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14525#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= (select |#length| |ULTIMATE.start_cstrspn_~sc1~0#1.base|) |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |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_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0))' at error location [2023-12-02 16:29:47,774 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:29:47,774 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:29:47,774 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 16, 17] total 52 [2023-12-02 16:29:47,775 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1210977959] [2023-12-02 16:29:47,775 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:29:47,775 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2023-12-02 16:29:47,775 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:29:47,776 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2023-12-02 16:29:47,776 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=285, Invalid=4271, Unknown=0, NotChecked=0, Total=4556 [2023-12-02 16:29:47,776 INFO L87 Difference]: Start difference. First operand 647 states and 751 transitions. Second operand has 53 states, 53 states have (on average 2.830188679245283) internal successors, (150), 52 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:29:52,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:29:52,602 INFO L93 Difference]: Finished difference Result 1561 states and 1785 transitions. [2023-12-02 16:29:52,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2023-12-02 16:29:52,603 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 2.830188679245283) internal successors, (150), 52 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2023-12-02 16:29:52,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:29:52,610 INFO L225 Difference]: With dead ends: 1561 [2023-12-02 16:29:52,610 INFO L226 Difference]: Without dead ends: 1513 [2023-12-02 16:29:52,611 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2421 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=1190, Invalid=11242, Unknown=0, NotChecked=0, Total=12432 [2023-12-02 16:29:52,612 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 798 mSDsluCounter, 367 mSDsCounter, 0 mSdLazyCounter, 1814 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 798 SdHoareTripleChecker+Valid, 381 SdHoareTripleChecker+Invalid, 1823 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 1814 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:29:52,612 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [798 Valid, 381 Invalid, 1823 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 1814 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2023-12-02 16:29:52,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1513 states. [2023-12-02 16:29:52,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1513 to 1145. [2023-12-02 16:29:52,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1145 states, 1143 states have (on average 1.1539807524059493) internal successors, (1319), 1144 states have internal predecessors, (1319), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:29:52,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1145 states to 1145 states and 1319 transitions. [2023-12-02 16:29:52,653 INFO L78 Accepts]: Start accepts. Automaton has 1145 states and 1319 transitions. Word has length 50 [2023-12-02 16:29:52,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:29:52,653 INFO L495 AbstractCegarLoop]: Abstraction has 1145 states and 1319 transitions. [2023-12-02 16:29:52,653 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 2.830188679245283) internal successors, (150), 52 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:29:52,653 INFO L276 IsEmpty]: Start isEmpty. Operand 1145 states and 1319 transitions. [2023-12-02 16:29:52,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2023-12-02 16:29:52,655 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:29:52,655 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:29:52,661 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2023-12-02 16:29:52,856 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2023-12-02 16:29:52,856 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:29:52,857 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:29:52,857 INFO L85 PathProgramCache]: Analyzing trace with hash -1016052081, now seen corresponding path program 11 times [2023-12-02 16:29:52,857 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:29:52,857 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [31987297] [2023-12-02 16:29:52,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:29:52,857 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:29:52,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:29:53,568 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 19 proven. 108 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:29:53,569 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:29:53,569 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [31987297] [2023-12-02 16:29:53,569 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [31987297] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:29:53,569 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1365438695] [2023-12-02 16:29:53,569 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 16:29:53,569 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:29:53,569 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:29:53,570 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:29:53,572 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2023-12-02 16:29:53,840 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2023-12-02 16:29:53,840 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:29:53,842 INFO L262 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 61 conjunts are in the unsatisfiable core [2023-12-02 16:29:53,844 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:29:53,983 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-12-02 16:29:54,075 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 19 proven. 108 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:29:54,075 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:29:54,126 INFO L378 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 15 treesize of output 13 [2023-12-02 16:29:54,128 INFO L378 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 [2023-12-02 16:29:54,209 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 19 proven. 108 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:29:54,209 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1365438695] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:29:54,209 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1558614645] [2023-12-02 16:29:54,210 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-12-02 16:29:54,211 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:29:54,211 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:29:54,211 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:29:54,211 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:29:54,814 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:29:56,862 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17668#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0))' at error location [2023-12-02 16:29:56,863 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:29:56,863 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:29:56,863 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 34 [2023-12-02 16:29:56,863 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [995115839] [2023-12-02 16:29:56,863 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:29:56,863 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2023-12-02 16:29:56,863 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:29:56,864 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2023-12-02 16:29:56,864 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=2089, Unknown=1, NotChecked=0, Total=2256 [2023-12-02 16:29:56,864 INFO L87 Difference]: Start difference. First operand 1145 states and 1319 transitions. Second operand has 34 states, 34 states have (on average 2.3529411764705883) internal successors, (80), 34 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:29:57,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:29:57,893 INFO L93 Difference]: Finished difference Result 1687 states and 1911 transitions. [2023-12-02 16:29:57,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2023-12-02 16:29:57,894 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.3529411764705883) internal successors, (80), 34 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2023-12-02 16:29:57,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:29:57,900 INFO L225 Difference]: With dead ends: 1687 [2023-12-02 16:29:57,900 INFO L226 Difference]: Without dead ends: 1536 [2023-12-02 16:29:57,901 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 825 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=329, Invalid=3702, Unknown=1, NotChecked=0, Total=4032 [2023-12-02 16:29:57,902 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 268 mSDsluCounter, 500 mSDsCounter, 0 mSdLazyCounter, 1618 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 268 SdHoareTripleChecker+Valid, 529 SdHoareTripleChecker+Invalid, 1624 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 1618 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 16:29:57,902 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [268 Valid, 529 Invalid, 1624 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 1618 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 16:29:57,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1536 states. [2023-12-02 16:29:57,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1536 to 1386. [2023-12-02 16:29:57,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1386 states, 1384 states have (on average 1.1560693641618498) internal successors, (1600), 1385 states have internal predecessors, (1600), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:29:57,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1386 states to 1386 states and 1600 transitions. [2023-12-02 16:29:57,933 INFO L78 Accepts]: Start accepts. Automaton has 1386 states and 1600 transitions. Word has length 51 [2023-12-02 16:29:57,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:29:57,933 INFO L495 AbstractCegarLoop]: Abstraction has 1386 states and 1600 transitions. [2023-12-02 16:29:57,933 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 2.3529411764705883) internal successors, (80), 34 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:29:57,934 INFO L276 IsEmpty]: Start isEmpty. Operand 1386 states and 1600 transitions. [2023-12-02 16:29:57,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2023-12-02 16:29:57,936 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:29:57,936 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:29:57,943 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2023-12-02 16:29:58,137 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:29:58,137 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:29:58,137 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:29:58,137 INFO L85 PathProgramCache]: Analyzing trace with hash -669944264, now seen corresponding path program 12 times [2023-12-02 16:29:58,137 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:29:58,137 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [664906431] [2023-12-02 16:29:58,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:29:58,138 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:29:58,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:29:58,790 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 25 proven. 115 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:29:58,790 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:29:58,791 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [664906431] [2023-12-02 16:29:58,791 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [664906431] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:29:58,791 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [633333511] [2023-12-02 16:29:58,791 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 16:29:58,791 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:29:58,791 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:29:58,792 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:29:58,794 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2023-12-02 16:29:58,939 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 16:29:58,939 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:29:58,942 INFO L262 TraceCheckSpWp]: Trace formula consists of 346 conjuncts, 51 conjunts are in the unsatisfiable core [2023-12-02 16:29:58,944 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:29:58,947 INFO L378 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 0 case distinctions, treesize of input 8 treesize of output 1 [2023-12-02 16:29:59,283 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 36 proven. 104 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:29:59,284 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:29:59,912 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 36 proven. 104 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:29:59,912 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [633333511] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:29:59,912 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [481601284] [2023-12-02 16:29:59,913 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-12-02 16:29:59,914 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:29:59,914 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:29:59,914 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:29:59,914 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:30:00,545 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:30:02,541 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21148#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0))' at error location [2023-12-02 16:30:02,541 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:30:02,541 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:30:02,542 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 19, 19] total 48 [2023-12-02 16:30:02,542 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1349998992] [2023-12-02 16:30:02,542 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:30:02,542 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2023-12-02 16:30:02,542 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:30:02,543 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2023-12-02 16:30:02,543 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=364, Invalid=3542, Unknown=0, NotChecked=0, Total=3906 [2023-12-02 16:30:02,543 INFO L87 Difference]: Start difference. First operand 1386 states and 1600 transitions. Second operand has 49 states, 48 states have (on average 2.7291666666666665) internal successors, (131), 49 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:30:03,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:30:03,691 INFO L93 Difference]: Finished difference Result 1755 states and 1986 transitions. [2023-12-02 16:30:03,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2023-12-02 16:30:03,692 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 48 states have (on average 2.7291666666666665) internal successors, (131), 49 states have internal predecessors, (131), 0 states have call successors, (0), 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 53 [2023-12-02 16:30:03,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:30:03,700 INFO L225 Difference]: With dead ends: 1755 [2023-12-02 16:30:03,700 INFO L226 Difference]: Without dead ends: 1755 [2023-12-02 16:30:03,700 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1873 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=558, Invalid=4992, Unknown=0, NotChecked=0, Total=5550 [2023-12-02 16:30:03,700 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 427 mSDsluCounter, 218 mSDsCounter, 0 mSdLazyCounter, 1387 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 427 SdHoareTripleChecker+Valid, 239 SdHoareTripleChecker+Invalid, 1388 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1387 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 16:30:03,701 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [427 Valid, 239 Invalid, 1388 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1387 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-12-02 16:30:03,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1755 states. [2023-12-02 16:30:03,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1755 to 1426. [2023-12-02 16:30:03,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1426 states, 1424 states have (on average 1.158005617977528) internal successors, (1649), 1425 states have internal predecessors, (1649), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:30:03,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1426 states to 1426 states and 1649 transitions. [2023-12-02 16:30:03,724 INFO L78 Accepts]: Start accepts. Automaton has 1426 states and 1649 transitions. Word has length 53 [2023-12-02 16:30:03,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:30:03,724 INFO L495 AbstractCegarLoop]: Abstraction has 1426 states and 1649 transitions. [2023-12-02 16:30:03,724 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 48 states have (on average 2.7291666666666665) internal successors, (131), 49 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:30:03,724 INFO L276 IsEmpty]: Start isEmpty. Operand 1426 states and 1649 transitions. [2023-12-02 16:30:03,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2023-12-02 16:30:03,726 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:30:03,726 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:30:03,731 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2023-12-02 16:30:03,926 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2023-12-02 16:30:03,927 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:30:03,927 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:30:03,927 INFO L85 PathProgramCache]: Analyzing trace with hash 629936125, now seen corresponding path program 1 times [2023-12-02 16:30:03,927 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:30:03,927 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [470044427] [2023-12-02 16:30:03,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:30:03,927 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:30:03,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:30:05,317 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 37 proven. 46 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 16:30:05,318 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:30:05,318 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [470044427] [2023-12-02 16:30:05,318 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [470044427] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:30:05,318 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [680091827] [2023-12-02 16:30:05,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:30:05,318 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:30:05,318 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:30:05,319 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:30:05,320 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2023-12-02 16:30:05,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:30:05,436 INFO L262 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 45 conjunts are in the unsatisfiable core [2023-12-02 16:30:05,439 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:30:05,444 INFO L378 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 [2023-12-02 16:30:05,643 INFO L378 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 13 treesize of output 9 [2023-12-02 16:30:05,683 INFO L378 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 18 treesize of output 13 [2023-12-02 16:30:05,747 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 37 proven. 42 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-12-02 16:30:05,747 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:30:05,841 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 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 15 treesize of output 13 [2023-12-02 16:30:05,843 INFO L378 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 [2023-12-02 16:30:05,960 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 37 proven. 42 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-12-02 16:30:05,961 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [680091827] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:30:05,961 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1958061514] [2023-12-02 16:30:05,962 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-12-02 16:30:05,962 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:30:05,962 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:30:05,962 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:30:05,963 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:30:07,160 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:30:09,037 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24725#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= (select |#length| |ULTIMATE.start_cstrspn_~sc1~0#1.base|) |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |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_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0))' at error location [2023-12-02 16:30:09,037 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:30:09,037 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:30:09,037 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 13, 13] total 27 [2023-12-02 16:30:09,038 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [995200728] [2023-12-02 16:30:09,038 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:30:09,038 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2023-12-02 16:30:09,038 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:30:09,038 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2023-12-02 16:30:09,039 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=1672, Unknown=0, NotChecked=0, Total=1806 [2023-12-02 16:30:09,039 INFO L87 Difference]: Start difference. First operand 1426 states and 1649 transitions. Second operand has 28 states, 28 states have (on average 2.7857142857142856) internal successors, (78), 27 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:30:10,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:30:10,432 INFO L93 Difference]: Finished difference Result 1400 states and 1614 transitions. [2023-12-02 16:30:10,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2023-12-02 16:30:10,433 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.7857142857142856) internal successors, (78), 27 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2023-12-02 16:30:10,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:30:10,437 INFO L225 Difference]: With dead ends: 1400 [2023-12-02 16:30:10,437 INFO L226 Difference]: Without dead ends: 1061 [2023-12-02 16:30:10,438 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 141 SyntacticMatches, 1 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 825 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=348, Invalid=3942, Unknown=0, NotChecked=0, Total=4290 [2023-12-02 16:30:10,438 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 281 mSDsluCounter, 315 mSDsCounter, 0 mSdLazyCounter, 905 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 281 SdHoareTripleChecker+Valid, 333 SdHoareTripleChecker+Invalid, 911 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 905 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 16:30:10,438 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [281 Valid, 333 Invalid, 911 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 905 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 16:30:10,440 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1061 states. [2023-12-02 16:30:10,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1061 to 928. [2023-12-02 16:30:10,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 928 states, 926 states have (on average 1.1587473002159827) internal successors, (1073), 927 states have internal predecessors, (1073), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:30:10,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 928 states to 928 states and 1073 transitions. [2023-12-02 16:30:10,461 INFO L78 Accepts]: Start accepts. Automaton has 928 states and 1073 transitions. Word has length 56 [2023-12-02 16:30:10,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:30:10,462 INFO L495 AbstractCegarLoop]: Abstraction has 928 states and 1073 transitions. [2023-12-02 16:30:10,462 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.7857142857142856) internal successors, (78), 27 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:30:10,462 INFO L276 IsEmpty]: Start isEmpty. Operand 928 states and 1073 transitions. [2023-12-02 16:30:10,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2023-12-02 16:30:10,464 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:30:10,464 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:30:10,469 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2023-12-02 16:30:10,664 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2023-12-02 16:30:10,664 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:30:10,665 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:30:10,665 INFO L85 PathProgramCache]: Analyzing trace with hash -329892601, now seen corresponding path program 13 times [2023-12-02 16:30:10,665 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:30:10,665 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1643377878] [2023-12-02 16:30:10,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:30:10,665 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:30:10,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:30:11,271 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 22 proven. 147 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:30:11,271 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:30:11,271 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1643377878] [2023-12-02 16:30:11,271 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1643377878] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:30:11,271 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1384760282] [2023-12-02 16:30:11,271 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 16:30:11,271 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:30:11,272 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:30:11,272 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:30:11,273 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2023-12-02 16:30:11,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:30:11,404 INFO L262 TraceCheckSpWp]: Trace formula consists of 366 conjuncts, 67 conjunts are in the unsatisfiable core [2023-12-02 16:30:11,407 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:30:11,609 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-12-02 16:30:11,699 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 22 proven. 147 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:30:11,699 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:30:11,745 INFO L378 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 15 treesize of output 13 [2023-12-02 16:30:11,747 INFO L378 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 [2023-12-02 16:30:11,824 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 22 proven. 147 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:30:11,825 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1384760282] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:30:11,825 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [866638343] [2023-12-02 16:30:11,826 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-12-02 16:30:11,826 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:30:11,826 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:30:11,826 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:30:11,826 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:30:12,397 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:30:14,407 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '27487#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0))' at error location [2023-12-02 16:30:14,408 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:30:14,408 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:30:14,408 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 37 [2023-12-02 16:30:14,408 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [82659711] [2023-12-02 16:30:14,408 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:30:14,408 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2023-12-02 16:30:14,408 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:30:14,409 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2023-12-02 16:30:14,409 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=2375, Unknown=0, NotChecked=0, Total=2550 [2023-12-02 16:30:14,409 INFO L87 Difference]: Start difference. First operand 928 states and 1073 transitions. Second operand has 37 states, 37 states have (on average 2.3783783783783785) internal successors, (88), 37 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:30:15,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:30:15,721 INFO L93 Difference]: Finished difference Result 1358 states and 1543 transitions. [2023-12-02 16:30:15,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2023-12-02 16:30:15,721 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.3783783783783785) internal successors, (88), 37 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 57 [2023-12-02 16:30:15,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:30:15,727 INFO L225 Difference]: With dead ends: 1358 [2023-12-02 16:30:15,727 INFO L226 Difference]: Without dead ends: 1193 [2023-12-02 16:30:15,727 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 953 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=357, Invalid=4335, Unknown=0, NotChecked=0, Total=4692 [2023-12-02 16:30:15,728 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 246 mSDsluCounter, 658 mSDsCounter, 0 mSdLazyCounter, 2090 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 246 SdHoareTripleChecker+Valid, 690 SdHoareTripleChecker+Invalid, 2097 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 2090 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-12-02 16:30:15,728 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [246 Valid, 690 Invalid, 2097 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 2090 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-12-02 16:30:15,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1193 states. [2023-12-02 16:30:15,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1193 to 1087. [2023-12-02 16:30:15,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1087 states, 1085 states have (on average 1.1612903225806452) internal successors, (1260), 1086 states have internal predecessors, (1260), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:30:15,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1087 states to 1087 states and 1260 transitions. [2023-12-02 16:30:15,743 INFO L78 Accepts]: Start accepts. Automaton has 1087 states and 1260 transitions. Word has length 57 [2023-12-02 16:30:15,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:30:15,744 INFO L495 AbstractCegarLoop]: Abstraction has 1087 states and 1260 transitions. [2023-12-02 16:30:15,744 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 2.3783783783783785) internal successors, (88), 37 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:30:15,744 INFO L276 IsEmpty]: Start isEmpty. Operand 1087 states and 1260 transitions. [2023-12-02 16:30:15,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2023-12-02 16:30:15,745 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:30:15,745 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:30:15,750 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2023-12-02 16:30:15,945 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2023-12-02 16:30:15,946 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:30:15,946 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:30:15,946 INFO L85 PathProgramCache]: Analyzing trace with hash -498007367, now seen corresponding path program 2 times [2023-12-02 16:30:15,946 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:30:15,946 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [902849790] [2023-12-02 16:30:15,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:30:15,946 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:30:15,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:30:16,262 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 4 proven. 82 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-12-02 16:30:16,262 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:30:16,262 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [902849790] [2023-12-02 16:30:16,262 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [902849790] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:30:16,262 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1425893729] [2023-12-02 16:30:16,262 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 16:30:16,262 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:30:16,262 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:30:16,263 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:30:16,264 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2023-12-02 16:30:16,430 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-12-02 16:30:16,430 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:30:16,433 INFO L262 TraceCheckSpWp]: Trace formula consists of 363 conjuncts, 45 conjunts are in the unsatisfiable core [2023-12-02 16:30:16,436 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:30:16,447 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-12-02 16:30:16,452 INFO L378 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 0 case distinctions, treesize of input 8 treesize of output 1 [2023-12-02 16:30:16,461 INFO L378 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 [2023-12-02 16:30:16,624 INFO L378 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 17 treesize of output 13 [2023-12-02 16:30:16,708 INFO L378 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 22 treesize of output 17 [2023-12-02 16:30:17,837 INFO L349 Elim1Store]: treesize reduction 3, result has 93.6 percent of original size [2023-12-02 16:30:17,837 INFO L378 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 36 treesize of output 57 [2023-12-02 16:30:18,025 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 30 proven. 11 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2023-12-02 16:30:18,026 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:30:18,661 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:30:18,662 INFO L378 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 66 treesize of output 44 [2023-12-02 16:30:18,688 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:30:18,688 INFO L378 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 119 treesize of output 126 [2023-12-02 16:30:18,704 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:30:18,704 INFO L378 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 72 treesize of output 66 [2023-12-02 16:30:19,043 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 4 proven. 37 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2023-12-02 16:30:19,043 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1425893729] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:30:19,044 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [826244812] [2023-12-02 16:30:19,045 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-12-02 16:30:19,045 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:30:19,045 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:30:19,045 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:30:19,045 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:30:20,065 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:30:21,992 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30355#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= (select |#length| |ULTIMATE.start_cstrspn_~sc1~0#1.base|) |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |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_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0))' at error location [2023-12-02 16:30:21,992 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:30:21,992 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:30:21,992 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 9] total 29 [2023-12-02 16:30:21,993 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [306211526] [2023-12-02 16:30:21,993 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:30:21,993 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2023-12-02 16:30:21,993 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:30:21,994 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2023-12-02 16:30:21,994 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=1897, Unknown=0, NotChecked=0, Total=2070 [2023-12-02 16:30:21,994 INFO L87 Difference]: Start difference. First operand 1087 states and 1260 transitions. Second operand has 31 states, 30 states have (on average 3.8333333333333335) internal successors, (115), 30 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) [2023-12-02 16:30:30,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:30:30,093 INFO L93 Difference]: Finished difference Result 1255 states and 1439 transitions. [2023-12-02 16:30:30,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2023-12-02 16:30:30,094 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 3.8333333333333335) internal successors, (115), 30 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 58 [2023-12-02 16:30:30,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:30:30,095 INFO L225 Difference]: With dead ends: 1255 [2023-12-02 16:30:30,095 INFO L226 Difference]: Without dead ends: 424 [2023-12-02 16:30:30,096 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2137 ImplicationChecksByTransitivity, 10.0s TimeCoverageRelationStatistics Valid=1422, Invalid=8084, Unknown=0, NotChecked=0, Total=9506 [2023-12-02 16:30:30,096 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 259 mSDsluCounter, 140 mSDsCounter, 0 mSdLazyCounter, 915 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 259 SdHoareTripleChecker+Valid, 152 SdHoareTripleChecker+Invalid, 925 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 915 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-12-02 16:30:30,096 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [259 Valid, 152 Invalid, 925 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 915 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-12-02 16:30:30,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 424 states. [2023-12-02 16:30:30,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 424 to 218. [2023-12-02 16:30:30,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 218 states, 217 states have (on average 1.1612903225806452) internal successors, (252), 217 states have internal predecessors, (252), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:30:30,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 252 transitions. [2023-12-02 16:30:30,100 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 252 transitions. Word has length 58 [2023-12-02 16:30:30,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:30:30,100 INFO L495 AbstractCegarLoop]: Abstraction has 218 states and 252 transitions. [2023-12-02 16:30:30,101 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 3.8333333333333335) internal successors, (115), 30 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) [2023-12-02 16:30:30,101 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 252 transitions. [2023-12-02 16:30:30,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2023-12-02 16:30:30,101 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:30:30,101 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:30:30,107 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2023-12-02 16:30:30,302 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2023-12-02 16:30:30,302 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:30:30,302 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:30:30,302 INFO L85 PathProgramCache]: Analyzing trace with hash 1964329456, now seen corresponding path program 14 times [2023-12-02 16:30:30,302 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:30:30,302 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1484571660] [2023-12-02 16:30:30,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:30:30,302 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:30:30,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:30:30,952 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 36 proven. 148 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:30:30,952 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:30:30,952 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1484571660] [2023-12-02 16:30:30,952 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1484571660] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:30:30,953 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2142310978] [2023-12-02 16:30:30,953 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 16:30:30,953 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:30:30,953 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:30:30,954 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:30:30,954 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2023-12-02 16:30:31,371 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2023-12-02 16:30:31,371 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:30:31,374 INFO L262 TraceCheckSpWp]: Trace formula consists of 379 conjuncts, 48 conjunts are in the unsatisfiable core [2023-12-02 16:30:31,376 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:30:31,837 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 49 proven. 135 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:30:31,837 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:30:32,250 INFO L378 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 7 treesize of output 5 [2023-12-02 16:30:32,417 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 49 proven. 135 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:30:32,417 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2142310978] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:30:32,418 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [930124647] [2023-12-02 16:30:32,419 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-12-02 16:30:32,419 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:30:32,419 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:30:32,419 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:30:32,419 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:30:33,005 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:30:34,941 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '32348#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0))' at error location [2023-12-02 16:30:34,941 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:30:34,941 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:30:34,941 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 21, 21] total 52 [2023-12-02 16:30:34,941 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2023067678] [2023-12-02 16:30:34,941 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:30:34,942 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2023-12-02 16:30:34,942 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:30:34,942 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2023-12-02 16:30:34,943 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=464, Invalid=3957, Unknown=1, NotChecked=0, Total=4422 [2023-12-02 16:30:34,943 INFO L87 Difference]: Start difference. First operand 218 states and 252 transitions. Second operand has 53 states, 52 states have (on average 2.980769230769231) internal successors, (155), 53 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:30:35,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:30:35,891 INFO L93 Difference]: Finished difference Result 358 states and 398 transitions. [2023-12-02 16:30:35,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-12-02 16:30:35,892 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 52 states have (on average 2.980769230769231) internal successors, (155), 53 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 59 [2023-12-02 16:30:35,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:30:35,893 INFO L225 Difference]: With dead ends: 358 [2023-12-02 16:30:35,893 INFO L226 Difference]: Without dead ends: 358 [2023-12-02 16:30:35,894 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 207 GetRequests, 121 SyntacticMatches, 9 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2589 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=706, Invalid=5455, Unknown=1, NotChecked=0, Total=6162 [2023-12-02 16:30:35,894 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 486 mSDsluCounter, 240 mSDsCounter, 0 mSdLazyCounter, 1186 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 486 SdHoareTripleChecker+Valid, 259 SdHoareTripleChecker+Invalid, 1187 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1186 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 16:30:35,894 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [486 Valid, 259 Invalid, 1187 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1186 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 16:30:35,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 358 states. [2023-12-02 16:30:35,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 358 to 234. [2023-12-02 16:30:35,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 234 states, 233 states have (on average 1.1630901287553648) internal successors, (271), 233 states have internal predecessors, (271), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:30:35,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 234 states to 234 states and 271 transitions. [2023-12-02 16:30:35,900 INFO L78 Accepts]: Start accepts. Automaton has 234 states and 271 transitions. Word has length 59 [2023-12-02 16:30:35,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:30:35,900 INFO L495 AbstractCegarLoop]: Abstraction has 234 states and 271 transitions. [2023-12-02 16:30:35,900 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 52 states have (on average 2.980769230769231) internal successors, (155), 53 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:30:35,900 INFO L276 IsEmpty]: Start isEmpty. Operand 234 states and 271 transitions. [2023-12-02 16:30:35,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2023-12-02 16:30:35,901 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:30:35,901 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:30:35,908 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2023-12-02 16:30:36,101 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:30:36,102 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:30:36,102 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:30:36,102 INFO L85 PathProgramCache]: Analyzing trace with hash -145132353, now seen corresponding path program 15 times [2023-12-02 16:30:36,102 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:30:36,102 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [210800874] [2023-12-02 16:30:36,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:30:36,103 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:30:36,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:30:36,781 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 25 proven. 192 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:30:36,781 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:30:36,781 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [210800874] [2023-12-02 16:30:36,781 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [210800874] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:30:36,781 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1377093360] [2023-12-02 16:30:36,781 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 16:30:36,781 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:30:36,781 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:30:36,782 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:30:36,784 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2023-12-02 16:30:37,002 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 16:30:37,002 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:30:37,006 INFO L262 TraceCheckSpWp]: Trace formula consists of 399 conjuncts, 71 conjunts are in the unsatisfiable core [2023-12-02 16:30:37,008 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:30:37,247 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-12-02 16:30:37,324 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 25 proven. 192 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:30:37,324 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:30:37,379 INFO L378 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 15 treesize of output 13 [2023-12-02 16:30:37,380 INFO L378 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 [2023-12-02 16:30:37,469 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 25 proven. 192 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:30:37,470 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1377093360] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:30:37,470 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1836553505] [2023-12-02 16:30:37,471 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-12-02 16:30:37,471 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:30:37,471 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:30:37,471 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:30:37,471 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:30:38,080 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:30:40,289 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '33390#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0))' at error location [2023-12-02 16:30:40,289 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:30:40,289 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:30:40,289 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 40 [2023-12-02 16:30:40,290 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [242682217] [2023-12-02 16:30:40,290 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:30:40,290 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2023-12-02 16:30:40,290 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:30:40,290 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2023-12-02 16:30:40,291 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=2679, Unknown=1, NotChecked=0, Total=2862 [2023-12-02 16:30:40,291 INFO L87 Difference]: Start difference. First operand 234 states and 271 transitions. Second operand has 40 states, 40 states have (on average 2.4) internal successors, (96), 40 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) [2023-12-02 16:30:41,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:30:41,554 INFO L93 Difference]: Finished difference Result 491 states and 551 transitions. [2023-12-02 16:30:41,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2023-12-02 16:30:41,554 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.4) internal successors, (96), 40 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 63 [2023-12-02 16:30:41,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:30:41,556 INFO L225 Difference]: With dead ends: 491 [2023-12-02 16:30:41,556 INFO L226 Difference]: Without dead ends: 243 [2023-12-02 16:30:41,556 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 159 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1082 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=383, Invalid=5018, Unknown=1, NotChecked=0, Total=5402 [2023-12-02 16:30:41,557 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 299 mSDsluCounter, 363 mSDsCounter, 0 mSdLazyCounter, 1829 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 299 SdHoareTripleChecker+Valid, 382 SdHoareTripleChecker+Invalid, 1837 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 1829 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 16:30:41,557 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [299 Valid, 382 Invalid, 1837 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 1829 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-12-02 16:30:41,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2023-12-02 16:30:41,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 240. [2023-12-02 16:30:41,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 240 states, 239 states have (on average 1.1589958158995817) internal successors, (277), 239 states have internal predecessors, (277), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:30:41,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 277 transitions. [2023-12-02 16:30:41,561 INFO L78 Accepts]: Start accepts. Automaton has 240 states and 277 transitions. Word has length 63 [2023-12-02 16:30:41,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:30:41,562 INFO L495 AbstractCegarLoop]: Abstraction has 240 states and 277 transitions. [2023-12-02 16:30:41,562 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 2.4) internal successors, (96), 40 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) [2023-12-02 16:30:41,562 INFO L276 IsEmpty]: Start isEmpty. Operand 240 states and 277 transitions. [2023-12-02 16:30:41,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2023-12-02 16:30:41,563 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:30:41,563 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:30:41,570 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2023-12-02 16:30:41,763 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2023-12-02 16:30:41,764 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:30:41,764 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:30:41,764 INFO L85 PathProgramCache]: Analyzing trace with hash -1523880216, now seen corresponding path program 16 times [2023-12-02 16:30:41,764 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:30:41,764 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2086852107] [2023-12-02 16:30:41,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:30:41,764 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:30:41,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:30:42,418 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 49 proven. 185 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:30:42,418 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:30:42,418 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2086852107] [2023-12-02 16:30:42,419 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2086852107] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:30:42,419 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [41807920] [2023-12-02 16:30:42,419 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 16:30:42,419 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:30:42,419 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:30:42,420 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:30:42,420 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2023-12-02 16:30:42,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:30:42,559 INFO L262 TraceCheckSpWp]: Trace formula consists of 412 conjuncts, 60 conjunts are in the unsatisfiable core [2023-12-02 16:30:42,561 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:30:42,905 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 64 proven. 170 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:30:42,905 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:30:43,332 INFO L378 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 5 treesize of output 3 [2023-12-02 16:30:43,509 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 64 proven. 170 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:30:43,510 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [41807920] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:30:43,510 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [522978354] [2023-12-02 16:30:43,511 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-12-02 16:30:43,511 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:30:43,511 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:30:43,511 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:30:43,512 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:30:44,105 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:30:46,023 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '34608#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0))' at error location [2023-12-02 16:30:46,023 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:30:46,024 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:30:46,024 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 23, 23] total 48 [2023-12-02 16:30:46,024 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1916070502] [2023-12-02 16:30:46,024 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:30:46,024 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2023-12-02 16:30:46,024 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:30:46,025 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2023-12-02 16:30:46,025 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=364, Invalid=3541, Unknown=1, NotChecked=0, Total=3906 [2023-12-02 16:30:46,025 INFO L87 Difference]: Start difference. First operand 240 states and 277 transitions. Second operand has 49 states, 48 states have (on average 2.875) internal successors, (138), 49 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:30:47,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:30:47,149 INFO L93 Difference]: Finished difference Result 392 states and 435 transitions. [2023-12-02 16:30:47,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2023-12-02 16:30:47,150 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 48 states have (on average 2.875) internal successors, (138), 49 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 65 [2023-12-02 16:30:47,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:30:47,152 INFO L225 Difference]: With dead ends: 392 [2023-12-02 16:30:47,152 INFO L226 Difference]: Without dead ends: 392 [2023-12-02 16:30:47,152 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 144 SyntacticMatches, 10 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2253 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=572, Invalid=5127, Unknown=1, NotChecked=0, Total=5700 [2023-12-02 16:30:47,152 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 544 mSDsluCounter, 343 mSDsCounter, 0 mSdLazyCounter, 1800 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 544 SdHoareTripleChecker+Valid, 365 SdHoareTripleChecker+Invalid, 1801 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1800 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-12-02 16:30:47,153 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [544 Valid, 365 Invalid, 1801 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1800 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-12-02 16:30:47,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 392 states. [2023-12-02 16:30:47,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 392 to 256. [2023-12-02 16:30:47,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 256 states, 255 states have (on average 1.1607843137254903) internal successors, (296), 255 states have internal predecessors, (296), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:30:47,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 296 transitions. [2023-12-02 16:30:47,158 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 296 transitions. Word has length 65 [2023-12-02 16:30:47,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:30:47,158 INFO L495 AbstractCegarLoop]: Abstraction has 256 states and 296 transitions. [2023-12-02 16:30:47,158 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 48 states have (on average 2.875) internal successors, (138), 49 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:30:47,158 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 296 transitions. [2023-12-02 16:30:47,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2023-12-02 16:30:47,159 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:30:47,159 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:30:47,165 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2023-12-02 16:30:47,360 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:30:47,360 INFO L420 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:30:47,360 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:30:47,360 INFO L85 PathProgramCache]: Analyzing trace with hash 895770039, now seen corresponding path program 17 times [2023-12-02 16:30:47,360 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:30:47,360 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1845712770] [2023-12-02 16:30:47,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:30:47,361 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:30:47,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:30:48,141 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 28 proven. 243 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:30:48,141 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:30:48,141 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1845712770] [2023-12-02 16:30:48,142 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1845712770] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:30:48,142 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [51677667] [2023-12-02 16:30:48,142 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 16:30:48,142 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:30:48,142 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:30:48,143 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:30:48,144 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2023-12-02 16:30:48,489 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2023-12-02 16:30:48,489 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:30:48,493 INFO L262 TraceCheckSpWp]: Trace formula consists of 432 conjuncts, 79 conjunts are in the unsatisfiable core [2023-12-02 16:30:48,496 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:30:48,741 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-12-02 16:30:48,849 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 28 proven. 243 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:30:48,849 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:30:48,907 INFO L378 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 15 treesize of output 13 [2023-12-02 16:30:48,908 INFO L378 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 [2023-12-02 16:30:48,991 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 28 proven. 243 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:30:48,991 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [51677667] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:30:48,992 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [514957773] [2023-12-02 16:30:48,993 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-12-02 16:30:48,993 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:30:48,993 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:30:48,993 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:30:48,993 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:30:49,599 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:30:51,702 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '35747#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0))' at error location [2023-12-02 16:30:51,702 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:30:51,703 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:30:51,703 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 43 [2023-12-02 16:30:51,703 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [898051907] [2023-12-02 16:30:51,703 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:30:51,703 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2023-12-02 16:30:51,703 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:30:51,704 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2023-12-02 16:30:51,704 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=191, Invalid=3001, Unknown=0, NotChecked=0, Total=3192 [2023-12-02 16:30:51,704 INFO L87 Difference]: Start difference. First operand 256 states and 296 transitions. Second operand has 43 states, 43 states have (on average 2.4186046511627906) internal successors, (104), 43 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:30:53,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:30:53,265 INFO L93 Difference]: Finished difference Result 541 states and 607 transitions. [2023-12-02 16:30:53,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2023-12-02 16:30:53,265 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.4186046511627906) internal successors, (104), 43 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2023-12-02 16:30:53,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:30:53,267 INFO L225 Difference]: With dead ends: 541 [2023-12-02 16:30:53,267 INFO L226 Difference]: Without dead ends: 265 [2023-12-02 16:30:53,267 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 176 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1228 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=411, Invalid=5751, Unknown=0, NotChecked=0, Total=6162 [2023-12-02 16:30:53,268 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 403 mSDsluCounter, 532 mSDsCounter, 0 mSdLazyCounter, 2554 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 403 SdHoareTripleChecker+Valid, 553 SdHoareTripleChecker+Invalid, 2563 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 2554 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-12-02 16:30:53,268 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [403 Valid, 553 Invalid, 2563 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 2554 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2023-12-02 16:30:53,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2023-12-02 16:30:53,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 262. [2023-12-02 16:30:53,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 261 states have (on average 1.157088122605364) internal successors, (302), 261 states have internal predecessors, (302), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:30:53,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 302 transitions. [2023-12-02 16:30:53,271 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 302 transitions. Word has length 69 [2023-12-02 16:30:53,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:30:53,271 INFO L495 AbstractCegarLoop]: Abstraction has 262 states and 302 transitions. [2023-12-02 16:30:53,271 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 2.4186046511627906) internal successors, (104), 43 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:30:53,271 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 302 transitions. [2023-12-02 16:30:53,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2023-12-02 16:30:53,272 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:30:53,272 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:30:53,278 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2023-12-02 16:30:53,473 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:30:53,473 INFO L420 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:30:53,473 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:30:53,473 INFO L85 PathProgramCache]: Analyzing trace with hash -785230560, now seen corresponding path program 18 times [2023-12-02 16:30:53,473 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:30:53,473 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1718203601] [2023-12-02 16:30:53,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:30:53,474 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:30:53,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:30:54,403 INFO L134 CoverageAnalysis]: Checked inductivity of 291 backedges. 64 proven. 226 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:30:54,404 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:30:54,404 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1718203601] [2023-12-02 16:30:54,404 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1718203601] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:30:54,404 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1647573249] [2023-12-02 16:30:54,404 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 16:30:54,404 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:30:54,404 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:30:54,405 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:30:54,406 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2023-12-02 16:30:54,622 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 16:30:54,622 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:30:54,625 INFO L262 TraceCheckSpWp]: Trace formula consists of 445 conjuncts, 66 conjunts are in the unsatisfiable core [2023-12-02 16:30:54,627 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:30:54,630 INFO L378 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 0 case distinctions, treesize of input 8 treesize of output 1 [2023-12-02 16:30:55,081 INFO L134 CoverageAnalysis]: Checked inductivity of 291 backedges. 81 proven. 209 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:30:55,081 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:30:56,019 INFO L134 CoverageAnalysis]: Checked inductivity of 291 backedges. 81 proven. 209 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:30:56,019 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1647573249] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:30:56,019 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1168816188] [2023-12-02 16:30:56,020 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-12-02 16:30:56,020 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:30:56,020 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:30:56,020 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:30:56,020 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:30:56,600 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:30:59,046 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '37092#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0))' at error location [2023-12-02 16:30:59,046 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:30:59,046 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:30:59,046 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 25, 25] total 63 [2023-12-02 16:30:59,046 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1637223937] [2023-12-02 16:30:59,047 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:30:59,047 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2023-12-02 16:30:59,047 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:30:59,048 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2023-12-02 16:30:59,048 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=579, Invalid=5426, Unknown=1, NotChecked=0, Total=6006 [2023-12-02 16:30:59,049 INFO L87 Difference]: Start difference. First operand 262 states and 302 transitions. Second operand has 64 states, 63 states have (on average 2.746031746031746) internal successors, (173), 64 states have internal predecessors, (173), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:31:00,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:31:00,635 INFO L93 Difference]: Finished difference Result 426 states and 472 transitions. [2023-12-02 16:31:00,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2023-12-02 16:31:00,636 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 63 states have (on average 2.746031746031746) internal successors, (173), 64 states have internal predecessors, (173), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 71 [2023-12-02 16:31:00,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:31:00,637 INFO L225 Difference]: With dead ends: 426 [2023-12-02 16:31:00,637 INFO L226 Difference]: Without dead ends: 426 [2023-12-02 16:31:00,638 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 159 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2926 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=835, Invalid=7536, Unknown=1, NotChecked=0, Total=8372 [2023-12-02 16:31:00,638 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 590 mSDsluCounter, 377 mSDsCounter, 0 mSdLazyCounter, 1993 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 590 SdHoareTripleChecker+Valid, 400 SdHoareTripleChecker+Invalid, 1994 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1993 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-12-02 16:31:00,639 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [590 Valid, 400 Invalid, 1994 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1993 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-12-02 16:31:00,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 426 states. [2023-12-02 16:31:00,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 426 to 278. [2023-12-02 16:31:00,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 278 states, 277 states have (on average 1.1588447653429603) internal successors, (321), 277 states have internal predecessors, (321), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:31:00,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 278 states to 278 states and 321 transitions. [2023-12-02 16:31:00,644 INFO L78 Accepts]: Start accepts. Automaton has 278 states and 321 transitions. Word has length 71 [2023-12-02 16:31:00,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:31:00,645 INFO L495 AbstractCegarLoop]: Abstraction has 278 states and 321 transitions. [2023-12-02 16:31:00,645 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 63 states have (on average 2.746031746031746) internal successors, (173), 64 states have internal predecessors, (173), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:31:00,645 INFO L276 IsEmpty]: Start isEmpty. Operand 278 states and 321 transitions. [2023-12-02 16:31:00,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2023-12-02 16:31:00,646 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:31:00,646 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 11, 11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:31:00,652 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2023-12-02 16:31:00,846 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2023-12-02 16:31:00,847 INFO L420 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:31:00,847 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:31:00,847 INFO L85 PathProgramCache]: Analyzing trace with hash -1700960273, now seen corresponding path program 19 times [2023-12-02 16:31:00,847 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:31:00,847 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1865405351] [2023-12-02 16:31:00,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:31:00,847 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:31:00,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:31:01,663 INFO L134 CoverageAnalysis]: Checked inductivity of 332 backedges. 31 proven. 300 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:31:01,663 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:31:01,663 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1865405351] [2023-12-02 16:31:01,663 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1865405351] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:31:01,663 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [410600647] [2023-12-02 16:31:01,663 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 16:31:01,663 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:31:01,664 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:31:01,664 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:31:01,665 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2023-12-02 16:31:01,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:31:01,820 INFO L262 TraceCheckSpWp]: Trace formula consists of 465 conjuncts, 85 conjunts are in the unsatisfiable core [2023-12-02 16:31:01,822 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:31:02,102 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-12-02 16:31:02,229 INFO L134 CoverageAnalysis]: Checked inductivity of 332 backedges. 31 proven. 300 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:31:02,230 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:31:02,302 INFO L378 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 15 treesize of output 13 [2023-12-02 16:31:02,304 INFO L378 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 [2023-12-02 16:31:02,425 INFO L134 CoverageAnalysis]: Checked inductivity of 332 backedges. 31 proven. 300 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:31:02,425 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [410600647] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:31:02,426 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1412324623] [2023-12-02 16:31:02,426 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-12-02 16:31:02,427 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:31:02,427 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:31:02,427 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:31:02,427 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:31:03,017 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:31:05,214 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '38328#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0))' at error location [2023-12-02 16:31:05,214 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:31:05,214 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:31:05,214 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 46 [2023-12-02 16:31:05,214 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2048331532] [2023-12-02 16:31:05,214 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:31:05,214 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2023-12-02 16:31:05,215 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:31:05,215 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2023-12-02 16:31:05,215 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=3341, Unknown=0, NotChecked=0, Total=3540 [2023-12-02 16:31:05,215 INFO L87 Difference]: Start difference. First operand 278 states and 321 transitions. Second operand has 46 states, 46 states have (on average 2.4347826086956523) internal successors, (112), 46 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:31:07,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:31:07,178 INFO L93 Difference]: Finished difference Result 591 states and 663 transitions. [2023-12-02 16:31:07,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2023-12-02 16:31:07,178 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 2.4347826086956523) internal successors, (112), 46 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 75 [2023-12-02 16:31:07,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:31:07,180 INFO L225 Difference]: With dead ends: 591 [2023-12-02 16:31:07,180 INFO L226 Difference]: Without dead ends: 287 [2023-12-02 16:31:07,181 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 193 SyntacticMatches, 0 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1379 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=438, Invalid=6534, Unknown=0, NotChecked=0, Total=6972 [2023-12-02 16:31:07,181 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 296 mSDsluCounter, 685 mSDsCounter, 0 mSdLazyCounter, 3251 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 296 SdHoareTripleChecker+Valid, 708 SdHoareTripleChecker+Invalid, 3261 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 3251 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:31:07,181 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [296 Valid, 708 Invalid, 3261 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 3251 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2023-12-02 16:31:07,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 287 states. [2023-12-02 16:31:07,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 287 to 284. [2023-12-02 16:31:07,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 284 states, 283 states have (on average 1.1554770318021201) internal successors, (327), 283 states have internal predecessors, (327), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:31:07,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 284 states to 284 states and 327 transitions. [2023-12-02 16:31:07,186 INFO L78 Accepts]: Start accepts. Automaton has 284 states and 327 transitions. Word has length 75 [2023-12-02 16:31:07,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:31:07,186 INFO L495 AbstractCegarLoop]: Abstraction has 284 states and 327 transitions. [2023-12-02 16:31:07,186 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 2.4347826086956523) internal successors, (112), 46 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:31:07,186 INFO L276 IsEmpty]: Start isEmpty. Operand 284 states and 327 transitions. [2023-12-02 16:31:07,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2023-12-02 16:31:07,187 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:31:07,187 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:31:07,192 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Ended with exit code 0 [2023-12-02 16:31:07,387 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2023-12-02 16:31:07,387 INFO L420 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:31:07,388 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:31:07,388 INFO L85 PathProgramCache]: Analyzing trace with hash 1044671640, now seen corresponding path program 20 times [2023-12-02 16:31:07,388 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:31:07,388 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [121997302] [2023-12-02 16:31:07,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:31:07,388 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:31:07,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:31:08,428 INFO L134 CoverageAnalysis]: Checked inductivity of 353 backedges. 81 proven. 271 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:31:08,428 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:31:08,428 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [121997302] [2023-12-02 16:31:08,428 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [121997302] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:31:08,429 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [418191556] [2023-12-02 16:31:08,429 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 16:31:08,429 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:31:08,429 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:31:08,430 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:31:08,431 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2023-12-02 16:31:08,827 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2023-12-02 16:31:08,828 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:31:08,832 INFO L262 TraceCheckSpWp]: Trace formula consists of 478 conjuncts, 60 conjunts are in the unsatisfiable core [2023-12-02 16:31:08,834 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:31:09,575 INFO L134 CoverageAnalysis]: Checked inductivity of 353 backedges. 100 proven. 252 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:31:09,575 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:31:10,287 INFO L378 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 7 treesize of output 5 [2023-12-02 16:31:10,557 INFO L134 CoverageAnalysis]: Checked inductivity of 353 backedges. 100 proven. 252 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:31:10,557 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [418191556] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:31:10,558 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [363874496] [2023-12-02 16:31:10,559 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-12-02 16:31:10,559 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:31:10,559 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:31:10,559 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:31:10,559 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:31:11,153 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:31:13,335 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '39789#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0))' at error location [2023-12-02 16:31:13,335 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:31:13,335 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:31:13,335 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 27, 27] total 67 [2023-12-02 16:31:13,335 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [950690058] [2023-12-02 16:31:13,335 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:31:13,336 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2023-12-02 16:31:13,336 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:31:13,337 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2023-12-02 16:31:13,337 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=734, Invalid=5907, Unknown=1, NotChecked=0, Total=6642 [2023-12-02 16:31:13,337 INFO L87 Difference]: Start difference. First operand 284 states and 327 transitions. Second operand has 68 states, 67 states have (on average 3.029850746268657) internal successors, (203), 68 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:31:14,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:31:14,759 INFO L93 Difference]: Finished difference Result 460 states and 509 transitions. [2023-12-02 16:31:14,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2023-12-02 16:31:14,760 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 67 states have (on average 3.029850746268657) internal successors, (203), 68 states have internal predecessors, (203), 0 states have call successors, (0), 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 77 [2023-12-02 16:31:14,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:31:14,761 INFO L225 Difference]: With dead ends: 460 [2023-12-02 16:31:14,762 INFO L226 Difference]: Without dead ends: 460 [2023-12-02 16:31:14,762 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 270 GetRequests, 163 SyntacticMatches, 12 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4053 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=1087, Invalid=8224, Unknown=1, NotChecked=0, Total=9312 [2023-12-02 16:31:14,763 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 520 mSDsluCounter, 281 mSDsCounter, 0 mSdLazyCounter, 1481 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 520 SdHoareTripleChecker+Valid, 306 SdHoareTripleChecker+Invalid, 1482 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1481 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-12-02 16:31:14,763 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [520 Valid, 306 Invalid, 1482 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1481 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-12-02 16:31:14,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 460 states. [2023-12-02 16:31:14,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 460 to 300. [2023-12-02 16:31:14,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 300 states, 299 states have (on average 1.157190635451505) internal successors, (346), 299 states have internal predecessors, (346), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:31:14,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 300 states to 300 states and 346 transitions. [2023-12-02 16:31:14,769 INFO L78 Accepts]: Start accepts. Automaton has 300 states and 346 transitions. Word has length 77 [2023-12-02 16:31:14,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:31:14,769 INFO L495 AbstractCegarLoop]: Abstraction has 300 states and 346 transitions. [2023-12-02 16:31:14,769 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 67 states have (on average 3.029850746268657) internal successors, (203), 68 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:31:14,769 INFO L276 IsEmpty]: Start isEmpty. Operand 300 states and 346 transitions. [2023-12-02 16:31:14,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2023-12-02 16:31:14,770 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:31:14,770 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:31:14,776 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2023-12-02 16:31:14,970 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2023-12-02 16:31:14,971 INFO L420 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:31:14,971 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:31:14,971 INFO L85 PathProgramCache]: Analyzing trace with hash 2036794215, now seen corresponding path program 21 times [2023-12-02 16:31:14,971 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:31:14,971 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [697822442] [2023-12-02 16:31:14,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:31:14,971 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:31:14,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:31:15,858 INFO L134 CoverageAnalysis]: Checked inductivity of 398 backedges. 34 proven. 363 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:31:15,858 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:31:15,858 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [697822442] [2023-12-02 16:31:15,858 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [697822442] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:31:15,859 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2105661328] [2023-12-02 16:31:15,859 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 16:31:15,859 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:31:15,859 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:31:15,860 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:31:15,860 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2023-12-02 16:31:16,059 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 16:31:16,059 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:31:16,063 INFO L262 TraceCheckSpWp]: Trace formula consists of 498 conjuncts, 89 conjunts are in the unsatisfiable core [2023-12-02 16:31:16,065 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:31:16,393 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-12-02 16:31:16,522 INFO L134 CoverageAnalysis]: Checked inductivity of 398 backedges. 34 proven. 363 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:31:16,522 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:31:16,595 INFO L378 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 15 treesize of output 13 [2023-12-02 16:31:16,597 INFO L378 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 [2023-12-02 16:31:16,703 INFO L134 CoverageAnalysis]: Checked inductivity of 398 backedges. 34 proven. 363 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:31:16,703 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2105661328] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:31:16,703 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1520934095] [2023-12-02 16:31:16,704 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-12-02 16:31:16,704 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:31:16,704 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:31:16,705 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:31:16,705 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:31:17,296 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:31:19,620 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '41122#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0))' at error location [2023-12-02 16:31:19,620 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:31:19,620 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:31:19,621 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 49 [2023-12-02 16:31:19,621 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [200180870] [2023-12-02 16:31:19,621 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:31:19,621 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2023-12-02 16:31:19,621 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:31:19,622 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2023-12-02 16:31:19,622 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=207, Invalid=3699, Unknown=0, NotChecked=0, Total=3906 [2023-12-02 16:31:19,622 INFO L87 Difference]: Start difference. First operand 300 states and 346 transitions. Second operand has 49 states, 49 states have (on average 2.4489795918367347) internal successors, (120), 49 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:31:21,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:31:21,846 INFO L93 Difference]: Finished difference Result 641 states and 719 transitions. [2023-12-02 16:31:21,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2023-12-02 16:31:21,847 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.4489795918367347) internal successors, (120), 49 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 81 [2023-12-02 16:31:21,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:31:21,848 INFO L225 Difference]: With dead ends: 641 [2023-12-02 16:31:21,848 INFO L226 Difference]: Without dead ends: 309 [2023-12-02 16:31:21,849 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 297 GetRequests, 210 SyntacticMatches, 0 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1539 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=465, Invalid=7367, Unknown=0, NotChecked=0, Total=7832 [2023-12-02 16:31:21,849 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 401 mSDsluCounter, 851 mSDsCounter, 0 mSdLazyCounter, 4023 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 401 SdHoareTripleChecker+Valid, 876 SdHoareTripleChecker+Invalid, 4034 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 4023 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2023-12-02 16:31:21,849 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [401 Valid, 876 Invalid, 4034 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 4023 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2023-12-02 16:31:21,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 309 states. [2023-12-02 16:31:21,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 309 to 306. [2023-12-02 16:31:21,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 306 states, 305 states have (on average 1.1540983606557378) internal successors, (352), 305 states have internal predecessors, (352), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:31:21,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 306 states to 306 states and 352 transitions. [2023-12-02 16:31:21,853 INFO L78 Accepts]: Start accepts. Automaton has 306 states and 352 transitions. Word has length 81 [2023-12-02 16:31:21,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:31:21,853 INFO L495 AbstractCegarLoop]: Abstraction has 306 states and 352 transitions. [2023-12-02 16:31:21,854 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 2.4489795918367347) internal successors, (120), 49 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:31:21,854 INFO L276 IsEmpty]: Start isEmpty. Operand 306 states and 352 transitions. [2023-12-02 16:31:21,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2023-12-02 16:31:21,854 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:31:21,854 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:31:21,860 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Ended with exit code 0 [2023-12-02 16:31:22,054 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:31:22,055 INFO L420 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:31:22,055 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:31:22,055 INFO L85 PathProgramCache]: Analyzing trace with hash 146285904, now seen corresponding path program 22 times [2023-12-02 16:31:22,055 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:31:22,055 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1514556204] [2023-12-02 16:31:22,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:31:22,055 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:31:22,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:31:22,977 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 100 proven. 320 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:31:22,977 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:31:22,977 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1514556204] [2023-12-02 16:31:22,977 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1514556204] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:31:22,977 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1068822459] [2023-12-02 16:31:22,978 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 16:31:22,978 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:31:22,978 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:31:22,979 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:31:22,979 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2023-12-02 16:31:23,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:31:23,135 INFO L262 TraceCheckSpWp]: Trace formula consists of 511 conjuncts, 75 conjunts are in the unsatisfiable core [2023-12-02 16:31:23,137 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:31:23,579 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 121 proven. 299 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:31:23,579 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:31:24,116 INFO L378 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 5 treesize of output 3 [2023-12-02 16:31:24,385 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 121 proven. 299 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:31:24,385 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1068822459] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:31:24,385 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [728997533] [2023-12-02 16:31:24,386 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-12-02 16:31:24,386 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:31:24,387 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:31:24,387 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:31:24,387 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:31:24,985 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:31:27,231 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '42688#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0))' at error location [2023-12-02 16:31:27,231 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:31:27,231 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:31:27,231 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 29, 29] total 60 [2023-12-02 16:31:27,232 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1290941842] [2023-12-02 16:31:27,232 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:31:27,232 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2023-12-02 16:31:27,232 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:31:27,233 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2023-12-02 16:31:27,233 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=520, Invalid=5029, Unknown=1, NotChecked=0, Total=5550 [2023-12-02 16:31:27,233 INFO L87 Difference]: Start difference. First operand 306 states and 352 transitions. Second operand has 61 states, 60 states have (on average 2.9) internal successors, (174), 61 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:31:28,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:31:28,817 INFO L93 Difference]: Finished difference Result 494 states and 546 transitions. [2023-12-02 16:31:28,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2023-12-02 16:31:28,818 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 60 states have (on average 2.9) internal successors, (174), 61 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 83 [2023-12-02 16:31:28,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:31:28,820 INFO L225 Difference]: With dead ends: 494 [2023-12-02 16:31:28,820 INFO L226 Difference]: Without dead ends: 494 [2023-12-02 16:31:28,821 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 291 GetRequests, 189 SyntacticMatches, 13 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3387 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=803, Invalid=7386, Unknown=1, NotChecked=0, Total=8190 [2023-12-02 16:31:28,821 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 660 mSDsluCounter, 466 mSDsCounter, 0 mSdLazyCounter, 2418 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 660 SdHoareTripleChecker+Valid, 494 SdHoareTripleChecker+Invalid, 2419 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 2418 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:31:28,821 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [660 Valid, 494 Invalid, 2419 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 2418 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2023-12-02 16:31:28,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 494 states. [2023-12-02 16:31:28,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 494 to 322. [2023-12-02 16:31:28,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 322 states, 321 states have (on average 1.1557632398753894) internal successors, (371), 321 states have internal predecessors, (371), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:31:28,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 322 states to 322 states and 371 transitions. [2023-12-02 16:31:28,828 INFO L78 Accepts]: Start accepts. Automaton has 322 states and 371 transitions. Word has length 83 [2023-12-02 16:31:28,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:31:28,828 INFO L495 AbstractCegarLoop]: Abstraction has 322 states and 371 transitions. [2023-12-02 16:31:28,828 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 60 states have (on average 2.9) internal successors, (174), 61 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:31:28,828 INFO L276 IsEmpty]: Start isEmpty. Operand 322 states and 371 transitions. [2023-12-02 16:31:28,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2023-12-02 16:31:28,829 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:31:28,829 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 13, 13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:31:28,834 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Ended with exit code 0 [2023-12-02 16:31:29,029 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:31:29,029 INFO L420 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:31:29,029 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:31:29,029 INFO L85 PathProgramCache]: Analyzing trace with hash -44064737, now seen corresponding path program 23 times [2023-12-02 16:31:29,030 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:31:29,030 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1929935737] [2023-12-02 16:31:29,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:31:29,030 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:31:29,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:31:30,048 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 37 proven. 432 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:31:30,048 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:31:30,048 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1929935737] [2023-12-02 16:31:30,048 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1929935737] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:31:30,048 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2007872802] [2023-12-02 16:31:30,048 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 16:31:30,048 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:31:30,048 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:31:30,049 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:31:30,050 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2023-12-02 16:31:30,790 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2023-12-02 16:31:30,790 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:31:30,795 INFO L262 TraceCheckSpWp]: Trace formula consists of 531 conjuncts, 97 conjunts are in the unsatisfiable core [2023-12-02 16:31:30,797 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:31:31,145 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-12-02 16:31:31,255 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 37 proven. 432 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:31:31,255 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:31:31,326 INFO L378 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 15 treesize of output 13 [2023-12-02 16:31:31,328 INFO L378 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 [2023-12-02 16:31:31,424 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 37 proven. 432 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:31:31,424 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2007872802] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:31:31,424 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [648540964] [2023-12-02 16:31:31,425 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-12-02 16:31:31,425 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:31:31,425 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:31:31,426 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:31:31,426 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:31:32,002 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:31:34,389 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '44118#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0))' at error location [2023-12-02 16:31:34,390 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:31:34,390 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:31:34,390 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 52 [2023-12-02 16:31:34,390 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1767421585] [2023-12-02 16:31:34,390 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:31:34,390 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2023-12-02 16:31:34,390 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:31:34,391 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2023-12-02 16:31:34,391 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=4075, Unknown=1, NotChecked=0, Total=4290 [2023-12-02 16:31:34,391 INFO L87 Difference]: Start difference. First operand 322 states and 371 transitions. Second operand has 52 states, 52 states have (on average 2.4615384615384617) internal successors, (128), 52 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:31:36,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:31:36,742 INFO L93 Difference]: Finished difference Result 691 states and 775 transitions. [2023-12-02 16:31:36,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2023-12-02 16:31:36,742 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.4615384615384617) internal successors, (128), 52 states have internal predecessors, (128), 0 states have call successors, (0), 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 87 [2023-12-02 16:31:36,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:31:36,744 INFO L225 Difference]: With dead ends: 691 [2023-12-02 16:31:36,744 INFO L226 Difference]: Without dead ends: 331 [2023-12-02 16:31:36,744 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 227 SyntacticMatches, 0 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1704 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=491, Invalid=8250, Unknown=1, NotChecked=0, Total=8742 [2023-12-02 16:31:36,745 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 338 mSDsluCounter, 793 mSDsCounter, 0 mSdLazyCounter, 3843 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 338 SdHoareTripleChecker+Valid, 820 SdHoareTripleChecker+Invalid, 3855 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 3843 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2023-12-02 16:31:36,745 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [338 Valid, 820 Invalid, 3855 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 3843 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2023-12-02 16:31:36,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 331 states. [2023-12-02 16:31:36,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 331 to 328. [2023-12-02 16:31:36,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 328 states, 327 states have (on average 1.1529051987767585) internal successors, (377), 327 states have internal predecessors, (377), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:31:36,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 328 states to 328 states and 377 transitions. [2023-12-02 16:31:36,750 INFO L78 Accepts]: Start accepts. Automaton has 328 states and 377 transitions. Word has length 87 [2023-12-02 16:31:36,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:31:36,750 INFO L495 AbstractCegarLoop]: Abstraction has 328 states and 377 transitions. [2023-12-02 16:31:36,750 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 2.4615384615384617) internal successors, (128), 52 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:31:36,750 INFO L276 IsEmpty]: Start isEmpty. Operand 328 states and 377 transitions. [2023-12-02 16:31:36,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2023-12-02 16:31:36,751 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:31:36,751 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:31:36,757 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Ended with exit code 0 [2023-12-02 16:31:36,951 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:31:36,952 INFO L420 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:31:36,952 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:31:36,952 INFO L85 PathProgramCache]: Analyzing trace with hash -551555256, now seen corresponding path program 24 times [2023-12-02 16:31:36,952 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:31:36,952 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [208322399] [2023-12-02 16:31:36,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:31:36,952 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:31:36,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:31:38,191 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 121 proven. 373 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:31:38,191 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:31:38,192 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [208322399] [2023-12-02 16:31:38,192 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [208322399] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:31:38,192 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [679960865] [2023-12-02 16:31:38,192 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 16:31:38,192 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:31:38,192 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:31:38,193 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:31:38,194 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2023-12-02 16:31:38,430 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 16:31:38,430 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:31:38,434 INFO L262 TraceCheckSpWp]: Trace formula consists of 544 conjuncts, 81 conjunts are in the unsatisfiable core [2023-12-02 16:31:38,437 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:31:38,440 INFO L378 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 0 case distinctions, treesize of input 8 treesize of output 1 [2023-12-02 16:31:39,057 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 144 proven. 350 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:31:39,057 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:31:40,503 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 144 proven. 350 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:31:40,503 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [679960865] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:31:40,503 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [354363841] [2023-12-02 16:31:40,504 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-12-02 16:31:40,504 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:31:40,504 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:31:40,504 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:31:40,504 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:31:41,069 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:31:43,548 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '45814#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0))' at error location [2023-12-02 16:31:43,549 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:31:43,549 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:31:43,549 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 31, 31] total 78 [2023-12-02 16:31:43,549 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1846798197] [2023-12-02 16:31:43,549 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:31:43,549 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2023-12-02 16:31:43,549 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:31:43,550 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2023-12-02 16:31:43,550 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=859, Invalid=7697, Unknown=0, NotChecked=0, Total=8556 [2023-12-02 16:31:43,550 INFO L87 Difference]: Start difference. First operand 328 states and 377 transitions. Second operand has 79 states, 78 states have (on average 2.7564102564102564) internal successors, (215), 79 states have internal predecessors, (215), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:31:45,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:31:45,619 INFO L93 Difference]: Finished difference Result 528 states and 583 transitions. [2023-12-02 16:31:45,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2023-12-02 16:31:45,620 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 78 states have (on average 2.7564102564102564) internal successors, (215), 79 states have internal predecessors, (215), 0 states have call successors, (0), 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 89 [2023-12-02 16:31:45,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:31:45,622 INFO L225 Difference]: With dead ends: 528 [2023-12-02 16:31:45,622 INFO L226 Difference]: Without dead ends: 528 [2023-12-02 16:31:45,623 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 312 GetRequests, 204 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4256 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=1199, Invalid=10791, Unknown=0, NotChecked=0, Total=11990 [2023-12-02 16:31:45,623 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 1078 mSDsluCounter, 504 mSDsCounter, 0 mSdLazyCounter, 2595 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1078 SdHoareTripleChecker+Valid, 533 SdHoareTripleChecker+Invalid, 2596 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 2595 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:31:45,623 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1078 Valid, 533 Invalid, 2596 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 2595 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2023-12-02 16:31:45,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 528 states. [2023-12-02 16:31:45,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 528 to 344. [2023-12-02 16:31:45,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 344 states, 343 states have (on average 1.154518950437318) internal successors, (396), 343 states have internal predecessors, (396), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:31:45,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 344 states to 344 states and 396 transitions. [2023-12-02 16:31:45,635 INFO L78 Accepts]: Start accepts. Automaton has 344 states and 396 transitions. Word has length 89 [2023-12-02 16:31:45,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:31:45,635 INFO L495 AbstractCegarLoop]: Abstraction has 344 states and 396 transitions. [2023-12-02 16:31:45,636 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 78 states have (on average 2.7564102564102564) internal successors, (215), 79 states have internal predecessors, (215), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:31:45,636 INFO L276 IsEmpty]: Start isEmpty. Operand 344 states and 396 transitions. [2023-12-02 16:31:45,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2023-12-02 16:31:45,636 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:31:45,636 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 14, 14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:31:45,642 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Ended with exit code 0 [2023-12-02 16:31:45,837 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:31:45,837 INFO L420 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:31:45,837 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:31:45,837 INFO L85 PathProgramCache]: Analyzing trace with hash 1717677591, now seen corresponding path program 25 times [2023-12-02 16:31:45,837 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:31:45,838 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [425038050] [2023-12-02 16:31:45,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:31:45,838 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:31:45,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:31:46,983 INFO L134 CoverageAnalysis]: Checked inductivity of 548 backedges. 40 proven. 507 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:31:46,983 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:31:46,983 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [425038050] [2023-12-02 16:31:46,983 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [425038050] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:31:46,983 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1567824177] [2023-12-02 16:31:46,983 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 16:31:46,983 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:31:46,983 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:31:46,984 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:31:46,989 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2023-12-02 16:31:47,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:31:47,176 INFO L262 TraceCheckSpWp]: Trace formula consists of 564 conjuncts, 103 conjunts are in the unsatisfiable core [2023-12-02 16:31:47,178 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:31:47,602 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-12-02 16:31:47,742 INFO L134 CoverageAnalysis]: Checked inductivity of 548 backedges. 40 proven. 507 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:31:47,743 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:31:47,822 INFO L378 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 15 treesize of output 13 [2023-12-02 16:31:47,824 INFO L378 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 [2023-12-02 16:31:47,917 INFO L134 CoverageAnalysis]: Checked inductivity of 548 backedges. 40 proven. 507 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:31:47,917 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1567824177] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:31:47,917 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [22497672] [2023-12-02 16:31:47,918 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-12-02 16:31:47,918 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:31:47,918 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:31:47,918 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:31:47,918 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:31:48,527 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:31:51,076 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '47341#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0))' at error location [2023-12-02 16:31:51,076 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:31:51,076 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:31:51,076 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 55 [2023-12-02 16:31:51,076 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1561329468] [2023-12-02 16:31:51,076 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:31:51,077 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2023-12-02 16:31:51,077 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:31:51,077 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2023-12-02 16:31:51,078 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=4469, Unknown=1, NotChecked=0, Total=4692 [2023-12-02 16:31:51,078 INFO L87 Difference]: Start difference. First operand 344 states and 396 transitions. Second operand has 55 states, 55 states have (on average 2.4727272727272727) internal successors, (136), 55 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:31:53,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:31:53,943 INFO L93 Difference]: Finished difference Result 741 states and 831 transitions. [2023-12-02 16:31:53,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2023-12-02 16:31:53,944 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 2.4727272727272727) internal successors, (136), 55 states have internal predecessors, (136), 0 states have call successors, (0), 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 93 [2023-12-02 16:31:53,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:31:53,945 INFO L225 Difference]: With dead ends: 741 [2023-12-02 16:31:53,945 INFO L226 Difference]: Without dead ends: 353 [2023-12-02 16:31:53,946 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 341 GetRequests, 244 SyntacticMatches, 0 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1882 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=518, Invalid=9183, Unknown=1, NotChecked=0, Total=9702 [2023-12-02 16:31:53,946 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 469 mSDsluCounter, 931 mSDsCounter, 0 mSdLazyCounter, 4489 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 469 SdHoareTripleChecker+Valid, 960 SdHoareTripleChecker+Invalid, 4502 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 4489 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2023-12-02 16:31:53,946 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [469 Valid, 960 Invalid, 4502 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 4489 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2023-12-02 16:31:53,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2023-12-02 16:31:53,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 350. [2023-12-02 16:31:53,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 350 states, 349 states have (on average 1.151862464183381) internal successors, (402), 349 states have internal predecessors, (402), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:31:53,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 350 states to 350 states and 402 transitions. [2023-12-02 16:31:53,950 INFO L78 Accepts]: Start accepts. Automaton has 350 states and 402 transitions. Word has length 93 [2023-12-02 16:31:53,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:31:53,950 INFO L495 AbstractCegarLoop]: Abstraction has 350 states and 402 transitions. [2023-12-02 16:31:53,950 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 2.4727272727272727) internal successors, (136), 55 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:31:53,950 INFO L276 IsEmpty]: Start isEmpty. Operand 350 states and 402 transitions. [2023-12-02 16:31:53,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2023-12-02 16:31:53,951 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:31:53,951 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:31:53,957 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Ended with exit code 0 [2023-12-02 16:31:54,151 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2023-12-02 16:31:54,151 INFO L420 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:31:54,152 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:31:54,152 INFO L85 PathProgramCache]: Analyzing trace with hash 2102016640, now seen corresponding path program 26 times [2023-12-02 16:31:54,152 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:31:54,152 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [872025042] [2023-12-02 16:31:54,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:31:54,152 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:31:54,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:31:55,223 INFO L134 CoverageAnalysis]: Checked inductivity of 575 backedges. 144 proven. 430 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:31:55,223 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:31:55,223 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [872025042] [2023-12-02 16:31:55,223 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [872025042] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:31:55,223 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [617546071] [2023-12-02 16:31:55,223 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 16:31:55,223 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:31:55,223 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:31:55,224 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:31:55,225 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2023-12-02 16:31:55,929 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2023-12-02 16:31:55,929 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:31:55,934 INFO L262 TraceCheckSpWp]: Trace formula consists of 577 conjuncts, 72 conjunts are in the unsatisfiable core [2023-12-02 16:31:55,943 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:31:56,853 INFO L134 CoverageAnalysis]: Checked inductivity of 575 backedges. 169 proven. 405 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:31:56,853 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:31:57,678 INFO L378 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 7 treesize of output 5 [2023-12-02 16:31:58,026 INFO L134 CoverageAnalysis]: Checked inductivity of 575 backedges. 169 proven. 405 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:31:58,027 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [617546071] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:31:58,027 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [905737589] [2023-12-02 16:31:58,028 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-12-02 16:31:58,028 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:31:58,028 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:31:58,028 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:31:58,028 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:31:58,618 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:32:01,026 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '49153#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0))' at error location [2023-12-02 16:32:01,026 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:32:01,026 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:32:01,026 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 33, 33] total 82 [2023-12-02 16:32:01,026 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1131801656] [2023-12-02 16:32:01,026 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:32:01,027 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2023-12-02 16:32:01,027 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:32:01,028 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2023-12-02 16:32:01,028 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1090, Invalid=8221, Unknown=1, NotChecked=0, Total=9312 [2023-12-02 16:32:01,029 INFO L87 Difference]: Start difference. First operand 350 states and 402 transitions. Second operand has 83 states, 82 states have (on average 3.0609756097560976) internal successors, (251), 83 states have internal predecessors, (251), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:32:02,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:32:02,566 INFO L93 Difference]: Finished difference Result 562 states and 620 transitions. [2023-12-02 16:32:02,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2023-12-02 16:32:02,567 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 82 states have (on average 3.0609756097560976) internal successors, (251), 83 states have internal predecessors, (251), 0 states have call successors, (0), 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 95 [2023-12-02 16:32:02,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:32:02,569 INFO L225 Difference]: With dead ends: 562 [2023-12-02 16:32:02,569 INFO L226 Difference]: Without dead ends: 562 [2023-12-02 16:32:02,570 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 333 GetRequests, 205 SyntacticMatches, 15 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5790 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=1572, Invalid=11537, Unknown=1, NotChecked=0, Total=13110 [2023-12-02 16:32:02,570 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 967 mSDsluCounter, 460 mSDsCounter, 0 mSdLazyCounter, 2282 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 967 SdHoareTripleChecker+Valid, 492 SdHoareTripleChecker+Invalid, 2283 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 2282 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-12-02 16:32:02,570 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [967 Valid, 492 Invalid, 2283 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 2282 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2023-12-02 16:32:02,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 562 states. [2023-12-02 16:32:02,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 562 to 366. [2023-12-02 16:32:02,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 366 states, 365 states have (on average 1.1534246575342466) internal successors, (421), 365 states have internal predecessors, (421), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:32:02,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 366 states to 366 states and 421 transitions. [2023-12-02 16:32:02,577 INFO L78 Accepts]: Start accepts. Automaton has 366 states and 421 transitions. Word has length 95 [2023-12-02 16:32:02,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:32:02,577 INFO L495 AbstractCegarLoop]: Abstraction has 366 states and 421 transitions. [2023-12-02 16:32:02,577 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 82 states have (on average 3.0609756097560976) internal successors, (251), 83 states have internal predecessors, (251), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:32:02,577 INFO L276 IsEmpty]: Start isEmpty. Operand 366 states and 421 transitions. [2023-12-02 16:32:02,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2023-12-02 16:32:02,578 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:32:02,578 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 15, 15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:32:02,584 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Ended with exit code 0 [2023-12-02 16:32:02,778 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:32:02,779 INFO L420 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:32:02,779 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:32:02,779 INFO L85 PathProgramCache]: Analyzing trace with hash 58957135, now seen corresponding path program 27 times [2023-12-02 16:32:02,779 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:32:02,779 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1583220537] [2023-12-02 16:32:02,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:32:02,779 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:32:02,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:32:04,186 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 43 proven. 588 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:32:04,186 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:32:04,187 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1583220537] [2023-12-02 16:32:04,187 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1583220537] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:32:04,187 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1165737971] [2023-12-02 16:32:04,187 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 16:32:04,187 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:32:04,187 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:32:04,188 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:32:04,189 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2023-12-02 16:32:04,499 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 16:32:04,499 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:32:04,504 INFO L262 TraceCheckSpWp]: Trace formula consists of 597 conjuncts, 146 conjunts are in the unsatisfiable core [2023-12-02 16:32:04,507 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:32:05,128 INFO L378 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 [2023-12-02 16:38:25,538 INFO L349 Elim1Store]: treesize reduction 57, result has 49.6 percent of original size [2023-12-02 16:38:25,539 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 15 select indices, 15 select index equivalence classes, 0 disjoint index pairs (out of 105 index pairs), introduced 15 new quantified variables, introduced 105 case distinctions, treesize of input 162 treesize of output 124 [2023-12-02 16:38:25,547 WARN L667 sPolynomialRelations]: Constructing 8192(two to the power of 13 dual juncts. [2023-12-02 16:38:25,939 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 66 proven. 232 refuted. 333 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:38:25,939 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:39:12,471 INFO L378 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 211 treesize of output 183 [2023-12-02 16:39:12,483 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:39:12,483 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 14 select indices, 14 select index equivalence classes, 0 disjoint index pairs (out of 91 index pairs), introduced 14 new quantified variables, introduced 91 case distinctions, treesize of input 211 treesize of output 155 [2023-12-02 16:39:15,096 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 407 proven. 224 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:39:15,096 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1165737971] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:39:15,096 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [512747921] [2023-12-02 16:39:15,097 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-12-02 16:39:15,097 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:39:15,097 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:39:15,097 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:39:15,097 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:39:15,659 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:39:20,612 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '50870#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0))' at error location [2023-12-02 16:39:20,613 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:39:20,613 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:39:20,613 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 62, 62] total 151 [2023-12-02 16:39:20,613 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1361945697] [2023-12-02 16:39:20,613 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:39:20,613 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 151 states [2023-12-02 16:39:20,613 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:39:20,614 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 151 interpolants. [2023-12-02 16:39:20,616 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2133, Invalid=24495, Unknown=432, NotChecked=0, Total=27060 [2023-12-02 16:39:20,616 INFO L87 Difference]: Start difference. First operand 366 states and 421 transitions. Second operand has 151 states, 151 states have (on average 1.8609271523178808) internal successors, (281), 151 states have internal predecessors, (281), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:39:27,827 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.59s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:39:33,397 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.52s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:39:36,406 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.19s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:39:39,889 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.37s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:39:48,959 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.50s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:39:51,039 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.17s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:39:58,025 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.34s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:40:00,186 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:40:05,049 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.83s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:40:06,603 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.55s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:40:08,631 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:40:15,056 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:40:20,561 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:40:26,202 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:40:31,557 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.94s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:40:33,460 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.87s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:40:41,659 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.42s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:40:43,403 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.74s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:40:46,569 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.78s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:40:56,149 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:41:01,640 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.87s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:41:10,774 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.82s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:41:37,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:41:37,942 INFO L93 Difference]: Finished difference Result 791 states and 887 transitions. [2023-12-02 16:41:37,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2023-12-02 16:41:37,943 INFO L78 Accepts]: Start accepts. Automaton has has 151 states, 151 states have (on average 1.8609271523178808) internal successors, (281), 151 states have internal predecessors, (281), 0 states have call successors, (0), 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 99 [2023-12-02 16:41:37,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:41:37,944 INFO L225 Difference]: With dead ends: 791 [2023-12-02 16:41:37,944 INFO L226 Difference]: Without dead ends: 375 [2023-12-02 16:41:37,946 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 404 GetRequests, 167 SyntacticMatches, 1 SemanticMatches, 236 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13692 ImplicationChecksByTransitivity, 519.6s TimeCoverageRelationStatistics Valid=6047, Invalid=49905, Unknown=454, NotChecked=0, Total=56406 [2023-12-02 16:41:37,946 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 1374 mSDsluCounter, 542 mSDsCounter, 0 mSdLazyCounter, 5631 mSolverCounterSat, 4 mSolverCounterUnsat, 20 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 49.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1374 SdHoareTripleChecker+Valid, 560 SdHoareTripleChecker+Invalid, 5655 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 5631 IncrementalHoareTripleChecker+Invalid, 20 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 50.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:41:37,946 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1374 Valid, 560 Invalid, 5655 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 5631 Invalid, 20 Unknown, 0 Unchecked, 50.1s Time] [2023-12-02 16:41:37,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 375 states. [2023-12-02 16:41:37,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 375 to 372. [2023-12-02 16:41:37,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 372 states, 371 states have (on average 1.150943396226415) internal successors, (427), 371 states have internal predecessors, (427), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:41:37,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 372 states to 372 states and 427 transitions. [2023-12-02 16:41:37,950 INFO L78 Accepts]: Start accepts. Automaton has 372 states and 427 transitions. Word has length 99 [2023-12-02 16:41:37,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:41:37,950 INFO L495 AbstractCegarLoop]: Abstraction has 372 states and 427 transitions. [2023-12-02 16:41:37,950 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 151 states, 151 states have (on average 1.8609271523178808) internal successors, (281), 151 states have internal predecessors, (281), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:41:37,951 INFO L276 IsEmpty]: Start isEmpty. Operand 372 states and 427 transitions. [2023-12-02 16:41:37,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2023-12-02 16:41:37,951 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:41:37,951 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:41:37,957 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Ended with exit code 0 [2023-12-02 16:41:38,152 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable51 [2023-12-02 16:41:38,152 INFO L420 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:41:38,152 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:41:38,152 INFO L85 PathProgramCache]: Analyzing trace with hash -415140104, now seen corresponding path program 28 times [2023-12-02 16:41:38,152 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:41:38,152 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [694941558] [2023-12-02 16:41:38,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:41:38,152 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:41:38,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:41:39,650 INFO L134 CoverageAnalysis]: Checked inductivity of 661 backedges. 169 proven. 491 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:41:39,650 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:41:39,650 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [694941558] [2023-12-02 16:41:39,650 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [694941558] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:41:39,650 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [931362116] [2023-12-02 16:41:39,650 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 16:41:39,650 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:41:39,650 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:41:39,651 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:41:39,652 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2023-12-02 16:41:39,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:41:39,825 INFO L262 TraceCheckSpWp]: Trace formula consists of 610 conjuncts, 90 conjunts are in the unsatisfiable core [2023-12-02 16:41:39,828 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:41:40,527 INFO L134 CoverageAnalysis]: Checked inductivity of 661 backedges. 196 proven. 464 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:41:40,527 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:41:41,397 INFO L378 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 5 treesize of output 3 [2023-12-02 16:41:41,835 INFO L134 CoverageAnalysis]: Checked inductivity of 661 backedges. 196 proven. 464 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:41:41,835 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [931362116] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:41:41,835 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [645868320] [2023-12-02 16:41:41,837 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-12-02 16:41:41,837 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:41:41,837 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:41:41,837 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:41:41,837 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:41:42,416 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:41:44,651 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '52866#(and (<= 2 |ULTIMATE.start_cstrspn_~s2#1.base|) (= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 2 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 2 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrspn_~s1#1.offset| 0))' at error location [2023-12-02 16:41:44,652 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:41:44,652 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:41:44,652 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 35, 35] total 72 [2023-12-02 16:41:44,652 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1804835173] [2023-12-02 16:41:44,652 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:41:44,652 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2023-12-02 16:41:44,652 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:41:44,653 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2023-12-02 16:41:44,653 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=699, Invalid=6783, Unknown=0, NotChecked=0, Total=7482 [2023-12-02 16:41:44,653 INFO L87 Difference]: Start difference. First operand 372 states and 427 transitions. Second operand has 73 states, 72 states have (on average 2.9166666666666665) internal successors, (210), 73 states have internal predecessors, (210), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:41:47,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:41:47,361 INFO L93 Difference]: Finished difference Result 596 states and 657 transitions. [2023-12-02 16:41:47,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2023-12-02 16:41:47,362 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 72 states have (on average 2.9166666666666665) internal successors, (210), 73 states have internal predecessors, (210), 0 states have call successors, (0), 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 101 [2023-12-02 16:41:47,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:41:47,364 INFO L225 Difference]: With dead ends: 596 [2023-12-02 16:41:47,364 INFO L226 Difference]: Without dead ends: 596 [2023-12-02 16:41:47,364 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 354 GetRequests, 234 SyntacticMatches, 16 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4792 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=1066, Invalid=10064, Unknown=0, NotChecked=0, Total=11130 [2023-12-02 16:41:47,365 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 852 mSDsluCounter, 811 mSDsCounter, 0 mSdLazyCounter, 3980 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 852 SdHoareTripleChecker+Valid, 844 SdHoareTripleChecker+Invalid, 3981 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 3980 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2023-12-02 16:41:47,365 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [852 Valid, 844 Invalid, 3981 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 3980 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2023-12-02 16:41:47,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 596 states. [2023-12-02 16:41:47,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 596 to 388. [2023-12-02 16:41:47,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 388 states, 387 states have (on average 1.152454780361757) internal successors, (446), 387 states have internal predecessors, (446), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:41:47,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 388 states to 388 states and 446 transitions. [2023-12-02 16:41:47,371 INFO L78 Accepts]: Start accepts. Automaton has 388 states and 446 transitions. Word has length 101 [2023-12-02 16:41:47,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:41:47,371 INFO L495 AbstractCegarLoop]: Abstraction has 388 states and 446 transitions. [2023-12-02 16:41:47,371 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 72 states have (on average 2.9166666666666665) internal successors, (210), 73 states have internal predecessors, (210), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:41:47,371 INFO L276 IsEmpty]: Start isEmpty. Operand 388 states and 446 transitions. [2023-12-02 16:41:47,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2023-12-02 16:41:47,372 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:41:47,372 INFO L195 NwaCegarLoop]: trace histogram [16, 16, 16, 16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:41:47,377 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Ended with exit code 0 [2023-12-02 16:41:47,572 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52 [2023-12-02 16:41:47,573 INFO L420 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 16:41:47,573 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:41:47,573 INFO L85 PathProgramCache]: Analyzing trace with hash -300425785, now seen corresponding path program 29 times [2023-12-02 16:41:47,573 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:41:47,573 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [222527702] [2023-12-02 16:41:47,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:41:47,573 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:41:47,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:41:48,857 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 46 proven. 675 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:41:48,858 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:41:48,858 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [222527702] [2023-12-02 16:41:48,858 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [222527702] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:41:48,858 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2027832003] [2023-12-02 16:41:48,858 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 16:41:48,858 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:41:48,858 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:41:48,859 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:41:48,860 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4324792e-3e59-48bb-9227-db8bb0f5392a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process